* Re: data-race in snd_seq_client_use_ptr / snd_seq_client_use_ptr [not found] <CAEHB24_ay6YzARpA1zgCsE7=H9CSJJzux618E=Ka4h0YdKn=qA@mail.gmail.com> @ 2022-08-20 7:05 ` Takashi Iwai 2022-08-22 20:55 ` Gabriel Ryan 0 siblings, 1 reply; 2+ messages in thread From: Takashi Iwai @ 2022-08-20 7:05 UTC (permalink / raw) To: abhishek.shah; +Cc: alsa-devel, perex, tiwai, linux-kernel, Gabriel Ryan 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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56bc736f49217c88859aa63ea1384f3b9dbdc8b30262d0efffddec03fc4241740d23917ef92fc7de3ae3665ff3c9397bf4fcde524cc403f28806317a0059ae93d82e3fb5cc49596c785f46427317d2f3c9d285d239383dfbea914ad84213e1e0121533dc696bee622d0f93ed8eef2e1eb408364adfca90eef0236a85c8d5c4a55dd42793d18b9eaceb8727e1a5bf01b1156ca04452485c6e4a9d40185664eec10c5fecc9dfd48536d5aa70c29eeb43c7a1a2ed73ff66a2604ed959a811e2268980958b2ab1682fb2a5966ab85163a34a9efc27d349625970f1", > 0x2000, &(0x7f00000048c0)={0x0, &(0x7f00000020c0)={0x18}, 0x0, 0x0, 0x0, 0x0, > 0x0, &(0x7f0000002280)={0x18, 0x0, 0x0, {0x9}}, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, > 0x0, 0x0}) > > ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: data-race in snd_seq_client_use_ptr / snd_seq_client_use_ptr 2022-08-20 7:05 ` data-race in snd_seq_client_use_ptr / snd_seq_client_use_ptr Takashi Iwai @ 2022-08-22 20:55 ` Gabriel Ryan 0 siblings, 0 replies; 2+ messages in thread From: Gabriel Ryan @ 2022-08-22 20:55 UTC (permalink / raw) To: Takashi Iwai; +Cc: abhishek.shah, alsa-devel, perex, tiwai, linux-kernel 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@suse.de> 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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bccc99d3c5fb1be2d5a2f5814688db811d8af8fc273a8e47620e23934c1ea642cf776fa276ad857cb023988ef39b237b00c72b85d86fed11fbdeaf31ced509c265822b560e7f0793eb5b53c5c7be3d855d146e2997f9974677dfa7a49f3c685bf24e8dcae56b3352c1038d8c7392af62ed22c5054157812ed4b14e6c7b9e4f8cba3fd99543ea467019ad74e2025b2b1c4195581ef91a88b999254ac748e748c4a50480a6cd3f5fd7d8bc919bdce7bf51925dc187df60af567ef232cb59d5583d604a19928c2699905446f2758fc7b640fbd0a2b9494b2b13cea88da31c5b643663f592e9b9ba580c16a2371dfdb223c7c803389b331e2412862c26cd9254e1db521f0851d9fe1d9d3cec7718fa785e227ffeda95e47944bd76ad718a1e27fdc7a51bea6f128f593cff860e82a9b474e0956830a35340616f4e8fbb10c94698b4310ee49b9398d0501af47982a7add81fef360000860926d09236532751a54107636120454e9b952ad891e645c74606a9869e5b6a4e20178decbf842d3aba603be3f4ff149b23776954b4b9898755f05b91fcee1574dc66de42547cee0b4f23c320224a737776bc4f04bcb996bef301b692d8b64d1d11d54dc5ef5760fda3e16571cac787d1f0e6de4a88b7f6ef8886734a451c4c971545d9ffe39d80eeaf9f1c77ab04364ad3281a4d41a250e410e138fc759 > 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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}) > > > > ^ permalink raw reply [flat|nested] 2+ messages in thread
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[not found] <CAEHB24_ay6YzARpA1zgCsE7=H9CSJJzux618E=Ka4h0YdKn=qA@mail.gmail.com>
2022-08-20 7:05 ` data-race in snd_seq_client_use_ptr / snd_seq_client_use_ptr Takashi Iwai
2022-08-22 20:55 ` Gabriel Ryan
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