data-race in snd_seq_client_use_ptr / snd_seq_client_use_ptr

[Takashi Iwai]

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})
> 
>