This is the start of the stable review cycle for the 4.8.15 release.
There are 33 patches in this series, all will be posted as a response
to this one. If anyone has any issues with these being applied, please
let me know.
Responses should be made by Thu Dec 15 17:15:24 UTC 2016.
Anything received after that time might be too late.
The whole patch series can be found in one patch at:
kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.8.15-rc1.gz
or in the git tree and branch at:
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.8.y
and the diffstat can be found below.
thanks,
greg k-h
-------------
Pseudo-Shortlog of commits:
Greg Kroah-Hartman <[email protected]>
Linux 4.8.15-rc1
David Michael <[email protected]>
crypto: rsa - Add Makefile dependencies to fix parallel builds
Michal Hocko <[email protected]>
hotplug: Make register and unregister notifier API symmetric
Sven Eckelmann <[email protected]>
batman-adv: Check for alloc errors when preparing TT local data
Boris Brezillon <[email protected]>
m68k: Fix ndelay() macro
Jeff Layton <[email protected]>
ceph: don't set req->r_locked_dir in ceph_d_revalidate
Stefan Agner <[email protected]>
ARM: dts: imx7d: fix LCDIF clock assignment
Roger Shimizu <[email protected]>
ARM: dts: orion5x: fix number of sata port for linkstation ls-gl
Rafael J. Wysocki <[email protected]>
Revert "ACPI: Execute _PTS before system reboot"
추지호 <[email protected]>
can: peak: fix bad memory access and free sequence
Marc Kleine-Budde <[email protected]>
can: raw: raw_setsockopt: limit number of can_filter that can be set
Romain Perier <[email protected]>
crypto: marvell - Don't corrupt state of an STD req for re-stepped ahash
tim <[email protected]>
crypto: mcryptd - Check mcryptd algorithm compatibility
Horia Geantă <[email protected]>
crypto: caam - fix pointer size for AArch64 boot loader, AArch32 kernel
Romain Perier <[email protected]>
crypto: marvell - Don't copy hash operation twice into the SRAM
Dan Williams <[email protected]>
acpi, nfit: fix bus vs dimm confusion in xlat_status
Dan Williams <[email protected]>
acpi, nfit: validate ars_status output buffer size
Dan Williams <[email protected]>
acpi, nfit, libnvdimm: fix / harden ars_status output length handling
Vishal Verma <[email protected]>
acpi, nfit: fix extended status translations for ACPI DSMs
Peter Zijlstra (Intel) <[email protected]>
perf/x86: Fix full width counter, counter overflow
Peng Tao <[email protected]>
vhost-vsock: fix orphan connection reset
Mike Galbraith <[email protected]>
sched/autogroup: Fix 64-bit kernel nice level adjustment
Mauricio Faria de Oliveira <[email protected]>
scsi: lpfc: fix oops/BUG in lpfc_sli_ringtxcmpl_put()
Dan Williams <[email protected]>
device-dax: fix private mapping restriction, permit read-only
Thomas Gleixner <[email protected]>
locking/rtmutex: Use READ_ONCE() in rt_mutex_owner()
Thomas Gleixner <[email protected]>
locking/rtmutex: Prevent dequeue vs. unlock race
Sergey Senozhatsky <[email protected]>
zram: restrict add/remove attributes to root only
Helge Deller <[email protected]>
parisc: Fix TLB related boot crash on SMP machines
John David Anglin <[email protected]>
parisc: Remove unnecessary TLB purges from flush_dcache_page_asm and flush_icache_page_asm
John David Anglin <[email protected]>
parisc: Purge TLB before setting PTE
Miklos Szeredi <[email protected]>
fuse: fix clearing suid, sgid for chown()
Ben Hutchings <[email protected]>
powerpc/boot: Fix build failure in 32-bit boot wrapper
Benjamin Herrenschmidt <[email protected]>
powerpc/mm: Fix lazy icache flush on pre-POWER5
Andrew Donnellan <[email protected]>
powerpc/eeh: Fix deadlock when PE frozen state can't be cleared
-------------
Diffstat:
Makefile | 4 +-
arch/arm/boot/dts/imx7s.dtsi | 5 +-
arch/arm/boot/dts/orion5x-linkstation-lsgl.dts | 4 ++
arch/m68k/include/asm/delay.h | 2 +-
arch/parisc/include/asm/pgtable.h | 8 +--
arch/parisc/kernel/cache.c | 11 +++++
arch/parisc/kernel/pacache.S | 22 +--------
arch/powerpc/boot/Makefile | 3 +-
arch/powerpc/boot/opal.c | 2 +-
arch/powerpc/kernel/eeh_driver.c | 4 +-
arch/powerpc/mm/hash64_4k.c | 2 +-
arch/powerpc/mm/hash64_64k.c | 4 +-
arch/x86/events/core.c | 2 +-
arch/x86/events/intel/core.c | 2 +-
crypto/Makefile | 1 +
crypto/mcryptd.c | 19 ++++---
drivers/acpi/nfit/core.c | 49 ++++++++++++++-----
drivers/acpi/sleep.c | 29 +++--------
drivers/block/zram/zram_drv.c | 8 ++-
drivers/crypto/caam/ctrl.c | 5 +-
drivers/crypto/marvell/hash.c | 11 ++---
drivers/dax/dax.c | 2 +-
drivers/net/can/usb/peak_usb/pcan_usb_core.c | 6 ++-
drivers/nvdimm/bus.c | 25 ++++++++--
drivers/scsi/lpfc/lpfc_sli.c | 14 +++---
drivers/vhost/vsock.c | 2 +-
fs/ceph/dir.c | 24 +++++----
fs/fuse/dir.c | 7 +--
include/linux/cpu.h | 15 ++----
include/linux/libnvdimm.h | 2 +-
include/uapi/linux/can.h | 1 +
kernel/cpu.c | 2 +-
kernel/locking/rtmutex.c | 68 +++++++++++++++++++++++++-
kernel/locking/rtmutex_common.h | 5 +-
kernel/sched/auto_group.c | 4 +-
net/batman-adv/translation-table.c | 4 +-
net/can/raw.c | 3 ++
37 files changed, 241 insertions(+), 140 deletions(-)
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Williams <[email protected]>
commit d6eb270c57fef35798525004ddf2ac5dcdadd43b upstream.
Given dimms and bus commands share the same command number space we need
to be careful that we are translating status in the correct context.
Otherwise we can, for example, fail an ND_CMD_GET_CONFIG_SIZE command
because max_xfer is zero. It fails because that condition erroneously
correlates with the 'cleared == 0' failure of ND_CMD_CLEAR_ERROR.
Fixes: aef253382266 ("libnvdimm, nfit: centralize command status translation")
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/nfit/core.c | 17 ++++++++++++++---
1 file changed, 14 insertions(+), 3 deletions(-)
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -94,7 +94,7 @@ static struct acpi_device *to_acpi_dev(s
return to_acpi_device(acpi_desc->dev);
}
-static int xlat_status(void *buf, unsigned int cmd, u32 status)
+static int xlat_bus_status(void *buf, unsigned int cmd, u32 status)
{
struct nd_cmd_clear_error *clear_err;
struct nd_cmd_ars_status *ars_status;
@@ -175,6 +175,16 @@ static int xlat_status(void *buf, unsign
return 0;
}
+static int xlat_status(struct nvdimm *nvdimm, void *buf, unsigned int cmd,
+ u32 status)
+{
+ if (!nvdimm)
+ return xlat_bus_status(buf, cmd, status);
+ if (status)
+ return -EIO;
+ return 0;
+}
+
static int acpi_nfit_ctl(struct nvdimm_bus_descriptor *nd_desc,
struct nvdimm *nvdimm, unsigned int cmd, void *buf,
unsigned int buf_len, int *cmd_rc)
@@ -335,7 +345,8 @@ static int acpi_nfit_ctl(struct nvdimm_b
*/
rc = buf_len - offset - in_buf.buffer.length;
if (cmd_rc)
- *cmd_rc = xlat_status(buf, cmd, fw_status);
+ *cmd_rc = xlat_status(nvdimm, buf, cmd,
+ fw_status);
} else {
dev_err(dev, "%s:%s underrun cmd: %s buf_len: %d out_len: %d\n",
__func__, dimm_name, cmd_name, buf_len,
@@ -345,7 +356,7 @@ static int acpi_nfit_ctl(struct nvdimm_b
} else {
rc = 0;
if (cmd_rc)
- *cmd_rc = xlat_status(buf, cmd, fw_status);
+ *cmd_rc = xlat_status(nvdimm, buf, cmd, fw_status);
}
out:
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Roger Shimizu <[email protected]>
commit 038ccb3e8cee52e07dc118ff99f47eaebc1d0746 upstream.
Bug report from Debian [0] shows there's minor changed model of
Linkstation LS-GL that uses the 2nd SATA port of the SoC.
So it's necessary to enable two SATA ports, though for that specific
model only the 2nd one is used.
[0] https://bugs.debian.org/845611
Fixes: b1742ffa9ddb ("ARM: dts: orion5x: add device tree for buffalo linkstation ls-gl")
Reported-by: Ryan Tandy <[email protected]>
Tested-by: Ryan Tandy <[email protected]>
Signed-off-by: Roger Shimizu <[email protected]>
Signed-off-by: Gregory CLEMENT <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/arm/boot/dts/orion5x-linkstation-lsgl.dts | 4 ++++
1 file changed, 4 insertions(+)
--- a/arch/arm/boot/dts/orion5x-linkstation-lsgl.dts
+++ b/arch/arm/boot/dts/orion5x-linkstation-lsgl.dts
@@ -82,6 +82,10 @@
gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
};
+&sata {
+ nr-ports = <2>;
+};
+
&ehci1 {
status = "okay";
};
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Benjamin Herrenschmidt <[email protected]>
commit dd7b2f035ec41a409f7a7cec7aabc0ec0eacf476 upstream.
On 64-bit CPUs with no-execute support and non-snooping icache, such as
970 or POWER4, we have a software mechanism to ensure coherency of the
cache (using exec faults when needed).
This was broken due to a logic error when the code was rewritten
from assembly to C, previously the assembly code did:
BEGIN_FTR_SECTION
mr r4,r30
mr r5,r7
bl hash_page_do_lazy_icache
END_FTR_SECTION(CPU_FTR_NOEXECUTE|CPU_FTR_COHERENT_ICACHE, CPU_FTR_NOEXECUTE)
Which tests that:
(cpu_features & (NOEXECUTE | COHERENT_ICACHE)) == NOEXECUTE
Which says that the current cpu does have NOEXECUTE, but does not have
COHERENT_ICACHE.
Fixes: 91f1da99792a ("powerpc/mm: Convert 4k hash insert to C")
Fixes: 89ff725051d1 ("powerpc/mm: Convert __hash_page_64K to C")
Fixes: a43c0eb8364c ("powerpc/mm: Convert 4k insert from asm to C")
Signed-off-by: Benjamin Herrenschmidt <[email protected]>
Reviewed-by: Aneesh Kumar K.V <[email protected]>
[mpe: Change log verbosification]
Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/powerpc/mm/hash64_4k.c | 2 +-
arch/powerpc/mm/hash64_64k.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
--- a/arch/powerpc/mm/hash64_4k.c
+++ b/arch/powerpc/mm/hash64_4k.c
@@ -55,7 +55,7 @@ int __hash_page_4K(unsigned long ea, uns
*/
rflags = htab_convert_pte_flags(new_pte);
- if (!cpu_has_feature(CPU_FTR_NOEXECUTE) &&
+ if (cpu_has_feature(CPU_FTR_NOEXECUTE) &&
!cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap);
--- a/arch/powerpc/mm/hash64_64k.c
+++ b/arch/powerpc/mm/hash64_64k.c
@@ -87,7 +87,7 @@ int __hash_page_4K(unsigned long ea, uns
subpg_pte = new_pte & ~subpg_prot;
rflags = htab_convert_pte_flags(subpg_pte);
- if (!cpu_has_feature(CPU_FTR_NOEXECUTE) &&
+ if (cpu_has_feature(CPU_FTR_NOEXECUTE) &&
!cpu_has_feature(CPU_FTR_COHERENT_ICACHE)) {
/*
@@ -258,7 +258,7 @@ int __hash_page_64K(unsigned long ea, un
rflags = htab_convert_pte_flags(new_pte);
- if (!cpu_has_feature(CPU_FTR_NOEXECUTE) &&
+ if (cpu_has_feature(CPU_FTR_NOEXECUTE) &&
!cpu_has_feature(CPU_FTR_COHERENT_ICACHE))
rflags = hash_page_do_lazy_icache(rflags, __pte(old_pte), trap);
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Michal Hocko <[email protected]>
commit 777c6e0daebb3fcefbbd6f620410a946b07ef6d0 upstream.
Yu Zhao has noticed that __unregister_cpu_notifier only unregisters its
notifiers when HOTPLUG_CPU=y while the registration might succeed even
when HOTPLUG_CPU=n if MODULE is enabled. This means that e.g. zswap
might keep a stale notifier on the list on the manual clean up during
the pool tear down and thus corrupt the list. Resulting in the following
[ 144.964346] BUG: unable to handle kernel paging request at ffff880658a2be78
[ 144.971337] IP: [<ffffffffa290b00b>] raw_notifier_chain_register+0x1b/0x40
<snipped>
[ 145.122628] Call Trace:
[ 145.125086] [<ffffffffa28e5cf8>] __register_cpu_notifier+0x18/0x20
[ 145.131350] [<ffffffffa2a5dd73>] zswap_pool_create+0x273/0x400
[ 145.137268] [<ffffffffa2a5e0fc>] __zswap_param_set+0x1fc/0x300
[ 145.143188] [<ffffffffa2944c1d>] ? trace_hardirqs_on+0xd/0x10
[ 145.149018] [<ffffffffa2908798>] ? kernel_param_lock+0x28/0x30
[ 145.154940] [<ffffffffa2a3e8cf>] ? __might_fault+0x4f/0xa0
[ 145.160511] [<ffffffffa2a5e237>] zswap_compressor_param_set+0x17/0x20
[ 145.167035] [<ffffffffa2908d3c>] param_attr_store+0x5c/0xb0
[ 145.172694] [<ffffffffa290848d>] module_attr_store+0x1d/0x30
[ 145.178443] [<ffffffffa2b2b41f>] sysfs_kf_write+0x4f/0x70
[ 145.183925] [<ffffffffa2b2a5b9>] kernfs_fop_write+0x149/0x180
[ 145.189761] [<ffffffffa2a99248>] __vfs_write+0x18/0x40
[ 145.194982] [<ffffffffa2a9a412>] vfs_write+0xb2/0x1a0
[ 145.200122] [<ffffffffa2a9a732>] SyS_write+0x52/0xa0
[ 145.205177] [<ffffffffa2ff4d97>] entry_SYSCALL_64_fastpath+0x12/0x17
This can be even triggered manually by changing
/sys/module/zswap/parameters/compressor multiple times.
Fix this issue by making unregister APIs symmetric to the register so
there are no surprises.
Fixes: 47e627bc8c9a ("[PATCH] hotplug: Allow modules to use the cpu hotplug notifiers even if !CONFIG_HOTPLUG_CPU")
Reported-and-tested-by: Yu Zhao <[email protected]>
Signed-off-by: Michal Hocko <[email protected]>
Cc: [email protected]
Cc: Andrew Morton <[email protected]>
Cc: Dan Streetman <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
include/linux/cpu.h | 15 ++++-----------
kernel/cpu.c | 2 +-
2 files changed, 5 insertions(+), 12 deletions(-)
--- a/include/linux/cpu.h
+++ b/include/linux/cpu.h
@@ -105,22 +105,16 @@ extern bool cpuhp_tasks_frozen;
{ .notifier_call = fn, .priority = pri }; \
__register_cpu_notifier(&fn##_nb); \
}
-#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
-#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
-#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
-#endif /* #else #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
-#ifdef CONFIG_HOTPLUG_CPU
extern int register_cpu_notifier(struct notifier_block *nb);
extern int __register_cpu_notifier(struct notifier_block *nb);
extern void unregister_cpu_notifier(struct notifier_block *nb);
extern void __unregister_cpu_notifier(struct notifier_block *nb);
-#else
-#ifndef MODULE
-extern int register_cpu_notifier(struct notifier_block *nb);
-extern int __register_cpu_notifier(struct notifier_block *nb);
-#else
+#else /* #if defined(CONFIG_HOTPLUG_CPU) || !defined(MODULE) */
+#define cpu_notifier(fn, pri) do { (void)(fn); } while (0)
+#define __cpu_notifier(fn, pri) do { (void)(fn); } while (0)
+
static inline int register_cpu_notifier(struct notifier_block *nb)
{
return 0;
@@ -130,7 +124,6 @@ static inline int __register_cpu_notifie
{
return 0;
}
-#endif
static inline void unregister_cpu_notifier(struct notifier_block *nb)
{
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -578,7 +578,6 @@ void __init cpuhp_threads_init(void)
kthread_unpark(this_cpu_read(cpuhp_state.thread));
}
-#ifdef CONFIG_HOTPLUG_CPU
EXPORT_SYMBOL(register_cpu_notifier);
EXPORT_SYMBOL(__register_cpu_notifier);
void unregister_cpu_notifier(struct notifier_block *nb)
@@ -595,6 +594,7 @@ void __unregister_cpu_notifier(struct no
}
EXPORT_SYMBOL(__unregister_cpu_notifier);
+#ifdef CONFIG_HOTPLUG_CPU
/**
* clear_tasks_mm_cpumask - Safely clear tasks' mm_cpumask for a CPU
* @cpu: a CPU id
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: David Michael <[email protected]>
commit 57891633eeef60e732e045731cf20e50ee80acb4 upstream.
Both asn1 headers are included by rsa_helper.c, so rsa_helper.o
should explicitly depend on them.
Signed-off-by: David Michael <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Cc: Tuomas Tynkkynen <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
crypto/Makefile | 1 +
1 file changed, 1 insertion(+)
--- a/crypto/Makefile
+++ b/crypto/Makefile
@@ -40,6 +40,7 @@ obj-$(CONFIG_CRYPTO_ECDH) += ecdh_generi
$(obj)/rsapubkey-asn1.o: $(obj)/rsapubkey-asn1.c $(obj)/rsapubkey-asn1.h
$(obj)/rsaprivkey-asn1.o: $(obj)/rsaprivkey-asn1.c $(obj)/rsaprivkey-asn1.h
+$(obj)/rsa_helper.o: $(obj)/rsapubkey-asn1.h $(obj)/rsaprivkey-asn1.h
clean-files += rsapubkey-asn1.c rsapubkey-asn1.h
clean-files += rsaprivkey-asn1.c rsaprivkey-asn1.h
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sven Eckelmann <[email protected]>
commit c2d0f48a13e53b4747704c9e692f5e765e52041a upstream.
batadv_tt_prepare_tvlv_local_data can fail to allocate the memory for the
new TVLV block. The caller is informed about this problem with the returned
length of 0. Not checking this value results in an invalid memory access
when either tt_data or tt_change is accessed.
Reported-by: Dan Carpenter <[email protected]>
Fixes: 7ea7b4a14275 ("batman-adv: make the TT CRC logic VLAN specific")
Signed-off-by: Sven Eckelmann <[email protected]>
Signed-off-by: Simon Wunderlich <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
net/batman-adv/translation-table.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/net/batman-adv/translation-table.c
+++ b/net/batman-adv/translation-table.c
@@ -2849,7 +2849,7 @@ static bool batadv_send_my_tt_response(s
&tvlv_tt_data,
&tt_change,
&tt_len);
- if (!tt_len)
+ if (!tt_len || !tvlv_len)
goto unlock;
/* Copy the last orig_node's OGM buffer */
@@ -2867,7 +2867,7 @@ static bool batadv_send_my_tt_response(s
&tvlv_tt_data,
&tt_change,
&tt_len);
- if (!tt_len)
+ if (!tt_len || !tvlv_len)
goto out;
/* fill the rest of the tvlv with the real TT entries */
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Stefan Agner <[email protected]>
commit 4b707fa00a80b19b80bc8df6f1cbf4bdd9c91402 upstream.
The eLCDIF IP of the i.MX 7 SoC knows multiple clocks and lists them
separately:
Clock Clock Root Description
apb_clk MAIN_AXI_CLK_ROOT AXI clock
pix_clk LCDIF_PIXEL_CLK_ROOT Pixel clock
ipg_clk_s MAIN_AXI_CLK_ROOT Peripheral access clock
All of them are switched by a single gate, which is part of the
IMX7D_LCDIF_PIXEL_ROOT_CLK clock. Hence using that clock also for
the AXI bus clock (clock-name "axi") makes sure the gate gets
enabled when accessing registers.
There seem to be no separate AXI display clock, and the clock is
optional. Hence remove the dummy clock.
This fixes kernel freezes when starting the X-Server (which
disables/re-enables the display controller).
Fixes: e8ed73f691bd ("ARM: dts: imx7d: add lcdif support")
Signed-off-by: Stefan Agner <[email protected]>
Reviewed-by: Fabio Estevam <[email protected]>
Acked-by: Shawn Guo <[email protected]>
Signed-off-by: Olof Johansson <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/arm/boot/dts/imx7s.dtsi | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
--- a/arch/arm/boot/dts/imx7s.dtsi
+++ b/arch/arm/boot/dts/imx7s.dtsi
@@ -640,9 +640,8 @@
reg = <0x30730000 0x10000>;
interrupts = <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>;
clocks = <&clks IMX7D_LCDIF_PIXEL_ROOT_CLK>,
- <&clks IMX7D_CLK_DUMMY>,
- <&clks IMX7D_CLK_DUMMY>;
- clock-names = "pix", "axi", "disp_axi";
+ <&clks IMX7D_LCDIF_PIXEL_ROOT_CLK>;
+ clock-names = "pix", "axi";
status = "disabled";
};
};
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Williams <[email protected]>
commit efda1b5d87cbc3d8816f94a3815b413f1868e10d upstream.
Given ambiguities in the ACPI 6.1 definition of the "Output (Size)"
field of the ARS (Address Range Scrub) Status command, a firmware
implementation may in practice return 0, 4, or 8 to indicate that there
is no output payload to process.
The specification states "Size of Output Buffer in bytes, including this
field.". However, 'Output Buffer' is also the name of the entire
payload, and earlier in the specification it states "Max Query ARS
Status Output Buffer Size: Maximum size of buffer (including the Status
and Extended Status fields)".
Without this fix if the BIOS happens to return 0 it causes memory
corruption as evidenced by this result from the acpi_nfit_ctl() unit
test.
ars_status00000000: 00020000 00000000 ........
BUG: stack guard page was hit at ffffc90001750000 (stack is ffffc9000174c000..ffffc9000174ffff)
kernel stack overflow (page fault): 0000 [#1] SMP DEBUG_PAGEALLOC
task: ffff8803332d2ec0 task.stack: ffffc9000174c000
RIP: 0010:[<ffffffff814cfe72>] [<ffffffff814cfe72>] __memcpy+0x12/0x20
RSP: 0018:ffffc9000174f9a8 EFLAGS: 00010246
RAX: ffffc9000174fab8 RBX: 0000000000000000 RCX: 000000001fffff56
RDX: 0000000000000000 RSI: ffff8803231f5a08 RDI: ffffc90001750000
RBP: ffffc9000174fa88 R08: ffffc9000174fab0 R09: ffff8803231f54b8
R10: 0000000000000008 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: ffff8803231f54a0
FS: 00007f3a611af640(0000) GS:ffff88033ed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffc90001750000 CR3: 0000000325b20000 CR4: 00000000000406e0
Stack:
ffffffffa00bc60d 0000000000000008 ffffc90000000001 ffffc9000174faac
0000000000000292 ffffffffa00c24e4 ffffffffa00c2914 0000000000000000
0000000000000000 ffffffff00000003 ffff880331ae8ad0 0000000800000246
Call Trace:
[<ffffffffa00bc60d>] ? acpi_nfit_ctl+0x49d/0x750 [nfit]
[<ffffffffa01f4fe0>] nfit_test_probe+0x670/0xb1b [nfit_test]
Fixes: 747ffe11b440 ("libnvdimm, tools/testing/nvdimm: fix 'ars_status' output buffer sizing")
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/nfit/core.c | 3 ++-
drivers/nvdimm/bus.c | 25 ++++++++++++++++++++-----
include/linux/libnvdimm.h | 2 +-
3 files changed, 23 insertions(+), 7 deletions(-)
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -298,7 +298,8 @@ static int acpi_nfit_ctl(struct nvdimm_b
for (i = 0, offset = 0; i < desc->out_num; i++) {
u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i, buf,
- (u32 *) out_obj->buffer.pointer);
+ (u32 *) out_obj->buffer.pointer,
+ out_obj->buffer.length - offset);
if (offset + out_size > out_obj->buffer.length) {
dev_dbg(dev, "%s:%s output object underflow cmd: %s field: %d\n",
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -715,7 +715,7 @@ EXPORT_SYMBOL_GPL(nd_cmd_in_size);
u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
- const u32 *out_field)
+ const u32 *out_field, unsigned long remainder)
{
if (idx >= desc->out_num)
return UINT_MAX;
@@ -727,9 +727,24 @@ u32 nd_cmd_out_size(struct nvdimm *nvdim
return in_field[1];
else if (nvdimm && cmd == ND_CMD_VENDOR && idx == 2)
return out_field[1];
- else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2)
- return out_field[1] - 8;
- else if (cmd == ND_CMD_CALL) {
+ else if (!nvdimm && cmd == ND_CMD_ARS_STATUS && idx == 2) {
+ /*
+ * Per table 9-276 ARS Data in ACPI 6.1, out_field[1] is
+ * "Size of Output Buffer in bytes, including this
+ * field."
+ */
+ if (out_field[1] < 4)
+ return 0;
+ /*
+ * ACPI 6.1 is ambiguous if 'status' is included in the
+ * output size. If we encounter an output size that
+ * overshoots the remainder by 4 bytes, assume it was
+ * including 'status'.
+ */
+ if (out_field[1] - 8 == remainder)
+ return remainder;
+ return out_field[1] - 4;
+ } else if (cmd == ND_CMD_CALL) {
struct nd_cmd_pkg *pkg = (struct nd_cmd_pkg *) in_field;
return pkg->nd_size_out;
@@ -876,7 +891,7 @@ static int __nd_ioctl(struct nvdimm_bus
/* process an output envelope */
for (i = 0; i < desc->out_num; i++) {
u32 out_size = nd_cmd_out_size(nvdimm, cmd, desc, i,
- (u32 *) in_env, (u32 *) out_env);
+ (u32 *) in_env, (u32 *) out_env, 0);
u32 copy;
if (out_size == UINT_MAX) {
--- a/include/linux/libnvdimm.h
+++ b/include/linux/libnvdimm.h
@@ -153,7 +153,7 @@ u32 nd_cmd_in_size(struct nvdimm *nvdimm
const struct nd_cmd_desc *desc, int idx, void *buf);
u32 nd_cmd_out_size(struct nvdimm *nvdimm, int cmd,
const struct nd_cmd_desc *desc, int idx, const u32 *in_field,
- const u32 *out_field);
+ const u32 *out_field, unsigned long remainder);
int nvdimm_bus_check_dimm_count(struct nvdimm_bus *nvdimm_bus, int dimm_count);
struct nd_region *nvdimm_pmem_region_create(struct nvdimm_bus *nvdimm_bus,
struct nd_region_desc *ndr_desc);
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Romain Perier <[email protected]>
commit 68c7f8c1c4e9b06e6b153fa3e9e0cda2ef5aaed8 upstream.
No need to copy the template of an hash operation twice into the SRAM
from the step function.
Fixes: commit 85030c5168f1 ("crypto: marvell - Add support for chai...")
Signed-off-by: Romain Perier <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/crypto/marvell/hash.c | 3 ---
1 file changed, 3 deletions(-)
--- a/drivers/crypto/marvell/hash.c
+++ b/drivers/crypto/marvell/hash.c
@@ -172,9 +172,6 @@ static void mv_cesa_ahash_std_step(struc
for (i = 0; i < digsize / 4; i++)
writel_relaxed(creq->state[i], engine->regs + CESA_IVDIG(i));
- mv_cesa_adjust_op(engine, &creq->op_tmpl);
- memcpy_toio(engine->sram, &creq->op_tmpl, sizeof(creq->op_tmpl));
-
if (creq->cache_ptr)
memcpy_toio(engine->sram + CESA_SA_DATA_SRAM_OFFSET,
creq->cache, creq->cache_ptr);
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Boris Brezillon <[email protected]>
commit 7e251bb21ae08ca2e4fb28cc0981fac2685a8efa upstream.
The current ndelay() macro definition has an extra semi-colon at the
end of the line thus leading to a compilation error when ndelay is used
in a conditional block without curly braces like this one:
if (cond)
ndelay(t);
else
...
which, after the preprocessor pass gives:
if (cond)
m68k_ndelay(t);;
else
...
thus leading to the following gcc error:
error: 'else' without a previous 'if'
Remove this extra semi-colon.
Signed-off-by: Boris Brezillon <[email protected]>
Fixes: c8ee038bd1488 ("m68k: Implement ndelay() based on the existing udelay() logic")
Signed-off-by: Geert Uytterhoeven <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/m68k/include/asm/delay.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/m68k/include/asm/delay.h
+++ b/arch/m68k/include/asm/delay.h
@@ -114,6 +114,6 @@ static inline void __udelay(unsigned lon
*/
#define HZSCALE (268435456 / (1000000 / HZ))
-#define ndelay(n) __delay(DIV_ROUND_UP((n) * ((((HZSCALE) >> 11) * (loops_per_jiffy >> 11)) >> 6), 1000));
+#define ndelay(n) __delay(DIV_ROUND_UP((n) * ((((HZSCALE) >> 11) * (loops_per_jiffy >> 11)) >> 6), 1000))
#endif /* defined(_M68K_DELAY_H) */
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jeff Layton <[email protected]>
commit c3f4688a08fd86f1bf8e055724c84b7a40a09733 upstream.
This function sets req->r_locked_dir which is supposed to indicate to
ceph_fill_trace that the parent's i_rwsem is locked for write.
Unfortunately, there is no guarantee that the dir will be locked when
d_revalidate is called, so we really don't want ceph_fill_trace to do
any dcache manipulation from this context. Clear req->r_locked_dir since
it's clearly not safe to do that.
What we really want to know with d_revalidate is whether the dentry
still points to the same inode. ceph_fill_trace installs a pointer to
the inode in req->r_target_inode, so we can just compare that to
d_inode(dentry) to see if it's the same one after the lookup.
Also, since we aren't generally interested in the parent here, we can
switch to using a GETATTR to hint that to the MDS, which also means that
we only need to reserve one cap.
Finally, just remove the d_unhashed check. That's really outside the
purview of a filesystem's d_revalidate. If the thing became unhashed
while we're checking it, then that's up to the VFS to handle anyway.
Fixes: 200fd27c8fa2 ("ceph: use lookup request to revalidate dentry")
Link: http://tracker.ceph.com/issues/18041
Reported-by: Donatas Abraitis <[email protected]>
Signed-off-by: Jeff Layton <[email protected]>
Reviewed-by: "Yan, Zheng" <[email protected]>
Signed-off-by: Ilya Dryomov <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/ceph/dir.c | 24 ++++++++++++++----------
1 file changed, 14 insertions(+), 10 deletions(-)
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -1257,26 +1257,30 @@ static int ceph_d_revalidate(struct dent
return -ECHILD;
op = ceph_snap(dir) == CEPH_SNAPDIR ?
- CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_LOOKUP;
+ CEPH_MDS_OP_LOOKUPSNAP : CEPH_MDS_OP_GETATTR;
req = ceph_mdsc_create_request(mdsc, op, USE_ANY_MDS);
if (!IS_ERR(req)) {
req->r_dentry = dget(dentry);
- req->r_num_caps = 2;
+ req->r_num_caps = op == CEPH_MDS_OP_GETATTR ? 1 : 2;
mask = CEPH_STAT_CAP_INODE | CEPH_CAP_AUTH_SHARED;
if (ceph_security_xattr_wanted(dir))
mask |= CEPH_CAP_XATTR_SHARED;
req->r_args.getattr.mask = mask;
- req->r_locked_dir = dir;
err = ceph_mdsc_do_request(mdsc, NULL, req);
- if (err == 0 || err == -ENOENT) {
- if (dentry == req->r_dentry) {
- valid = !d_unhashed(dentry);
- } else {
- d_invalidate(req->r_dentry);
- err = -EAGAIN;
- }
+ switch (err) {
+ case 0:
+ if (d_really_is_positive(dentry) &&
+ d_inode(dentry) == req->r_target_inode)
+ valid = 1;
+ break;
+ case -ENOENT:
+ if (d_really_is_negative(dentry))
+ valid = 1;
+ /* Fallthrough */
+ default:
+ break;
}
ceph_mdsc_put_request(req);
dout("d_revalidate %p lookup result=%d\n",
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andrew Donnellan <[email protected]>
commit 409bf7f8a02ef88db5a0f2cdcf9489914f4b8508 upstream.
In eeh_reset_device(), we take the pci_rescan_remove_lock immediately after
after we call eeh_reset_pe() to reset the PCI controller. We then call
eeh_clear_pe_frozen_state(), which can return an error. In this case, we
bail out of eeh_reset_device() without calling pci_unlock_rescan_remove().
Add a call to pci_unlock_rescan_remove() in the eeh_clear_pe_frozen_state()
error path so that we don't cause a deadlock later on.
Reported-by: Pradipta Ghosh <[email protected]>
Fixes: 78954700631f ("powerpc/eeh: Avoid I/O access during PE reset")
Signed-off-by: Andrew Donnellan <[email protected]>
Acked-by: Russell Currey <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/powerpc/kernel/eeh_driver.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -671,8 +671,10 @@ static int eeh_reset_device(struct eeh_p
/* Clear frozen state */
rc = eeh_clear_pe_frozen_state(pe, false);
- if (rc)
+ if (rc) {
+ pci_unlock_rescan_remove();
return rc;
+ }
/* Give the system 5 seconds to finish running the user-space
* hotplug shutdown scripts, e.g. ifdown for ethernet. Yes,
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Williams <[email protected]>
commit 325896ffdf90f7cbd59fb873b7ba20d60d1ddf3c upstream.
Hugh notes in response to commit 4cb19355ea19 "device-dax: fail all
private mapping attempts":
"I think that is more restrictive than you intended: haven't tried, but I
believe it rejects a PROT_READ, MAP_SHARED, O_RDONLY fd mmap, leaving no
way to mmap /dev/dax without write permission to it."
Indeed it does restrict read-only mappings, switch to checking
VM_MAYSHARE, not VM_SHARED.
Cc: Dave Hansen <[email protected]>
Cc: Pawel Lebioda <[email protected]>
Fixes: 4cb19355ea19 ("device-dax: fail all private mapping attempts")
Reported-by: Hugh Dickins <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/dax/dax.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -324,7 +324,7 @@ static int check_vma(struct dax_dev *dax
return -ENXIO;
/* prevent private mappings from being established */
- if ((vma->vm_flags & VM_SHARED) != VM_SHARED) {
+ if ((vma->vm_flags & VM_MAYSHARE) != VM_MAYSHARE) {
dev_info(dev, "%s: %s: fail, attempted private mapping\n",
current->comm, func);
return -EINVAL;
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Gleixner <[email protected]>
commit dbb26055defd03d59f678cb5f2c992abe05b064a upstream.
David reported a futex/rtmutex state corruption. It's caused by the
following problem:
CPU0 CPU1 CPU2
l->owner=T1
rt_mutex_lock(l)
lock(l->wait_lock)
l->owner = T1 | HAS_WAITERS;
enqueue(T2)
boost()
unlock(l->wait_lock)
schedule()
rt_mutex_lock(l)
lock(l->wait_lock)
l->owner = T1 | HAS_WAITERS;
enqueue(T3)
boost()
unlock(l->wait_lock)
schedule()
signal(->T2) signal(->T3)
lock(l->wait_lock)
dequeue(T2)
deboost()
unlock(l->wait_lock)
lock(l->wait_lock)
dequeue(T3)
===> wait list is now empty
deboost()
unlock(l->wait_lock)
lock(l->wait_lock)
fixup_rt_mutex_waiters()
if (wait_list_empty(l)) {
owner = l->owner & ~HAS_WAITERS;
l->owner = owner
==> l->owner = T1
}
lock(l->wait_lock)
rt_mutex_unlock(l) fixup_rt_mutex_waiters()
if (wait_list_empty(l)) {
owner = l->owner & ~HAS_WAITERS;
cmpxchg(l->owner, T1, NULL)
===> Success (l->owner = NULL)
l->owner = owner
==> l->owner = T1
}
That means the problem is caused by fixup_rt_mutex_waiters() which does the
RMW to clear the waiters bit unconditionally when there are no waiters in
the rtmutexes rbtree.
This can be fatal: A concurrent unlock can release the rtmutex in the
fastpath because the waiters bit is not set. If the cmpxchg() gets in the
middle of the RMW operation then the previous owner, which just unlocked
the rtmutex is set as the owner again when the write takes place after the
successfull cmpxchg().
The solution is rather trivial: verify that the owner member of the rtmutex
has the waiters bit set before clearing it. This does not require a
cmpxchg() or other atomic operations because the waiters bit can only be
set and cleared with the rtmutex wait_lock held. It's also safe against the
fast path unlock attempt. The unlock attempt via cmpxchg() will either see
the bit set and take the slowpath or see the bit cleared and release it
atomically in the fastpath.
It's remarkable that the test program provided by David triggers on ARM64
and MIPS64 really quick, but it refuses to reproduce on x86-64, while the
problem exists there as well. That refusal might explain that this got not
discovered earlier despite the bug existing from day one of the rtmutex
implementation more than 10 years ago.
Thanks to David for meticulously instrumenting the code and providing the
information which allowed to decode this subtle problem.
Reported-by: David Daney <[email protected]>
Tested-by: David Daney <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Steven Rostedt <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sebastian Siewior <[email protected]>
Cc: Will Deacon <[email protected]>
Fixes: 23f78d4a03c5 ("[PATCH] pi-futex: rt mutex core")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/locking/rtmutex.c | 68 +++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 66 insertions(+), 2 deletions(-)
--- a/kernel/locking/rtmutex.c
+++ b/kernel/locking/rtmutex.c
@@ -65,8 +65,72 @@ static inline void clear_rt_mutex_waiter
static void fixup_rt_mutex_waiters(struct rt_mutex *lock)
{
- if (!rt_mutex_has_waiters(lock))
- clear_rt_mutex_waiters(lock);
+ unsigned long owner, *p = (unsigned long *) &lock->owner;
+
+ if (rt_mutex_has_waiters(lock))
+ return;
+
+ /*
+ * The rbtree has no waiters enqueued, now make sure that the
+ * lock->owner still has the waiters bit set, otherwise the
+ * following can happen:
+ *
+ * CPU 0 CPU 1 CPU2
+ * l->owner=T1
+ * rt_mutex_lock(l)
+ * lock(l->lock)
+ * l->owner = T1 | HAS_WAITERS;
+ * enqueue(T2)
+ * boost()
+ * unlock(l->lock)
+ * block()
+ *
+ * rt_mutex_lock(l)
+ * lock(l->lock)
+ * l->owner = T1 | HAS_WAITERS;
+ * enqueue(T3)
+ * boost()
+ * unlock(l->lock)
+ * block()
+ * signal(->T2) signal(->T3)
+ * lock(l->lock)
+ * dequeue(T2)
+ * deboost()
+ * unlock(l->lock)
+ * lock(l->lock)
+ * dequeue(T3)
+ * ==> wait list is empty
+ * deboost()
+ * unlock(l->lock)
+ * lock(l->lock)
+ * fixup_rt_mutex_waiters()
+ * if (wait_list_empty(l) {
+ * l->owner = owner
+ * owner = l->owner & ~HAS_WAITERS;
+ * ==> l->owner = T1
+ * }
+ * lock(l->lock)
+ * rt_mutex_unlock(l) fixup_rt_mutex_waiters()
+ * if (wait_list_empty(l) {
+ * owner = l->owner & ~HAS_WAITERS;
+ * cmpxchg(l->owner, T1, NULL)
+ * ===> Success (l->owner = NULL)
+ *
+ * l->owner = owner
+ * ==> l->owner = T1
+ * }
+ *
+ * With the check for the waiter bit in place T3 on CPU2 will not
+ * overwrite. All tasks fiddling with the waiters bit are
+ * serialized by l->lock, so nothing else can modify the waiters
+ * bit. If the bit is set then nothing can change l->owner either
+ * so the simple RMW is safe. The cmpxchg() will simply fail if it
+ * happens in the middle of the RMW because the waiters bit is
+ * still set.
+ */
+ owner = READ_ONCE(*p);
+ if (owner & RT_MUTEX_HAS_WAITERS)
+ WRITE_ONCE(*p, owner & ~RT_MUTEX_HAS_WAITERS);
}
/*
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Thomas Gleixner <[email protected]>
commit 1be5d4fa0af34fb7bafa205aeb59f5c7cc7a089d upstream.
While debugging the rtmutex unlock vs. dequeue race Will suggested to use
READ_ONCE() in rt_mutex_owner() as it might race against the
cmpxchg_release() in unlock_rt_mutex_safe().
Will: "It's a minor thing which will most likely not matter in practice"
Careful search did not unearth an actual problem in todays code, but it's
better to be safe than surprised.
Suggested-by: Will Deacon <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Cc: David Daney <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sebastian Siewior <[email protected]>
Cc: Steven Rostedt <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/locking/rtmutex_common.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
--- a/kernel/locking/rtmutex_common.h
+++ b/kernel/locking/rtmutex_common.h
@@ -75,8 +75,9 @@ task_top_pi_waiter(struct task_struct *p
static inline struct task_struct *rt_mutex_owner(struct rt_mutex *lock)
{
- return (struct task_struct *)
- ((unsigned long)lock->owner & ~RT_MUTEX_OWNER_MASKALL);
+ unsigned long owner = (unsigned long) READ_ONCE(lock->owner);
+
+ return (struct task_struct *) (owner & ~RT_MUTEX_OWNER_MASKALL);
}
/*
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Sergey Senozhatsky <[email protected]>
commit 5c7e9ccd91b90d87029261f8856294ee51934cab upstream.
zram hot_add sysfs attribute is a very 'special' attribute - reading
from it creates a new uninitialized zram device. This file, by a
mistake, can be read by a 'normal' user at the moment, while only root
must be able to create a new zram device, therefore hot_add attribute
must have S_IRUSR mode, not S_IRUGO.
[[email protected]: s/sence/sense/, reflow comment to use 80 cols]
Fixes: 6566d1a32bf72 ("zram: add dynamic device add/remove functionality")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Sergey Senozhatsky <[email protected]>
Reported-by: Steven Allen <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Cc: Minchan Kim <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/block/zram/zram_drv.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1413,8 +1413,14 @@ static ssize_t hot_remove_store(struct c
return ret ? ret : count;
}
+/*
+ * NOTE: hot_add attribute is not the usual read-only sysfs attribute. In a
+ * sense that reading from this file does alter the state of your system -- it
+ * creates a new un-initialized zram device and returns back this device's
+ * device_id (or an error code if it fails to create a new device).
+ */
static struct class_attribute zram_control_class_attrs[] = {
- __ATTR_RO(hot_add),
+ __ATTR(hot_add, 0400, hot_add_show, NULL),
__ATTR_WO(hot_remove),
__ATTR_NULL,
};
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: John David Anglin <[email protected]>
commit febe42964fe182281859b3d43d844bb25ca49367 upstream.
We have four routines in pacache.S that use temporary alias pages:
copy_user_page_asm(), clear_user_page_asm(), flush_dcache_page_asm() and
flush_icache_page_asm(). copy_user_page_asm() and clear_user_page_asm()
don't purge the TLB entry used for the operation.
flush_dcache_page_asm() and flush_icache_page_asm do purge the entry.
Presumably, this was thought to optimize TLB use. However, the
operation is quite heavy weight on PA 1.X processors as we need to take
the TLB lock and a TLB broadcast is sent to all processors.
This patch removes the purges from flush_dcache_page_asm() and
flush_icache_page_asm.
Signed-off-by: John David Anglin <[email protected]>
Signed-off-by: Helge Deller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/parisc/kernel/pacache.S | 22 +---------------------
1 file changed, 1 insertion(+), 21 deletions(-)
--- a/arch/parisc/kernel/pacache.S
+++ b/arch/parisc/kernel/pacache.S
@@ -886,19 +886,10 @@ ENTRY(flush_dcache_page_asm)
fdc,m r31(%r28)
fdc,m r31(%r28)
fdc,m r31(%r28)
- cmpb,COND(<<) %r28, %r25,1b
+ cmpb,COND(<<) %r28, %r25,1b
fdc,m r31(%r28)
sync
-
-#ifdef CONFIG_PA20
- pdtlb,l %r0(%r25)
-#else
- tlb_lock %r20,%r21,%r22
- pdtlb %r0(%r25)
- tlb_unlock %r20,%r21,%r22
-#endif
-
bv %r0(%r2)
nop
.exit
@@ -973,17 +964,6 @@ ENTRY(flush_icache_page_asm)
fic,m %r31(%sr4,%r28)
sync
-
-#ifdef CONFIG_PA20
- pdtlb,l %r0(%r28)
- pitlb,l %r0(%sr4,%r25)
-#else
- tlb_lock %r20,%r21,%r22
- pdtlb %r0(%r28)
- pitlb %r0(%sr4,%r25)
- tlb_unlock %r20,%r21,%r22
-#endif
-
bv %r0(%r2)
nop
.exit
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Helge Deller <[email protected]>
commit 24d0492b7d5d321a9c5846c8c974eba9823ffaa0 upstream.
At bootup we run measurements to calculate the best threshold for when we
should be using full TLB flushes instead of just flushing a specific amount of
TLB entries. This performance test is run over the kernel text segment.
But running this TLB performance test on the kernel text segment turned out to
crash some SMP machines when the kernel text pages were mapped as huge pages.
To avoid those crashes this patch simply skips this test on some SMP machines
and calculates an optimal threshold based on the maximum number of available
TLB entries and number of online CPUs.
On a technical side, this seems to happen:
The TLB measurement code uses flush_tlb_kernel_range() to flush specific TLB
entries with a page size of 4k (pdtlb 0(sr1,addr)). On UP systems this purge
instruction seems to work without problems even if the pages were mapped as
huge pages. But on SMP systems the TLB purge instruction is broadcasted to
other CPUs. Those CPUs then crash the machine because the page size is not as
expected. C8000 machines with PA8800/PA8900 CPUs were not affected by this
problem, because the required cache coherency prohibits to use huge pages at
all. Sadly I didn't found any documentation about this behaviour, so this
finding is purely based on testing with phyiscal SMP machines (A500-44 and
J5000, both were 2-way boxes).
Signed-off-by: Helge Deller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/parisc/kernel/cache.c | 11 +++++++++++
1 file changed, 11 insertions(+)
--- a/arch/parisc/kernel/cache.c
+++ b/arch/parisc/kernel/cache.c
@@ -393,6 +393,15 @@ void __init parisc_setup_cache_timing(vo
/* calculate TLB flush threshold */
+ /* On SMP machines, skip the TLB measure of kernel text which
+ * has been mapped as huge pages. */
+ if (num_online_cpus() > 1 && !parisc_requires_coherency()) {
+ threshold = max(cache_info.it_size, cache_info.dt_size);
+ threshold *= PAGE_SIZE;
+ threshold /= num_online_cpus();
+ goto set_tlb_threshold;
+ }
+
alltime = mfctl(16);
flush_tlb_all();
alltime = mfctl(16) - alltime;
@@ -411,6 +420,8 @@ void __init parisc_setup_cache_timing(vo
alltime, size, rangetime);
threshold = PAGE_ALIGN(num_online_cpus() * size * alltime / rangetime);
+
+set_tlb_threshold:
if (threshold)
parisc_tlb_flush_threshold = threshold;
printk(KERN_INFO "TLB flush threshold set to %lu KiB\n",
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: John David Anglin <[email protected]>
commit c78e710c1c9fbeff43dddc0aa3d0ff458e70b0cc upstream.
The attached change interchanges the order of purging the TLB and
setting the corresponding page table entry. TLB purges are strongly
ordered. It occurred to me one night that setting the PTE first might
have subtle ordering issues on SMP machines and cause random memory
corruption.
A TLB lock guards the insertion of user TLB entries. So after the TLB
is purged, a new entry can't be inserted until the lock is released.
This ensures that the new PTE value is used when the lock is released.
Since making this change, no random segmentation faults have been
observed on the Debian hppa buildd servers.
Signed-off-by: John David Anglin <[email protected]>
Signed-off-by: Helge Deller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/parisc/include/asm/pgtable.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -65,9 +65,9 @@ static inline void purge_tlb_entries(str
unsigned long flags; \
spin_lock_irqsave(&pa_tlb_lock, flags); \
old_pte = *ptep; \
- set_pte(ptep, pteval); \
if (pte_inserted(old_pte)) \
purge_tlb_entries(mm, addr); \
+ set_pte(ptep, pteval); \
spin_unlock_irqrestore(&pa_tlb_lock, flags); \
} while (0)
@@ -478,8 +478,8 @@ static inline int ptep_test_and_clear_yo
spin_unlock_irqrestore(&pa_tlb_lock, flags);
return 0;
}
- set_pte(ptep, pte_mkold(pte));
purge_tlb_entries(vma->vm_mm, addr);
+ set_pte(ptep, pte_mkold(pte));
spin_unlock_irqrestore(&pa_tlb_lock, flags);
return 1;
}
@@ -492,9 +492,9 @@ static inline pte_t ptep_get_and_clear(s
spin_lock_irqsave(&pa_tlb_lock, flags);
old_pte = *ptep;
- set_pte(ptep, __pte(0));
if (pte_inserted(old_pte))
purge_tlb_entries(mm, addr);
+ set_pte(ptep, __pte(0));
spin_unlock_irqrestore(&pa_tlb_lock, flags);
return old_pte;
@@ -504,8 +504,8 @@ static inline void ptep_set_wrprotect(st
{
unsigned long flags;
spin_lock_irqsave(&pa_tlb_lock, flags);
- set_pte(ptep, pte_wrprotect(*ptep));
purge_tlb_entries(mm, addr);
+ set_pte(ptep, pte_wrprotect(*ptep));
spin_unlock_irqrestore(&pa_tlb_lock, flags);
}
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Dan Williams <[email protected]>
commit 82aa37cf09867c5e2c0326649d570e5b25c1189a upstream.
If an ARS Status command returns truncated output, do not process
partial records or otherwise consume non-status fields.
Fixes: 0caeef63e6d2 ("libnvdimm: Add a poison list and export badblocks")
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/nfit/core.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -146,7 +146,8 @@ static int xlat_status(void *buf, unsign
* then just continue with the returned results.
*/
if (status == NFIT_ARS_STATUS_INTR) {
- if (ars_status->flags & NFIT_ARS_F_OVERFLOW)
+ if (ars_status->out_length >= 40 && (ars_status->flags
+ & NFIT_ARS_F_OVERFLOW))
return -ENOSPC;
return 0;
}
@@ -1858,19 +1859,32 @@ static int ars_get_status(struct acpi_nf
return cmd_rc;
}
-static int ars_status_process_records(struct nvdimm_bus *nvdimm_bus,
+static int ars_status_process_records(struct acpi_nfit_desc *acpi_desc,
struct nd_cmd_ars_status *ars_status)
{
+ struct nvdimm_bus *nvdimm_bus = acpi_desc->nvdimm_bus;
int rc;
u32 i;
+ /*
+ * First record starts at 44 byte offset from the start of the
+ * payload.
+ */
+ if (ars_status->out_length < 44)
+ return 0;
for (i = 0; i < ars_status->num_records; i++) {
+ /* only process full records */
+ if (ars_status->out_length
+ < 44 + sizeof(struct nd_ars_record) * (i + 1))
+ break;
rc = nvdimm_bus_add_poison(nvdimm_bus,
ars_status->records[i].err_address,
ars_status->records[i].length);
if (rc)
return rc;
}
+ if (i < ars_status->num_records)
+ dev_warn(acpi_desc->dev, "detected truncated ars results\n");
return 0;
}
@@ -2123,8 +2137,7 @@ static int acpi_nfit_query_poison(struct
if (rc < 0 && rc != -ENOSPC)
return rc;
- if (ars_status_process_records(acpi_desc->nvdimm_bus,
- acpi_desc->ars_status))
+ if (ars_status_process_records(acpi_desc, acpi_desc->ars_status))
return -ENOMEM;
return 0;
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Rafael J. Wysocki <[email protected]>
commit 9713adc2a1a5488f4889c657a0c0ce0c16056d3c upstream.
Revert commit 2c85025c75df (ACPI: Execute _PTS before system reboot)
as it is reported to cause poweroff and reboot to hang on Dell
Latitude E7250.
Link: https://bugzilla.kernel.org/show_bug.cgi?id=187061
Reported-by: Gianpaolo <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/sleep.c | 29 ++++++-----------------------
1 file changed, 6 insertions(+), 23 deletions(-)
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -47,32 +47,15 @@ static void acpi_sleep_tts_switch(u32 ac
}
}
-static void acpi_sleep_pts_switch(u32 acpi_state)
-{
- acpi_status status;
-
- status = acpi_execute_simple_method(NULL, "\\_PTS", acpi_state);
- if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
- /*
- * OS can't evaluate the _PTS object correctly. Some warning
- * message will be printed. But it won't break anything.
- */
- printk(KERN_NOTICE "Failure in evaluating _PTS object\n");
- }
-}
-
-static int sleep_notify_reboot(struct notifier_block *this,
+static int tts_notify_reboot(struct notifier_block *this,
unsigned long code, void *x)
{
acpi_sleep_tts_switch(ACPI_STATE_S5);
-
- acpi_sleep_pts_switch(ACPI_STATE_S5);
-
return NOTIFY_DONE;
}
-static struct notifier_block sleep_notifier = {
- .notifier_call = sleep_notify_reboot,
+static struct notifier_block tts_notifier = {
+ .notifier_call = tts_notify_reboot,
.next = NULL,
.priority = 0,
};
@@ -916,9 +899,9 @@ int __init acpi_sleep_init(void)
pr_info(PREFIX "(supports%s)\n", supported);
/*
- * Register the sleep_notifier to reboot notifier list so that the _TTS
- * and _PTS object can also be evaluated when the system enters S5.
+ * Register the tts_notifier to reboot notifier list so that the _TTS
+ * object can also be evaluated when the system enters S5.
*/
- register_reboot_notifier(&sleep_notifier);
+ register_reboot_notifier(&tts_notifier);
return 0;
}
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Marc Kleine-Budde <[email protected]>
commit 332b05ca7a438f857c61a3c21a88489a21532364 upstream.
This patch adds a check to limit the number of can_filters that can be
set via setsockopt on CAN_RAW sockets. Otherwise allocations > MAX_ORDER
are not prevented resulting in a warning.
Reference: https://lkml.org/lkml/2016/12/2/230
Reported-by: Andrey Konovalov <[email protected]>
Tested-by: Andrey Konovalov <[email protected]>
Signed-off-by: Marc Kleine-Budde <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
include/uapi/linux/can.h | 1 +
net/can/raw.c | 3 +++
2 files changed, 4 insertions(+)
--- a/include/uapi/linux/can.h
+++ b/include/uapi/linux/can.h
@@ -196,5 +196,6 @@ struct can_filter {
};
#define CAN_INV_FILTER 0x20000000U /* to be set in can_filter.can_id */
+#define CAN_RAW_FILTER_MAX 512 /* maximum number of can_filter set via setsockopt() */
#endif /* !_UAPI_CAN_H */
--- a/net/can/raw.c
+++ b/net/can/raw.c
@@ -499,6 +499,9 @@ static int raw_setsockopt(struct socket
if (optlen % sizeof(struct can_filter) != 0)
return -EINVAL;
+ if (optlen > CAN_RAW_FILTER_MAX * sizeof(struct can_filter))
+ return -EINVAL;
+
count = optlen / sizeof(struct can_filter);
if (count > 1) {
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Romain Perier <[email protected]>
commit 9e5f7a149e00d211177f6de8be427ebc72a1c363 upstream.
mv_cesa_hash_std_step() copies the creq->state into the SRAM at each
step, but this is only required on the first one. By doing that, we
overwrite the engine state, and get erroneous results when the crypto
request is split in several chunks to fit in the internal SRAM.
This commit changes the function to copy the state only on the first
step.
Fixes: commit 2786cee8e50b ("crypto: marvell - Move SRAM I/O op...")
Signed-off-by: Romain Perier <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/crypto/marvell/hash.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/drivers/crypto/marvell/hash.c
+++ b/drivers/crypto/marvell/hash.c
@@ -168,9 +168,11 @@ static void mv_cesa_ahash_std_step(struc
mv_cesa_adjust_op(engine, &creq->op_tmpl);
memcpy_toio(engine->sram, &creq->op_tmpl, sizeof(creq->op_tmpl));
- digsize = crypto_ahash_digestsize(crypto_ahash_reqtfm(req));
- for (i = 0; i < digsize / 4; i++)
- writel_relaxed(creq->state[i], engine->regs + CESA_IVDIG(i));
+ if (!sreq->offset) {
+ digsize = crypto_ahash_digestsize(crypto_ahash_reqtfm(req));
+ for (i = 0; i < digsize / 4; i++)
+ writel_relaxed(creq->state[i], engine->regs + CESA_IVDIG(i));
+ }
if (creq->cache_ptr)
memcpy_toio(engine->sram + CESA_SA_DATA_SRAM_OFFSET,
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: tim <[email protected]>
commit 48a992727d82cb7db076fa15d372178743b1f4cd upstream.
Algorithms not compatible with mcryptd could be spawned by mcryptd
with a direct crypto_alloc_tfm invocation using a "mcryptd(alg)" name
construct. This causes mcryptd to crash the kernel if an arbitrary
"alg" is incompatible and not intended to be used with mcryptd. It is
an issue if AF_ALG tries to spawn mcryptd(alg) to expose it externally.
But such algorithms must be used internally and not be exposed.
We added a check to enforce that only internal algorithms are allowed
with mcryptd at the time mcryptd is spawning an algorithm.
Link: http://marc.info/?l=linux-crypto-vger&m=148063683310477&w=2
Reported-by: Mikulas Patocka <[email protected]>
Signed-off-by: Tim Chen <[email protected]>
Signed-off-by: Herbert Xu <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
crypto/mcryptd.c | 19 ++++++++++++-------
1 file changed, 12 insertions(+), 7 deletions(-)
--- a/crypto/mcryptd.c
+++ b/crypto/mcryptd.c
@@ -254,18 +254,22 @@ out_free_inst:
goto out;
}
-static inline void mcryptd_check_internal(struct rtattr **tb, u32 *type,
+static inline bool mcryptd_check_internal(struct rtattr **tb, u32 *type,
u32 *mask)
{
struct crypto_attr_type *algt;
algt = crypto_get_attr_type(tb);
if (IS_ERR(algt))
- return;
- if ((algt->type & CRYPTO_ALG_INTERNAL))
- *type |= CRYPTO_ALG_INTERNAL;
- if ((algt->mask & CRYPTO_ALG_INTERNAL))
- *mask |= CRYPTO_ALG_INTERNAL;
+ return false;
+
+ *type |= algt->type & CRYPTO_ALG_INTERNAL;
+ *mask |= algt->mask & CRYPTO_ALG_INTERNAL;
+
+ if (*type & *mask & CRYPTO_ALG_INTERNAL)
+ return true;
+ else
+ return false;
}
static int mcryptd_hash_init_tfm(struct crypto_tfm *tfm)
@@ -492,7 +496,8 @@ static int mcryptd_create_hash(struct cr
u32 mask = 0;
int err;
- mcryptd_check_internal(tb, &type, &mask);
+ if (!mcryptd_check_internal(tb, &type, &mask))
+ return -EINVAL;
halg = ahash_attr_alg(tb[1], type, mask);
if (IS_ERR(halg))
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Miklos Szeredi <[email protected]>
commit c01638f5d919728f565bf8b5e0a6a159642df0d9 upstream.
Basically, the pjdfstests set the ownership of a file to 06555, and then
chowns it (as root) to a new uid/gid. Prior to commit a09f99eddef4 ("fuse:
fix killing s[ug]id in setattr"), fuse would send down a setattr with both
the uid/gid change and a new mode. Now, it just sends down the uid/gid
change.
Technically this is NOTABUG, since POSIX doesn't _require_ that we clear
these bits for a privileged process, but Linux (wisely) has done that and I
think we don't want to change that behavior here.
This is caused by the use of should_remove_suid(), which will always return
0 when the process has CAP_FSETID.
In fact we really don't need to be calling should_remove_suid() at all,
since we've already been indicated that we should remove the suid, we just
don't want to use a (very) stale mode for that.
This patch should fix the above as well as simplify the logic.
Reported-by: Jeff Layton <[email protected]>
Signed-off-by: Miklos Szeredi <[email protected]>
Fixes: a09f99eddef4 ("fuse: fix killing s[ug]id in setattr")
Reviewed-by: Jeff Layton <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
fs/fuse/dir.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1709,8 +1709,6 @@ static int fuse_setattr(struct dentry *e
return -EACCES;
if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) {
- int kill;
-
attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID |
ATTR_MODE);
/*
@@ -1722,12 +1720,11 @@ static int fuse_setattr(struct dentry *e
return ret;
attr->ia_mode = inode->i_mode;
- kill = should_remove_suid(entry);
- if (kill & ATTR_KILL_SUID) {
+ if (inode->i_mode & S_ISUID) {
attr->ia_valid |= ATTR_MODE;
attr->ia_mode &= ~S_ISUID;
}
- if (kill & ATTR_KILL_SGID) {
+ if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
attr->ia_valid |= ATTR_MODE;
attr->ia_mode &= ~S_ISGID;
}
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Peng Tao <[email protected]>
commit c4587631c7bad47c045e081d1553cd73a23be59a upstream.
local_addr.svm_cid is host cid. We should check guest cid instead,
which is remote_addr.svm_cid. Otherwise we end up resetting all
connections to all guests.
Reviewed-by: Stefan Hajnoczi <[email protected]>
Signed-off-by: Peng Tao <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/vhost/vsock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/vhost/vsock.c
+++ b/drivers/vhost/vsock.c
@@ -506,7 +506,7 @@ static void vhost_vsock_reset_orphans(st
* executing.
*/
- if (!vhost_vsock_get(vsk->local_addr.svm_cid)) {
+ if (!vhost_vsock_get(vsk->remote_addr.svm_cid)) {
sock_set_flag(sk, SOCK_DONE);
vsk->peer_shutdown = SHUTDOWN_MASK;
sk->sk_state = SS_UNCONNECTED;
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Peter Zijlstra (Intel) <[email protected]>
commit 7f612a7f0bc13a2361a152862435b7941156b6af upstream.
Lukasz reported that perf stat counters overflow handling is broken on KNL/SLM.
Both these parts have full_width_write set, and that does indeed have
a problem. In order to deal with counter wrap, we must sample the
counter at at least half the counter period (see also the sampling
theorem) such that we can unambiguously reconstruct the count.
However commit:
069e0c3c4058 ("perf/x86/intel: Support full width counting")
sets the sampling interval to the full period, not half.
Fixing that exposes another issue, in that we must not sign extend the
delta value when we shift it right; the counter cannot have
decremented after all.
With both these issues fixed, counter overflow functions correctly
again.
Reported-by: Lukasz Odzioba <[email protected]>
Tested-by: Liang, Kan <[email protected]>
Tested-by: Odzioba, Lukasz <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vince Weaver <[email protected]>
Fixes: 069e0c3c4058 ("perf/x86/intel: Support full width counting")
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/x86/events/core.c | 2 +-
arch/x86/events/intel/core.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -68,7 +68,7 @@ u64 x86_perf_event_update(struct perf_ev
int shift = 64 - x86_pmu.cntval_bits;
u64 prev_raw_count, new_raw_count;
int idx = hwc->idx;
- s64 delta;
+ u64 delta;
if (idx == INTEL_PMC_IDX_FIXED_BTS)
return 0;
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -4024,7 +4024,7 @@ __init int intel_pmu_init(void)
/* Support full width counters using alternative MSR range */
if (x86_pmu.intel_cap.full_width_write) {
- x86_pmu.max_period = x86_pmu.cntval_mask;
+ x86_pmu.max_period = x86_pmu.cntval_mask >> 1;
x86_pmu.perfctr = MSR_IA32_PMC0;
pr_cont("full-width counters, ");
}
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Vishal Verma <[email protected]>
commit 9a901f5495e26e691c7d0ea7b6057a2f3e6330ed upstream.
ACPI DSMs can have an 'extended' status which can be non-zero to convey
additional information about the command. In the xlat_status routine,
where we translate the command statuses, we were returning an error for
a non-zero extended status, even if the primary status indicated success.
Return from each command's 'case' once we have verified both its status
and extend status are good.
Fixes: 11294d63ac91 ("nfit: fail DSMs that return non-zero status by default")
Signed-off-by: Vishal Verma <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/acpi/nfit/core.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -113,7 +113,7 @@ static int xlat_status(void *buf, unsign
flags = ND_ARS_PERSISTENT | ND_ARS_VOLATILE;
if ((status >> 16 & flags) == 0)
return -ENOTTY;
- break;
+ return 0;
case ND_CMD_ARS_START:
/* ARS is in progress */
if ((status & 0xffff) == NFIT_ARS_START_BUSY)
@@ -122,7 +122,7 @@ static int xlat_status(void *buf, unsign
/* Command failed */
if (status & 0xffff)
return -EIO;
- break;
+ return 0;
case ND_CMD_ARS_STATUS:
ars_status = buf;
/* Command failed */
@@ -154,7 +154,7 @@ static int xlat_status(void *buf, unsign
/* Unknown status */
if (status >> 16)
return -EIO;
- break;
+ return 0;
case ND_CMD_CLEAR_ERROR:
clear_err = buf;
if (status & 0xffff)
@@ -163,7 +163,7 @@ static int xlat_status(void *buf, unsign
return -EIO;
if (clear_err->length > clear_err->cleared)
return clear_err->cleared;
- break;
+ return 0;
default:
break;
}
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mike Galbraith <[email protected]>
commit 83929cce95251cc77e5659bf493bd424ae0e7a67 upstream.
Michael Kerrisk reported:
> Regarding the previous paragraph... My tests indicate
> that writing *any* value to the autogroup [nice priority level]
> file causes the task group to get a lower priority.
Because autogroup didn't call the then meaningless scale_load()...
Autogroup nice level adjustment has been broken ever since load
resolution was increased for 64-bit kernels. Use scale_load() to
scale group weight.
Michael Kerrisk tested this patch to fix the problem:
> Applied and tested against 4.9-rc6 on an Intel u7 (4 cores).
> Test setup:
>
> Terminal window 1: running 40 CPU burner jobs
> Terminal window 2: running 40 CPU burner jobs
> Terminal window 1: running 1 CPU burner job
>
> Demonstrated that:
> * Writing "0" to the autogroup file for TW1 now causes no change
> to the rate at which the process on the terminal consume CPU.
> * Writing -20 to the autogroup file for TW1 caused those processes
> to get the lion's share of CPU while TW2 TW3 get a tiny amount.
> * Writing -20 to the autogroup files for TW1 and TW3 allowed the
> process on TW3 to get as much CPU as it was getting as when
> the autogroup nice values for both terminals were 0.
Reported-by: Michael Kerrisk <[email protected]>
Tested-by: Michael Kerrisk <[email protected]>
Signed-off-by: Mike Galbraith <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: linux-man <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
kernel/sched/auto_group.c | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
--- a/kernel/sched/auto_group.c
+++ b/kernel/sched/auto_group.c
@@ -192,6 +192,7 @@ int proc_sched_autogroup_set_nice(struct
{
static unsigned long next = INITIAL_JIFFIES;
struct autogroup *ag;
+ unsigned long shares;
int err;
if (nice < MIN_NICE || nice > MAX_NICE)
@@ -210,9 +211,10 @@ int proc_sched_autogroup_set_nice(struct
next = HZ / 10 + jiffies;
ag = autogroup_task_get(p);
+ shares = scale_load(sched_prio_to_weight[nice + 20]);
down_write(&ag->lock);
- err = sched_group_set_shares(ag->tg, sched_prio_to_weight[nice + 20]);
+ err = sched_group_set_shares(ag->tg, shares);
if (!err)
ag->nice = nice;
up_write(&ag->lock);
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Ben Hutchings <[email protected]>
commit 10c77dba40ff58fc03587b3b60725bb7fd723183 upstream.
OPAL is not callable from 32-bit mode and the assembly code for it
may not even build (depending on how binutils was configured).
References: https://buildd.debian.org/status/fetch.php?pkg=linux&arch=powerpcspe&ver=4.8.7-1&stamp=1479203712
Fixes: 656ad58ef19e ("powerpc/boot: Add OPAL console to epapr wrappers")
Signed-off-by: Ben Hutchings <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
arch/powerpc/boot/Makefile | 3 ++-
arch/powerpc/boot/opal.c | 2 +-
2 files changed, 3 insertions(+), 2 deletions(-)
--- a/arch/powerpc/boot/Makefile
+++ b/arch/powerpc/boot/Makefile
@@ -78,7 +78,8 @@ src-wlib-y := string.S crt0.S crtsavres.
ns16550.c serial.c simple_alloc.c div64.S util.S \
gunzip_util.c elf_util.c $(zlib) devtree.c stdlib.c \
oflib.c ofconsole.c cuboot.c mpsc.c cpm-serial.c \
- uartlite.c mpc52xx-psc.c opal.c opal-calls.S
+ uartlite.c mpc52xx-psc.c opal.c
+src-wlib-$(CONFIG_PPC64_BOOT_WRAPPER) += opal-calls.S
src-wlib-$(CONFIG_40x) += 4xx.c planetcore.c
src-wlib-$(CONFIG_44x) += 4xx.c ebony.c bamboo.c
src-wlib-$(CONFIG_8xx) += mpc8xx.c planetcore.c fsl-soc.c
--- a/arch/powerpc/boot/opal.c
+++ b/arch/powerpc/boot/opal.c
@@ -13,7 +13,7 @@
#include <libfdt.h>
#include "../include/asm/opal-api.h"
-#ifdef __powerpc64__
+#ifdef CONFIG_PPC64_BOOT_WRAPPER
/* Global OPAL struct used by opal-call.S */
struct opal {
4.8-stable review patch. If anyone has any objections, please let me know.
------------------
From: Mauricio Faria de Oliveira <[email protected]>
commit 2319f847a8910cff1d46c9b66aa1dd7cc3e836a9 upstream.
The BUG_ON() recently introduced in lpfc_sli_ringtxcmpl_put() is hit in
the lpfc_els_abort() > lpfc_sli_issue_abort_iotag() >
lpfc_sli_abort_iotag_issue() function path [similar names], due to
'piocb->vport == NULL':
BUG_ON(!piocb || !piocb->vport);
This happens because lpfc_sli_abort_iotag_issue() doesn't set the
'abtsiocbp->vport' pointer -- but this is not the problem.
Previously, lpfc_sli_ringtxcmpl_put() accessed 'piocb->vport' only if
'piocb->iocb.ulpCommand' is neither CMD_ABORT_XRI_CN nor
CMD_CLOSE_XRI_CN, which are the only possible values for
lpfc_sli_abort_iotag_issue():
lpfc_sli_ringtxcmpl_put():
if ((unlikely(pring->ringno == LPFC_ELS_RING)) &&
(piocb->iocb.ulpCommand != CMD_ABORT_XRI_CN) &&
(piocb->iocb.ulpCommand != CMD_CLOSE_XRI_CN) &&
(!(piocb->vport->load_flag & FC_UNLOADING)))
lpfc_sli_abort_iotag_issue():
if (phba->link_state >= LPFC_LINK_UP)
iabt->ulpCommand = CMD_ABORT_XRI_CN;
else
iabt->ulpCommand = CMD_CLOSE_XRI_CN;
So, this function path would not have hit this possible NULL pointer
dereference before.
In order to fix this regression, move the second part of the BUG_ON()
check prior to the pointer dereference that it does check for.
For reference, this is the stack trace observed. The problem happened
because an unsolicited event was received - a PLOGI was received after
our PLOGI was issued but not yet complete, so the discovery state
machine goes on to sw-abort our PLOGI.
kernel BUG at drivers/scsi/lpfc/lpfc_sli.c:1326!
Oops: Exception in kernel mode, sig: 5 [#1]
<...>
NIP [...] lpfc_sli_ringtxcmpl_put+0x1c/0xf0 [lpfc]
LR [...] __lpfc_sli_issue_iocb_s4+0x188/0x200 [lpfc]
Call Trace:
[...] [...] __lpfc_sli_issue_iocb_s4+0xb0/0x200 [lpfc] (unreliable)
[...] [...] lpfc_sli_issue_abort_iotag+0x2b4/0x350 [lpfc]
[...] [...] lpfc_els_abort+0x1a8/0x4a0 [lpfc]
[...] [...] lpfc_rcv_plogi+0x6d4/0x700 [lpfc]
[...] [...] lpfc_rcv_plogi_plogi_issue+0xd8/0x1d0 [lpfc]
[...] [...] lpfc_disc_state_machine+0xc0/0x2b0 [lpfc]
[...] [...] lpfc_els_unsol_buffer+0xcc0/0x26c0 [lpfc]
[...] [...] lpfc_els_unsol_event+0xa8/0x220 [lpfc]
[...] [...] lpfc_complete_unsol_iocb+0xb8/0x138 [lpfc]
[...] [...] lpfc_sli4_handle_received_buffer+0x6a0/0xec0 [lpfc]
[...] [...] lpfc_sli_handle_slow_ring_event_s4+0x1c4/0x240 [lpfc]
[...] [...] lpfc_sli_handle_slow_ring_event+0x24/0x40 [lpfc]
[...] [...] lpfc_do_work+0xd88/0x1970 [lpfc]
[...] [...] kthread+0x108/0x130
[...] [...] ret_from_kernel_thread+0x5c/0xbc
<...>
Fixes: 22466da5b4b7 ("lpfc: Fix possible NULL pointer dereference")
Reported-by: Harsha Thyagaraja <[email protected]>
Signed-off-by: Mauricio Faria de Oliveira <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/scsi/lpfc/lpfc_sli.c | 14 ++++++++------
1 file changed, 8 insertions(+), 6 deletions(-)
--- a/drivers/scsi/lpfc/lpfc_sli.c
+++ b/drivers/scsi/lpfc/lpfc_sli.c
@@ -1323,18 +1323,20 @@ lpfc_sli_ringtxcmpl_put(struct lpfc_hba
{
lockdep_assert_held(&phba->hbalock);
- BUG_ON(!piocb || !piocb->vport);
+ BUG_ON(!piocb);
list_add_tail(&piocb->list, &pring->txcmplq);
piocb->iocb_flag |= LPFC_IO_ON_TXCMPLQ;
if ((unlikely(pring->ringno == LPFC_ELS_RING)) &&
(piocb->iocb.ulpCommand != CMD_ABORT_XRI_CN) &&
- (piocb->iocb.ulpCommand != CMD_CLOSE_XRI_CN) &&
- (!(piocb->vport->load_flag & FC_UNLOADING)))
- mod_timer(&piocb->vport->els_tmofunc,
- jiffies +
- msecs_to_jiffies(1000 * (phba->fc_ratov << 1)));
+ (piocb->iocb.ulpCommand != CMD_CLOSE_XRI_CN)) {
+ BUG_ON(!piocb->vport);
+ if (!(piocb->vport->load_flag & FC_UNLOADING))
+ mod_timer(&piocb->vport->els_tmofunc,
+ jiffies +
+ msecs_to_jiffies(1000 * (phba->fc_ratov << 1)));
+ }
return 0;
}
On 12/13/2016 10:16 AM, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 4.8.15 release.
> There are 33 patches in this series, all will be posted as a response
> to this one. If anyone has any issues with these being applied, please
> let me know.
>
> Responses should be made by Thu Dec 15 17:15:24 UTC 2016.
> Anything received after that time might be too late.
>
> The whole patch series can be found in one patch at:
> kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.8.15-rc1.gz
> or in the git tree and branch at:
> git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.8.y
> and the diffstat can be found below.
>
> thanks,
>
> greg k-h
>
Compiled and booted on my test system. No dmesg regressions.
thanks,
-- Shuah
--
Shuah Khan
Sr. Linux Kernel Developer
Open Source Innovation Group
Samsung Research America(Silicon Valley)
[email protected]
On Tue, Dec 13, 2016 at 12:32:17PM -0700, Shuah Khan wrote:
> On 12/13/2016 10:16 AM, Greg Kroah-Hartman wrote:
> > This is the start of the stable review cycle for the 4.8.15 release.
> > There are 33 patches in this series, all will be posted as a response
> > to this one. If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Thu Dec 15 17:15:24 UTC 2016.
> > Anything received after that time might be too late.
> >
> > The whole patch series can be found in one patch at:
> > kernel.org/pub/linux/kernel/v4.x/stable-review/patch-4.8.15-rc1.gz
> > or in the git tree and branch at:
> > git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git linux-4.8.y
> > and the diffstat can be found below.
> >
> > thanks,
> >
> > greg k-h
> >
>
> Compiled and booted on my test system. No dmesg regressions.
Thanks for testing both of these and letting me know.
greg k-h
On 12/13/2016 09:16 AM, Greg Kroah-Hartman wrote:
> This is the start of the stable review cycle for the 4.8.15 release.
> There are 33 patches in this series, all will be posted as a response
> to this one. If anyone has any issues with these being applied, please
> let me know.
>
> Responses should be made by Thu Dec 15 17:15:24 UTC 2016.
> Anything received after that time might be too late.
>
Build results:
total: 149 pass: 149 fail: 0
Qemu test results:
total: 122 pass: 122 fail: 0
Details are available at http://kerneltests.org/builders.
Guenter
On Tue, Dec 13, 2016 at 08:13:01PM -0800, Guenter Roeck wrote:
> On 12/13/2016 09:16 AM, Greg Kroah-Hartman wrote:
> > This is the start of the stable review cycle for the 4.8.15 release.
> > There are 33 patches in this series, all will be posted as a response
> > to this one. If anyone has any issues with these being applied, please
> > let me know.
> >
> > Responses should be made by Thu Dec 15 17:15:24 UTC 2016.
> > Anything received after that time might be too late.
> >
>
> Build results:
> total: 149 pass: 149 fail: 0
> Qemu test results:
> total: 122 pass: 122 fail: 0
>
> Details are available at http://kerneltests.org/builders.
Great, thanks for testing these and letting me know.
greg k-h