CVE-2024-26750
Vulnerability from cvelistv5
Published
2024-04-04 08:20
Modified
2024-12-19 08:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: af_unix: Drop oob_skb ref before purging queue in GC. syzbot reported another task hung in __unix_gc(). [0] The current while loop assumes that all of the left candidates have oob_skb and calling kfree_skb(oob_skb) releases the remaining candidates. However, I missed a case that oob_skb has self-referencing fd and another fd and the latter sk is placed before the former in the candidate list. Then, the while loop never proceeds, resulting the task hung. __unix_gc() has the same loop just before purging the collected skb, so we can call kfree_skb(oob_skb) there and let __skb_queue_purge() release all inflight sockets. [0]: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2784 Comm: kworker/u4:8 Not tainted 6.8.0-rc4-syzkaller-01028-g71b605d32017 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Workqueue: events_unbound __unix_gc RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200 Code: 89 fb e8 23 00 00 00 48 8b 3d 84 f5 1a 0c 48 89 de 5b e9 43 26 57 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <f3> 0f 1e fa 48 8b 04 24 65 48 8b 0d 90 52 70 7e 65 8b 15 91 52 70 RSP: 0018:ffffc9000a17fa78 EFLAGS: 00000287 RAX: ffffffff8a0a6108 RBX: ffff88802b6c2640 RCX: ffff88802c0b3b80 RDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000 RBP: ffffc9000a17fbf0 R08: ffffffff89383f1d R09: 1ffff1100ee5ff84 R10: dffffc0000000000 R11: ffffed100ee5ff85 R12: 1ffff110056d84ee R13: ffffc9000a17fae0 R14: 0000000000000000 R15: ffffffff8f47b840 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef5687ff8 CR3: 0000000029b34000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> __unix_gc+0xe69/0xf40 net/unix/garbage.c:343 process_one_work kernel/workqueue.c:2633 [inline] process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 </TASK>
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43ba9e331559a30000c862eea313248707afa787
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6c480d0f131862645d172ca9e25dc152b1a5c3a6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aa82ac51d63328714645c827775d64dbfd9941f3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c4c795b21dd23d9514ae1c6646c3fb2c78b5be60
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e9eac260369d0cf57ea53df95427125725507a0d
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/43ba9e331559a30000c862eea313248707afa787
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/6c480d0f131862645d172ca9e25dc152b1a5c3a6
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/aa82ac51d63328714645c827775d64dbfd9941f3
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c4c795b21dd23d9514ae1c6646c3fb2c78b5be60
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e9eac260369d0cf57ea53df95427125725507a0d
Impacted products
Vendor Product Version
Linux Linux Version: 5.15.149   ≤
Show details on NVD website

To clipboard 

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Then, the while loop never proceeds, resulting\\nthe task hung.\\n\\n__unix_gc() has the same loop just before purging the collected skb,\\nso we can call kfree_skb(oob_skb) there and let __skb_queue_purge()\\nrelease all inflight sockets.\\n\\n[0]:\\nSending NMI from CPU 0 to CPUs 1:\\nNMI backtrace for cpu 1\\nCPU: 1 PID: 2784 Comm: kworker/u4:8 Not tainted 6.8.0-rc4-syzkaller-01028-g71b605d32017 #0\\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024\\nWorkqueue: events_unbound __unix_gc\\nRIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200\\nCode: 89 fb e8 23 00 00 00 48 8b 3d 84 f5 1a 0c 48 89 de 5b e9 43 26 57 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 \u003cf3\u003e 0f 1e fa 48 8b 04 24 65 48 8b 0d 90 52 70 7e 65 8b 15 91 52 70\\nRSP: 0018:ffffc9000a17fa78 EFLAGS: 00000287\\nRAX: ffffffff8a0a6108 RBX: ffff88802b6c2640 RCX: ffff88802c0b3b80\\nRDX: 0000000000000000 RSI: 0000000000000002 RDI: 0000000000000000\\nRBP: ffffc9000a17fbf0 R08: ffffffff89383f1d R09: 1ffff1100ee5ff84\\nR10: dffffc0000000000 R11: ffffed100ee5ff85 R12: 1ffff110056d84ee\\nR13: ffffc9000a17fae0 R14: 0000000000000000 R15: ffffffff8f47b840\\nFS:  0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000\\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\nCR2: 00007ffef5687ff8 CR3: 0000000029b34000 CR4: 00000000003506f0\\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\\nCall Trace:\\n \u003cNMI\u003e\\n \u003c/NMI\u003e\\n \u003cTASK\u003e\\n __unix_gc+0xe69/0xf40 net/unix/garbage.c:343\\n process_one_work kernel/workqueue.c:2633 [inline]\\n process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706\\n worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787\\n kthread+0x2ef/0x390 kernel/kthread.c:388\\n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147\\n ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242\\n \u003c/TASK\u003e\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: af_unix: elimine la referencia oob_skb antes de purgar la cola en GC. syzbot inform\u00f3 que otra tarea se colg\u00f3 en __unix_gc(). [0] El bucle while actual supone que todos los candidatos restantes tienen oob_skb y llamar a kfree_skb(oob_skb) libera los candidatos restantes. Sin embargo, me perd\u00ed un caso en el que oob_skb tiene fd autorreferenciado y otro fd y el \u00faltimo sk se coloca antes que el primero en la lista de candidatos. Luego, el ciclo while nunca contin\u00faa, lo que provoca que la tarea se bloquee. __unix_gc() tiene el mismo bucle justo antes de purgar el skb recopilado, por lo que podemos llamar a kfree_skb(oob_skb) all\u00ed y dejar que __skb_queue_purge() libere todos los sockets en vuelo. [0]: Env\u00edo de NMI desde la CPU 0 a las CPU 1: seguimiento de NMI para la CPU 1 CPU: 1 PID: 2784 Comm: kworker/u4:8 Not tainted 6.8.0-rc4-syzkaller-01028-g71b605d32017 #0 Nombre de hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 25/01/2024 Cola de trabajo: events_unbound __unix_gc RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:200 C\u00f3digo: 89 fb e8 23 00 00 00 48 8b 3d 84 f5 1a 0c 48 89 de 5b e9 43 26 57 00 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90  0f 1e fa 48 8b 04 24 65 48 8b 0d 90 5 2 70 7e 65 8b 15 91 52 70 RSP: 0018:ffffc9000a17fa78 EFLAGS: 00000287 RAX: ffffffff8a0a6108 RBX: ffff88802b6c2640 RCX: ffff88802c0b3b80 RDX: 0000000000000000 RSI: 0 000000000000002 RDI: 0000000000000000 RBP: ffffc9000a17fbf0 R08: ffffffff89383f1d R09: 1ffff1100ee5ff84 R10: dffffc0000000000 R11: ffffed100ee5ff85 R12: 1ffff110056d84ee R13: ffffc9000a17fae0 R14: 0000000000000000 R15: ffffffff8f47b840 FS: 0000000000000000(0000) GS:ffff8880b9500000(0000) knlGS:00000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffef5687ff8 CR3: 0000000029b34000 CR4: 00000000003506f0 DR0: 00000000000000000 DR1: 00000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Seguimiento de llamadas:    __unix_gc+0xe69/0xf40 net/unix/garbage.c:343 proceso _one_work kernel/workqueue.c:2633 [en l\u00ednea] proceso_scheduled_works+ 0x913/0x1420 kernel/workqueue.c:2706 trabajador_thread+0xa5f/0x1000 kernel/workqueue.c:2787 kthread+0x2ef/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242 \"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/43ba9e331559a30000c862eea313248707afa787\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6c480d0f131862645d172ca9e25dc152b1a5c3a6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/aa82ac51d63328714645c827775d64dbfd9941f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c4c795b21dd23d9514ae1c6646c3fb2c78b5be60\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e9eac260369d0cf57ea53df95427125725507a0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43ba9e331559a30000c862eea313248707afa787\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/6c480d0f131862645d172ca9e25dc152b1a5c3a6\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/aa82ac51d63328714645c827775d64dbfd9941f3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/c4c795b21dd23d9514ae1c6646c3fb2c78b5be60\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/e9eac260369d0cf57ea53df95427125725507a0d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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