| Message ID | 1566590183-9898-1-git-send-email-cai@lca.pw (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | net/mlx5: fix a -Wstringop-truncation warning | expand |
Saeed, I assume I'll get this from you.
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.
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
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
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
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 !
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);
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(-)