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Message-ID: <c1844fb0d81592dfc48f8291f2fdd2a25e1d2e7f.camel@mellanox.com>
Date: Tue, 27 Aug 2019 21:46:58 +0000
From: Saeed Mahameed <saeedm@...lanox.com>
To: "cai@....pw" <cai@....pw>
CC: "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"davem@...emloft.net" <davem@...emloft.net>,
Moshe Shemesh <moshe@...lanox.com>,
Feras Daoud <ferasda@...lanox.com>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Eran Ben Elisha <eranbe@...lanox.com>,
"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
"leon@...nel.org" <leon@...nel.org>
Subject: Re: [PATCH] net/mlx5: fix a -Wstringop-truncation warning
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@....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
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