Hello,
syzbot found the following issue on:
HEAD commit: 3e12361b6d23 bcm63xx_enet: delete a redundant assignment
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=160cec72300000
kernel config: https://syzkaller.appspot.com/x/.config?x=63a23a80f42a8989
dashboard link: https://syzkaller.appspot.com/bug?extid=b187b77c8474f9648fae
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144d07b6300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=171b7fca300000
The issue was bisected to:
commit 4611ce22468895acd61fee9ac1da810d60617d9a
Author: Daniel Jordan <[email protected]>
Date: Wed Jun 3 22:59:39 2020 +0000
padata: allocate work structures for parallel jobs from a pool
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=118dccae300000
console output: https://syzkaller.appspot.com/x/log.txt?x=158dccae300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: [email protected]
Fixes: 4611ce224688 ("padata: allocate work structures for parallel jobs from a pool")
==================================================================
BUG: KASAN: use-after-free in __crypto_xor+0x376/0x410 crypto/algapi.c:1001
Read of size 8 at addr ffff88803691a000 by task kworker/u4:1/10
CPU: 1 PID: 10 Comm: kworker/u4:1 Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: pencrypt_parallel padata_parallel_worker
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105
print_address_description.constprop.0.cold+0x6c/0x309 mm/kasan/report.c:233
__kasan_report mm/kasan/report.c:419 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:436
__crypto_xor+0x376/0x410 crypto/algapi.c:1001
crypto_xor include/crypto/algapi.h:160 [inline]
crypto_ctr_crypt_segment crypto/ctr.c:60 [inline]
crypto_ctr_crypt+0x256/0x550 crypto/ctr.c:114
crypto_skcipher_encrypt+0xaa/0xf0 crypto/skcipher.c:630
crypto_gcm_encrypt+0x38f/0x4b0 crypto/gcm.c:461
crypto_aead_encrypt+0xaa/0xf0 crypto/aead.c:94
pcrypt_aead_enc+0x13/0x70 crypto/pcrypt.c:82
padata_parallel_worker+0x60/0xb0 kernel/padata.c:157
process_one_work+0x98d/0x1630 kernel/workqueue.c:2276
worker_thread+0x658/0x11f0 kernel/workqueue.c:2422
kthread+0x3e5/0x4d0 kernel/kthread.c:319
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the page:
page:ffffea0000da4680 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x3691a
flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000000000 ffffea0000dafd48 ffffea0000dad888 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as freed
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x400dc0(GFP_KERNEL_ACCOUNT|__GFP_ZERO), pid 8358, ts 60335781621, free_ts 60341472040
prep_new_page mm/page_alloc.c:2433 [inline]
get_page_from_freelist+0xa72/0x2f80 mm/page_alloc.c:4166
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5388
alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2244
__pte_alloc_one include/asm-generic/pgalloc.h:63 [inline]
pte_alloc_one+0x16/0x230 arch/x86/mm/pgtable.c:33
do_fault_around mm/memory.c:4136 [inline]
do_read_fault mm/memory.c:4157 [inline]
do_fault mm/memory.c:4291 [inline]
handle_pte_fault mm/memory.c:4549 [inline]
__handle_mm_fault+0x49de/0x5320 mm/memory.c:4684
handle_mm_fault+0x1c8/0x790 mm/memory.c:4782
do_user_addr_fault+0x48b/0x11c0 arch/x86/mm/fault.c:1390
handle_page_fault arch/x86/mm/fault.c:1475 [inline]
exc_page_fault+0x9e/0x180 arch/x86/mm/fault.c:1531
asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:568
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1343 [inline]
free_pcp_prepare+0x2c5/0x780 mm/page_alloc.c:1394
free_unref_page_prepare mm/page_alloc.c:3329 [inline]
free_unref_page_list+0x1a1/0x1050 mm/page_alloc.c:3445
release_pages+0x824/0x20b0 mm/swap.c:972
tlb_batch_pages_flush mm/mmu_gather.c:49 [inline]
tlb_flush_mmu_free mm/mmu_gather.c:242 [inline]
tlb_flush_mmu mm/mmu_gather.c:249 [inline]
tlb_finish_mmu+0x165/0x8c0 mm/mmu_gather.c:340
exit_mmap+0x1ea/0x620 mm/mmap.c:3203
__mmput+0x122/0x470 kernel/fork.c:1101
mmput+0x58/0x60 kernel/fork.c:1122
exit_mm kernel/exit.c:501 [inline]
do_exit+0xae2/0x2a60 kernel/exit.c:812
do_group_exit+0x125/0x310 kernel/exit.c:922
__do_sys_exit_group kernel/exit.c:933 [inline]
__se_sys_exit_group kernel/exit.c:931 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Memory state around the buggy address:
ffff888036919f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff888036919f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88803691a000: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
^
ffff88803691a080: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff88803691a100: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
==================================================================
---
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For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
On Thu, Sep 02, 2021 at 04:36:25PM -0700, syzbot wrote:
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit: 3e12361b6d23 bcm63xx_enet: delete a redundant assignment
> git tree: net-next
> console output: https://syzkaller.appspot.com/x/log.txt?x=160cec72300000
> kernel config: https://syzkaller.appspot.com/x/.config?x=63a23a80f42a8989
> dashboard link: https://syzkaller.appspot.com/bug?extid=b187b77c8474f9648fae
> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1
> syz repro: https://syzkaller.appspot.com/x/repro.syz?x=144d07b6300000
> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=171b7fca300000
>
> The issue was bisected to:
>
> commit 4611ce22468895acd61fee9ac1da810d60617d9a
> Author: Daniel Jordan <[email protected]>
> Date: Wed Jun 3 22:59:39 2020 +0000
>
> padata: allocate work structures for parallel jobs from a pool
>
> bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=118dccae300000
> console output: https://syzkaller.appspot.com/x/log.txt?x=158dccae300000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: [email protected]
> Fixes: 4611ce224688 ("padata: allocate work structures for parallel jobs from a pool")
>
> ==================================================================
> BUG: KASAN: use-after-free in __crypto_xor+0x376/0x410 crypto/algapi.c:1001
> Read of size 8 at addr ffff88803691a000 by task kworker/u4:1/10
The reproducer hasn't tripped over this yet, but I'll keep trying.