Hi all,
We found a data race involving the *card_requested[card]* variable here https://elixir.bootlin.com/linux/v5.18-rc5/source/sound/core/seq/seq_clientmgr.c#L147, 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.
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})