Ok, makes sense, thanks for taking the time to look at our report.
Best,
Gabe
On Sat, Aug 20, 2022 at 3:05 AM Takashi Iwai <tiwai@xxxxxxx> wrote:
>
> On Fri, 19 Aug 2022 19:00:00 +0200,
> Abhishek Shah wrote:
> >
> >
> > Hi all,
> >
> > We found a data race involving the card_requested[card] variableáhere, which
> > can causeásnd_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 whatáyou think.á
>
> 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:
> > ásnd_seq_client_use_ptr+0x254/0x610 sound/core/seq/seq_clientmgr.c:146
> > ásnd_seq_info_clients_read+0xd8/0x480 sound/core/seq/seq_clientmgr.c:2475
> > ásnd_info_seq_show+0x81/0xa0 sound/core/info.c:361
> > áseq_read_iter+0x2d2/0x8e0 fs/seq_file.c:230
> > áseq_read+0x1c9/0x210 fs/seq_file.c:162
> > ápde_read fs/proc/inode.c:311 [inline]
> > áproc_reg_read+0x123/0x1b0 fs/proc/inode.c:323
> > ávfs_read+0x1b5/0x6e0 fs/read_write.c:480
> > áksys_read+0xde/0x190 fs/read_write.c:620
> > á__do_sys_read fs/read_write.c:630 [inline]
> > á__se_sys_read fs/read_write.c:628 [inline]
> > á__x64_sys_read+0x43/0x50 fs/read_write.c:628
> > ádo_syscall_x64 arch/x86/entry/common.c:50 [inline]
> > ádo_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
> > áentry_SYSCALL_64_after_hwframe+0x44/0xae
> >
> > read to 0xffffffff88382191 of 1 bytes by task 6542 on cpu 1:
> > ásnd_seq_client_use_ptr+0x189/0x610 sound/core/seq/seq_clientmgr.c:145
> > ásnd_seq_info_clients_read+0xd8/0x480 sound/core/seq/seq_clientmgr.c:2475
> > ásnd_info_seq_show+0x81/0xa0 sound/core/info.c:361
> > áseq_read_iter+0x2d2/0x8e0 fs/seq_file.c:230
> > áseq_read+0x1c9/0x210 fs/seq_file.c:162
> > ápde_read fs/proc/inode.c:311 [inline]
> > áproc_reg_read+0x123/0x1b0 fs/proc/inode.c:323
> > ávfs_read+0x1b5/0x6e0 fs/read_write.c:480
> > áksys_read+0xde/0x190 fs/read_write.c:620
> > á__do_sys_read fs/read_write.c:630 [inline]
> > á__se_sys_read fs/read_write.c:628 [inline]
> > á__x64_sys_read+0x43/0x50 fs/read_write.c:628
> > ádo_syscall_x64 arch/x86/entry/common.c:50 [inline]
> > ádo_syscall_64+0x3d/0x90 arch/x86/entry/common.c:80
> > áentry_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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> 30942962e688c5fad693a6e88d21d61dfb51d8e84ffd090a5f7c31ef8f77e1a3e7ee77f71531e3d3e190bc8bbfd5e7b7792a0e361baee79c9db165033a83fda2f1972b75ad31e299ee69af7bb1c50870be803b17f6adc284bd18d10444b9af2a44be791515f2f229d549b8b85d0e05ac418c852336b917cf6b5cfde4f0521a19d3b888f72b71c5a5b11f96853f76da5cd954ecfde9b37f4f44f3187034c57790be1e696390b9ed4db6d660900b1bdf9f76447037ae56a1ec6d78560afa27aed79ef6b592db1056d97104d5cf8f16e5dc9e8c45915486c042ad29ed2c8084fb94ee9ebf18792b83220dc38936c3d2e09a1ef541fc7a440b6a09674a55860fd9467efe1580a6601720b36f128612b20837c6f4cc44a43deb771a001885bb17467d7ec350ddc648f3c13b579213b91d35c02481280efdee61cae175923fe9e5f218d61b146b71d9d7d60dbf740ee3f53fe46e7952cbca6595e56dfa02aecd623b6be5719f87de725d92df32838f1b61b4e7bae65b683619ed8286e70382f801c067548d6f83c701c92fb84d0e0256114882af2c8fe2b67e456f7c77637560a610693b6302d0f5e135c96036966aa6868b77d10e2272887491fce4ce8ec1e0fadc326707fa1a404384baec7b1ba0524ee1ee873662c1a530ea396fc5cf5fa3c8b117829cb144577bdce0cca193a180b0b2ba69ca8
> 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
> 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
> 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
> 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
> 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
> 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
> 56bc736f49217c88859aa63ea1384f3b9dbdc8b30262d0efffddec03fc4241740d23917ef92fc7de3ae3665ff3c9397bf4fcde524cc403f28806317a0059ae93d82e3fb5cc49596c785f46427317d2f3c9d285d239383dfbea914ad84213e1e0121533dc696bee622d0f93ed8eef2e1eb408364adfca90eef0236a85c8d5c4a55dd42793d18b9eaceb8727e1a5bf01b1156ca04452485c6e4a9d40185664eec10c5fecc9dfd48536d5aa70c29eeb43c7a1a2ed73ff66a2604ed959a811e2268980958b2ab1682fb2a5966ab85163a34a9efc27d349625970f1",
> > 0x2000, &(0x7f00000048c0)={0x0, &(0x7f00000020c0)={0x18}, 0x0, 0x0, 0x0, 0x0,
> > 0x0, &(0x7f0000002280)={0x18, 0x0, 0x0, {0x9}}, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0,
> > 0x0, 0x0})
> >
> >
