Date:   Sat, 20 Aug 2022 09:05:56 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     abhishek.shah@...umbia.edu
Cc:     alsa-devel@...a-project.org, perex@...ex.cz, tiwai@...e.com,
        linux-kernel@...r.kernel.org, Gabriel Ryan <gabe@...columbia.edu>
Subject: Re: data-race in snd_seq_client_use_ptr / snd_seq_client_use_ptr

On Fri, 19 Aug 2022 19:00:00 +0200,
Abhishek Shah wrote:
> 
> 
> Hi all,
> 
> We found a data race involving the card_requested[card] variable here, which
> can cause snd_request_card to be called multiple times. We are not sure if
> this has security implications however, but we would still like to report it.
> Please let us know what you think. 

It's harmless.  The result would be another call of request_module(),
which might be just redundant but it doesn't influence on the behavior
or the safety.


thanks,

Takashi

> 
> Thanks!
> 
> ----------Report-----------
> write to 0xffffffff88382191 of 1 bytes by task 6541 on cpu 0:
>  snd_seq_client_use_ptr+0x254/0x610 sound/core/seq/seq_clientmgr.c:146
>  snd_seq_info_clients_read+0xd8/0x480 sound/core/seq/seq_clientmgr.c:2475
>  snd_info_seq_show+0x81/0xa0 sound/core/info.c:361
>  seq_read_iter+0x2d2/0x8e0 fs/seq_file.c:230
>  seq_read+0x1c9/0x210 fs/seq_file.c:162
>  pde_read fs/proc/inode.c:311 [inline]
>  proc_reg_read+0x123/0x1b0 fs/proc/inode.c:323
>  vfs_read+0x1b5/0x6e0 fs/read_write.c:480
>  ksys_read+0xde/0x190 fs/read_write.c:620
>  __do_sys_read fs/read_write.c:630 [inline]
>  __se_sys_read fs/read_write.c:628 [inline]
>  __x64_sys_read+0x43/0x50 fs/read_write.c:628
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> read to 0xffffffff88382191 of 1 bytes by task 6542 on cpu 1:
>  snd_seq_client_use_ptr+0x189/0x610 sound/core/seq/seq_clientmgr.c:145
>  snd_seq_info_clients_read+0xd8/0x480 sound/core/seq/seq_clientmgr.c:2475
>  snd_info_seq_show+0x81/0xa0 sound/core/info.c:361
>  seq_read_iter+0x2d2/0x8e0 fs/seq_file.c:230
>  seq_read+0x1c9/0x210 fs/seq_file.c:162
>  pde_read fs/proc/inode.c:311 [inline]
>  proc_reg_read+0x123/0x1b0 fs/proc/inode.c:323
>  vfs_read+0x1b5/0x6e0 fs/read_write.c:480
>  ksys_read+0xde/0x190 fs/read_write.c:620
>  __do_sys_read fs/read_write.c:630 [inline]
>  __se_sys_read fs/read_write.c:628 [inline]
>  __x64_sys_read+0x43/0x50 fs/read_write.c:628
>  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
>  do_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
>  entry_SYSCALL_64_after_hwframe+0x44/0xae
> 
> Reported by Kernel Concurrency Sanitizer on:
> CPU: 1 PID: 6542 Comm: syz-executor2-n Not tainted 5.18.0-rc5+ #107
> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/
> 2014
> 
> Reproducing Inputs
> 
> Input CPU 0:
> r0 = openat$procfs(0xffffffffffffff9c, &(0x7f00000004c0)='/proc/asound/seq/
> clients\x00', 0x0, 0x0)
> read$ptp(r0, &(0x7f0000001280)=""/4096, 0x1000)
> 
> Input CPU 1:
> r0 = openat$procfs(0xffffff9c, &(0x7f0000000000)='/proc/asound/seq/clients\
> x00', 0x0, 0x0)
> syz_fuse_handle_req(r0, &(0x7f0000000040)=
> "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> 0x2000, &(0x7f00000048c0)={0x0, &(0x7f00000020c0)={0x18}, 0x0, 0x0, 0x0, 0x0,
> 0x0, &(0x7f0000002280)={0x18, 0x0, 0x0, {0x9}}, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> 0x0, 0x0})
> 
> 

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