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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