Changes v5->v6:
- Added a few missing conversions that weren't in my older tree, so now
this should be ready to go, as well as a couple nits people had from
v5. Barring something large and unforeseen, this is the "final
version", as this is ready to ship. Thanks to everyone who reviewed
this.
Hi folks,
This is a five part treewide cleanup of random integer handling. The
rules for random integers are:
- If you want a secure or an insecure random u64, use get_random_u64().
- If you want a secure or an insecure random u32, use get_random_u32().
* The old function prandom_u32() has been deprecated for a while now
and is just a wrapper around get_random_u32(). Same for
get_random_int().
- If you want a secure or an insecure random u16, use get_random_u16().
- If you want a secure or an insecure random u8, use get_random_u8().
- If you want secure or insecure random bytes, use get_random_bytes().
* The old function prandom_bytes() has been deprecated for a while now
and has long been a wrapper around get_random_bytes().
- If you want a non-uniform random u32, u16, or u8 bounded by a certain
open interval maximum, use prandom_u32_max().
* I say "non-uniform", because it doesn't do any rejection sampling or
divisions. Hence, it stays within the prandom_* namespace.
These rules ought to be applied uniformly, so that we can clean up the
deprecated functions, and earn the benefits of using the modern
functions. In particular, in addition to the boring substitutions, this
patchset accomplishes a few nice effects:
- By using prandom_u32_max() with an upper-bound that the compiler can
prove at compile-time is ≤65536 or ≤256, internally get_random_u16()
or get_random_u8() is used, which wastes fewer batched random bytes,
and hence has higher throughput.
- By using prandom_u32_max() instead of %, when the upper-bound is not a
constant, division is still avoided, because prandom_u32_max() uses
a faster multiplication-based trick instead.
- By using get_random_u16() or get_random_u8() in cases where the return
value is intended to indeed be a u16 or a u8, we waste fewer batched
random bytes, and hence have higher throughput.
So, based on those rules and benefits from following them, this patchset
breaks down into the following five steps:
1) Replace `prandom_u32() % max` and variants thereof with
prandom_u32_max(max).
* Part 1 is done with Coccinelle. Part 2 is done by hand.
2) Replace `(type)get_random_u32()` and variants thereof with
get_random_u16() or get_random_u8(). I took the pains to actually
look and see what every lvalue type was across the entire tree.
* Part 1 is done with Coccinelle. Part 2 is done by hand.
3) Replace remaining deprecated uses of prandom_u32() and
get_random_int() with get_random_u32().
* A boring search and replace operation.
4) Replace remaining deprecated uses of prandom_bytes() with
get_random_bytes().
* A boring search and replace operation.
5) Remove the deprecated and now-unused prandom_u32() and
prandom_bytes() inline wrapper functions.
* Just deleting code and updating comments.
I'll be sending this toward the end of the 6.1 merge window via the
random.git tree.
Please take a look! The number of lines touched is quite small, so this
should be reviewable, and as much as is possible has been pushed into
Coccinelle scripts.
Thanks,
Jason
Cc: Andreas Noever <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Shevchenko <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Christoph Böhmwalder <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Christophe Leroy <[email protected]>
Cc: Daniel Borkmann <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Eric Dumazet <[email protected]>
Cc: Florian Westphal <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>,
Cc: H. Peter Anvin <[email protected]>
Cc: Heiko Carstens <[email protected]>
Cc: Helge Deller <[email protected]>
Cc: Herbert Xu <[email protected]>
Cc: Huacai Chen <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Jakub Kicinski <[email protected]>
Cc: James E.J. Bottomley <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Johannes Berg <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Jozsef Kadlecsik <[email protected]>
Cc: KP Singh <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Marco Elver <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: Michael Ellerman <[email protected]>
Cc: Pablo Neira Ayuso <[email protected]>
Cc: Paolo Abeni <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Russell King <[email protected]>
Cc: Theodore Ts'o <[email protected]>
Cc: Thomas Bogendoerfer <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Thomas Graf <[email protected]>
Cc: Ulf Hansson <[email protected]>
Cc: Vignesh Raghavendra <[email protected]>
Cc: WANG Xuerui <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Yury Norov <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Jason A. Donenfeld (7):
treewide: use prandom_u32_max() when possible, part 1
treewide: use prandom_u32_max() when possible, part 2
treewide: use get_random_{u8,u16}() when possible, part 1
treewide: use get_random_{u8,u16}() when possible, part 2
treewide: use get_random_u32() when possible
treewide: use get_random_bytes() when possible
prandom: remove unused functions
Documentation/networking/filter.rst | 2 +-
arch/arm/kernel/process.c | 2 +-
arch/arm/kernel/signal.c | 2 +-
arch/arm64/kernel/process.c | 2 +-
arch/arm64/kernel/syscall.c | 2 +-
arch/loongarch/kernel/process.c | 2 +-
arch/loongarch/kernel/vdso.c | 2 +-
arch/mips/kernel/process.c | 2 +-
arch/mips/kernel/vdso.c | 2 +-
arch/parisc/kernel/process.c | 2 +-
arch/parisc/kernel/sys_parisc.c | 4 +-
arch/parisc/kernel/vdso.c | 2 +-
arch/powerpc/crypto/crc-vpmsum_test.c | 2 +-
arch/powerpc/kernel/process.c | 2 +-
arch/s390/kernel/process.c | 4 +-
arch/s390/kernel/vdso.c | 2 +-
arch/s390/mm/mmap.c | 2 +-
arch/sparc/vdso/vma.c | 2 +-
arch/um/kernel/process.c | 2 +-
arch/x86/entry/vdso/vma.c | 2 +-
arch/x86/kernel/cpu/amd.c | 2 +-
arch/x86/kernel/module.c | 2 +-
arch/x86/kernel/process.c | 2 +-
arch/x86/mm/pat/cpa-test.c | 4 +-
block/blk-crypto-fallback.c | 2 +-
crypto/async_tx/raid6test.c | 2 +-
crypto/testmgr.c | 94 +++++++++----------
drivers/block/drbd/drbd_receiver.c | 4 +-
drivers/char/random.c | 11 +--
drivers/dma/dmatest.c | 2 +-
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 2 +-
drivers/gpu/drm/i915/i915_gem_gtt.c | 6 +-
.../gpu/drm/i915/selftests/i915_selftest.c | 2 +-
drivers/gpu/drm/tests/drm_buddy_test.c | 2 +-
drivers/gpu/drm/tests/drm_mm_test.c | 2 +-
drivers/infiniband/core/cma.c | 2 +-
drivers/infiniband/hw/cxgb4/cm.c | 4 +-
drivers/infiniband/hw/cxgb4/id_table.c | 4 +-
drivers/infiniband/hw/hfi1/tid_rdma.c | 2 +-
drivers/infiniband/hw/hns/hns_roce_ah.c | 5 +-
drivers/infiniband/hw/mlx4/mad.c | 2 +-
drivers/infiniband/ulp/ipoib/ipoib_cm.c | 2 +-
drivers/infiniband/ulp/rtrs/rtrs-clt.c | 3 +-
drivers/md/bcache/request.c | 2 +-
drivers/md/raid5-cache.c | 2 +-
drivers/media/common/v4l2-tpg/v4l2-tpg-core.c | 2 +-
.../media/test-drivers/vivid/vivid-radio-rx.c | 4 +-
.../test-drivers/vivid/vivid-touch-cap.c | 6 +-
drivers/misc/habanalabs/gaudi2/gaudi2.c | 2 +-
drivers/mmc/core/core.c | 4 +-
drivers/mmc/host/dw_mmc.c | 2 +-
drivers/mtd/nand/raw/nandsim.c | 8 +-
drivers/mtd/tests/mtd_nandecctest.c | 12 +--
drivers/mtd/tests/speedtest.c | 2 +-
drivers/mtd/tests/stresstest.c | 19 +---
drivers/mtd/ubi/debug.c | 2 +-
drivers/mtd/ubi/debug.h | 6 +-
drivers/net/bonding/bond_main.c | 2 +-
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
drivers/net/ethernet/broadcom/cnic.c | 5 +-
.../chelsio/inline_crypto/chtls/chtls_cm.c | 4 +-
.../chelsio/inline_crypto/chtls/chtls_io.c | 4 +-
drivers/net/ethernet/rocker/rocker_main.c | 8 +-
drivers/net/hamradio/baycom_epp.c | 2 +-
drivers/net/hamradio/hdlcdrv.c | 2 +-
drivers/net/hamradio/yam.c | 2 +-
drivers/net/phy/at803x.c | 2 +-
drivers/net/wireguard/selftest/allowedips.c | 16 ++--
.../broadcom/brcm80211/brcmfmac/p2p.c | 2 +-
.../broadcom/brcm80211/brcmfmac/pno.c | 2 +-
.../net/wireless/intel/iwlwifi/mvm/mac-ctxt.c | 2 +-
.../net/wireless/marvell/mwifiex/cfg80211.c | 4 +-
.../wireless/microchip/wilc1000/cfg80211.c | 2 +-
.../net/wireless/quantenna/qtnfmac/cfg80211.c | 2 +-
drivers/net/wireless/st/cw1200/wsm.c | 2 +-
drivers/net/wireless/ti/wlcore/main.c | 2 +-
drivers/nvme/common/auth.c | 2 +-
drivers/scsi/cxgbi/cxgb4i/cxgb4i.c | 4 +-
drivers/scsi/fcoe/fcoe_ctlr.c | 4 +-
drivers/scsi/lpfc/lpfc_hbadisc.c | 6 +-
drivers/scsi/qedi/qedi_main.c | 2 +-
drivers/target/iscsi/cxgbit/cxgbit_cm.c | 2 +-
drivers/thunderbolt/xdomain.c | 2 +-
drivers/video/fbdev/uvesafb.c | 2 +-
fs/ceph/inode.c | 2 +-
fs/ceph/mdsmap.c | 2 +-
fs/exfat/inode.c | 2 +-
fs/ext2/ialloc.c | 3 +-
fs/ext4/ialloc.c | 7 +-
fs/ext4/ioctl.c | 4 +-
fs/ext4/mmp.c | 2 +-
fs/ext4/super.c | 7 +-
fs/f2fs/gc.c | 2 +-
fs/f2fs/namei.c | 2 +-
fs/f2fs/segment.c | 8 +-
fs/fat/inode.c | 2 +-
fs/nfsd/nfs4state.c | 4 +-
fs/ntfs3/fslog.c | 6 +-
fs/ubifs/debug.c | 10 +-
fs/ubifs/journal.c | 2 +-
fs/ubifs/lpt_commit.c | 14 +--
fs/ubifs/tnc_commit.c | 2 +-
fs/xfs/libxfs/xfs_alloc.c | 2 +-
fs/xfs/libxfs/xfs_ialloc.c | 4 +-
fs/xfs/xfs_error.c | 2 +-
fs/xfs/xfs_icache.c | 2 +-
fs/xfs/xfs_log.c | 2 +-
include/linux/nodemask.h | 2 +-
include/linux/prandom.h | 12 ---
include/linux/random.h | 5 -
include/net/netfilter/nf_queue.h | 2 +-
include/net/red.h | 2 +-
include/net/sock.h | 2 +-
kernel/bpf/bloom_filter.c | 2 +-
kernel/bpf/core.c | 6 +-
kernel/bpf/hashtab.c | 2 +-
kernel/bpf/verifier.c | 2 +-
kernel/kcsan/selftest.c | 4 +-
kernel/locking/test-ww_mutex.c | 4 +-
kernel/time/clocksource.c | 2 +-
lib/cmdline_kunit.c | 4 +-
lib/fault-inject.c | 2 +-
lib/find_bit_benchmark.c | 4 +-
lib/kobject.c | 2 +-
lib/random32.c | 4 +-
lib/reed_solomon/test_rslib.c | 12 +--
lib/sbitmap.c | 4 +-
lib/test-string_helpers.c | 2 +-
lib/test_fprobe.c | 2 +-
lib/test_hexdump.c | 10 +-
lib/test_kasan.c | 6 +-
lib/test_kprobes.c | 2 +-
lib/test_list_sort.c | 2 +-
lib/test_min_heap.c | 6 +-
lib/test_objagg.c | 2 +-
lib/test_rhashtable.c | 6 +-
lib/test_vmalloc.c | 19 +---
lib/uuid.c | 2 +-
mm/migrate.c | 2 +-
mm/shmem.c | 2 +-
mm/slab.c | 2 +-
mm/slub.c | 2 +-
net/802/garp.c | 2 +-
net/802/mrp.c | 2 +-
net/ceph/mon_client.c | 2 +-
net/ceph/osd_client.c | 2 +-
net/core/neighbour.c | 2 +-
net/core/pktgen.c | 47 +++++-----
net/core/stream.c | 2 +-
net/dccp/ipv4.c | 4 +-
net/ipv4/datagram.c | 2 +-
net/ipv4/igmp.c | 6 +-
net/ipv4/inet_connection_sock.c | 2 +-
net/ipv4/inet_hashtables.c | 2 +-
net/ipv4/ip_output.c | 2 +-
net/ipv4/route.c | 4 +-
net/ipv4/tcp_cdg.c | 2 +-
net/ipv4/tcp_ipv4.c | 4 +-
net/ipv4/udp.c | 2 +-
net/ipv6/addrconf.c | 8 +-
net/ipv6/ip6_flowlabel.c | 2 +-
net/ipv6/mcast.c | 10 +-
net/ipv6/output_core.c | 2 +-
net/mac80211/rc80211_minstrel_ht.c | 2 +-
net/mac80211/scan.c | 2 +-
net/netfilter/ipvs/ip_vs_conn.c | 2 +-
net/netfilter/ipvs/ip_vs_twos.c | 4 +-
net/netfilter/nf_nat_core.c | 4 +-
net/netfilter/xt_statistic.c | 2 +-
net/openvswitch/actions.c | 2 +-
net/packet/af_packet.c | 2 +-
net/rds/bind.c | 2 +-
net/sched/act_gact.c | 2 +-
net/sched/act_sample.c | 2 +-
net/sched/sch_cake.c | 8 +-
net/sched/sch_netem.c | 22 ++---
net/sched/sch_pie.c | 2 +-
net/sched/sch_sfb.c | 2 +-
net/sctp/socket.c | 4 +-
net/sunrpc/auth_gss/gss_krb5_wrap.c | 4 +-
net/sunrpc/cache.c | 2 +-
net/sunrpc/xprt.c | 2 +-
net/sunrpc/xprtsock.c | 2 +-
net/tipc/socket.c | 2 +-
net/unix/af_unix.c | 2 +-
net/xfrm/xfrm_state.c | 2 +-
186 files changed, 379 insertions(+), 422 deletions(-)
--
2.37.3
Rather than incurring a division or requesting too many random bytes for
the given range, use the prandom_u32_max() function, which only takes
the minimum required bytes from the RNG and avoids divisions. This was
done mechanically with this coccinelle script:
@basic@
expression E;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u64;
@@
(
- ((T)get_random_u32() % (E))
+ prandom_u32_max(E)
|
- ((T)get_random_u32() & ((E) - 1))
+ prandom_u32_max(E * XXX_MAKE_SURE_E_IS_POW2)
|
- ((u64)(E) * get_random_u32() >> 32)
+ prandom_u32_max(E)
|
- ((T)get_random_u32() & ~PAGE_MASK)
+ prandom_u32_max(PAGE_SIZE)
)
@multi_line@
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
identifier RAND;
expression E;
@@
- RAND = get_random_u32();
... when != RAND
- RAND %= (E);
+ RAND = prandom_u32_max(E);
// Find a potential literal
@literal_mask@
expression LITERAL;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
position p;
@@
((T)get_random_u32()@p & (LITERAL))
// Add one to the literal.
@script:python add_one@
literal << literal_mask.LITERAL;
RESULT;
@@
value = None
if literal.startswith('0x'):
value = int(literal, 16)
elif literal[0] in '123456789':
value = int(literal, 10)
if value is None:
print("I don't know how to handle %s" % (literal))
cocci.include_match(False)
elif value == 2**32 - 1 or value == 2**31 - 1 or value == 2**24 - 1 or value == 2**16 - 1 or value == 2**8 - 1:
print("Skipping 0x%x for cleanup elsewhere" % (value))
cocci.include_match(False)
elif value & (value + 1) != 0:
print("Skipping 0x%x because it's not a power of two minus one" % (value))
cocci.include_match(False)
elif literal.startswith('0x'):
coccinelle.RESULT = cocci.make_expr("0x%x" % (value + 1))
else:
coccinelle.RESULT = cocci.make_expr("%d" % (value + 1))
// Replace the literal mask with the calculated result.
@plus_one@
expression literal_mask.LITERAL;
position literal_mask.p;
expression add_one.RESULT;
identifier FUNC;
@@
- (FUNC()@p & (LITERAL))
+ prandom_u32_max(RESULT)
@collapse_ret@
type T;
identifier VAR;
expression E;
@@
{
- T VAR;
- VAR = (E);
- return VAR;
+ return E;
}
@drop_var@
type T;
identifier VAR;
@@
{
- T VAR;
... when != VAR
}
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Yury Norov <[email protected]>
Reviewed-by: KP Singh <[email protected]>
Reviewed-by: Jan Kara <[email protected]> # for ext4 and sbitmap
Reviewed-by: Christoph Böhmwalder <[email protected]> # for drbd
Acked-by: Ulf Hansson <[email protected]> # for mmc
Acked-by: Darrick J. Wong <[email protected]> # for xfs
Signed-off-by: Jason A. Donenfeld <[email protected]>
---
arch/arm/kernel/process.c | 2 +-
arch/arm64/kernel/process.c | 2 +-
arch/loongarch/kernel/process.c | 2 +-
arch/loongarch/kernel/vdso.c | 2 +-
arch/mips/kernel/process.c | 2 +-
arch/mips/kernel/vdso.c | 2 +-
arch/parisc/kernel/vdso.c | 2 +-
arch/powerpc/kernel/process.c | 2 +-
arch/s390/kernel/process.c | 2 +-
arch/s390/kernel/vdso.c | 2 +-
arch/sparc/vdso/vma.c | 2 +-
arch/um/kernel/process.c | 2 +-
arch/x86/entry/vdso/vma.c | 2 +-
arch/x86/kernel/module.c | 2 +-
arch/x86/kernel/process.c | 2 +-
arch/x86/mm/pat/cpa-test.c | 4 +-
crypto/testmgr.c | 86 +++++++++----------
drivers/block/drbd/drbd_receiver.c | 4 +-
.../gpu/drm/i915/gem/i915_gem_execbuffer.c | 2 +-
drivers/infiniband/core/cma.c | 2 +-
drivers/infiniband/hw/cxgb4/id_table.c | 4 +-
drivers/infiniband/hw/hns/hns_roce_ah.c | 5 +-
drivers/infiniband/ulp/rtrs/rtrs-clt.c | 3 +-
drivers/md/bcache/request.c | 2 +-
.../test-drivers/vivid/vivid-touch-cap.c | 2 +-
drivers/mmc/core/core.c | 4 +-
drivers/mmc/host/dw_mmc.c | 2 +-
drivers/mtd/nand/raw/nandsim.c | 4 +-
drivers/mtd/tests/mtd_nandecctest.c | 10 +--
drivers/mtd/tests/stresstest.c | 17 +---
drivers/mtd/ubi/debug.c | 2 +-
drivers/mtd/ubi/debug.h | 6 +-
drivers/net/ethernet/broadcom/cnic.c | 3 +-
.../chelsio/inline_crypto/chtls/chtls_io.c | 4 +-
drivers/net/hamradio/baycom_epp.c | 2 +-
drivers/net/hamradio/hdlcdrv.c | 2 +-
drivers/net/hamradio/yam.c | 2 +-
drivers/net/phy/at803x.c | 2 +-
.../broadcom/brcm80211/brcmfmac/p2p.c | 2 +-
.../net/wireless/intel/iwlwifi/mvm/mac-ctxt.c | 2 +-
drivers/scsi/fcoe/fcoe_ctlr.c | 4 +-
drivers/scsi/qedi/qedi_main.c | 2 +-
fs/ceph/inode.c | 2 +-
fs/ceph/mdsmap.c | 2 +-
fs/ext4/super.c | 7 +-
fs/f2fs/gc.c | 2 +-
fs/f2fs/segment.c | 8 +-
fs/ubifs/debug.c | 8 +-
fs/ubifs/lpt_commit.c | 14 +--
fs/ubifs/tnc_commit.c | 2 +-
fs/xfs/libxfs/xfs_alloc.c | 2 +-
fs/xfs/libxfs/xfs_ialloc.c | 2 +-
fs/xfs/xfs_error.c | 2 +-
include/linux/nodemask.h | 2 +-
kernel/bpf/core.c | 4 +-
kernel/locking/test-ww_mutex.c | 4 +-
kernel/time/clocksource.c | 2 +-
lib/fault-inject.c | 2 +-
lib/find_bit_benchmark.c | 4 +-
lib/kobject.c | 2 +-
lib/reed_solomon/test_rslib.c | 6 +-
lib/sbitmap.c | 2 +-
lib/test-string_helpers.c | 2 +-
lib/test_hexdump.c | 10 +--
lib/test_kasan.c | 6 +-
lib/test_list_sort.c | 2 +-
mm/migrate.c | 2 +-
mm/slub.c | 2 +-
net/802/garp.c | 2 +-
net/802/mrp.c | 2 +-
net/ceph/mon_client.c | 2 +-
net/ceph/osd_client.c | 2 +-
net/core/neighbour.c | 2 +-
net/core/pktgen.c | 43 +++++-----
net/core/stream.c | 2 +-
net/ipv4/igmp.c | 6 +-
net/ipv4/inet_connection_sock.c | 2 +-
net/ipv4/inet_hashtables.c | 2 +-
net/ipv6/addrconf.c | 8 +-
net/ipv6/mcast.c | 10 +--
net/netfilter/ipvs/ip_vs_twos.c | 4 +-
net/packet/af_packet.c | 2 +-
net/sched/act_gact.c | 2 +-
net/sched/act_sample.c | 2 +-
net/sched/sch_netem.c | 4 +-
net/sctp/socket.c | 2 +-
net/sunrpc/cache.c | 2 +-
net/sunrpc/xprtsock.c | 2 +-
net/tipc/socket.c | 2 +-
net/xfrm/xfrm_state.c | 2 +-
90 files changed, 205 insertions(+), 219 deletions(-)
diff --git a/arch/arm/kernel/process.c b/arch/arm/kernel/process.c
index 96f3fbd51764..129279b33b1d 100644
--- a/arch/arm/kernel/process.c
+++ b/arch/arm/kernel/process.c
@@ -375,7 +375,7 @@ static unsigned long sigpage_addr(const struct mm_struct *mm,
slots = ((last - first) >> PAGE_SHIFT) + 1;
- offset = get_random_int() % slots;
+ offset = prandom_u32_max(slots);
addr = first + (offset << PAGE_SHIFT);
diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
index 92bcc1768f0b..87203429f802 100644
--- a/arch/arm64/kernel/process.c
+++ b/arch/arm64/kernel/process.c
@@ -595,7 +595,7 @@ unsigned long __get_wchan(struct task_struct *p)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
- sp -= get_random_int() & ~PAGE_MASK;
+ sp -= prandom_u32_max(PAGE_SIZE);
return sp & ~0xf;
}
diff --git a/arch/loongarch/kernel/process.c b/arch/loongarch/kernel/process.c
index 660492f064e7..1256e3582475 100644
--- a/arch/loongarch/kernel/process.c
+++ b/arch/loongarch/kernel/process.c
@@ -293,7 +293,7 @@ unsigned long stack_top(void)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
- sp -= get_random_int() & ~PAGE_MASK;
+ sp -= prandom_u32_max(PAGE_SIZE);
return sp & STACK_ALIGN;
}
diff --git a/arch/loongarch/kernel/vdso.c b/arch/loongarch/kernel/vdso.c
index f32c38abd791..8c9826062652 100644
--- a/arch/loongarch/kernel/vdso.c
+++ b/arch/loongarch/kernel/vdso.c
@@ -78,7 +78,7 @@ static unsigned long vdso_base(void)
unsigned long base = STACK_TOP;
if (current->flags & PF_RANDOMIZE) {
- base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1);
+ base += prandom_u32_max(VDSO_RANDOMIZE_SIZE);
base = PAGE_ALIGN(base);
}
diff --git a/arch/mips/kernel/process.c b/arch/mips/kernel/process.c
index 35b912bce429..bbe9ce471791 100644
--- a/arch/mips/kernel/process.c
+++ b/arch/mips/kernel/process.c
@@ -711,7 +711,7 @@ unsigned long mips_stack_top(void)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
- sp -= get_random_int() & ~PAGE_MASK;
+ sp -= prandom_u32_max(PAGE_SIZE);
return sp & ALMASK;
}
diff --git a/arch/mips/kernel/vdso.c b/arch/mips/kernel/vdso.c
index b2cc2c2dd4bf..5fd9bf1d596c 100644
--- a/arch/mips/kernel/vdso.c
+++ b/arch/mips/kernel/vdso.c
@@ -79,7 +79,7 @@ static unsigned long vdso_base(void)
}
if (current->flags & PF_RANDOMIZE) {
- base += get_random_int() & (VDSO_RANDOMIZE_SIZE - 1);
+ base += prandom_u32_max(VDSO_RANDOMIZE_SIZE);
base = PAGE_ALIGN(base);
}
diff --git a/arch/parisc/kernel/vdso.c b/arch/parisc/kernel/vdso.c
index 63dc44c4c246..47e5960a2f96 100644
--- a/arch/parisc/kernel/vdso.c
+++ b/arch/parisc/kernel/vdso.c
@@ -75,7 +75,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm,
map_base = mm->mmap_base;
if (current->flags & PF_RANDOMIZE)
- map_base -= (get_random_int() & 0x1f) * PAGE_SIZE;
+ map_base -= prandom_u32_max(0x20) * PAGE_SIZE;
vdso_text_start = get_unmapped_area(NULL, map_base, vdso_text_len, 0, 0);
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 37df0428e4fb..599391c23573 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -2308,6 +2308,6 @@ void notrace __ppc64_runlatch_off(void)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
- sp -= get_random_int() & ~PAGE_MASK;
+ sp -= prandom_u32_max(PAGE_SIZE);
return sp & ~0xf;
}
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index d5119e039d85..5ec78555dd2e 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -224,7 +224,7 @@ unsigned long __get_wchan(struct task_struct *p)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
- sp -= get_random_int() & ~PAGE_MASK;
+ sp -= prandom_u32_max(PAGE_SIZE);
return sp & ~0xf;
}
diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c
index 5075cde77b29..a6b5db59cf40 100644
--- a/arch/s390/kernel/vdso.c
+++ b/arch/s390/kernel/vdso.c
@@ -226,7 +226,7 @@ static unsigned long vdso_addr(unsigned long start, unsigned long len)
end -= len;
if (end > start) {
- offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1);
+ offset = prandom_u32_max(((end - start) >> PAGE_SHIFT) + 1);
addr = start + (offset << PAGE_SHIFT);
} else {
addr = start;
diff --git a/arch/sparc/vdso/vma.c b/arch/sparc/vdso/vma.c
index cc19e09b0fa1..ae9a86cb6f3d 100644
--- a/arch/sparc/vdso/vma.c
+++ b/arch/sparc/vdso/vma.c
@@ -354,7 +354,7 @@ static unsigned long vdso_addr(unsigned long start, unsigned int len)
unsigned int offset;
/* This loses some more bits than a modulo, but is cheaper */
- offset = get_random_int() & (PTRS_PER_PTE - 1);
+ offset = prandom_u32_max(PTRS_PER_PTE);
return start + (offset << PAGE_SHIFT);
}
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 80b90b1276a1..010bc422a09d 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -356,7 +356,7 @@ int singlestepping(void * t)
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
- sp -= get_random_int() % 8192;
+ sp -= prandom_u32_max(8192);
return sp & ~0xf;
}
#endif
diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c
index 1000d457c332..b64c58c6940f 100644
--- a/arch/x86/entry/vdso/vma.c
+++ b/arch/x86/entry/vdso/vma.c
@@ -327,7 +327,7 @@ static unsigned long vdso_addr(unsigned long start, unsigned len)
end -= len;
if (end > start) {
- offset = get_random_int() % (((end - start) >> PAGE_SHIFT) + 1);
+ offset = prandom_u32_max(((end - start) >> PAGE_SHIFT) + 1);
addr = start + (offset << PAGE_SHIFT);
} else {
addr = start;
diff --git a/arch/x86/kernel/module.c b/arch/x86/kernel/module.c
index b1abf663417c..c032edcd3d95 100644
--- a/arch/x86/kernel/module.c
+++ b/arch/x86/kernel/module.c
@@ -53,7 +53,7 @@ static unsigned long int get_module_load_offset(void)
*/
if (module_load_offset == 0)
module_load_offset =
- (get_random_int() % 1024 + 1) * PAGE_SIZE;
+ (prandom_u32_max(1024) + 1) * PAGE_SIZE;
mutex_unlock(&module_kaslr_mutex);
}
return module_load_offset;
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 58a6ea472db9..c21b7347a26d 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -965,7 +965,7 @@ early_param("idle", idle_setup);
unsigned long arch_align_stack(unsigned long sp)
{
if (!(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
- sp -= get_random_int() % 8192;
+ sp -= prandom_u32_max(8192);
return sp & ~0xf;
}
diff --git a/arch/x86/mm/pat/cpa-test.c b/arch/x86/mm/pat/cpa-test.c
index 0612a73638a8..423b21e80929 100644
--- a/arch/x86/mm/pat/cpa-test.c
+++ b/arch/x86/mm/pat/cpa-test.c
@@ -136,10 +136,10 @@ static int pageattr_test(void)
failed += print_split(&sa);
for (i = 0; i < NTEST; i++) {
- unsigned long pfn = prandom_u32() % max_pfn_mapped;
+ unsigned long pfn = prandom_u32_max(max_pfn_mapped);
addr[i] = (unsigned long)__va(pfn << PAGE_SHIFT);
- len[i] = prandom_u32() % NPAGES;
+ len[i] = prandom_u32_max(NPAGES);
len[i] = min_t(unsigned long, len[i], max_pfn_mapped - pfn - 1);
if (len[i] == 0)
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index 5349ffee6bbd..be45217acde4 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -855,9 +855,9 @@ static int prepare_keybuf(const u8 *key, unsigned int ksize,
/* Generate a random length in range [0, max_len], but prefer smaller values */
static unsigned int generate_random_length(unsigned int max_len)
{
- unsigned int len = prandom_u32() % (max_len + 1);
+ unsigned int len = prandom_u32_max(max_len + 1);
- switch (prandom_u32() % 4) {
+ switch (prandom_u32_max(4)) {
case 0:
return len % 64;
case 1:
@@ -874,14 +874,14 @@ static void flip_random_bit(u8 *buf, size_t size)
{
size_t bitpos;
- bitpos = prandom_u32() % (size * 8);
+ bitpos = prandom_u32_max(size * 8);
buf[bitpos / 8] ^= 1 << (bitpos % 8);
}
/* Flip a random byte in the given nonempty data buffer */
static void flip_random_byte(u8 *buf, size_t size)
{
- buf[prandom_u32() % size] ^= 0xff;
+ buf[prandom_u32_max(size)] ^= 0xff;
}
/* Sometimes make some random changes to the given nonempty data buffer */
@@ -891,15 +891,15 @@ static void mutate_buffer(u8 *buf, size_t size)
size_t i;
/* Sometimes flip some bits */
- if (prandom_u32() % 4 == 0) {
- num_flips = min_t(size_t, 1 << (prandom_u32() % 8), size * 8);
+ if (prandom_u32_max(4) == 0) {
+ num_flips = min_t(size_t, 1 << prandom_u32_max(8), size * 8);
for (i = 0; i < num_flips; i++)
flip_random_bit(buf, size);
}
/* Sometimes flip some bytes */
- if (prandom_u32() % 4 == 0) {
- num_flips = min_t(size_t, 1 << (prandom_u32() % 8), size);
+ if (prandom_u32_max(4) == 0) {
+ num_flips = min_t(size_t, 1 << prandom_u32_max(8), size);
for (i = 0; i < num_flips; i++)
flip_random_byte(buf, size);
}
@@ -915,11 +915,11 @@ static void generate_random_bytes(u8 *buf, size_t count)
if (count == 0)
return;
- switch (prandom_u32() % 8) { /* Choose a generation strategy */
+ switch (prandom_u32_max(8)) { /* Choose a generation strategy */
case 0:
case 1:
/* All the same byte, plus optional mutations */
- switch (prandom_u32() % 4) {
+ switch (prandom_u32_max(4)) {
case 0:
b = 0x00;
break;
@@ -959,24 +959,24 @@ static char *generate_random_sgl_divisions(struct test_sg_division *divs,
unsigned int this_len;
const char *flushtype_str;
- if (div == &divs[max_divs - 1] || prandom_u32() % 2 == 0)
+ if (div == &divs[max_divs - 1] || prandom_u32_max(2) == 0)
this_len = remaining;
else
- this_len = 1 + (prandom_u32() % remaining);
+ this_len = 1 + prandom_u32_max(remaining);
div->proportion_of_total = this_len;
- if (prandom_u32() % 4 == 0)
- div->offset = (PAGE_SIZE - 128) + (prandom_u32() % 128);
- else if (prandom_u32() % 2 == 0)
- div->offset = prandom_u32() % 32;
+ if (prandom_u32_max(4) == 0)
+ div->offset = (PAGE_SIZE - 128) + prandom_u32_max(128);
+ else if (prandom_u32_max(2) == 0)
+ div->offset = prandom_u32_max(32);
else
- div->offset = prandom_u32() % PAGE_SIZE;
- if (prandom_u32() % 8 == 0)
+ div->offset = prandom_u32_max(PAGE_SIZE);
+ if (prandom_u32_max(8) == 0)
div->offset_relative_to_alignmask = true;
div->flush_type = FLUSH_TYPE_NONE;
if (gen_flushes) {
- switch (prandom_u32() % 4) {
+ switch (prandom_u32_max(4)) {
case 0:
div->flush_type = FLUSH_TYPE_REIMPORT;
break;
@@ -988,7 +988,7 @@ static char *generate_random_sgl_divisions(struct test_sg_division *divs,
if (div->flush_type != FLUSH_TYPE_NONE &&
!(req_flags & CRYPTO_TFM_REQ_MAY_SLEEP) &&
- prandom_u32() % 2 == 0)
+ prandom_u32_max(2) == 0)
div->nosimd = true;
switch (div->flush_type) {
@@ -1035,7 +1035,7 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
p += scnprintf(p, end - p, "random:");
- switch (prandom_u32() % 4) {
+ switch (prandom_u32_max(4)) {
case 0:
case 1:
cfg->inplace_mode = OUT_OF_PLACE;
@@ -1050,12 +1050,12 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
break;
}
- if (prandom_u32() % 2 == 0) {
+ if (prandom_u32_max(2) == 0) {
cfg->req_flags |= CRYPTO_TFM_REQ_MAY_SLEEP;
p += scnprintf(p, end - p, " may_sleep");
}
- switch (prandom_u32() % 4) {
+ switch (prandom_u32_max(4)) {
case 0:
cfg->finalization_type = FINALIZATION_TYPE_FINAL;
p += scnprintf(p, end - p, " use_final");
@@ -1071,7 +1071,7 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
}
if (!(cfg->req_flags & CRYPTO_TFM_REQ_MAY_SLEEP) &&
- prandom_u32() % 2 == 0) {
+ prandom_u32_max(2) == 0) {
cfg->nosimd = true;
p += scnprintf(p, end - p, " nosimd");
}
@@ -1084,7 +1084,7 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
cfg->req_flags);
p += scnprintf(p, end - p, "]");
- if (cfg->inplace_mode == OUT_OF_PLACE && prandom_u32() % 2 == 0) {
+ if (cfg->inplace_mode == OUT_OF_PLACE && prandom_u32_max(2) == 0) {
p += scnprintf(p, end - p, " dst_divs=[");
p = generate_random_sgl_divisions(cfg->dst_divs,
ARRAY_SIZE(cfg->dst_divs),
@@ -1093,13 +1093,13 @@ static void generate_random_testvec_config(struct testvec_config *cfg,
p += scnprintf(p, end - p, "]");
}
- if (prandom_u32() % 2 == 0) {
- cfg->iv_offset = 1 + (prandom_u32() % MAX_ALGAPI_ALIGNMASK);
+ if (prandom_u32_max(2) == 0) {
+ cfg->iv_offset = 1 + prandom_u32_max(MAX_ALGAPI_ALIGNMASK);
p += scnprintf(p, end - p, " iv_offset=%u", cfg->iv_offset);
}
- if (prandom_u32() % 2 == 0) {
- cfg->key_offset = 1 + (prandom_u32() % MAX_ALGAPI_ALIGNMASK);
+ if (prandom_u32_max(2) == 0) {
+ cfg->key_offset = 1 + prandom_u32_max(MAX_ALGAPI_ALIGNMASK);
p += scnprintf(p, end - p, " key_offset=%u", cfg->key_offset);
}
@@ -1652,8 +1652,8 @@ static void generate_random_hash_testvec(struct shash_desc *desc,
vec->ksize = 0;
if (maxkeysize) {
vec->ksize = maxkeysize;
- if (prandom_u32() % 4 == 0)
- vec->ksize = 1 + (prandom_u32() % maxkeysize);
+ if (prandom_u32_max(4) == 0)
+ vec->ksize = 1 + prandom_u32_max(maxkeysize);
generate_random_bytes((u8 *)vec->key, vec->ksize);
vec->setkey_error = crypto_shash_setkey(desc->tfm, vec->key,
@@ -2218,13 +2218,13 @@ static void mutate_aead_message(struct aead_testvec *vec, bool aad_iv,
const unsigned int aad_tail_size = aad_iv ? ivsize : 0;
const unsigned int authsize = vec->clen - vec->plen;
- if (prandom_u32() % 2 == 0 && vec->alen > aad_tail_size) {
+ if (prandom_u32_max(2) == 0 && vec->alen > aad_tail_size) {
/* Mutate the AAD */
flip_random_bit((u8 *)vec->assoc, vec->alen - aad_tail_size);
- if (prandom_u32() % 2 == 0)
+ if (prandom_u32_max(2) == 0)
return;
}
- if (prandom_u32() % 2 == 0) {
+ if (prandom_u32_max(2) == 0) {
/* Mutate auth tag (assuming it's at the end of ciphertext) */
flip_random_bit((u8 *)vec->ctext + vec->plen, authsize);
} else {
@@ -2249,7 +2249,7 @@ static void generate_aead_message(struct aead_request *req,
const unsigned int ivsize = crypto_aead_ivsize(tfm);
const unsigned int authsize = vec->clen - vec->plen;
const bool inauthentic = (authsize >= MIN_COLLISION_FREE_AUTHSIZE) &&
- (prefer_inauthentic || prandom_u32() % 4 == 0);
+ (prefer_inauthentic || prandom_u32_max(4) == 0);
/* Generate the AAD. */
generate_random_bytes((u8 *)vec->assoc, vec->alen);
@@ -2257,7 +2257,7 @@ static void generate_aead_message(struct aead_request *req,
/* Avoid implementation-defined behavior. */
memcpy((u8 *)vec->assoc + vec->alen - ivsize, vec->iv, ivsize);
- if (inauthentic && prandom_u32() % 2 == 0) {
+ if (inauthentic && prandom_u32_max(2) == 0) {
/* Generate a random ciphertext. */
generate_random_bytes((u8 *)vec->ctext, vec->clen);
} else {
@@ -2321,8 +2321,8 @@ static void generate_random_aead_testvec(struct aead_request *req,
/* Key: length in [0, maxkeysize], but usually choose maxkeysize */
vec->klen = maxkeysize;
- if (prandom_u32() % 4 == 0)
- vec->klen = prandom_u32() % (maxkeysize + 1);
+ if (prandom_u32_max(4) == 0)
+ vec->klen = prandom_u32_max(maxkeysize + 1);
generate_random_bytes((u8 *)vec->key, vec->klen);
vec->setkey_error = crypto_aead_setkey(tfm, vec->key, vec->klen);
@@ -2331,8 +2331,8 @@ static void generate_random_aead_testvec(struct aead_request *req,
/* Tag length: in [0, maxauthsize], but usually choose maxauthsize */
authsize = maxauthsize;
- if (prandom_u32() % 4 == 0)
- authsize = prandom_u32() % (maxauthsize + 1);
+ if (prandom_u32_max(4) == 0)
+ authsize = prandom_u32_max(maxauthsize + 1);
if (prefer_inauthentic && authsize < MIN_COLLISION_FREE_AUTHSIZE)
authsize = MIN_COLLISION_FREE_AUTHSIZE;
if (WARN_ON(authsize > maxdatasize))
@@ -2342,7 +2342,7 @@ static void generate_random_aead_testvec(struct aead_request *req,
/* AAD, plaintext, and ciphertext lengths */
total_len = generate_random_length(maxdatasize);
- if (prandom_u32() % 4 == 0)
+ if (prandom_u32_max(4) == 0)
vec->alen = 0;
else
vec->alen = generate_random_length(total_len);
@@ -2958,8 +2958,8 @@ static void generate_random_cipher_testvec(struct skcipher_request *req,
/* Key: length in [0, maxkeysize], but usually choose maxkeysize */
vec->klen = maxkeysize;
- if (prandom_u32() % 4 == 0)
- vec->klen = prandom_u32() % (maxkeysize + 1);
+ if (prandom_u32_max(4) == 0)
+ vec->klen = prandom_u32_max(maxkeysize + 1);
generate_random_bytes((u8 *)vec->key, vec->klen);
vec->setkey_error = crypto_skcipher_setkey(tfm, vec->key, vec->klen);
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index c897c4572036..ee69d50ba4fd 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -781,7 +781,7 @@ static struct socket *drbd_wait_for_connect(struct drbd_connection *connection,
timeo = connect_int * HZ;
/* 28.5% random jitter */
- timeo += (prandom_u32() & 1) ? timeo / 7 : -timeo / 7;
+ timeo += prandom_u32_max(2) ? timeo / 7 : -timeo / 7;
err = wait_for_completion_interruptible_timeout(&ad->door_bell, timeo);
if (err <= 0)
@@ -1004,7 +1004,7 @@ static int conn_connect(struct drbd_connection *connection)
drbd_warn(connection, "Error receiving initial packet\n");
sock_release(s);
randomize:
- if (prandom_u32() & 1)
+ if (prandom_u32_max(2))
goto retry;
}
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index cd75b0ca2555..845023c14eb3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2424,7 +2424,7 @@ gen8_dispatch_bsd_engine(struct drm_i915_private *dev_priv,
/* Check whether the file_priv has already selected one ring. */
if ((int)file_priv->bsd_engine < 0)
file_priv->bsd_engine =
- get_random_int() % num_vcs_engines(dev_priv);
+ prandom_u32_max(num_vcs_engines(dev_priv));
return file_priv->bsd_engine;
}
diff --git a/drivers/infiniband/core/cma.c b/drivers/infiniband/core/cma.c
index 70da57ef2eeb..cc2222b85c88 100644
--- a/drivers/infiniband/core/cma.c
+++ b/drivers/infiniband/core/cma.c
@@ -3807,7 +3807,7 @@ static int cma_alloc_any_port(enum rdma_ucm_port_space ps,
inet_get_local_port_range(net, &low, &high);
remaining = (high - low) + 1;
- rover = prandom_u32() % remaining + low;
+ rover = prandom_u32_max(remaining) + low;
retry:
if (last_used_port != rover) {
struct rdma_bind_list *bind_list;
diff --git a/drivers/infiniband/hw/cxgb4/id_table.c b/drivers/infiniband/hw/cxgb4/id_table.c
index f64e7e02b129..280d61466855 100644
--- a/drivers/infiniband/hw/cxgb4/id_table.c
+++ b/drivers/infiniband/hw/cxgb4/id_table.c
@@ -54,7 +54,7 @@ u32 c4iw_id_alloc(struct c4iw_id_table *alloc)
if (obj < alloc->max) {
if (alloc->flags & C4IW_ID_TABLE_F_RANDOM)
- alloc->last += prandom_u32() % RANDOM_SKIP;
+ alloc->last += prandom_u32_max(RANDOM_SKIP);
else
alloc->last = obj + 1;
if (alloc->last >= alloc->max)
@@ -85,7 +85,7 @@ int c4iw_id_table_alloc(struct c4iw_id_table *alloc, u32 start, u32 num,
alloc->start = start;
alloc->flags = flags;
if (flags & C4IW_ID_TABLE_F_RANDOM)
- alloc->last = prandom_u32() % RANDOM_SKIP;
+ alloc->last = prandom_u32_max(RANDOM_SKIP);
else
alloc->last = 0;
alloc->max = num;
diff --git a/drivers/infiniband/hw/hns/hns_roce_ah.c b/drivers/infiniband/hw/hns/hns_roce_ah.c
index 492b122d0521..480c062dd04f 100644
--- a/drivers/infiniband/hw/hns/hns_roce_ah.c
+++ b/drivers/infiniband/hw/hns/hns_roce_ah.c
@@ -41,9 +41,8 @@ static inline u16 get_ah_udp_sport(const struct rdma_ah_attr *ah_attr)
u16 sport;
if (!fl)
- sport = get_random_u32() %
- (IB_ROCE_UDP_ENCAP_VALID_PORT_MAX + 1 -
- IB_ROCE_UDP_ENCAP_VALID_PORT_MIN) +
+ sport = prandom_u32_max(IB_ROCE_UDP_ENCAP_VALID_PORT_MAX + 1 -
+ IB_ROCE_UDP_ENCAP_VALID_PORT_MIN) +
IB_ROCE_UDP_ENCAP_VALID_PORT_MIN;
else
sport = rdma_flow_label_to_udp_sport(fl);
diff --git a/drivers/infiniband/ulp/rtrs/rtrs-clt.c b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
index 758e1d7ebc36..8546b8816524 100644
--- a/drivers/infiniband/ulp/rtrs/rtrs-clt.c
+++ b/drivers/infiniband/ulp/rtrs/rtrs-clt.c
@@ -1517,8 +1517,7 @@ static void rtrs_clt_err_recovery_work(struct work_struct *work)
rtrs_clt_stop_and_destroy_conns(clt_path);
queue_delayed_work(rtrs_wq, &clt_path->reconnect_dwork,
msecs_to_jiffies(delay_ms +
- prandom_u32() %
- RTRS_RECONNECT_SEED));
+ prandom_u32_max(RTRS_RECONNECT_SEED)));
}
static struct rtrs_clt_path *alloc_path(struct rtrs_clt_sess *clt,
diff --git a/drivers/md/bcache/request.c b/drivers/md/bcache/request.c
index f2c5a7e06fa9..3427555b0cca 100644
--- a/drivers/md/bcache/request.c
+++ b/drivers/md/bcache/request.c
@@ -401,7 +401,7 @@ static bool check_should_bypass(struct cached_dev *dc, struct bio *bio)
}
if (bypass_torture_test(dc)) {
- if ((get_random_int() & 3) == 3)
+ if (prandom_u32_max(4) == 3)
goto skip;
else
goto rescale;
diff --git a/drivers/media/test-drivers/vivid/vivid-touch-cap.c b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
index 64e3e4cb30c2..792660a85bc1 100644
--- a/drivers/media/test-drivers/vivid/vivid-touch-cap.c
+++ b/drivers/media/test-drivers/vivid/vivid-touch-cap.c
@@ -221,7 +221,7 @@ static void vivid_fill_buff_noise(__s16 *tch_buf, int size)
static inline int get_random_pressure(void)
{
- return get_random_int() % VIVID_PRESSURE_LIMIT;
+ return prandom_u32_max(VIVID_PRESSURE_LIMIT);
}
static void vivid_tch_buf_set(struct v4l2_pix_format *f,
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index ef53a2578824..95fa8fb1d45f 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -97,8 +97,8 @@ static void mmc_should_fail_request(struct mmc_host *host,
!should_fail(&host->fail_mmc_request, data->blksz * data->blocks))
return;
- data->error = data_errors[prandom_u32() % ARRAY_SIZE(data_errors)];
- data->bytes_xfered = (prandom_u32() % (data->bytes_xfered >> 9)) << 9;
+ data->error = data_errors[prandom_u32_max(ARRAY_SIZE(data_errors))];
+ data->bytes_xfered = prandom_u32_max(data->bytes_xfered >> 9) << 9;
}
#else /* CONFIG_FAIL_MMC_REQUEST */
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c
index 581614196a84..c78bbc22e0d1 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -1858,7 +1858,7 @@ static void dw_mci_start_fault_timer(struct dw_mci *host)
* Try to inject the error at random points during the data transfer.
*/
hrtimer_start(&host->fault_timer,
- ms_to_ktime(prandom_u32() % 25),
+ ms_to_ktime(prandom_u32_max(25)),
HRTIMER_MODE_REL);
}
diff --git a/drivers/mtd/nand/raw/nandsim.c b/drivers/mtd/nand/raw/nandsim.c
index 24beade95c7f..50bcf745e816 100644
--- a/drivers/mtd/nand/raw/nandsim.c
+++ b/drivers/mtd/nand/raw/nandsim.c
@@ -1405,9 +1405,9 @@ static void ns_do_bit_flips(struct nandsim *ns, int num)
if (bitflips && prandom_u32() < (1 << 22)) {
int flips = 1;
if (bitflips > 1)
- flips = (prandom_u32() % (int) bitflips) + 1;
+ flips = prandom_u32_max(bitflips) + 1;
while (flips--) {
- int pos = prandom_u32() % (num * 8);
+ int pos = prandom_u32_max(num * 8);
ns->buf.byte[pos / 8] ^= (1 << (pos % 8));
NS_WARN("read_page: flipping bit %d in page %d "
"reading from %d ecc: corrected=%u failed=%u\n",
diff --git a/drivers/mtd/tests/mtd_nandecctest.c b/drivers/mtd/tests/mtd_nandecctest.c
index c4f271314f52..1c7201b0f372 100644
--- a/drivers/mtd/tests/mtd_nandecctest.c
+++ b/drivers/mtd/tests/mtd_nandecctest.c
@@ -47,7 +47,7 @@ struct nand_ecc_test {
static void single_bit_error_data(void *error_data, void *correct_data,
size_t size)
{
- unsigned int offset = prandom_u32() % (size * BITS_PER_BYTE);
+ unsigned int offset = prandom_u32_max(size * BITS_PER_BYTE);
memcpy(error_data, correct_data, size);
__change_bit_le(offset, error_data);
@@ -58,9 +58,9 @@ static void double_bit_error_data(void *error_data, void *correct_data,
{
unsigned int offset[2];
- offset[0] = prandom_u32() % (size * BITS_PER_BYTE);
+ offset[0] = prandom_u32_max(size * BITS_PER_BYTE);
do {
- offset[1] = prandom_u32() % (size * BITS_PER_BYTE);
+ offset[1] = prandom_u32_max(size * BITS_PER_BYTE);
} while (offset[0] == offset[1]);
memcpy(error_data, correct_data, size);
@@ -71,7 +71,7 @@ static void double_bit_error_data(void *error_data, void *correct_data,
static unsigned int random_ecc_bit(size_t size)
{
- unsigned int offset = prandom_u32() % (3 * BITS_PER_BYTE);
+ unsigned int offset = prandom_u32_max(3 * BITS_PER_BYTE);
if (size == 256) {
/*
@@ -79,7 +79,7 @@ static unsigned int random_ecc_bit(size_t size)
* and 17th bit) in ECC code for 256 byte data block
*/
while (offset == 16 || offset == 17)
- offset = prandom_u32() % (3 * BITS_PER_BYTE);
+ offset = prandom_u32_max(3 * BITS_PER_BYTE);
}
return offset;
diff --git a/drivers/mtd/tests/stresstest.c b/drivers/mtd/tests/stresstest.c
index cb29c8c1b370..d2faaca7f19d 100644
--- a/drivers/mtd/tests/stresstest.c
+++ b/drivers/mtd/tests/stresstest.c
@@ -45,9 +45,8 @@ static int rand_eb(void)
unsigned int eb;
again:
- eb = prandom_u32();
/* Read or write up 2 eraseblocks at a time - hence 'ebcnt - 1' */
- eb %= (ebcnt - 1);
+ eb = prandom_u32_max(ebcnt - 1);
if (bbt[eb])
goto again;
return eb;
@@ -55,20 +54,12 @@ static int rand_eb(void)
static int rand_offs(void)
{
- unsigned int offs;
-
- offs = prandom_u32();
- offs %= bufsize;
- return offs;
+ return prandom_u32_max(bufsize);
}
static int rand_len(int offs)
{
- unsigned int len;
-
- len = prandom_u32();
- len %= (bufsize - offs);
- return len;
+ return prandom_u32_max(bufsize - offs);
}
static int do_read(void)
@@ -127,7 +118,7 @@ static int do_write(void)
static int do_operation(void)
{
- if (prandom_u32() & 1)
+ if (prandom_u32_max(2))
return do_read();
else
return do_write();
diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index 31d427ee191a..908d0e088557 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -590,7 +590,7 @@ int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
- ubi->dbg.power_cut_counter += prandom_u32() % range;
+ ubi->dbg.power_cut_counter += prandom_u32_max(range);
}
return 0;
}
diff --git a/drivers/mtd/ubi/debug.h b/drivers/mtd/ubi/debug.h
index 118248a5d7d4..dc8d8f83657a 100644
--- a/drivers/mtd/ubi/debug.h
+++ b/drivers/mtd/ubi/debug.h
@@ -73,7 +73,7 @@ static inline int ubi_dbg_is_bgt_disabled(const struct ubi_device *ubi)
static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
{
if (ubi->dbg.emulate_bitflips)
- return !(prandom_u32() % 200);
+ return !prandom_u32_max(200);
return 0;
}
@@ -87,7 +87,7 @@ static inline int ubi_dbg_is_bitflip(const struct ubi_device *ubi)
static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
{
if (ubi->dbg.emulate_io_failures)
- return !(prandom_u32() % 500);
+ return !prandom_u32_max(500);
return 0;
}
@@ -101,7 +101,7 @@ static inline int ubi_dbg_is_write_failure(const struct ubi_device *ubi)
static inline int ubi_dbg_is_erase_failure(const struct ubi_device *ubi)
{
if (ubi->dbg.emulate_io_failures)
- return !(prandom_u32() % 400);
+ return !prandom_u32_max(400);
return 0;
}
diff --git a/drivers/net/ethernet/broadcom/cnic.c b/drivers/net/ethernet/broadcom/cnic.c
index e86503d97f32..f597b313acaa 100644
--- a/drivers/net/ethernet/broadcom/cnic.c
+++ b/drivers/net/ethernet/broadcom/cnic.c
@@ -4105,8 +4105,7 @@ static int cnic_cm_alloc_mem(struct cnic_dev *dev)
for (i = 0; i < MAX_CM_SK_TBL_SZ; i++)
atomic_set(&cp->csk_tbl[i].ref_count, 0);
- port_id = prandom_u32();
- port_id %= CNIC_LOCAL_PORT_RANGE;
+ port_id = prandom_u32_max(CNIC_LOCAL_PORT_RANGE);
if (cnic_init_id_tbl(&cp->csk_port_tbl, CNIC_LOCAL_PORT_RANGE,
CNIC_LOCAL_PORT_MIN, port_id)) {
cnic_cm_free_mem(dev);
diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_io.c b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_io.c
index 539992dad8ba..a4256087ac82 100644
--- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_io.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_io.c
@@ -919,8 +919,8 @@ static int csk_wait_memory(struct chtls_dev *cdev,
current_timeo = *timeo_p;
noblock = (*timeo_p ? false : true);
if (csk_mem_free(cdev, sk)) {
- current_timeo = (prandom_u32() % (HZ / 5)) + 2;
- vm_wait = (prandom_u32() % (HZ / 5)) + 2;
+ current_timeo = prandom_u32_max(HZ / 5) + 2;
+ vm_wait = prandom_u32_max(HZ / 5) + 2;
}
add_wait_queue(sk_sleep(sk), &wait);
diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index 3e69079ed694..7df78a721b04 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -438,7 +438,7 @@ static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
if ((--bc->hdlctx.slotcnt) > 0)
return 0;
bc->hdlctx.slotcnt = bc->ch_params.slottime;
- if ((prandom_u32() % 256) > bc->ch_params.ppersist)
+ if (prandom_u32_max(256) > bc->ch_params.ppersist)
return 0;
}
}
diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
index a6184d6c7b15..bef904325a0f 100644
--- a/drivers/net/hamradio/hdlcdrv.c
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -377,7 +377,7 @@ void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
if ((--s->hdlctx.slotcnt) > 0)
return;
s->hdlctx.slotcnt = s->ch_params.slottime;
- if ((prandom_u32() % 256) > s->ch_params.ppersist)
+ if (prandom_u32_max(256) > s->ch_params.ppersist)
return;
start_tx(dev, s);
}
diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 980f2be32f05..97a6cc5c7ae8 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -626,7 +626,7 @@ static void yam_arbitrate(struct net_device *dev)
yp->slotcnt = yp->slot / 10;
/* is random > persist ? */
- if ((prandom_u32() % 256) > yp->pers)
+ if (prandom_u32_max(256) > yp->pers)
return;
yam_start_tx(dev, yp);
diff --git a/drivers/net/phy/at803x.c b/drivers/net/phy/at803x.c
index 9e9adde335c8..349b7b1dbbf2 100644
--- a/drivers/net/phy/at803x.c
+++ b/drivers/net/phy/at803x.c
@@ -1758,7 +1758,7 @@ static int qca808x_phy_fast_retrain_config(struct phy_device *phydev)
static int qca808x_phy_ms_random_seed_set(struct phy_device *phydev)
{
- u16 seed_value = (prandom_u32() % QCA808X_MASTER_SLAVE_SEED_RANGE);
+ u16 seed_value = prandom_u32_max(QCA808X_MASTER_SLAVE_SEED_RANGE);
return at803x_debug_reg_mask(phydev, QCA808X_PHY_DEBUG_LOCAL_SEED,
QCA808X_MASTER_SLAVE_SEED_CFG,
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
index 479041f070f9..10d9d9c63b28 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/p2p.c
@@ -1128,7 +1128,7 @@ static void brcmf_p2p_afx_handler(struct work_struct *work)
if (afx_hdl->is_listen && afx_hdl->my_listen_chan)
/* 100ms ~ 300ms */
err = brcmf_p2p_discover_listen(p2p, afx_hdl->my_listen_chan,
- 100 * (1 + prandom_u32() % 3));
+ 100 * (1 + prandom_u32_max(3)));
else
err = brcmf_p2p_act_frm_search(p2p, afx_hdl->peer_listen_chan);
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c b/drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c
index ed586e6d7d64..de0c545d50fd 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/mac-ctxt.c
@@ -1099,7 +1099,7 @@ static void iwl_mvm_mac_ctxt_cmd_fill_ap(struct iwl_mvm *mvm,
iwl_mvm_mac_ap_iterator, &data);
if (data.beacon_device_ts) {
- u32 rand = (prandom_u32() % (64 - 36)) + 36;
+ u32 rand = prandom_u32_max(64 - 36) + 36;
mvmvif->ap_beacon_time = data.beacon_device_ts +
ieee80211_tu_to_usec(data.beacon_int * rand /
100);
diff --git a/drivers/scsi/fcoe/fcoe_ctlr.c b/drivers/scsi/fcoe/fcoe_ctlr.c
index 39e16eab47aa..ddc048069af2 100644
--- a/drivers/scsi/fcoe/fcoe_ctlr.c
+++ b/drivers/scsi/fcoe/fcoe_ctlr.c
@@ -2233,7 +2233,7 @@ static void fcoe_ctlr_vn_restart(struct fcoe_ctlr *fip)
if (fip->probe_tries < FIP_VN_RLIM_COUNT) {
fip->probe_tries++;
- wait = prandom_u32() % FIP_VN_PROBE_WAIT;
+ wait = prandom_u32_max(FIP_VN_PROBE_WAIT);
} else
wait = FIP_VN_RLIM_INT;
mod_timer(&fip->timer, jiffies + msecs_to_jiffies(wait));
@@ -3125,7 +3125,7 @@ static void fcoe_ctlr_vn_timeout(struct fcoe_ctlr *fip)
fcoe_all_vn2vn, 0);
fip->port_ka_time = jiffies +
msecs_to_jiffies(FIP_VN_BEACON_INT +
- (prandom_u32() % FIP_VN_BEACON_FUZZ));
+ prandom_u32_max(FIP_VN_BEACON_FUZZ));
}
if (time_before(fip->port_ka_time, next_time))
next_time = fip->port_ka_time;
diff --git a/drivers/scsi/qedi/qedi_main.c b/drivers/scsi/qedi/qedi_main.c
index cecfb2cb4c7b..df2fe7bd26d1 100644
--- a/drivers/scsi/qedi/qedi_main.c
+++ b/drivers/scsi/qedi/qedi_main.c
@@ -618,7 +618,7 @@ static int qedi_cm_alloc_mem(struct qedi_ctx *qedi)
sizeof(struct qedi_endpoint *)), GFP_KERNEL);
if (!qedi->ep_tbl)
return -ENOMEM;
- port_id = prandom_u32() % QEDI_LOCAL_PORT_RANGE;
+ port_id = prandom_u32_max(QEDI_LOCAL_PORT_RANGE);
if (qedi_init_id_tbl(&qedi->lcl_port_tbl, QEDI_LOCAL_PORT_RANGE,
QEDI_LOCAL_PORT_MIN, port_id)) {
qedi_cm_free_mem(qedi);
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 42351d7a0dd6..f0c6e7e7b92b 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c
@@ -362,7 +362,7 @@ static int ceph_fill_fragtree(struct inode *inode,
if (nsplits != ci->i_fragtree_nsplits) {
update = true;
} else if (nsplits) {
- i = prandom_u32() % nsplits;
+ i = prandom_u32_max(nsplits);
id = le32_to_cpu(fragtree->splits[i].frag);
if (!__ceph_find_frag(ci, id))
update = true;
diff --git a/fs/ceph/mdsmap.c b/fs/ceph/mdsmap.c
index 8d0a6d2c2da4..3fbabc98e1f7 100644
--- a/fs/ceph/mdsmap.c
+++ b/fs/ceph/mdsmap.c
@@ -29,7 +29,7 @@ static int __mdsmap_get_random_mds(struct ceph_mdsmap *m, bool ignore_laggy)
return -1;
/* pick */
- n = prandom_u32() % n;
+ n = prandom_u32_max(n);
for (j = 0, i = 0; i < m->possible_max_rank; i++) {
if (CEPH_MDS_IS_READY(i, ignore_laggy))
j++;
diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index d733db8a0b02..989365b878a6 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3782,8 +3782,7 @@ static int ext4_lazyinit_thread(void *arg)
}
if (!progress) {
elr->lr_next_sched = jiffies +
- (prandom_u32()
- % (EXT4_DEF_LI_MAX_START_DELAY * HZ));
+ prandom_u32_max(EXT4_DEF_LI_MAX_START_DELAY * HZ);
}
if (time_before(elr->lr_next_sched, next_wakeup))
next_wakeup = elr->lr_next_sched;
@@ -3930,8 +3929,8 @@ static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
* spread the inode table initialization requests
* better.
*/
- elr->lr_next_sched = jiffies + (prandom_u32() %
- (EXT4_DEF_LI_MAX_START_DELAY * HZ));
+ elr->lr_next_sched = jiffies + prandom_u32_max(
+ EXT4_DEF_LI_MAX_START_DELAY * HZ);
return elr;
}
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 6da21d405ce1..2c5fd1db3a3e 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -285,7 +285,7 @@ static void select_policy(struct f2fs_sb_info *sbi, int gc_type,
/* let's select beginning hot/small space first in no_heap mode*/
if (f2fs_need_rand_seg(sbi))
- p->offset = prandom_u32() % (MAIN_SECS(sbi) * sbi->segs_per_sec);
+ p->offset = prandom_u32_max(MAIN_SECS(sbi) * sbi->segs_per_sec);
else if (test_opt(sbi, NOHEAP) &&
(type == CURSEG_HOT_DATA || IS_NODESEG(type)))
p->offset = 0;
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 0de21f82d7bc..507f77f839f3 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2535,7 +2535,7 @@ static unsigned int __get_next_segno(struct f2fs_sb_info *sbi, int type)
sanity_check_seg_type(sbi, seg_type);
if (f2fs_need_rand_seg(sbi))
- return prandom_u32() % (MAIN_SECS(sbi) * sbi->segs_per_sec);
+ return prandom_u32_max(MAIN_SECS(sbi) * sbi->segs_per_sec);
/* if segs_per_sec is large than 1, we need to keep original policy. */
if (__is_large_section(sbi))
@@ -2589,7 +2589,7 @@ static void new_curseg(struct f2fs_sb_info *sbi, int type, bool new_sec)
curseg->alloc_type = LFS;
if (F2FS_OPTION(sbi).fs_mode == FS_MODE_FRAGMENT_BLK)
curseg->fragment_remained_chunk =
- prandom_u32() % sbi->max_fragment_chunk + 1;
+ prandom_u32_max(sbi->max_fragment_chunk) + 1;
}
static int __next_free_blkoff(struct f2fs_sb_info *sbi,
@@ -2626,9 +2626,9 @@ static void __refresh_next_blkoff(struct f2fs_sb_info *sbi,
/* To allocate block chunks in different sizes, use random number */
if (--seg->fragment_remained_chunk <= 0) {
seg->fragment_remained_chunk =
- prandom_u32() % sbi->max_fragment_chunk + 1;
+ prandom_u32_max(sbi->max_fragment_chunk) + 1;
seg->next_blkoff +=
- prandom_u32() % sbi->max_fragment_hole + 1;
+ prandom_u32_max(sbi->max_fragment_hole) + 1;
}
}
}
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index fc718f6178f2..f4d3b568aa64 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2467,7 +2467,7 @@ int dbg_check_nondata_nodes_order(struct ubifs_info *c, struct list_head *head)
static inline int chance(unsigned int n, unsigned int out_of)
{
- return !!((prandom_u32() % out_of) + 1 <= n);
+ return !!(prandom_u32_max(out_of) + 1 <= n);
}
@@ -2485,13 +2485,13 @@ static int power_cut_emulated(struct ubifs_info *c, int lnum, int write)
if (chance(1, 2)) {
d->pc_delay = 1;
/* Fail within 1 minute */
- delay = prandom_u32() % 60000;
+ delay = prandom_u32_max(60000);
d->pc_timeout = jiffies;
d->pc_timeout += msecs_to_jiffies(delay);
ubifs_warn(c, "failing after %lums", delay);
} else {
d->pc_delay = 2;
- delay = prandom_u32() % 10000;
+ delay = prandom_u32_max(10000);
/* Fail within 10000 operations */
d->pc_cnt_max = delay;
ubifs_warn(c, "failing after %lu calls", delay);
@@ -2571,7 +2571,7 @@ static int corrupt_data(const struct ubifs_info *c, const void *buf,
unsigned int from, to, ffs = chance(1, 2);
unsigned char *p = (void *)buf;
- from = prandom_u32() % len;
+ from = prandom_u32_max(len);
/* Corruption span max to end of write unit */
to = min(len, ALIGN(from + 1, c->max_write_size));
diff --git a/fs/ubifs/lpt_commit.c b/fs/ubifs/lpt_commit.c
index d76a19e460cd..cfbc31f709f4 100644
--- a/fs/ubifs/lpt_commit.c
+++ b/fs/ubifs/lpt_commit.c
@@ -1970,28 +1970,28 @@ static int dbg_populate_lsave(struct ubifs_info *c)
if (!dbg_is_chk_gen(c))
return 0;
- if (prandom_u32() & 3)
+ if (prandom_u32_max(4))
return 0;
for (i = 0; i < c->lsave_cnt; i++)
c->lsave[i] = c->main_first;
list_for_each_entry(lprops, &c->empty_list, list)
- c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum;
+ c->lsave[prandom_u32_max(c->lsave_cnt)] = lprops->lnum;
list_for_each_entry(lprops, &c->freeable_list, list)
- c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum;
+ c->lsave[prandom_u32_max(c->lsave_cnt)] = lprops->lnum;
list_for_each_entry(lprops, &c->frdi_idx_list, list)
- c->lsave[prandom_u32() % c->lsave_cnt] = lprops->lnum;
+ c->lsave[prandom_u32_max(c->lsave_cnt)] = lprops->lnum;
heap = &c->lpt_heap[LPROPS_DIRTY_IDX - 1];
for (i = 0; i < heap->cnt; i++)
- c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum;
+ c->lsave[prandom_u32_max(c->lsave_cnt)] = heap->arr[i]->lnum;
heap = &c->lpt_heap[LPROPS_DIRTY - 1];
for (i = 0; i < heap->cnt; i++)
- c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum;
+ c->lsave[prandom_u32_max(c->lsave_cnt)] = heap->arr[i]->lnum;
heap = &c->lpt_heap[LPROPS_FREE - 1];
for (i = 0; i < heap->cnt; i++)
- c->lsave[prandom_u32() % c->lsave_cnt] = heap->arr[i]->lnum;
+ c->lsave[prandom_u32_max(c->lsave_cnt)] = heap->arr[i]->lnum;
return 1;
}
diff --git a/fs/ubifs/tnc_commit.c b/fs/ubifs/tnc_commit.c
index 58c92c96ecef..01362ad5f804 100644
--- a/fs/ubifs/tnc_commit.c
+++ b/fs/ubifs/tnc_commit.c
@@ -700,7 +700,7 @@ static int alloc_idx_lebs(struct ubifs_info *c, int cnt)
c->ilebs[c->ileb_cnt++] = lnum;
dbg_cmt("LEB %d", lnum);
}
- if (dbg_is_chk_index(c) && !(prandom_u32() & 7))
+ if (dbg_is_chk_index(c) && !prandom_u32_max(8))
return -ENOSPC;
return 0;
}
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index e2bdf089c0a3..6261599bb389 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -1520,7 +1520,7 @@ xfs_alloc_ag_vextent_lastblock(
#ifdef DEBUG
/* Randomly don't execute the first algorithm. */
- if (prandom_u32() & 1)
+ if (prandom_u32_max(2))
return 0;
#endif
diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 6cdfd64bc56b..7838b31126e2 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -636,7 +636,7 @@ xfs_ialloc_ag_alloc(
/* randomly do sparse inode allocations */
if (xfs_has_sparseinodes(tp->t_mountp) &&
igeo->ialloc_min_blks < igeo->ialloc_blks)
- do_sparse = prandom_u32() & 1;
+ do_sparse = prandom_u32_max(2);
#endif
/*
diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index 296faa41d81d..7db588ed0be5 100644
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -274,7 +274,7 @@ xfs_errortag_test(
ASSERT(error_tag < XFS_ERRTAG_MAX);
randfactor = mp->m_errortag[error_tag];
- if (!randfactor || prandom_u32() % randfactor)
+ if (!randfactor || prandom_u32_max(randfactor))
return false;
xfs_warn_ratelimited(mp,
diff --git a/include/linux/nodemask.h b/include/linux/nodemask.h
index 4b71a96190a8..66ee9b4b7925 100644
--- a/include/linux/nodemask.h
+++ b/include/linux/nodemask.h
@@ -509,7 +509,7 @@ static inline int node_random(const nodemask_t *maskp)
w = nodes_weight(*maskp);
if (w)
bit = bitmap_ord_to_pos(maskp->bits,
- get_random_int() % w, MAX_NUMNODES);
+ prandom_u32_max(w), MAX_NUMNODES);
return bit;
#else
return 0;
diff --git a/kernel/bpf/core.c b/kernel/bpf/core.c
index 711fd293b6de..19593627e037 100644
--- a/kernel/bpf/core.c
+++ b/kernel/bpf/core.c
@@ -1032,7 +1032,7 @@ bpf_jit_binary_alloc(unsigned int proglen, u8 **image_ptr,
hdr->size = size;
hole = min_t(unsigned int, size - (proglen + sizeof(*hdr)),
PAGE_SIZE - sizeof(*hdr));
- start = (get_random_int() % hole) & ~(alignment - 1);
+ start = prandom_u32_max(hole) & ~(alignment - 1);
/* Leave a random number of instructions before BPF code. */
*image_ptr = &hdr->image[start];
@@ -1094,7 +1094,7 @@ bpf_jit_binary_pack_alloc(unsigned int proglen, u8 **image_ptr,
hole = min_t(unsigned int, size - (proglen + sizeof(*ro_header)),
BPF_PROG_CHUNK_SIZE - sizeof(*ro_header));
- start = (get_random_int() % hole) & ~(alignment - 1);
+ start = prandom_u32_max(hole) & ~(alignment - 1);
*image_ptr = &ro_header->image[start];
*rw_image = &(*rw_header)->image[start];
diff --git a/kernel/locking/test-ww_mutex.c b/kernel/locking/test-ww_mutex.c
index 353004155d65..43efb2a04160 100644
--- a/kernel/locking/test-ww_mutex.c
+++ b/kernel/locking/test-ww_mutex.c
@@ -399,7 +399,7 @@ static int *get_random_order(int count)
order[n] = n;
for (n = count - 1; n > 1; n--) {
- r = get_random_int() % (n + 1);
+ r = prandom_u32_max(n + 1);
if (r != n) {
tmp = order[n];
order[n] = order[r];
@@ -538,7 +538,7 @@ static void stress_one_work(struct work_struct *work)
{
struct stress *stress = container_of(work, typeof(*stress), work);
const int nlocks = stress->nlocks;
- struct ww_mutex *lock = stress->locks + (get_random_int() % nlocks);
+ struct ww_mutex *lock = stress->locks + prandom_u32_max(nlocks);
int err;
do {
diff --git a/kernel/time/clocksource.c b/kernel/time/clocksource.c
index cee5da1e54c4..8058bec87ace 100644
--- a/kernel/time/clocksource.c
+++ b/kernel/time/clocksource.c
@@ -310,7 +310,7 @@ static void clocksource_verify_choose_cpus(void)
* CPUs that are currently online.
*/
for (i = 1; i < n; i++) {
- cpu = prandom_u32() % nr_cpu_ids;
+ cpu = prandom_u32_max(nr_cpu_ids);
cpu = cpumask_next(cpu - 1, cpu_online_mask);
if (cpu >= nr_cpu_ids)
cpu = cpumask_first(cpu_online_mask);
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index 423784d9c058..96e092de5b72 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -139,7 +139,7 @@ bool should_fail(struct fault_attr *attr, ssize_t size)
return false;
}
- if (attr->probability <= prandom_u32() % 100)
+ if (attr->probability <= prandom_u32_max(100))
return false;
if (!fail_stacktrace(attr))
diff --git a/lib/find_bit_benchmark.c b/lib/find_bit_benchmark.c
index db904b57d4b8..1a6466c64bb6 100644
--- a/lib/find_bit_benchmark.c
+++ b/lib/find_bit_benchmark.c
@@ -157,8 +157,8 @@ static int __init find_bit_test(void)
bitmap_zero(bitmap2, BITMAP_LEN);
while (nbits--) {
- __set_bit(prandom_u32() % BITMAP_LEN, bitmap);
- __set_bit(prandom_u32() % BITMAP_LEN, bitmap2);
+ __set_bit(prandom_u32_max(BITMAP_LEN), bitmap);
+ __set_bit(prandom_u32_max(BITMAP_LEN), bitmap2);
}
test_find_next_bit(bitmap, BITMAP_LEN);
diff --git a/lib/kobject.c b/lib/kobject.c
index 5f0e71ab292c..a0b2dbfcfa23 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -694,7 +694,7 @@ static void kobject_release(struct kref *kref)
{
struct kobject *kobj = container_of(kref, struct kobject, kref);
#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
- unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
+ unsigned long delay = HZ + HZ * prandom_u32_max(4);
pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
kobject_name(kobj), kobj, __func__, kobj->parent, delay);
INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
diff --git a/lib/reed_solomon/test_rslib.c b/lib/reed_solomon/test_rslib.c
index d9d1c33aebda..4d241bdc88aa 100644
--- a/lib/reed_solomon/test_rslib.c
+++ b/lib/reed_solomon/test_rslib.c
@@ -183,7 +183,7 @@ static int get_rcw_we(struct rs_control *rs, struct wspace *ws,
do {
/* Must not choose the same location twice */
- errloc = prandom_u32() % len;
+ errloc = prandom_u32_max(len);
} while (errlocs[errloc] != 0);
errlocs[errloc] = 1;
@@ -194,12 +194,12 @@ static int get_rcw_we(struct rs_control *rs, struct wspace *ws,
for (i = 0; i < eras; i++) {
do {
/* Must not choose the same location twice */
- errloc = prandom_u32() % len;
+ errloc = prandom_u32_max(len);
} while (errlocs[errloc] != 0);
derrlocs[i] = errloc;
- if (ewsc && (prandom_u32() & 1)) {
+ if (ewsc && prandom_u32_max(2)) {
/* Erasure with the symbol intact */
errlocs[errloc] = 2;
} else {
diff --git a/lib/sbitmap.c b/lib/sbitmap.c
index a8108a962dfd..055dac069afb 100644
--- a/lib/sbitmap.c
+++ b/lib/sbitmap.c
@@ -33,7 +33,7 @@ static inline unsigned update_alloc_hint_before_get(struct sbitmap *sb,
hint = this_cpu_read(*sb->alloc_hint);
if (unlikely(hint >= depth)) {
- hint = depth ? prandom_u32() % depth : 0;
+ hint = depth ? prandom_u32_max(depth) : 0;
this_cpu_write(*sb->alloc_hint, hint);
}
diff --git a/lib/test-string_helpers.c b/lib/test-string_helpers.c
index 437d8e6b7cb1..86fadd3ba08c 100644
--- a/lib/test-string_helpers.c
+++ b/lib/test-string_helpers.c
@@ -587,7 +587,7 @@ static int __init test_string_helpers_init(void)
for (i = 0; i < UNESCAPE_ALL_MASK + 1; i++)
test_string_unescape("unescape", i, false);
test_string_unescape("unescape inplace",
- get_random_int() % (UNESCAPE_ANY + 1), true);
+ prandom_u32_max(UNESCAPE_ANY + 1), true);
/* Without dictionary */
for (i = 0; i < ESCAPE_ALL_MASK + 1; i++)
diff --git a/lib/test_hexdump.c b/lib/test_hexdump.c
index 5144899d3c6b..0927f44cd478 100644
--- a/lib/test_hexdump.c
+++ b/lib/test_hexdump.c
@@ -149,7 +149,7 @@ static void __init test_hexdump(size_t len, int rowsize, int groupsize,
static void __init test_hexdump_set(int rowsize, bool ascii)
{
size_t d = min_t(size_t, sizeof(data_b), rowsize);
- size_t len = get_random_int() % d + 1;
+ size_t len = prandom_u32_max(d) + 1;
test_hexdump(len, rowsize, 4, ascii);
test_hexdump(len, rowsize, 2, ascii);
@@ -208,11 +208,11 @@ static void __init test_hexdump_overflow(size_t buflen, size_t len,
static void __init test_hexdump_overflow_set(size_t buflen, bool ascii)
{
unsigned int i = 0;
- int rs = (get_random_int() % 2 + 1) * 16;
+ int rs = (prandom_u32_max(2) + 1) * 16;
do {
int gs = 1 << i;
- size_t len = get_random_int() % rs + gs;
+ size_t len = prandom_u32_max(rs) + gs;
test_hexdump_overflow(buflen, rounddown(len, gs), rs, gs, ascii);
} while (i++ < 3);
@@ -223,11 +223,11 @@ static int __init test_hexdump_init(void)
unsigned int i;
int rowsize;
- rowsize = (get_random_int() % 2 + 1) * 16;
+ rowsize = (prandom_u32_max(2) + 1) * 16;
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, false);
- rowsize = (get_random_int() % 2 + 1) * 16;
+ rowsize = (prandom_u32_max(2) + 1) * 16;
for (i = 0; i < 16; i++)
test_hexdump_set(rowsize, true);
diff --git a/lib/test_kasan.c b/lib/test_kasan.c
index 58c1b01ccfe2..7b4026623ace 100644
--- a/lib/test_kasan.c
+++ b/lib/test_kasan.c
@@ -1269,7 +1269,7 @@ static void match_all_not_assigned(struct kunit *test)
KASAN_TEST_NEEDS_CONFIG_OFF(test, CONFIG_KASAN_GENERIC);
for (i = 0; i < 256; i++) {
- size = (get_random_int() % 1024) + 1;
+ size = prandom_u32_max(1024) + 1;
ptr = kmalloc(size, GFP_KERNEL);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN);
@@ -1278,7 +1278,7 @@ static void match_all_not_assigned(struct kunit *test)
}
for (i = 0; i < 256; i++) {
- order = (get_random_int() % 4) + 1;
+ order = prandom_u32_max(4) + 1;
pages = alloc_pages(GFP_KERNEL, order);
ptr = page_address(pages);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
@@ -1291,7 +1291,7 @@ static void match_all_not_assigned(struct kunit *test)
return;
for (i = 0; i < 256; i++) {
- size = (get_random_int() % 1024) + 1;
+ size = prandom_u32_max(1024) + 1;
ptr = vmalloc(size);
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, ptr);
KUNIT_EXPECT_GE(test, (u8)get_tag(ptr), (u8)KASAN_TAG_MIN);
diff --git a/lib/test_list_sort.c b/lib/test_list_sort.c
index ade7a1ea0c8e..19ff229b9c3a 100644
--- a/lib/test_list_sort.c
+++ b/lib/test_list_sort.c
@@ -71,7 +71,7 @@ static void list_sort_test(struct kunit *test)
KUNIT_ASSERT_NOT_ERR_OR_NULL(test, el);
/* force some equivalencies */
- el->value = prandom_u32() % (TEST_LIST_LEN / 3);
+ el->value = prandom_u32_max(TEST_LIST_LEN / 3);
el->serial = i;
el->poison1 = TEST_POISON1;
el->poison2 = TEST_POISON2;
diff --git a/mm/migrate.c b/mm/migrate.c
index 6a1597c92261..db04f95fe050 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2292,7 +2292,7 @@ int next_demotion_node(int node)
* caching issue, which seems more complicated. So selecting
* target node randomly seems better until now.
*/
- index = get_random_int() % target_nr;
+ index = prandom_u32_max(target_nr);
break;
}
diff --git a/mm/slub.c b/mm/slub.c
index 2a6b3f31ce7e..820c6801d594 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -1868,7 +1868,7 @@ static bool shuffle_freelist(struct kmem_cache *s, struct slab *slab)
return false;
freelist_count = oo_objects(s->oo);
- pos = get_random_int() % freelist_count;
+ pos = prandom_u32_max(freelist_count);
page_limit = slab->objects * s->size;
start = fixup_red_left(s, slab_address(slab));
diff --git a/net/802/garp.c b/net/802/garp.c
index f6012f8e59f0..fc9eb02a912f 100644
--- a/net/802/garp.c
+++ b/net/802/garp.c
@@ -407,7 +407,7 @@ static void garp_join_timer_arm(struct garp_applicant *app)
{
unsigned long delay;
- delay = (u64)msecs_to_jiffies(garp_join_time) * prandom_u32() >> 32;
+ delay = prandom_u32_max(msecs_to_jiffies(garp_join_time));
mod_timer(&app->join_timer, jiffies + delay);
}
diff --git a/net/802/mrp.c b/net/802/mrp.c
index 35e04cc5390c..155f74d8b14f 100644
--- a/net/802/mrp.c
+++ b/net/802/mrp.c
@@ -592,7 +592,7 @@ static void mrp_join_timer_arm(struct mrp_applicant *app)
{
unsigned long delay;
- delay = (u64)msecs_to_jiffies(mrp_join_time) * prandom_u32() >> 32;
+ delay = prandom_u32_max(msecs_to_jiffies(mrp_join_time));
mod_timer(&app->join_timer, jiffies + delay);
}
diff --git a/net/ceph/mon_client.c b/net/ceph/mon_client.c
index 6a6898ee4049..db60217f911b 100644
--- a/net/ceph/mon_client.c
+++ b/net/ceph/mon_client.c
@@ -222,7 +222,7 @@ static void pick_new_mon(struct ceph_mon_client *monc)
max--;
}
- n = prandom_u32() % max;
+ n = prandom_u32_max(max);
if (o >= 0 && n >= o)
n++;
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 87b883c7bfd6..4e4f1e4bc265 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -1479,7 +1479,7 @@ static bool target_should_be_paused(struct ceph_osd_client *osdc,
static int pick_random_replica(const struct ceph_osds *acting)
{
- int i = prandom_u32() % acting->size;
+ int i = prandom_u32_max(acting->size);
dout("%s picked osd%d, primary osd%d\n", __func__,
acting->osds[i], acting->primary);
diff --git a/net/core/neighbour.c b/net/core/neighbour.c
index e93edb810103..3c4786b99907 100644
--- a/net/core/neighbour.c
+++ b/net/core/neighbour.c
@@ -111,7 +111,7 @@ static void neigh_cleanup_and_release(struct neighbour *neigh)
unsigned long neigh_rand_reach_time(unsigned long base)
{
- return base ? (prandom_u32() % base) + (base >> 1) : 0;
+ return base ? prandom_u32_max(base) + (base >> 1) : 0;
}
EXPORT_SYMBOL(neigh_rand_reach_time);
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index 88906ba6d9a7..5ca4f953034c 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -2324,7 +2324,7 @@ static inline int f_pick(struct pktgen_dev *pkt_dev)
pkt_dev->curfl = 0; /*reset */
}
} else {
- flow = prandom_u32() % pkt_dev->cflows;
+ flow = prandom_u32_max(pkt_dev->cflows);
pkt_dev->curfl = flow;
if (pkt_dev->flows[flow].count > pkt_dev->lflow) {
@@ -2380,10 +2380,9 @@ static void set_cur_queue_map(struct pktgen_dev *pkt_dev)
else if (pkt_dev->queue_map_min <= pkt_dev->queue_map_max) {
__u16 t;
if (pkt_dev->flags & F_QUEUE_MAP_RND) {
- t = prandom_u32() %
- (pkt_dev->queue_map_max -
- pkt_dev->queue_map_min + 1)
- + pkt_dev->queue_map_min;
+ t = prandom_u32_max(pkt_dev->queue_map_max -
+ pkt_dev->queue_map_min + 1) +
+ pkt_dev->queue_map_min;
} else {
t = pkt_dev->cur_queue_map + 1;
if (t > pkt_dev->queue_map_max)
@@ -2412,7 +2411,7 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
__u32 tmp;
if (pkt_dev->flags & F_MACSRC_RND)
- mc = prandom_u32() % pkt_dev->src_mac_count;
+ mc = prandom_u32_max(pkt_dev->src_mac_count);
else {
mc = pkt_dev->cur_src_mac_offset++;
if (pkt_dev->cur_src_mac_offset >=
@@ -2438,7 +2437,7 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
__u32 tmp;
if (pkt_dev->flags & F_MACDST_RND)
- mc = prandom_u32() % pkt_dev->dst_mac_count;
+ mc = prandom_u32_max(pkt_dev->dst_mac_count);
else {
mc = pkt_dev->cur_dst_mac_offset++;
@@ -2470,18 +2469,18 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
}
if ((pkt_dev->flags & F_VID_RND) && (pkt_dev->vlan_id != 0xffff)) {
- pkt_dev->vlan_id = prandom_u32() & (4096 - 1);
+ pkt_dev->vlan_id = prandom_u32_max(4096);
}
if ((pkt_dev->flags & F_SVID_RND) && (pkt_dev->svlan_id != 0xffff)) {
- pkt_dev->svlan_id = prandom_u32() & (4096 - 1);
+ pkt_dev->svlan_id = prandom_u32_max(4096);
}
if (pkt_dev->udp_src_min < pkt_dev->udp_src_max) {
if (pkt_dev->flags & F_UDPSRC_RND)
- pkt_dev->cur_udp_src = prandom_u32() %
- (pkt_dev->udp_src_max - pkt_dev->udp_src_min)
- + pkt_dev->udp_src_min;
+ pkt_dev->cur_udp_src = prandom_u32_max(
+ pkt_dev->udp_src_max - pkt_dev->udp_src_min) +
+ pkt_dev->udp_src_min;
else {
pkt_dev->cur_udp_src++;
@@ -2492,9 +2491,9 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
if (pkt_dev->udp_dst_min < pkt_dev->udp_dst_max) {
if (pkt_dev->flags & F_UDPDST_RND) {
- pkt_dev->cur_udp_dst = prandom_u32() %
- (pkt_dev->udp_dst_max - pkt_dev->udp_dst_min)
- + pkt_dev->udp_dst_min;
+ pkt_dev->cur_udp_dst = prandom_u32_max(
+ pkt_dev->udp_dst_max - pkt_dev->udp_dst_min) +
+ pkt_dev->udp_dst_min;
} else {
pkt_dev->cur_udp_dst++;
if (pkt_dev->cur_udp_dst >= pkt_dev->udp_dst_max)
@@ -2509,7 +2508,7 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
if (imn < imx) {
__u32 t;
if (pkt_dev->flags & F_IPSRC_RND)
- t = prandom_u32() % (imx - imn) + imn;
+ t = prandom_u32_max(imx - imn) + imn;
else {
t = ntohl(pkt_dev->cur_saddr);
t++;
@@ -2531,8 +2530,8 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
if (pkt_dev->flags & F_IPDST_RND) {
do {
- t = prandom_u32() %
- (imx - imn) + imn;
+ t = prandom_u32_max(imx - imn) +
+ imn;
s = htonl(t);
} while (ipv4_is_loopback(s) ||
ipv4_is_multicast(s) ||
@@ -2579,9 +2578,9 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
if (pkt_dev->min_pkt_size < pkt_dev->max_pkt_size) {
__u32 t;
if (pkt_dev->flags & F_TXSIZE_RND) {
- t = prandom_u32() %
- (pkt_dev->max_pkt_size - pkt_dev->min_pkt_size)
- + pkt_dev->min_pkt_size;
+ t = prandom_u32_max(pkt_dev->max_pkt_size -
+ pkt_dev->min_pkt_size) +
+ pkt_dev->min_pkt_size;
} else {
t = pkt_dev->cur_pkt_size + 1;
if (t > pkt_dev->max_pkt_size)
@@ -2590,7 +2589,7 @@ static void mod_cur_headers(struct pktgen_dev *pkt_dev)
pkt_dev->cur_pkt_size = t;
} else if (pkt_dev->n_imix_entries > 0) {
struct imix_pkt *entry;
- __u32 t = prandom_u32() % IMIX_PRECISION;
+ __u32 t = prandom_u32_max(IMIX_PRECISION);
__u8 entry_index = pkt_dev->imix_distribution[t];
entry = &pkt_dev->imix_entries[entry_index];
diff --git a/net/core/stream.c b/net/core/stream.c
index 1105057ce00a..75fded8495f5 100644
--- a/net/core/stream.c
+++ b/net/core/stream.c
@@ -123,7 +123,7 @@ int sk_stream_wait_memory(struct sock *sk, long *timeo_p)
DEFINE_WAIT_FUNC(wait, woken_wake_function);
if (sk_stream_memory_free(sk))
- current_timeo = vm_wait = (prandom_u32() % (HZ / 5)) + 2;
+ current_timeo = vm_wait = prandom_u32_max(HZ / 5) + 2;
add_wait_queue(sk_sleep(sk), &wait);
diff --git a/net/ipv4/igmp.c b/net/ipv4/igmp.c
index df0660d818ac..81be3e0f0e70 100644
--- a/net/ipv4/igmp.c
+++ b/net/ipv4/igmp.c
@@ -213,7 +213,7 @@ static void igmp_stop_timer(struct ip_mc_list *im)
/* It must be called with locked im->lock */
static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
{
- int tv = prandom_u32() % max_delay;
+ int tv = prandom_u32_max(max_delay);
im->tm_running = 1;
if (!mod_timer(&im->timer, jiffies+tv+2))
@@ -222,7 +222,7 @@ static void igmp_start_timer(struct ip_mc_list *im, int max_delay)
static void igmp_gq_start_timer(struct in_device *in_dev)
{
- int tv = prandom_u32() % in_dev->mr_maxdelay;
+ int tv = prandom_u32_max(in_dev->mr_maxdelay);
unsigned long exp = jiffies + tv + 2;
if (in_dev->mr_gq_running &&
@@ -236,7 +236,7 @@ static void igmp_gq_start_timer(struct in_device *in_dev)
static void igmp_ifc_start_timer(struct in_device *in_dev, int delay)
{
- int tv = prandom_u32() % delay;
+ int tv = prandom_u32_max(delay);
if (!mod_timer(&in_dev->mr_ifc_timer, jiffies+tv+2))
in_dev_hold(in_dev);
diff --git a/net/ipv4/inet_connection_sock.c b/net/ipv4/inet_connection_sock.c
index ebca860e113f..4e84ed21d16f 100644
--- a/net/ipv4/inet_connection_sock.c
+++ b/net/ipv4/inet_connection_sock.c
@@ -314,7 +314,7 @@ inet_csk_find_open_port(const struct sock *sk, struct inet_bind_bucket **tb_ret,
if (likely(remaining > 1))
remaining &= ~1U;
- offset = prandom_u32() % remaining;
+ offset = prandom_u32_max(remaining);
/* __inet_hash_connect() favors ports having @low parity
* We do the opposite to not pollute connect() users.
*/
diff --git a/net/ipv4/inet_hashtables.c b/net/ipv4/inet_hashtables.c
index a0ad34e4f044..d3dc28156622 100644
--- a/net/ipv4/inet_hashtables.c
+++ b/net/ipv4/inet_hashtables.c
@@ -1037,7 +1037,7 @@ int __inet_hash_connect(struct inet_timewait_death_row *death_row,
* on low contention the randomness is maximal and on high contention
* it may be inexistent.
*/
- i = max_t(int, i, (prandom_u32() & 7) * 2);
+ i = max_t(int, i, prandom_u32_max(8) * 2);
WRITE_ONCE(table_perturb[index], READ_ONCE(table_perturb[index]) + i + 2);
/* Head lock still held and bh's disabled */
diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 10ce86bf228e..417834b7169d 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -104,7 +104,7 @@ static inline u32 cstamp_delta(unsigned long cstamp)
static inline s32 rfc3315_s14_backoff_init(s32 irt)
{
/* multiply 'initial retransmission time' by 0.9 .. 1.1 */
- u64 tmp = (900000 + prandom_u32() % 200001) * (u64)irt;
+ u64 tmp = (900000 + prandom_u32_max(200001)) * (u64)irt;
do_div(tmp, 1000000);
return (s32)tmp;
}
@@ -112,11 +112,11 @@ static inline s32 rfc3315_s14_backoff_init(s32 irt)
static inline s32 rfc3315_s14_backoff_update(s32 rt, s32 mrt)
{
/* multiply 'retransmission timeout' by 1.9 .. 2.1 */
- u64 tmp = (1900000 + prandom_u32() % 200001) * (u64)rt;
+ u64 tmp = (1900000 + prandom_u32_max(200001)) * (u64)rt;
do_div(tmp, 1000000);
if ((s32)tmp > mrt) {
/* multiply 'maximum retransmission time' by 0.9 .. 1.1 */
- tmp = (900000 + prandom_u32() % 200001) * (u64)mrt;
+ tmp = (900000 + prandom_u32_max(200001)) * (u64)mrt;
do_div(tmp, 1000000);
}
return (s32)tmp;
@@ -3967,7 +3967,7 @@ static void addrconf_dad_kick(struct inet6_ifaddr *ifp)
if (ifp->flags & IFA_F_OPTIMISTIC)
rand_num = 0;
else
- rand_num = prandom_u32() % (idev->cnf.rtr_solicit_delay ? : 1);
+ rand_num = prandom_u32_max(idev->cnf.rtr_solicit_delay ?: 1);
nonce = 0;
if (idev->cnf.enhanced_dad ||
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 0566ab03ddbe..7860383295d8 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -1050,7 +1050,7 @@ bool ipv6_chk_mcast_addr(struct net_device *dev, const struct in6_addr *group,
/* called with mc_lock */
static void mld_gq_start_work(struct inet6_dev *idev)
{
- unsigned long tv = prandom_u32() % idev->mc_maxdelay;
+ unsigned long tv = prandom_u32_max(idev->mc_maxdelay);
idev->mc_gq_running = 1;
if (!mod_delayed_work(mld_wq, &idev->mc_gq_work, tv + 2))
@@ -1068,7 +1068,7 @@ static void mld_gq_stop_work(struct inet6_dev *idev)
/* called with mc_lock */
static void mld_ifc_start_work(struct inet6_dev *idev, unsigned long delay)
{
- unsigned long tv = prandom_u32() % delay;
+ unsigned long tv = prandom_u32_max(delay);
if (!mod_delayed_work(mld_wq, &idev->mc_ifc_work, tv + 2))
in6_dev_hold(idev);
@@ -1085,7 +1085,7 @@ static void mld_ifc_stop_work(struct inet6_dev *idev)
/* called with mc_lock */
static void mld_dad_start_work(struct inet6_dev *idev, unsigned long delay)
{
- unsigned long tv = prandom_u32() % delay;
+ unsigned long tv = prandom_u32_max(delay);
if (!mod_delayed_work(mld_wq, &idev->mc_dad_work, tv + 2))
in6_dev_hold(idev);
@@ -1130,7 +1130,7 @@ static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
}
if (delay >= resptime)
- delay = prandom_u32() % resptime;
+ delay = prandom_u32_max(resptime);
if (!mod_delayed_work(mld_wq, &ma->mca_work, delay))
refcount_inc(&ma->mca_refcnt);
@@ -2574,7 +2574,7 @@ static void igmp6_join_group(struct ifmcaddr6 *ma)
igmp6_send(&ma->mca_addr, ma->idev->dev, ICMPV6_MGM_REPORT);
- delay = prandom_u32() % unsolicited_report_interval(ma->idev);
+ delay = prandom_u32_max(unsolicited_report_interval(ma->idev));
if (cancel_delayed_work(&ma->mca_work)) {
refcount_dec(&ma->mca_refcnt);
diff --git a/net/netfilter/ipvs/ip_vs_twos.c b/net/netfilter/ipvs/ip_vs_twos.c
index acb55d8393ef..f2579fc9c75b 100644
--- a/net/netfilter/ipvs/ip_vs_twos.c
+++ b/net/netfilter/ipvs/ip_vs_twos.c
@@ -71,8 +71,8 @@ static struct ip_vs_dest *ip_vs_twos_schedule(struct ip_vs_service *svc,
* from 0 to total_weight
*/
total_weight += 1;
- rweight1 = prandom_u32() % total_weight;
- rweight2 = prandom_u32() % total_weight;
+ rweight1 = prandom_u32_max(total_weight);
+ rweight2 = prandom_u32_max(total_weight);
/* Pick two weighted servers */
list_for_each_entry_rcu(dest, &svc->destinations, n_list) {
diff --git a/net/packet/af_packet.c b/net/packet/af_packet.c
index d3f6db350de7..6ce8dd19f33c 100644
--- a/net/packet/af_packet.c
+++ b/net/packet/af_packet.c
@@ -1350,7 +1350,7 @@ static bool fanout_flow_is_huge(struct packet_sock *po, struct sk_buff *skb)
if (READ_ONCE(history[i]) == rxhash)
count++;
- victim = prandom_u32() % ROLLOVER_HLEN;
+ victim = prandom_u32_max(ROLLOVER_HLEN);
/* Avoid dirtying the cache line if possible */
if (READ_ONCE(history[victim]) != rxhash)
diff --git a/net/sched/act_gact.c b/net/sched/act_gact.c
index abe1bcc5c797..62d682b96b88 100644
--- a/net/sched/act_gact.c
+++ b/net/sched/act_gact.c
@@ -25,7 +25,7 @@ static struct tc_action_ops act_gact_ops;
static int gact_net_rand(struct tcf_gact *gact)
{
smp_rmb(); /* coupled with smp_wmb() in tcf_gact_init() */
- if (prandom_u32() % gact->tcfg_pval)
+ if (prandom_u32_max(gact->tcfg_pval))
return gact->tcf_action;
return gact->tcfg_paction;
}
diff --git a/net/sched/act_sample.c b/net/sched/act_sample.c
index 5ba36f70e3a1..7a25477f5d99 100644
--- a/net/sched/act_sample.c
+++ b/net/sched/act_sample.c
@@ -168,7 +168,7 @@ static int tcf_sample_act(struct sk_buff *skb, const struct tc_action *a,
psample_group = rcu_dereference_bh(s->psample_group);
/* randomly sample packets according to rate */
- if (psample_group && (prandom_u32() % s->rate == 0)) {
+ if (psample_group && (prandom_u32_max(s->rate) == 0)) {
if (!skb_at_tc_ingress(skb)) {
md.in_ifindex = skb->skb_iif;
md.out_ifindex = skb->dev->ifindex;
diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index 18f4273a835b..bab45b3b1fdb 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -513,8 +513,8 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch,
goto finish_segs;
}
- skb->data[prandom_u32() % skb_headlen(skb)] ^=
- 1<<(prandom_u32() % 8);
+ skb->data[prandom_u32_max(skb_headlen(skb))] ^=
+ 1<<prandom_u32_max(8);
}
if (unlikely(sch->q.qlen >= sch->limit)) {
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 171f1a35d205..1e354ba44960 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -8319,7 +8319,7 @@ static int sctp_get_port_local(struct sock *sk, union sctp_addr *addr)
inet_get_local_port_range(net, &low, &high);
remaining = (high - low) + 1;
- rover = prandom_u32() % remaining + low;
+ rover = prandom_u32_max(remaining) + low;
do {
rover++;
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index c3c693b51c94..f075a9fb5ccc 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -677,7 +677,7 @@ static void cache_limit_defers(void)
/* Consider removing either the first or the last */
if (cache_defer_cnt > DFR_MAX) {
- if (prandom_u32() & 1)
+ if (prandom_u32_max(2))
discard = list_entry(cache_defer_list.next,
struct cache_deferred_req, recent);
else
diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c
index e976007f4fd0..f55ff5155b6e 100644
--- a/net/sunrpc/xprtsock.c
+++ b/net/sunrpc/xprtsock.c
@@ -1619,7 +1619,7 @@ static int xs_get_random_port(void)
if (max < min)
return -EADDRINUSE;
range = max - min + 1;
- rand = (unsigned short) prandom_u32() % range;
+ rand = prandom_u32_max(range);
return rand + min;
}
diff --git a/net/tipc/socket.c b/net/tipc/socket.c
index f1c3b8eb4b3d..e902b01ea3cb 100644
--- a/net/tipc/socket.c
+++ b/net/tipc/socket.c
@@ -3010,7 +3010,7 @@ static int tipc_sk_insert(struct tipc_sock *tsk)
struct net *net = sock_net(sk);
struct tipc_net *tn = net_generic(net, tipc_net_id);
u32 remaining = (TIPC_MAX_PORT - TIPC_MIN_PORT) + 1;
- u32 portid = prandom_u32() % remaining + TIPC_MIN_PORT;
+ u32 portid = prandom_u32_max(remaining) + TIPC_MIN_PORT;
while (remaining--) {
portid++;
diff --git a/net/xfrm/xfrm_state.c b/net/xfrm/xfrm_state.c
index 81df34b3da6e..3d2fe7712ac5 100644
--- a/net/xfrm/xfrm_state.c
+++ b/net/xfrm/xfrm_state.c
@@ -2072,7 +2072,7 @@ int xfrm_alloc_spi(struct xfrm_state *x, u32 low, u32 high)
} else {
u32 spi = 0;
for (h = 0; h < high-low+1; h++) {
- spi = low + prandom_u32()%(high-low+1);
+ spi = low + prandom_u32_max(high - low + 1);
x0 = xfrm_state_lookup(net, mark, &x->id.daddr, htonl(spi), x->id.proto, x->props.family);
if (x0 == NULL) {
newspi = htonl(spi);
--
2.37.3
Rather than incurring a division or requesting too many random bytes for
the given range, use the prandom_u32_max() function, which only takes
the minimum required bytes from the RNG and avoids divisions. This was
done by hand, covering things that coccinelle could not do on its own.
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Yury Norov <[email protected]>
Reviewed-by: Jan Kara <[email protected]> # for ext2, ext4, and sbitmap
Signed-off-by: Jason A. Donenfeld <[email protected]>
---
fs/ext2/ialloc.c | 3 +--
fs/ext4/ialloc.c | 5 ++---
lib/sbitmap.c | 2 +-
lib/test_vmalloc.c | 17 ++++-------------
4 files changed, 8 insertions(+), 19 deletions(-)
diff --git a/fs/ext2/ialloc.c b/fs/ext2/ialloc.c
index 998dd2ac8008..f4944c4dee60 100644
--- a/fs/ext2/ialloc.c
+++ b/fs/ext2/ialloc.c
@@ -277,8 +277,7 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent)
int best_ndir = inodes_per_group;
int best_group = -1;
- group = prandom_u32();
- parent_group = (unsigned)group % ngroups;
+ parent_group = prandom_u32_max(ngroups);
for (i = 0; i < ngroups; i++) {
group = (parent_group + i) % ngroups;
desc = ext2_get_group_desc (sb, group, NULL);
diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
index 208b87ce8858..7575aa359675 100644
--- a/fs/ext4/ialloc.c
+++ b/fs/ext4/ialloc.c
@@ -463,10 +463,9 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
hinfo.hash_version = DX_HASH_HALF_MD4;
hinfo.seed = sbi->s_hash_seed;
ext4fs_dirhash(parent, qstr->name, qstr->len, &hinfo);
- grp = hinfo.hash;
+ parent_group = hinfo.hash % ngroups;
} else
- grp = prandom_u32();
- parent_group = (unsigned)grp % ngroups;
+ parent_group = prandom_u32_max(ngroups);
for (i = 0; i < ngroups; i++) {
g = (parent_group + i) % ngroups;
get_orlov_stats(sb, g, flex_size, &stats);
diff --git a/lib/sbitmap.c b/lib/sbitmap.c
index 055dac069afb..7280ae8ca88c 100644
--- a/lib/sbitmap.c
+++ b/lib/sbitmap.c
@@ -21,7 +21,7 @@ static int init_alloc_hint(struct sbitmap *sb, gfp_t flags)
int i;
for_each_possible_cpu(i)
- *per_cpu_ptr(sb->alloc_hint, i) = prandom_u32() % depth;
+ *per_cpu_ptr(sb->alloc_hint, i) = prandom_u32_max(depth);
}
return 0;
}
diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c
index 4f2f2d1bac56..a26bbbf20e62 100644
--- a/lib/test_vmalloc.c
+++ b/lib/test_vmalloc.c
@@ -151,9 +151,7 @@ static int random_size_alloc_test(void)
int i;
for (i = 0; i < test_loop_count; i++) {
- n = prandom_u32();
- n = (n % 100) + 1;
-
+ n = prandom_u32_max(100) + 1;
p = vmalloc(n * PAGE_SIZE);
if (!p)
@@ -293,16 +291,12 @@ pcpu_alloc_test(void)
return -1;
for (i = 0; i < 35000; i++) {
- unsigned int r;
-
- r = prandom_u32();
- size = (r % (PAGE_SIZE / 4)) + 1;
+ size = prandom_u32_max(PAGE_SIZE / 4) + 1;
/*
* Maximum PAGE_SIZE
*/
- r = prandom_u32();
- align = 1 << ((r % 11) + 1);
+ align = 1 << (prandom_u32_max(11) + 1);
pcpu[i] = __alloc_percpu(size, align);
if (!pcpu[i])
@@ -393,14 +387,11 @@ static struct test_driver {
static void shuffle_array(int *arr, int n)
{
- unsigned int rnd;
int i, j;
for (i = n - 1; i > 0; i--) {
- rnd = prandom_u32();
-
/* Cut the range. */
- j = rnd % i;
+ j = prandom_u32_max(i);
/* Swap indexes. */
swap(arr[i], arr[j]);
--
2.37.3
Rather than truncate a 32-bit value to a 16-bit value or an 8-bit value,
simply use the get_random_{u8,u16}() functions, which are faster than
wasting the additional bytes from a 32-bit value. This was done
mechanically with this coccinelle script:
@@
expression E;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u16;
typedef __be16;
typedef __le16;
typedef u8;
@@
(
- (get_random_u32() & 0xffff)
+ get_random_u16()
|
- (get_random_u32() & 0xff)
+ get_random_u8()
|
- (get_random_u32() % 65536)
+ get_random_u16()
|
- (get_random_u32() % 256)
+ get_random_u8()
|
- (get_random_u32() >> 16)
+ get_random_u16()
|
- (get_random_u32() >> 24)
+ get_random_u8()
|
- (u16)get_random_u32()
+ get_random_u16()
|
- (u8)get_random_u32()
+ get_random_u8()
|
- (__be16)get_random_u32()
+ (__be16)get_random_u16()
|
- (__le16)get_random_u32()
+ (__le16)get_random_u16()
|
- prandom_u32_max(65536)
+ get_random_u16()
|
- prandom_u32_max(256)
+ get_random_u8()
|
- E->inet_id = get_random_u32()
+ E->inet_id = get_random_u16()
)
@@
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u16;
identifier v;
@@
- u16 v = get_random_u32();
+ u16 v = get_random_u16();
@@
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u8;
identifier v;
@@
- u8 v = get_random_u32();
+ u8 v = get_random_u8();
@@
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u16;
u16 v;
@@
- v = get_random_u32();
+ v = get_random_u16();
@@
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u8;
u8 v;
@@
- v = get_random_u32();
+ v = get_random_u8();
// Find a potential literal
@literal_mask@
expression LITERAL;
type T;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
position p;
@@
((T)get_random_u32()@p & (LITERAL))
// Examine limits
@script:python add_one@
literal << literal_mask.LITERAL;
RESULT;
@@
value = None
if literal.startswith('0x'):
value = int(literal, 16)
elif literal[0] in '123456789':
value = int(literal, 10)
if value is None:
print("I don't know how to handle %s" % (literal))
cocci.include_match(False)
elif value < 256:
coccinelle.RESULT = cocci.make_ident("get_random_u8")
elif value < 65536:
coccinelle.RESULT = cocci.make_ident("get_random_u16")
else:
print("Skipping large mask of %s" % (literal))
cocci.include_match(False)
// Replace the literal mask with the calculated result.
@plus_one@
expression literal_mask.LITERAL;
position literal_mask.p;
identifier add_one.RESULT;
identifier FUNC;
@@
- (FUNC()@p & (LITERAL))
+ (RESULT() & LITERAL)
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Yury Norov <[email protected]>
Acked-by: Toke Høiland-Jørgensen <[email protected]> # for sch_cake
Signed-off-by: Jason A. Donenfeld <[email protected]>
---
arch/arm/kernel/signal.c | 2 +-
arch/arm64/kernel/syscall.c | 2 +-
crypto/testmgr.c | 8 ++++----
drivers/media/common/v4l2-tpg/v4l2-tpg-core.c | 2 +-
drivers/media/test-drivers/vivid/vivid-radio-rx.c | 4 ++--
.../net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c | 2 +-
drivers/net/hamradio/baycom_epp.c | 2 +-
drivers/net/hamradio/hdlcdrv.c | 2 +-
drivers/net/hamradio/yam.c | 2 +-
drivers/net/wireguard/selftest/allowedips.c | 4 ++--
drivers/net/wireless/st/cw1200/wsm.c | 2 +-
drivers/scsi/lpfc/lpfc_hbadisc.c | 6 +++---
lib/cmdline_kunit.c | 4 ++--
net/dccp/ipv4.c | 4 ++--
net/ipv4/datagram.c | 2 +-
net/ipv4/ip_output.c | 2 +-
net/ipv4/tcp_ipv4.c | 4 ++--
net/mac80211/scan.c | 2 +-
net/netfilter/nf_nat_core.c | 4 ++--
net/sched/sch_cake.c | 6 +++---
net/sctp/socket.c | 2 +-
21 files changed, 34 insertions(+), 34 deletions(-)
diff --git a/arch/arm/kernel/signal.c b/arch/arm/kernel/signal.c
index ea128e32e8ca..e07f359254c3 100644
--- a/arch/arm/kernel/signal.c
+++ b/arch/arm/kernel/signal.c
@@ -655,7 +655,7 @@ struct page *get_signal_page(void)
PAGE_SIZE / sizeof(u32));
/* Give the signal return code some randomness */
- offset = 0x200 + (get_random_int() & 0x7fc);
+ offset = 0x200 + (get_random_u16() & 0x7fc);
signal_return_offset = offset;
/* Copy signal return handlers into the page */
diff --git a/arch/arm64/kernel/syscall.c b/arch/arm64/kernel/syscall.c
index 733451fe7e41..d72e8f23422d 100644
--- a/arch/arm64/kernel/syscall.c
+++ b/arch/arm64/kernel/syscall.c
@@ -67,7 +67,7 @@ static void invoke_syscall(struct pt_regs *regs, unsigned int scno,
*
* The resulting 5 bits of entropy is seen in SP[8:4].
*/
- choose_random_kstack_offset(get_random_int() & 0x1FF);
+ choose_random_kstack_offset(get_random_u16() & 0x1FF);
}
static inline bool has_syscall_work(unsigned long flags)
diff --git a/crypto/testmgr.c b/crypto/testmgr.c
index be45217acde4..981c637fa2ed 100644
--- a/crypto/testmgr.c
+++ b/crypto/testmgr.c
@@ -927,7 +927,7 @@ static void generate_random_bytes(u8 *buf, size_t count)
b = 0xff;
break;
default:
- b = (u8)prandom_u32();
+ b = get_random_u8();
break;
}
memset(buf, b, count);
@@ -935,8 +935,8 @@ static void generate_random_bytes(u8 *buf, size_t count)
break;
case 2:
/* Ascending or descending bytes, plus optional mutations */
- increment = (u8)prandom_u32();
- b = (u8)prandom_u32();
+ increment = get_random_u8();
+ b = get_random_u8();
for (i = 0; i < count; i++, b += increment)
buf[i] = b;
mutate_buffer(buf, count);
@@ -944,7 +944,7 @@ static void generate_random_bytes(u8 *buf, size_t count)
default:
/* Fully random bytes */
for (i = 0; i < count; i++)
- buf[i] = (u8)prandom_u32();
+ buf[i] = get_random_u8();
}
}
diff --git a/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c b/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
index 9b7bcdce6e44..303d02b1d71c 100644
--- a/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
+++ b/drivers/media/common/v4l2-tpg/v4l2-tpg-core.c
@@ -870,7 +870,7 @@ static void precalculate_color(struct tpg_data *tpg, int k)
g = tpg_colors[col].g;
b = tpg_colors[col].b;
} else if (tpg->pattern == TPG_PAT_NOISE) {
- r = g = b = prandom_u32_max(256);
+ r = g = b = get_random_u8();
} else if (k == TPG_COLOR_RANDOM) {
r = g = b = tpg->qual_offset + prandom_u32_max(196);
} else if (k >= TPG_COLOR_RAMP) {
diff --git a/drivers/media/test-drivers/vivid/vivid-radio-rx.c b/drivers/media/test-drivers/vivid/vivid-radio-rx.c
index 232cab508f48..8bd09589fb15 100644
--- a/drivers/media/test-drivers/vivid/vivid-radio-rx.c
+++ b/drivers/media/test-drivers/vivid/vivid-radio-rx.c
@@ -104,8 +104,8 @@ ssize_t vivid_radio_rx_read(struct file *file, char __user *buf,
break;
case 2:
rds.block |= V4L2_RDS_BLOCK_ERROR;
- rds.lsb = prandom_u32_max(256);
- rds.msb = prandom_u32_max(256);
+ rds.lsb = get_random_u8();
+ rds.msb = get_random_u8();
break;
case 3: /* Skip block altogether */
if (i)
diff --git a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
index f90bfba4b303..eda129d0143e 100644
--- a/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
+++ b/drivers/net/ethernet/chelsio/inline_crypto/chtls/chtls_cm.c
@@ -1466,7 +1466,7 @@ static void make_established(struct sock *sk, u32 snd_isn, unsigned int opt)
tp->write_seq = snd_isn;
tp->snd_nxt = snd_isn;
tp->snd_una = snd_isn;
- inet_sk(sk)->inet_id = prandom_u32();
+ inet_sk(sk)->inet_id = get_random_u16();
assign_rxopt(sk, opt);
if (tp->rcv_wnd > (RCV_BUFSIZ_M << 10))
diff --git a/drivers/net/hamradio/baycom_epp.c b/drivers/net/hamradio/baycom_epp.c
index 7df78a721b04..791b4a53d69f 100644
--- a/drivers/net/hamradio/baycom_epp.c
+++ b/drivers/net/hamradio/baycom_epp.c
@@ -438,7 +438,7 @@ static int transmit(struct baycom_state *bc, int cnt, unsigned char stat)
if ((--bc->hdlctx.slotcnt) > 0)
return 0;
bc->hdlctx.slotcnt = bc->ch_params.slottime;
- if (prandom_u32_max(256) > bc->ch_params.ppersist)
+ if (get_random_u8() > bc->ch_params.ppersist)
return 0;
}
}
diff --git a/drivers/net/hamradio/hdlcdrv.c b/drivers/net/hamradio/hdlcdrv.c
index bef904325a0f..2263029d1a20 100644
--- a/drivers/net/hamradio/hdlcdrv.c
+++ b/drivers/net/hamradio/hdlcdrv.c
@@ -377,7 +377,7 @@ void hdlcdrv_arbitrate(struct net_device *dev, struct hdlcdrv_state *s)
if ((--s->hdlctx.slotcnt) > 0)
return;
s->hdlctx.slotcnt = s->ch_params.slottime;
- if (prandom_u32_max(256) > s->ch_params.ppersist)
+ if (get_random_u8() > s->ch_params.ppersist)
return;
start_tx(dev, s);
}
diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index 97a6cc5c7ae8..2ed2f836f09a 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -626,7 +626,7 @@ static void yam_arbitrate(struct net_device *dev)
yp->slotcnt = yp->slot / 10;
/* is random > persist ? */
- if (prandom_u32_max(256) > yp->pers)
+ if (get_random_u8() > yp->pers)
return;
yam_start_tx(dev, yp);
diff --git a/drivers/net/wireguard/selftest/allowedips.c b/drivers/net/wireguard/selftest/allowedips.c
index 41db10f9be49..dd897c0740a2 100644
--- a/drivers/net/wireguard/selftest/allowedips.c
+++ b/drivers/net/wireguard/selftest/allowedips.c
@@ -310,7 +310,7 @@ static __init bool randomized_test(void)
for (k = 0; k < 4; ++k)
mutated[k] = (mutated[k] & mutate_mask[k]) |
(~mutate_mask[k] &
- prandom_u32_max(256));
+ get_random_u8());
cidr = prandom_u32_max(32) + 1;
peer = peers[prandom_u32_max(NUM_PEERS)];
if (wg_allowedips_insert_v4(&t,
@@ -354,7 +354,7 @@ static __init bool randomized_test(void)
for (k = 0; k < 4; ++k)
mutated[k] = (mutated[k] & mutate_mask[k]) |
(~mutate_mask[k] &
- prandom_u32_max(256));
+ get_random_u8());
cidr = prandom_u32_max(128) + 1;
peer = peers[prandom_u32_max(NUM_PEERS)];
if (wg_allowedips_insert_v6(&t,
diff --git a/drivers/net/wireless/st/cw1200/wsm.c b/drivers/net/wireless/st/cw1200/wsm.c
index 5a3e7a626702..4a9e4b5d3547 100644
--- a/drivers/net/wireless/st/cw1200/wsm.c
+++ b/drivers/net/wireless/st/cw1200/wsm.c
@@ -1594,7 +1594,7 @@ static int cw1200_get_prio_queue(struct cw1200_common *priv,
edca = &priv->edca.params[i];
score = ((edca->aifns + edca->cwmin) << 16) +
((edca->cwmax - edca->cwmin) *
- (get_random_int() & 0xFFFF));
+ get_random_u16());
if (score < best && (winner < 0 || i != 3)) {
best = score;
winner = i;
diff --git a/drivers/scsi/lpfc/lpfc_hbadisc.c b/drivers/scsi/lpfc/lpfc_hbadisc.c
index c7f834ba8edb..d38ebd7281b9 100644
--- a/drivers/scsi/lpfc/lpfc_hbadisc.c
+++ b/drivers/scsi/lpfc/lpfc_hbadisc.c
@@ -2156,8 +2156,8 @@ lpfc_check_pending_fcoe_event(struct lpfc_hba *phba, uint8_t unreg_fcf)
* This function makes an running random selection decision on FCF record to
* use through a sequence of @fcf_cnt eligible FCF records with equal
* probability. To perform integer manunipulation of random numbers with
- * size unit32_t, the lower 16 bits of the 32-bit random number returned
- * from prandom_u32() are taken as the random random number generated.
+ * size unit32_t, a 16-bit random number returned from get_random_u16() is
+ * taken as the random random number generated.
*
* Returns true when outcome is for the newly read FCF record should be
* chosen; otherwise, return false when outcome is for keeping the previously
@@ -2169,7 +2169,7 @@ lpfc_sli4_new_fcf_random_select(struct lpfc_hba *phba, uint32_t fcf_cnt)
uint32_t rand_num;
/* Get 16-bit uniform random number */
- rand_num = 0xFFFF & prandom_u32();
+ rand_num = get_random_u16();
/* Decision with probability 1/fcf_cnt */
if ((fcf_cnt * rand_num) < 0xFFFF)
diff --git a/lib/cmdline_kunit.c b/lib/cmdline_kunit.c
index a72a2c16066e..d4572dbc9145 100644
--- a/lib/cmdline_kunit.c
+++ b/lib/cmdline_kunit.c
@@ -76,7 +76,7 @@ static void cmdline_test_lead_int(struct kunit *test)
int rc = cmdline_test_values[i];
int offset;
- sprintf(in, "%u%s", get_random_int() % 256, str);
+ sprintf(in, "%u%s", get_random_u8(), str);
/* Only first '-' after the number will advance the pointer */
offset = strlen(in) - strlen(str) + !!(rc == 2);
cmdline_do_one_test(test, in, rc, offset);
@@ -94,7 +94,7 @@ static void cmdline_test_tail_int(struct kunit *test)
int rc = strcmp(str, "") ? (strcmp(str, "-") ? 0 : 1) : 1;
int offset;
- sprintf(in, "%s%u", str, get_random_int() % 256);
+ sprintf(in, "%s%u", str, get_random_u8());
/*
* Only first and leading '-' not followed by integer
* will advance the pointer.
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index 6a6e121dc00c..713b7b8dad7e 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -144,7 +144,7 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
inet->inet_daddr,
inet->inet_sport,
inet->inet_dport);
- inet->inet_id = prandom_u32();
+ inet->inet_id = get_random_u16();
err = dccp_connect(sk);
rt = NULL;
@@ -443,7 +443,7 @@ struct sock *dccp_v4_request_recv_sock(const struct sock *sk,
RCU_INIT_POINTER(newinet->inet_opt, rcu_dereference(ireq->ireq_opt));
newinet->mc_index = inet_iif(skb);
newinet->mc_ttl = ip_hdr(skb)->ttl;
- newinet->inet_id = prandom_u32();
+ newinet->inet_id = get_random_u16();
if (dst == NULL && (dst = inet_csk_route_child_sock(sk, newsk, req)) == NULL)
goto put_and_exit;
diff --git a/net/ipv4/datagram.c b/net/ipv4/datagram.c
index 405a8c2aea64..0ee7fd259730 100644
--- a/net/ipv4/datagram.c
+++ b/net/ipv4/datagram.c
@@ -73,7 +73,7 @@ int __ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len
reuseport_has_conns(sk, true);
sk->sk_state = TCP_ESTABLISHED;
sk_set_txhash(sk);
- inet->inet_id = prandom_u32();
+ inet->inet_id = get_random_u16();
sk_dst_set(sk, &rt->dst);
err = 0;
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c
index 1ae83ad629b2..922c87ef1ab5 100644
--- a/net/ipv4/ip_output.c
+++ b/net/ipv4/ip_output.c
@@ -172,7 +172,7 @@ int ip_build_and_send_pkt(struct sk_buff *skb, const struct sock *sk,
* Avoid using the hashed IP ident generator.
*/
if (sk->sk_protocol == IPPROTO_TCP)
- iph->id = (__force __be16)prandom_u32();
+ iph->id = (__force __be16)get_random_u16();
else
__ip_select_ident(net, iph, 1);
}
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index 6376ad915765..7a250ef9d1b7 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -323,7 +323,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
inet->inet_daddr);
}
- inet->inet_id = prandom_u32();
+ inet->inet_id = get_random_u16();
if (tcp_fastopen_defer_connect(sk, &err))
return err;
@@ -1543,7 +1543,7 @@ struct sock *tcp_v4_syn_recv_sock(const struct sock *sk, struct sk_buff *skb,
inet_csk(newsk)->icsk_ext_hdr_len = 0;
if (inet_opt)
inet_csk(newsk)->icsk_ext_hdr_len = inet_opt->opt.optlen;
- newinet->inet_id = prandom_u32();
+ newinet->inet_id = get_random_u16();
/* Set ToS of the new socket based upon the value of incoming SYN.
* ECT bits are set later in tcp_init_transfer().
diff --git a/net/mac80211/scan.c b/net/mac80211/scan.c
index 0e8c4f48c36d..dc3cdee51e66 100644
--- a/net/mac80211/scan.c
+++ b/net/mac80211/scan.c
@@ -641,7 +641,7 @@ static void ieee80211_send_scan_probe_req(struct ieee80211_sub_if_data *sdata,
if (flags & IEEE80211_PROBE_FLAG_RANDOM_SN) {
struct ieee80211_hdr *hdr = (void *)skb->data;
struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
- u16 sn = get_random_u32();
+ u16 sn = get_random_u16();
info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
hdr->seq_ctrl =
diff --git a/net/netfilter/nf_nat_core.c b/net/netfilter/nf_nat_core.c
index d8e6380f6337..18319a6e6806 100644
--- a/net/netfilter/nf_nat_core.c
+++ b/net/netfilter/nf_nat_core.c
@@ -468,7 +468,7 @@ static void nf_nat_l4proto_unique_tuple(struct nf_conntrack_tuple *tuple,
if (range->flags & NF_NAT_RANGE_PROTO_OFFSET)
off = (ntohs(*keyptr) - ntohs(range->base_proto.all));
else
- off = prandom_u32();
+ off = get_random_u16();
attempts = range_size;
if (attempts > max_attempts)
@@ -490,7 +490,7 @@ static void nf_nat_l4proto_unique_tuple(struct nf_conntrack_tuple *tuple,
if (attempts >= range_size || attempts < 16)
return;
attempts /= 2;
- off = prandom_u32();
+ off = get_random_u16();
goto another_round;
}
diff --git a/net/sched/sch_cake.c b/net/sched/sch_cake.c
index 55c6879d2c7e..7193d25932ce 100644
--- a/net/sched/sch_cake.c
+++ b/net/sched/sch_cake.c
@@ -2092,11 +2092,11 @@ static struct sk_buff *cake_dequeue(struct Qdisc *sch)
WARN_ON(host_load > CAKE_QUEUES);
- /* The shifted prandom_u32() is a way to apply dithering to
- * avoid accumulating roundoff errors
+ /* The get_random_u16() is a way to apply dithering to avoid
+ * accumulating roundoff errors
*/
flow->deficit += (b->flow_quantum * quantum_div[host_load] +
- (prandom_u32() >> 16)) >> 16;
+ get_random_u16()) >> 16;
list_move_tail(&flow->flowchain, &b->old_flows);
goto retry;
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 1e354ba44960..83628c347744 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -9448,7 +9448,7 @@ void sctp_copy_sock(struct sock *newsk, struct sock *sk,
newinet->inet_rcv_saddr = inet->inet_rcv_saddr;
newinet->inet_dport = htons(asoc->peer.port);
newinet->pmtudisc = inet->pmtudisc;
- newinet->inet_id = prandom_u32();
+ newinet->inet_id = get_random_u16();
newinet->uc_ttl = inet->uc_ttl;
newinet->mc_loop = 1;
--
2.37.3
Rather than truncate a 32-bit value to a 16-bit value or an 8-bit value,
simply use the get_random_{u8,u16}() functions, which are faster than
wasting the additional bytes from a 32-bit value. This was done by hand,
identifying all of the places where one of the random integer functions
was used in a non-32-bit context.
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Yury Norov <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>
---
arch/s390/kernel/process.c | 2 +-
drivers/mtd/nand/raw/nandsim.c | 2 +-
lib/test_vmalloc.c | 2 +-
net/rds/bind.c | 2 +-
net/sched/sch_sfb.c | 2 +-
5 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c
index 5ec78555dd2e..42af4b3aa02b 100644
--- a/arch/s390/kernel/process.c
+++ b/arch/s390/kernel/process.c
@@ -230,7 +230,7 @@ unsigned long arch_align_stack(unsigned long sp)
static inline unsigned long brk_rnd(void)
{
- return (get_random_int() & BRK_RND_MASK) << PAGE_SHIFT;
+ return (get_random_u16() & BRK_RND_MASK) << PAGE_SHIFT;
}
unsigned long arch_randomize_brk(struct mm_struct *mm)
diff --git a/drivers/mtd/nand/raw/nandsim.c b/drivers/mtd/nand/raw/nandsim.c
index 50bcf745e816..d211939c8bdd 100644
--- a/drivers/mtd/nand/raw/nandsim.c
+++ b/drivers/mtd/nand/raw/nandsim.c
@@ -1402,7 +1402,7 @@ static int ns_do_read_error(struct nandsim *ns, int num)
static void ns_do_bit_flips(struct nandsim *ns, int num)
{
- if (bitflips && prandom_u32() < (1 << 22)) {
+ if (bitflips && get_random_u16() < (1 << 6)) {
int flips = 1;
if (bitflips > 1)
flips = prandom_u32_max(bitflips) + 1;
diff --git a/lib/test_vmalloc.c b/lib/test_vmalloc.c
index a26bbbf20e62..cf7780572f5b 100644
--- a/lib/test_vmalloc.c
+++ b/lib/test_vmalloc.c
@@ -80,7 +80,7 @@ static int random_size_align_alloc_test(void)
int i;
for (i = 0; i < test_loop_count; i++) {
- rnd = prandom_u32();
+ rnd = get_random_u8();
/*
* Maximum 1024 pages, if PAGE_SIZE is 4096.
diff --git a/net/rds/bind.c b/net/rds/bind.c
index 5b5fb4ca8d3e..97a29172a8ee 100644
--- a/net/rds/bind.c
+++ b/net/rds/bind.c
@@ -104,7 +104,7 @@ static int rds_add_bound(struct rds_sock *rs, const struct in6_addr *addr,
return -EINVAL;
last = rover;
} else {
- rover = max_t(u16, prandom_u32(), 2);
+ rover = max_t(u16, get_random_u16(), 2);
last = rover - 1;
}
diff --git a/net/sched/sch_sfb.c b/net/sched/sch_sfb.c
index e2389fa3cff8..0366a1a029a9 100644
--- a/net/sched/sch_sfb.c
+++ b/net/sched/sch_sfb.c
@@ -379,7 +379,7 @@ static int sfb_enqueue(struct sk_buff *skb, struct Qdisc *sch,
goto enqueue;
}
- r = prandom_u32() & SFB_MAX_PROB;
+ r = get_random_u16() & SFB_MAX_PROB;
if (unlikely(r < p_min)) {
if (unlikely(p_min > SFB_MAX_PROB / 2)) {
--
2.37.3
The prandom_bytes() function has been a deprecated inline wrapper around
get_random_bytes() for several releases now, and compiles down to the
exact same code. Replace the deprecated wrapper with a direct call to
the real function. This was done as a basic find and replace.
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Yury Norov <[email protected]>
Reviewed-by: Christophe Leroy <[email protected]> # powerpc
Signed-off-by: Jason A. Donenfeld <[email protected]>
---
arch/powerpc/crypto/crc-vpmsum_test.c | 2 +-
block/blk-crypto-fallback.c | 2 +-
crypto/async_tx/raid6test.c | 2 +-
drivers/dma/dmatest.c | 2 +-
drivers/mtd/nand/raw/nandsim.c | 2 +-
drivers/mtd/tests/mtd_nandecctest.c | 2 +-
drivers/mtd/tests/speedtest.c | 2 +-
drivers/mtd/tests/stresstest.c | 2 +-
drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 +-
drivers/net/ethernet/rocker/rocker_main.c | 2 +-
drivers/net/wireguard/selftest/allowedips.c | 12 ++++++------
fs/ubifs/debug.c | 2 +-
kernel/kcsan/selftest.c | 2 +-
lib/random32.c | 2 +-
lib/test_objagg.c | 2 +-
lib/uuid.c | 2 +-
net/ipv4/route.c | 2 +-
net/mac80211/rc80211_minstrel_ht.c | 2 +-
net/sched/sch_pie.c | 2 +-
19 files changed, 24 insertions(+), 24 deletions(-)
diff --git a/arch/powerpc/crypto/crc-vpmsum_test.c b/arch/powerpc/crypto/crc-vpmsum_test.c
index c1c1ef9457fb..273c527868db 100644
--- a/arch/powerpc/crypto/crc-vpmsum_test.c
+++ b/arch/powerpc/crypto/crc-vpmsum_test.c
@@ -82,7 +82,7 @@ static int __init crc_test_init(void)
if (len <= offset)
continue;
- prandom_bytes(data, len);
+ get_random_bytes(data, len);
len -= offset;
crypto_shash_update(crct10dif_shash, data+offset, len);
diff --git a/block/blk-crypto-fallback.c b/block/blk-crypto-fallback.c
index 621abd1b0e4d..ad9844c5b40c 100644
--- a/block/blk-crypto-fallback.c
+++ b/block/blk-crypto-fallback.c
@@ -539,7 +539,7 @@ static int blk_crypto_fallback_init(void)
if (blk_crypto_fallback_inited)
return 0;
- prandom_bytes(blank_key, BLK_CRYPTO_MAX_KEY_SIZE);
+ get_random_bytes(blank_key, BLK_CRYPTO_MAX_KEY_SIZE);
err = bioset_init(&crypto_bio_split, 64, 0, 0);
if (err)
diff --git a/crypto/async_tx/raid6test.c b/crypto/async_tx/raid6test.c
index c9d218e53bcb..f74505f2baf0 100644
--- a/crypto/async_tx/raid6test.c
+++ b/crypto/async_tx/raid6test.c
@@ -37,7 +37,7 @@ static void makedata(int disks)
int i;
for (i = 0; i < disks; i++) {
- prandom_bytes(page_address(data[i]), PAGE_SIZE);
+ get_random_bytes(page_address(data[i]), PAGE_SIZE);
dataptrs[i] = data[i];
dataoffs[i] = 0;
}
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 9fe2ae794316..ffe621695e47 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -312,7 +312,7 @@ static unsigned long dmatest_random(void)
{
unsigned long buf;
- prandom_bytes(&buf, sizeof(buf));
+ get_random_bytes(&buf, sizeof(buf));
return buf;
}
diff --git a/drivers/mtd/nand/raw/nandsim.c b/drivers/mtd/nand/raw/nandsim.c
index d211939c8bdd..672719023241 100644
--- a/drivers/mtd/nand/raw/nandsim.c
+++ b/drivers/mtd/nand/raw/nandsim.c
@@ -1393,7 +1393,7 @@ static int ns_do_read_error(struct nandsim *ns, int num)
unsigned int page_no = ns->regs.row;
if (ns_read_error(page_no)) {
- prandom_bytes(ns->buf.byte, num);
+ get_random_bytes(ns->buf.byte, num);
NS_WARN("simulating read error in page %u\n", page_no);
return 1;
}
diff --git a/drivers/mtd/tests/mtd_nandecctest.c b/drivers/mtd/tests/mtd_nandecctest.c
index 1c7201b0f372..440988562cfd 100644
--- a/drivers/mtd/tests/mtd_nandecctest.c
+++ b/drivers/mtd/tests/mtd_nandecctest.c
@@ -266,7 +266,7 @@ static int nand_ecc_test_run(const size_t size)
goto error;
}
- prandom_bytes(correct_data, size);
+ get_random_bytes(correct_data, size);
ecc_sw_hamming_calculate(correct_data, size, correct_ecc, sm_order);
for (i = 0; i < ARRAY_SIZE(nand_ecc_test); i++) {
nand_ecc_test[i].prepare(error_data, error_ecc,
diff --git a/drivers/mtd/tests/speedtest.c b/drivers/mtd/tests/speedtest.c
index c9ec7086bfa1..075bce32caa5 100644
--- a/drivers/mtd/tests/speedtest.c
+++ b/drivers/mtd/tests/speedtest.c
@@ -223,7 +223,7 @@ static int __init mtd_speedtest_init(void)
if (!iobuf)
goto out;
- prandom_bytes(iobuf, mtd->erasesize);
+ get_random_bytes(iobuf, mtd->erasesize);
bbt = kzalloc(ebcnt, GFP_KERNEL);
if (!bbt)
diff --git a/drivers/mtd/tests/stresstest.c b/drivers/mtd/tests/stresstest.c
index d2faaca7f19d..75b6ddc5dc4d 100644
--- a/drivers/mtd/tests/stresstest.c
+++ b/drivers/mtd/tests/stresstest.c
@@ -183,7 +183,7 @@ static int __init mtd_stresstest_init(void)
goto out;
for (i = 0; i < ebcnt; i++)
offsets[i] = mtd->erasesize;
- prandom_bytes(writebuf, bufsize);
+ get_random_bytes(writebuf, bufsize);
bbt = kzalloc(ebcnt, GFP_KERNEL);
if (!bbt)
diff --git a/drivers/net/ethernet/broadcom/bnxt/bnxt.c b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
index eed98c10ca9d..04cf7684f1b0 100644
--- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
+++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
@@ -3874,7 +3874,7 @@ static void bnxt_init_vnics(struct bnxt *bp)
if (bp->vnic_info[i].rss_hash_key) {
if (i == 0)
- prandom_bytes(vnic->rss_hash_key,
+ get_random_bytes(vnic->rss_hash_key,
HW_HASH_KEY_SIZE);
else
memcpy(vnic->rss_hash_key,
diff --git a/drivers/net/ethernet/rocker/rocker_main.c b/drivers/net/ethernet/rocker/rocker_main.c
index 5672d952452f..9e59669a93dd 100644
--- a/drivers/net/ethernet/rocker/rocker_main.c
+++ b/drivers/net/ethernet/rocker/rocker_main.c
@@ -224,7 +224,7 @@ static int rocker_dma_test_offset(const struct rocker *rocker,
if (err)
goto unmap;
- prandom_bytes(buf, ROCKER_TEST_DMA_BUF_SIZE);
+ get_random_bytes(buf, ROCKER_TEST_DMA_BUF_SIZE);
for (i = 0; i < ROCKER_TEST_DMA_BUF_SIZE; i++)
expect[i] = ~buf[i];
err = rocker_dma_test_one(rocker, wait, ROCKER_TEST_DMA_CTRL_INVERT,
diff --git a/drivers/net/wireguard/selftest/allowedips.c b/drivers/net/wireguard/selftest/allowedips.c
index dd897c0740a2..19eac00b2381 100644
--- a/drivers/net/wireguard/selftest/allowedips.c
+++ b/drivers/net/wireguard/selftest/allowedips.c
@@ -284,7 +284,7 @@ static __init bool randomized_test(void)
mutex_lock(&mutex);
for (i = 0; i < NUM_RAND_ROUTES; ++i) {
- prandom_bytes(ip, 4);
+ get_random_bytes(ip, 4);
cidr = prandom_u32_max(32) + 1;
peer = peers[prandom_u32_max(NUM_PEERS)];
if (wg_allowedips_insert_v4(&t, (struct in_addr *)ip, cidr,
@@ -299,7 +299,7 @@ static __init bool randomized_test(void)
}
for (j = 0; j < NUM_MUTATED_ROUTES; ++j) {
memcpy(mutated, ip, 4);
- prandom_bytes(mutate_mask, 4);
+ get_random_bytes(mutate_mask, 4);
mutate_amount = prandom_u32_max(32);
for (k = 0; k < mutate_amount / 8; ++k)
mutate_mask[k] = 0xff;
@@ -328,7 +328,7 @@ static __init bool randomized_test(void)
}
for (i = 0; i < NUM_RAND_ROUTES; ++i) {
- prandom_bytes(ip, 16);
+ get_random_bytes(ip, 16);
cidr = prandom_u32_max(128) + 1;
peer = peers[prandom_u32_max(NUM_PEERS)];
if (wg_allowedips_insert_v6(&t, (struct in6_addr *)ip, cidr,
@@ -343,7 +343,7 @@ static __init bool randomized_test(void)
}
for (j = 0; j < NUM_MUTATED_ROUTES; ++j) {
memcpy(mutated, ip, 16);
- prandom_bytes(mutate_mask, 16);
+ get_random_bytes(mutate_mask, 16);
mutate_amount = prandom_u32_max(128);
for (k = 0; k < mutate_amount / 8; ++k)
mutate_mask[k] = 0xff;
@@ -381,13 +381,13 @@ static __init bool randomized_test(void)
for (j = 0;; ++j) {
for (i = 0; i < NUM_QUERIES; ++i) {
- prandom_bytes(ip, 4);
+ get_random_bytes(ip, 4);
if (lookup(t.root4, 32, ip) != horrible_allowedips_lookup_v4(&h, (struct in_addr *)ip)) {
horrible_allowedips_lookup_v4(&h, (struct in_addr *)ip);
pr_err("allowedips random v4 self-test: FAIL\n");
goto free;
}
- prandom_bytes(ip, 16);
+ get_random_bytes(ip, 16);
if (lookup(t.root6, 128, ip) != horrible_allowedips_lookup_v6(&h, (struct in6_addr *)ip)) {
pr_err("allowedips random v6 self-test: FAIL\n");
goto free;
diff --git a/fs/ubifs/debug.c b/fs/ubifs/debug.c
index f4d3b568aa64..3f128b9fdfbb 100644
--- a/fs/ubifs/debug.c
+++ b/fs/ubifs/debug.c
@@ -2581,7 +2581,7 @@ static int corrupt_data(const struct ubifs_info *c, const void *buf,
if (ffs)
memset(p + from, 0xFF, to - from);
else
- prandom_bytes(p + from, to - from);
+ get_random_bytes(p + from, to - from);
return to;
}
diff --git a/kernel/kcsan/selftest.c b/kernel/kcsan/selftest.c
index 58b94deae5c0..00cdf8fa5693 100644
--- a/kernel/kcsan/selftest.c
+++ b/kernel/kcsan/selftest.c
@@ -46,7 +46,7 @@ static bool __init test_encode_decode(void)
unsigned long addr;
size_t verif_size;
- prandom_bytes(&addr, sizeof(addr));
+ get_random_bytes(&addr, sizeof(addr));
if (addr < PAGE_SIZE)
addr = PAGE_SIZE;
diff --git a/lib/random32.c b/lib/random32.c
index d4f19e1a69d4..32060b852668 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -69,7 +69,7 @@ EXPORT_SYMBOL(prandom_u32_state);
* @bytes: the requested number of bytes
*
* This is used for pseudo-randomness with no outside seeding.
- * For more random results, use prandom_bytes().
+ * For more random results, use get_random_bytes().
*/
void prandom_bytes_state(struct rnd_state *state, void *buf, size_t bytes)
{
diff --git a/lib/test_objagg.c b/lib/test_objagg.c
index da137939a410..c0c957c50635 100644
--- a/lib/test_objagg.c
+++ b/lib/test_objagg.c
@@ -157,7 +157,7 @@ static int test_nodelta_obj_get(struct world *world, struct objagg *objagg,
int err;
if (should_create_root)
- prandom_bytes(world->next_root_buf,
+ get_random_bytes(world->next_root_buf,
sizeof(world->next_root_buf));
objagg_obj = world_obj_get(world, objagg, key_id);
diff --git a/lib/uuid.c b/lib/uuid.c
index 562d53977cab..e309b4c5be3d 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -52,7 +52,7 @@ EXPORT_SYMBOL(generate_random_guid);
static void __uuid_gen_common(__u8 b[16])
{
- prandom_bytes(b, 16);
+ get_random_bytes(b, 16);
/* reversion 0b10 */
b[8] = (b[8] & 0x3F) | 0x80;
}
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 1a37a07c7163..cd1fa9f70f1a 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -3719,7 +3719,7 @@ int __init ip_rt_init(void)
ip_idents = idents_hash;
- prandom_bytes(ip_idents, (ip_idents_mask + 1) * sizeof(*ip_idents));
+ get_random_bytes(ip_idents, (ip_idents_mask + 1) * sizeof(*ip_idents));
ip_tstamps = idents_hash + (ip_idents_mask + 1) * sizeof(*ip_idents);
diff --git a/net/mac80211/rc80211_minstrel_ht.c b/net/mac80211/rc80211_minstrel_ht.c
index 7f3f5f51081d..3d91b98db099 100644
--- a/net/mac80211/rc80211_minstrel_ht.c
+++ b/net/mac80211/rc80211_minstrel_ht.c
@@ -2036,7 +2036,7 @@ static void __init init_sample_table(void)
memset(sample_table, 0xff, sizeof(sample_table));
for (col = 0; col < SAMPLE_COLUMNS; col++) {
- prandom_bytes(rnd, sizeof(rnd));
+ get_random_bytes(rnd, sizeof(rnd));
for (i = 0; i < MCS_GROUP_RATES; i++) {
new_idx = (i + rnd[i]) % MCS_GROUP_RATES;
while (sample_table[col][new_idx] != 0xff)
diff --git a/net/sched/sch_pie.c b/net/sched/sch_pie.c
index 974038ba6c7b..265c238047a4 100644
--- a/net/sched/sch_pie.c
+++ b/net/sched/sch_pie.c
@@ -72,7 +72,7 @@ bool pie_drop_early(struct Qdisc *sch, struct pie_params *params,
if (vars->accu_prob >= (MAX_PROB / 2) * 17)
return true;
- prandom_bytes(&rnd, 8);
+ get_random_bytes(&rnd, 8);
if ((rnd >> BITS_PER_BYTE) < local_prob) {
vars->accu_prob = 0;
return true;
--
2.37.3
With no callers left of prandom_u32() and prandom_bytes(), as well as
get_random_int(), remove these deprecated wrappers, in favor of
get_random_u32() and get_random_bytes().
Reviewed-by: Greg Kroah-Hartman <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Yury Norov <[email protected]>
Signed-off-by: Jason A. Donenfeld <[email protected]>
---
drivers/char/random.c | 11 +++++------
include/linux/prandom.h | 12 ------------
include/linux/random.h | 5 -----
3 files changed, 5 insertions(+), 23 deletions(-)
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 01acf235f263..2fe28eeb2f38 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -97,7 +97,7 @@ MODULE_PARM_DESC(ratelimit_disable, "Disable random ratelimit suppression");
* Returns whether or not the input pool has been seeded and thus guaranteed
* to supply cryptographically secure random numbers. This applies to: the
* /dev/urandom device, the get_random_bytes function, and the get_random_{u8,
- * u16,u32,u64,int,long} family of functions.
+ * u16,u32,u64,long} family of functions.
*
* Returns: true if the input pool has been seeded.
* false if the input pool has not been seeded.
@@ -161,15 +161,14 @@ EXPORT_SYMBOL(wait_for_random_bytes);
* u16 get_random_u16()
* u32 get_random_u32()
* u64 get_random_u64()
- * unsigned int get_random_int()
* unsigned long get_random_long()
*
* These interfaces will return the requested number of random bytes
* into the given buffer or as a return value. This is equivalent to
- * a read from /dev/urandom. The u8, u16, u32, u64, int, and long
- * family of functions may be higher performance for one-off random
- * integers, because they do a bit of buffering and do not invoke
- * reseeding until the buffer is emptied.
+ * a read from /dev/urandom. The u8, u16, u32, u64, long family of
+ * functions may be higher performance for one-off random integers,
+ * because they do a bit of buffering and do not invoke reseeding
+ * until the buffer is emptied.
*
*********************************************************************/
diff --git a/include/linux/prandom.h b/include/linux/prandom.h
index 78db003bc290..e0a0759dd09c 100644
--- a/include/linux/prandom.h
+++ b/include/linux/prandom.h
@@ -12,18 +12,6 @@
#include <linux/percpu.h>
#include <linux/random.h>
-/* Deprecated: use get_random_u32 instead. */
-static inline u32 prandom_u32(void)
-{
- return get_random_u32();
-}
-
-/* Deprecated: use get_random_bytes instead. */
-static inline void prandom_bytes(void *buf, size_t nbytes)
-{
- return get_random_bytes(buf, nbytes);
-}
-
struct rnd_state {
__u32 s1, s2, s3, s4;
};
diff --git a/include/linux/random.h b/include/linux/random.h
index 08322f700cdc..147a5e0d0b8e 100644
--- a/include/linux/random.h
+++ b/include/linux/random.h
@@ -42,10 +42,6 @@ u8 get_random_u8(void);
u16 get_random_u16(void);
u32 get_random_u32(void);
u64 get_random_u64(void);
-static inline unsigned int get_random_int(void)
-{
- return get_random_u32();
-}
static inline unsigned long get_random_long(void)
{
#if BITS_PER_LONG == 64
@@ -100,7 +96,6 @@ declare_get_random_var_wait(u8, u8)
declare_get_random_var_wait(u16, u16)
declare_get_random_var_wait(u32, u32)
declare_get_random_var_wait(u64, u32)
-declare_get_random_var_wait(int, unsigned int)
declare_get_random_var_wait(long, unsigned long)
#undef declare_get_random_var
--
2.37.3
> diff --git a/crypto/testmgr.c b/crypto/testmgr.c
...
> @@ -944,7 +944,7 @@ static void generate_random_bytes(u8 *buf, size_t count)
> default:
> /* Fully random bytes */
> for (i = 0; i < count; i++)
> - buf[i] = (u8)prandom_u32();
> + buf[i] = get_random_u8();
Should that whole for loop be replaced with this?
get_random_bytes(buf, count);
On Tue, Oct 11, 2022 at 01:18:40AM +0000, Elliott, Robert (Servers) wrote:
>
> > diff --git a/crypto/testmgr.c b/crypto/testmgr.c
> ...
> > @@ -944,7 +944,7 @@ static void generate_random_bytes(u8 *buf, size_t count)
> > default:
> > /* Fully random bytes */
> > for (i = 0; i < count; i++)
> > - buf[i] = (u8)prandom_u32();
> > + buf[i] = get_random_u8();
>
> Should that whole for loop be replaced with this?
> get_random_bytes(buf, count);
Wow, that's kind of grotesque. Yea, it certainly should. But that's
beyond the scope of this patchset. I'll send a follow-up patch just for
this case to Herbert after this cleanup lands, though.
Jason
On Mon, Oct 10, 2022 at 05:06:07PM -0600, Jason A. Donenfeld wrote:
> Rather than incurring a division or requesting too many random bytes for
> the given range, use the prandom_u32_max() function, which only takes
> the minimum required bytes from the RNG and avoids divisions. This was
...
> Reviewed-by: Greg Kroah-Hartman <[email protected]>
> Reviewed-by: Kees Cook <[email protected]>
> Reviewed-by: Yury Norov <[email protected]>
> Reviewed-by: KP Singh <[email protected]>
> Reviewed-by: Jan Kara <[email protected]> # for ext4 and sbitmap
> Reviewed-by: Christoph B?hmwalder <[email protected]> # for drbd
> Acked-by: Ulf Hansson <[email protected]> # for mmc
> Acked-by: Darrick J. Wong <[email protected]> # for xfs
> Signed-off-by: Jason A. Donenfeld <[email protected]>
> ---
> arch/s390/kernel/process.c | 2 +-
> arch/s390/kernel/vdso.c | 2 +-
For s390:
Acked-by: Heiko Carstens <[email protected]>
On Mon, 10 Oct 2022 17:06:06 -0600 Jason A. Donenfeld wrote:
> - If you want a secure or an insecure random u64, use get_random_u64().
> - If you want a secure or an insecure random u32, use get_random_u32().
> * The old function prandom_u32() has been deprecated for a while now
> and is just a wrapper around get_random_u32(). Same for
> get_random_int().
> - If you want a secure or an insecure random u16, use get_random_u16().
> - If you want a secure or an insecure random u8, use get_random_u8().
> - If you want secure or insecure random bytes, use get_random_bytes().
> * The old function prandom_bytes() has been deprecated for a while now
> and has long been a wrapper around get_random_bytes().
> - If you want a non-uniform random u32, u16, or u8 bounded by a certain
> open interval maximum, use prandom_u32_max().
> * I say "non-uniform", because it doesn't do any rejection sampling or
> divisions. Hence, it stays within the prandom_* namespace.
Acked-by: Jakub Kicinski <[email protected]>