* [PATCH] net/mlx5: fix a -Wstringop-truncation warning
@ 2019-08-23 19:56 Qian Cai
2019-08-23 22:18 ` David Miller
` (2 more replies)
0 siblings, 3 replies; 7+ messages in thread
From: Qian Cai @ 2019-08-23 19:56 UTC (permalink / raw)
To: saeedm
Cc: leon, davem, moshe, ferasda, eranbe, netdev, linux-rdma,
linux-kernel, Qian Cai
In file included from ./arch/powerpc/include/asm/paca.h:15,
from ./arch/powerpc/include/asm/current.h:13,
from ./include/linux/thread_info.h:21,
from ./include/asm-generic/preempt.h:5,
from ./arch/powerpc/include/generated/asm/preempt.h:1,
from ./include/linux/preempt.h:78,
from ./include/linux/spinlock.h:51,
from ./include/linux/wait.h:9,
from ./include/linux/completion.h:12,
from ./include/linux/mlx5/driver.h:37,
from
drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h:6,
from
drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:33:
In function 'strncpy',
inlined from 'mlx5_fw_tracer_save_trace' at
drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:549:2,
inlined from 'mlx5_tracer_print_trace' at
drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:574:2:
./include/linux/string.h:305:9: warning: '__builtin_strncpy' output may
be truncated copying 256 bytes from a string of length 511
[-Wstringop-truncation]
return __builtin_strncpy(p, q, size);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fix it by using the new strscpy_pad() since the commit 458a3bf82df4
("lib/string: Add strscpy_pad() function") which will always
NUL-terminate the string, and avoid possibly leak data through the ring
buffer where non-admin account might enable these events through perf.
Fixes: fd1483fe1f9f ("net/mlx5: Add support for FW reporter dump")
Signed-off-by: Qian Cai <cai@lca.pw>
---
drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
index 8a4930c8bf62..2011eaf15cc5 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c
@@ -546,7 +546,7 @@ static void mlx5_fw_tracer_save_trace(struct mlx5_fw_tracer *tracer,
trace_data->timestamp = timestamp;
trace_data->lost = lost;
trace_data->event_id = event_id;
- strncpy(trace_data->msg, msg, TRACE_STR_MSG);
+ strscpy_pad(trace_data->msg, msg, TRACE_STR_MSG);
tracer->st_arr.saved_traces_index =
(tracer->st_arr.saved_traces_index + 1) & (SAVED_TRACES_NUM - 1);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 7+ messages in thread* Re: [PATCH] net/mlx5: fix a -Wstringop-truncation warning
2019-08-23 19:56 [PATCH] net/mlx5: fix a -Wstringop-truncation warning Qian Cai
@ 2019-08-23 22:18 ` David Miller
2019-08-26 20:18 ` Saeed Mahameed
2019-08-26 21:11 ` Saeed Mahameed
2019-08-27 21:51 ` Saeed Mahameed
2 siblings, 1 reply; 7+ messages in thread
From: David Miller @ 2019-08-23 22:18 UTC (permalink / raw)
To: cai
Cc: saeedm, leon, moshe, ferasda, eranbe, netdev, linux-rdma, linux-kernel
Saeed, I assume I'll get this from you.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] net/mlx5: fix a -Wstringop-truncation warning
2019-08-23 22:18 ` David Miller
@ 2019-08-26 20:18 ` Saeed Mahameed
0 siblings, 0 replies; 7+ messages in thread
From: Saeed Mahameed @ 2019-08-26 20:18 UTC (permalink / raw)
To: cai, davem
Cc: Eran Ben Elisha, linux-kernel, linux-rdma, netdev, Feras Daoud,
leon, Moshe Shemesh
On Fri, 2019-08-23 at 15:18 -0700, David Miller wrote:
> Saeed, I assume I'll get this from you.
Yes, i will handle it.
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] net/mlx5: fix a -Wstringop-truncation warning
2019-08-23 19:56 [PATCH] net/mlx5: fix a -Wstringop-truncation warning Qian Cai
2019-08-23 22:18 ` David Miller
@ 2019-08-26 21:11 ` Saeed Mahameed
2019-08-27 20:12 ` Qian Cai
2019-08-27 21:51 ` Saeed Mahameed
2 siblings, 1 reply; 7+ messages in thread
From: Saeed Mahameed @ 2019-08-26 21:11 UTC (permalink / raw)
To: cai
Cc: linux-rdma, davem, Moshe Shemesh, Feras Daoud, linux-kernel,
Eran Ben Elisha, netdev, leon
On Fri, 2019-08-23 at 15:56 -0400, Qian Cai wrote:
> In file included from ./arch/powerpc/include/asm/paca.h:15,
> from ./arch/powerpc/include/asm/current.h:13,
> from ./include/linux/thread_info.h:21,
> from ./include/asm-generic/preempt.h:5,
> from
> ./arch/powerpc/include/generated/asm/preempt.h:1,
> from ./include/linux/preempt.h:78,
> from ./include/linux/spinlock.h:51,
> from ./include/linux/wait.h:9,
> from ./include/linux/completion.h:12,
> from ./include/linux/mlx5/driver.h:37,
> from
> drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h:6,
> from
> drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:33:
> In function 'strncpy',
> inlined from 'mlx5_fw_tracer_save_trace' at
> drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:549:2,
> inlined from 'mlx5_tracer_print_trace' at
> drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:574:2:
> ./include/linux/string.h:305:9: warning: '__builtin_strncpy' output
> may
> be truncated copying 256 bytes from a string of length 511
> [-Wstringop-truncation]
> return __builtin_strncpy(p, q, size);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Fix it by using the new strscpy_pad() since the commit 458a3bf82df4
> ("lib/string: Add strscpy_pad() function") which will always
> NUL-terminate the string, and avoid possibly leak data through the
> ring
> buffer where non-admin account might enable these events through
> perf.
>
> Fixes: fd1483fe1f9f ("net/mlx5: Add support for FW reporter dump")
> Signed-off-by: Qian Cai <cai@lca.pw>
Hi Qian and thanks for your patch,
We already have a patch that handles this issue, please check it out:
https://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git/commit/?h=net-next-mlx5
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH] net/mlx5: fix a -Wstringop-truncation warning
2019-08-26 21:11 ` Saeed Mahameed
@ 2019-08-27 20:12 ` Qian Cai
2019-08-27 21:46 ` Saeed Mahameed
0 siblings, 1 reply; 7+ messages in thread
From: Qian Cai @ 2019-08-27 20:12 UTC (permalink / raw)
To: Saeed Mahameed
Cc: linux-rdma, davem, Moshe Shemesh, Feras Daoud, linux-kernel,
Eran Ben Elisha, netdev, leon
On Mon, 2019-08-26 at 21:11 +0000, Saeed Mahameed wrote:
> On Fri, 2019-08-23 at 15:56 -0400, Qian Cai wrote:
> > In file included from ./arch/powerpc/include/asm/paca.h:15,
> > from ./arch/powerpc/include/asm/current.h:13,
> > from ./include/linux/thread_info.h:21,
> > from ./include/asm-generic/preempt.h:5,
> > from
> > ./arch/powerpc/include/generated/asm/preempt.h:1,
> > from ./include/linux/preempt.h:78,
> > from ./include/linux/spinlock.h:51,
> > from ./include/linux/wait.h:9,
> > from ./include/linux/completion.h:12,
> > from ./include/linux/mlx5/driver.h:37,
> > from
> > drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h:6,
> > from
> > drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:33:
> > In function 'strncpy',
> > inlined from 'mlx5_fw_tracer_save_trace' at
> > drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:549:2,
> > inlined from 'mlx5_tracer_print_trace' at
> > drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:574:2:
> > ./include/linux/string.h:305:9: warning: '__builtin_strncpy' output
> > may
> > be truncated copying 256 bytes from a string of length 511
> > [-Wstringop-truncation]
> > return __builtin_strncpy(p, q, size);
> > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> >
> > Fix it by using the new strscpy_pad() since the commit 458a3bf82df4
> > ("lib/string: Add strscpy_pad() function") which will always
> > NUL-terminate the string, and avoid possibly leak data through the
> > ring
> > buffer where non-admin account might enable these events through
> > perf.
> >
> > Fixes: fd1483fe1f9f ("net/mlx5: Add support for FW reporter dump")
> > Signed-off-by: Qian Cai <cai@lca.pw>
>
>
> Hi Qian and thanks for your patch,
>
> We already have a patch that handles this issue, please check it out:
> https://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git/commit/?h=net-
> next-mlx5
>
That commit will make "struct mlx5_fw_tracer" too large and trigger a warning in
__alloc_pages_nodemask(),
/*
* There are several places where we assume that the order value is sane
* so bail out early if the request is out of bound.
*/
if (unlikely(order >= MAX_ORDER)) {
WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));
return NULL;
}
[ 98.339576][ T914] WARNING: CPU: 0 PID: 914 at mm/page_alloc.c:4705
__alloc_pages_nodemask+0x441/0x1bb0
[ 98.349174][ T914] Modules linked in: smartpqi(+) scsi_transport_sas tg3
mlx5_core(+) libphy firmware_class dm_mirror dm_region_hash dm_log dm_mod
efivarfs
[ 98.363495][ T914] CPU: 0 PID: 914 Comm: kworker/0:2 Not tainted 5.3.0-rc6-
next-20190827+ #14
[ 98.372243][ T914] Hardware name: HPE ProLiant DL385 Gen10/ProLiant DL385
Gen10, BIOS A40 07/10/2019
[ 98.381627][ T914] Workqueue: events work_for_cpu_fn
[ 98.386720][ T914] RIP: 0010:__alloc_pages_nodemask+0x441/0x1bb0
[ 98.392917][ T914] Code: 17 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d
c3 89 85 3c fe ff ff bb 01 00 00 00 e9 96 fd ff ff 81 e7 00 20 00 00 75 02 <0f>
0b 48 c7 85 50 fe ff ff 00 00 00 00 eb 82 31 d2 be 36 12 00 00
[ 98.412740][ T914] RSP: 0018:ffff88853418f948 EFLAGS: 00010246
[ 98.418704][ T914] RAX: 0000000000000000 RBX: ffffffff9571a860 RCX:
1ffff110a6831f3e
[ 98.426652][ T914] RDX: 0000000000000000 RSI: 000000000000000b RDI:
0000000000000000
[ 98.434661][ T914] RBP: ffff88853418fb58 R08: ffffed1108808465 R09:
ffffed1108808465
[ 98.442613][ T914] R10: ffffed1108808464 R11: ffff888844042323 R12:
0000000000000000
[ 98.450548][ T914] R13: 000000000000000b R14: 0000000000000000 R15:
0000000000000001
[ 98.458434][ T914] FS: 0000000000000000(0000) GS:ffff888844000000(0000)
knlGS:0000000000000000
[ 98.467350][ T914] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 98.473911][ T914] CR2: 0000555c64680148 CR3: 0000000550412000 CR4:
00000000003406b0
[ 98.481838][ T914] Call Trace:
[ 98.485011][ T914] ? find_next_bit+0x2c/0xa0
[ 98.489490][ T914] ? __kasan_check_write+0x14/0x20
[ 98.494506][ T914] ? graph_lock+0xb8/0x120
[ 98.498811][ T914] ? __free_zapped_classes+0x740/0x740
[ 98.504239][ T914] ? gfp_pfmemalloc_allowed+0xc0/0xc0
[ 98.509504][ T914] ? __kasan_check_read+0x11/0x20
[ 98.514443][ T914] ? register_lock_class+0x5ef/0x960
[ 98.519624][ T914] ? rcu_read_lock_sched_held+0xac/0xe0
[ 98.525152][ T914] ? rcu_read_lock_any_held.part.5+0x20/0x20
[ 98.531130][ T914] ? find_next_bit+0x2c/0xa0
[ 98.535610][ T914] alloc_pages_current+0x9c/0x110
[ 98.540638][ T914] kmalloc_order+0x22/0x70
[ 98.544943][ T914] kmalloc_order_trace+0x23/0x100
[ 98.550072][ T914] mlx5_fw_tracer_create+0x51/0x870 [mlx5_core]
[ 98.556213][ T914] ? __mutex_init+0x94/0xa0
[ 98.560744][ T914] ? mlx5_init_rl_table+0x144/0x210 [mlx5_core]
[ 98.566929][ T914] mlx5_load_one+0x199/0x980 [mlx5_core]
[ 98.572637][ T914] init_one+0x494/0x760 [mlx5_core]
[ 98.577771][ T914] ? mlx5_pci_resume+0xd0/0xd0 [mlx5_core]
[ 98.583574][ T914] local_pci_probe+0x7a/0xc0
[ 98.588054][ T914] ? pci_dma_configure+0xa0/0xa0
[ 98.592938][ T914] work_for_cpu_fn+0x2e/0x50
[ 98.597416][ T914] process_one_work+0x53b/0xa70
[ 98.602220][ T914] ? pwq_dec_nr_in_flight+0x170/0x170
[ 98.607485][ T914] ? move_linked_works+0x113/0x150
[ 98.612497][ T914] worker_thread+0x363/0x5b0
[ 98.616976][ T914] kthread+0x1df/0x200
[ 98.620932][ T914] ? process_one_work+0xa70/0xa70
[ 98.625847][ T914] ? kthread_park+0xd0/0xd0
[ 98.630240][ T914] ret_from_fork+0x22/0x40
^ permalink raw reply [flat|nested] 7+ messages in thread* Re: [PATCH] net/mlx5: fix a -Wstringop-truncation warning
2019-08-27 20:12 ` Qian Cai
@ 2019-08-27 21:46 ` Saeed Mahameed
0 siblings, 0 replies; 7+ messages in thread
From: Saeed Mahameed @ 2019-08-27 21:46 UTC (permalink / raw)
To: cai
Cc: linux-rdma, davem, Moshe Shemesh, Feras Daoud, linux-kernel,
Eran Ben Elisha, netdev, leon
On Tue, 2019-08-27 at 16:12 -0400, Qian Cai wrote:
> On Mon, 2019-08-26 at 21:11 +0000, Saeed Mahameed wrote:
> > On Fri, 2019-08-23 at 15:56 -0400, Qian Cai wrote:
> > > In file included from ./arch/powerpc/include/asm/paca.h:15,
> > > from ./arch/powerpc/include/asm/current.h:13,
> > > from ./include/linux/thread_info.h:21,
> > > from ./include/asm-generic/preempt.h:5,
> > > from
> > > ./arch/powerpc/include/generated/asm/preempt.h:1,
> > > from ./include/linux/preempt.h:78,
> > > from ./include/linux/spinlock.h:51,
> > > from ./include/linux/wait.h:9,
> > > from ./include/linux/completion.h:12,
> > > from ./include/linux/mlx5/driver.h:37,
> > > from
> > > drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h:6,
> > > from
> > > drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:33:
> > > In function 'strncpy',
> > > inlined from 'mlx5_fw_tracer_save_trace' at
> > > drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:549:2,
> > > inlined from 'mlx5_tracer_print_trace' at
> > > drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:574:2:
> > > ./include/linux/string.h:305:9: warning: '__builtin_strncpy'
> > > output
> > > may
> > > be truncated copying 256 bytes from a string of length 511
> > > [-Wstringop-truncation]
> > > return __builtin_strncpy(p, q, size);
> > > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > >
> > > Fix it by using the new strscpy_pad() since the commit
> > > 458a3bf82df4
> > > ("lib/string: Add strscpy_pad() function") which will always
> > > NUL-terminate the string, and avoid possibly leak data through
> > > the
> > > ring
> > > buffer where non-admin account might enable these events through
> > > perf.
> > >
> > > Fixes: fd1483fe1f9f ("net/mlx5: Add support for FW reporter
> > > dump")
> > > Signed-off-by: Qian Cai <cai@lca.pw>
> >
> > Hi Qian and thanks for your patch,
> >
> > We already have a patch that handles this issue, please check it
> > out:
> > https://git.kernel.org/pub/scm/linux/kernel/git/saeed/linux.git/commit/?h=net-
> > next-mlx5
> >
>
> That commit will make "struct mlx5_fw_tracer" too large and trigger a
> warning in
> __alloc_pages_nodemask(),
>
I see! thanks for the input, the patch is still under review and not
yet passed to regression queue.
I will take your patch.. and will fix our patch on top of yours.
> /*
> * There are several places where we assume that the order
> value is sane
> * so bail out early if the request is out of bound.
> */
> if (unlikely(order >= MAX_ORDER)) {
> WARN_ON_ONCE(!(gfp_mask & __GFP_NOWARN));
> return NULL;
> }
>
> [ 98.339576][ T914] WARNING: CPU: 0 PID: 914 at
> mm/page_alloc.c:4705
> __alloc_pages_nodemask+0x441/0x1bb0
> [ 98.349174][ T914] Modules linked in: smartpqi(+)
> scsi_transport_sas tg3
> mlx5_core(+) libphy firmware_class dm_mirror dm_region_hash dm_log
> dm_mod
> efivarfs
> [ 98.363495][ T914] CPU: 0 PID: 914 Comm: kworker/0:2 Not tainted
> 5.3.0-rc6-
> next-20190827+ #14
> [ 98.372243][ T914] Hardware name: HPE ProLiant DL385
> Gen10/ProLiant DL385
> Gen10, BIOS A40 07/10/2019
> [ 98.381627][ T914] Workqueue: events work_for_cpu_fn
> [ 98.386720][ T914] RIP: 0010:__alloc_pages_nodemask+0x441/0x1bb0
> [ 98.392917][ T914] Code: 17 00 00 48 8d 65 d8 5b 41 5c 41 5d 41
> 5e 41 5f 5d
> c3 89 85 3c fe ff ff bb 01 00 00 00 e9 96 fd ff ff 81 e7 00 20 00 00
> 75 02 <0f>
> 0b 48 c7 85 50 fe ff ff 00 00 00 00 eb 82 31 d2 be 36 12 00 00
> [ 98.412740][ T914] RSP: 0018:ffff88853418f948 EFLAGS: 00010246
> [ 98.418704][ T914] RAX: 0000000000000000 RBX: ffffffff9571a860
> RCX:
> 1ffff110a6831f3e
> [ 98.426652][ T914] RDX: 0000000000000000 RSI: 000000000000000b
> RDI:
> 0000000000000000
> [ 98.434661][ T914] RBP: ffff88853418fb58 R08: ffffed1108808465
> R09:
> ffffed1108808465
> [ 98.442613][ T914] R10: ffffed1108808464 R11: ffff888844042323
> R12:
> 0000000000000000
> [ 98.450548][ T914] R13: 000000000000000b R14: 0000000000000000
> R15:
> 0000000000000001
> [ 98.458434][ T914] FS: 0000000000000000(0000)
> GS:ffff888844000000(0000)
> knlGS:0000000000000000
> [ 98.467350][ T914] CS: 0010 DS: 0000 ES: 0000 CR0:
> 0000000080050033
> [ 98.473911][ T914] CR2: 0000555c64680148 CR3: 0000000550412000
> CR4:
> 00000000003406b0
> [ 98.481838][ T914] Call Trace:
> [ 98.485011][ T914] ? find_next_bit+0x2c/0xa0
> [ 98.489490][ T914] ? __kasan_check_write+0x14/0x20
> [ 98.494506][ T914] ? graph_lock+0xb8/0x120
> [ 98.498811][ T914] ? __free_zapped_classes+0x740/0x740
> [ 98.504239][ T914] ? gfp_pfmemalloc_allowed+0xc0/0xc0
> [ 98.509504][ T914] ? __kasan_check_read+0x11/0x20
> [ 98.514443][ T914] ? register_lock_class+0x5ef/0x960
> [ 98.519624][ T914] ? rcu_read_lock_sched_held+0xac/0xe0
> [ 98.525152][ T914] ? rcu_read_lock_any_held.part.5+0x20/0x20
> [ 98.531130][ T914] ? find_next_bit+0x2c/0xa0
> [ 98.535610][ T914] alloc_pages_current+0x9c/0x110
> [ 98.540638][ T914] kmalloc_order+0x22/0x70
> [ 98.544943][ T914] kmalloc_order_trace+0x23/0x100
> [ 98.550072][ T914] mlx5_fw_tracer_create+0x51/0x870 [mlx5_core]
> [ 98.556213][ T914] ? __mutex_init+0x94/0xa0
> [ 98.560744][ T914] ? mlx5_init_rl_table+0x144/0x210 [mlx5_core]
> [ 98.566929][ T914] mlx5_load_one+0x199/0x980 [mlx5_core]
> [ 98.572637][ T914] init_one+0x494/0x760 [mlx5_core]
> [ 98.577771][ T914] ? mlx5_pci_resume+0xd0/0xd0 [mlx5_core]
> [ 98.583574][ T914] local_pci_probe+0x7a/0xc0
> [ 98.588054][ T914] ? pci_dma_configure+0xa0/0xa0
> [ 98.592938][ T914] work_for_cpu_fn+0x2e/0x50
> [ 98.597416][ T914] process_one_work+0x53b/0xa70
> [ 98.602220][ T914] ? pwq_dec_nr_in_flight+0x170/0x170
> [ 98.607485][ T914] ? move_linked_works+0x113/0x150
> [ 98.612497][ T914] worker_thread+0x363/0x5b0
> [ 98.616976][ T914] kthread+0x1df/0x200
> [ 98.620932][ T914] ? process_one_work+0xa70/0xa70
> [ 98.625847][ T914] ? kthread_park+0xd0/0xd0
> [ 98.630240][ T914] ret_from_fork+0x22/0x40
^ permalink raw reply [flat|nested] 7+ messages in thread
* Re: [PATCH] net/mlx5: fix a -Wstringop-truncation warning
2019-08-23 19:56 [PATCH] net/mlx5: fix a -Wstringop-truncation warning Qian Cai
2019-08-23 22:18 ` David Miller
2019-08-26 21:11 ` Saeed Mahameed
@ 2019-08-27 21:51 ` Saeed Mahameed
2 siblings, 0 replies; 7+ messages in thread
From: Saeed Mahameed @ 2019-08-27 21:51 UTC (permalink / raw)
To: cai
Cc: linux-rdma, davem, Moshe Shemesh, Feras Daoud, linux-kernel,
Eran Ben Elisha, netdev, leon
On Fri, 2019-08-23 at 15:56 -0400, Qian Cai wrote:
> In file included from ./arch/powerpc/include/asm/paca.h:15,
> from ./arch/powerpc/include/asm/current.h:13,
> from ./include/linux/thread_info.h:21,
> from ./include/asm-generic/preempt.h:5,
> from
> ./arch/powerpc/include/generated/asm/preempt.h:1,
> from ./include/linux/preempt.h:78,
> from ./include/linux/spinlock.h:51,
> from ./include/linux/wait.h:9,
> from ./include/linux/completion.h:12,
> from ./include/linux/mlx5/driver.h:37,
> from
> drivers/net/ethernet/mellanox/mlx5/core/lib/eq.h:6,
> from
> drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:33:
> In function 'strncpy',
> inlined from 'mlx5_fw_tracer_save_trace' at
> drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:549:2,
> inlined from 'mlx5_tracer_print_trace' at
> drivers/net/ethernet/mellanox/mlx5/core/diag/fw_tracer.c:574:2:
> ./include/linux/string.h:305:9: warning: '__builtin_strncpy' output
> may
> be truncated copying 256 bytes from a string of length 511
> [-Wstringop-truncation]
> return __builtin_strncpy(p, q, size);
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Fix it by using the new strscpy_pad() since the commit 458a3bf82df4
> ("lib/string: Add strscpy_pad() function") which will always
> NUL-terminate the string, and avoid possibly leak data through the
> ring
> buffer where non-admin account might enable these events through
> perf.
>
> Fixes: fd1483fe1f9f ("net/mlx5: Add support for FW reporter dump")
> Signed-off-by: Qian Cai <cai@lca.pw>
>
Applied to mlx5-next, Thanks !
^ permalink raw reply [flat|nested] 7+ messages in thread
end of thread, other threads:[~2019-08-27 21:52 UTC | newest]
Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-08-23 19:56 [PATCH] net/mlx5: fix a -Wstringop-truncation warning Qian Cai
2019-08-23 22:18 ` David Miller
2019-08-26 20:18 ` Saeed Mahameed
2019-08-26 21:11 ` Saeed Mahameed
2019-08-27 20:12 ` Qian Cai
2019-08-27 21:46 ` Saeed Mahameed
2019-08-27 21:51 ` Saeed Mahameed
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