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21 lines
4.3 KiB
Markdown
21 lines
4.3 KiB
Markdown
### [CVE-2024-50082](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50082)
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### Description
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In the Linux kernel, the following vulnerability has been resolved:blk-rq-qos: fix crash on rq_qos_wait vs. rq_qos_wake_function raceWe're seeing crashes from rq_qos_wake_function that look like this: BUG: unable to handle page fault for address: ffffafe180a40084 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 100000067 P4D 100000067 PUD 10027c067 PMD 10115d067 PTE 0 Oops: Oops: 0002 [#1] PREEMPT SMP PTI CPU: 17 UID: 0 PID: 0 Comm: swapper/17 Not tainted 6.12.0-rc3-00013-geca631b8fe80 #11 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.0-0-gd239552ce722-prebuilt.qemu.org 04/01/2014 RIP: 0010:_raw_spin_lock_irqsave+0x1d/0x40 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 41 54 9c 41 5c fa 65 ff 05 62 97 30 4c 31 c0 ba 01 00 00 00 <f0> 0f b1 17 75 0a 4c 89 e0 41 5c c3 cc cc cc cc 89 c6 e8 2c 0b 00 RSP: 0018:ffffafe180580ca0 EFLAGS: 00010046 RAX: 0000000000000000 RBX: ffffafe180a3f7a8 RCX: 0000000000000011 RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffffafe180a40084 RBP: 0000000000000000 R08: 00000000001e7240 R09: 0000000000000011 R10: 0000000000000028 R11: 0000000000000888 R12: 0000000000000002 R13: ffffafe180a40084 R14: 0000000000000000 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff9aaf1f280000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffafe180a40084 CR3: 000000010e428002 CR4: 0000000000770ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <IRQ> try_to_wake_up+0x5a/0x6a0 rq_qos_wake_function+0x71/0x80 __wake_up_common+0x75/0xa0 __wake_up+0x36/0x60 scale_up.part.0+0x50/0x110 wb_timer_fn+0x227/0x450 ...So rq_qos_wake_function() calls wake_up_process(data->task), which callstry_to_wake_up(), which faults in raw_spin_lock_irqsave(&p->pi_lock).p comes from data->task, and data comes from the waitqueue entry, whichis stored on the waiter's stack in rq_qos_wait(). Analyzing the coredump with drgn, I found that the waiter had already woken up and movedon to a completely unrelated code path, clobbering what was previouslydata->task. Meanwhile, the waker was passing the clobbered garbage indata->task to wake_up_process(), leading to the crash.What's happening is that in between rq_qos_wake_function() deleting thewaitqueue entry and calling wake_up_process(), rq_qos_wait() is findingthat it already got a token and returning. The race looks like this:rq_qos_wait() rq_qos_wake_function()==============================================================prepare_to_wait_exclusive() data->got_token = true; list_del_init(&curr->entry);if (data.got_token) break;finish_wait(&rqw->wait, &data.wq); ^- returns immediately because list_empty_careful(&wq_entry->entry) is true... return, go do something else ... wake_up_process(data->task) (NO LONGER VALID!)-^Normally, finish_wait() is supposed to synchronize against the waker.But, as noted above, it is returning immediately because the waitqueueentry has already been removed from the waitqueue.The bug is that rq_qos_wake_function() is accessing the waitqueue entryAFTER deleting it. Note that autoremove_wake_function() wakes the waiterand THEN deletes the waitqueue entry, which is the proper order.Fix it by swapping the order. We also need to uselist_del_init_careful() to match the list_empty_careful() infinish_wait().
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### POC
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#### Reference
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No PoCs from references.
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#### Github
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- https://github.com/fkie-cad/nvd-json-data-feeds
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- https://github.com/w4zu/Debian_security
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