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18 lines
2.5 KiB
Markdown
18 lines
2.5 KiB
Markdown
### [CVE-2024-56610](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-56610)
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### Description
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In the Linux kernel, the following vulnerability has been resolved:kcsan: Turn report_filterlist_lock into a raw_spinlockRan Xiaokai reports that with a KCSAN-enabled PREEMPT_RT kernel, we can seesplats like:| BUG: sleeping function called from invalid context at kernel/locking/spinlock_rt.c:48| in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 0, name: swapper/1| preempt_count: 10002, expected: 0| RCU nest depth: 0, expected: 0| no locks held by swapper/1/0.| irq event stamp: 156674| hardirqs last enabled at (156673): [<ffffffff81130bd9>] do_idle+0x1f9/0x240| hardirqs last disabled at (156674): [<ffffffff82254f84>] sysvec_apic_timer_interrupt+0x14/0xc0| softirqs last enabled at (0): [<ffffffff81099f47>] copy_process+0xfc7/0x4b60| softirqs last disabled at (0): [<0000000000000000>] 0x0| Preemption disabled at:| [<ffffffff814a3e2a>] paint_ptr+0x2a/0x90| CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.11.0+ #3| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-0-ga698c8995f-prebuilt.qemu.org 04/01/2014| Call Trace:| <IRQ>| dump_stack_lvl+0x7e/0xc0| dump_stack+0x1d/0x30| __might_resched+0x1a2/0x270| rt_spin_lock+0x68/0x170| kcsan_skip_report_debugfs+0x43/0xe0| print_report+0xb5/0x590| kcsan_report_known_origin+0x1b1/0x1d0| kcsan_setup_watchpoint+0x348/0x650| __tsan_unaligned_write1+0x16d/0x1d0| hrtimer_interrupt+0x3d6/0x430| __sysvec_apic_timer_interrupt+0xe8/0x3a0| sysvec_apic_timer_interrupt+0x97/0xc0| </IRQ>On a detected data race, KCSAN's reporting logic checks if it shouldfilter the report. That list is protected by the report_filterlist_lock*non-raw* spinlock which may sleep on RT kernels.Since KCSAN may report data races in any context, convert it to araw_spinlock.This requires being careful about when to allocate memory for the filterlist itself which can be done via KCSAN's debugfs interface. Concurrentmodification of the filter list via debugfs should be rare: the chosenstrategy is to optimistically pre-allocate memory before the criticalsection and discard if unused.
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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/cku-heise/euvd-api-doc
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