CVE-2024-56701
Description
In the Linux kernel, the following vulnerability has been resolved: powerpc/pseries: Fix dtl_access_lock to be a rw_semaphore The dtl_access_lock needs to be a rw_sempahore, a sleeping lock, because the code calls kmalloc() while holding it, which can sleep: # echo 1 > /proc/powerpc/vcpudispatch_stats BUG: sleeping function called from invalid context at include/linux/sched/mm.h:337 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 199, name: sh preempt_count: 1, expected: 0 3 locks held by sh/199: #0: c00000000a0743f8 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x324/0x438 #1: c0000000028c7058 (dtl_enable_mutex){+.+.}-{3:3}, at: vcpudispatch_stats_write+0xd4/0x5f4 #2: c0000000028c70b8 (dtl_access_lock){+.+.}-{2:2}, at: vcpudispatch_stats_write+0x220/0x5f4 CPU: 0 PID: 199 Comm: sh Not tainted 6.10.0-rc4 #152 Hardware name: IBM pSeries (emulated by qemu) POWER9 (raw) 0x4e1202 0xf000005 of:SLOF,HEAD hv:linux,kvm pSeries Call Trace: dump_stack_lvl+0x130/0x148 (unreliable) __might_resched+0x174/0x410 kmem_cache_alloc_noprof+0x340/0x3d0 alloc_dtl_buffers+0x124/0x1ac vcpudispatch_stats_write+0x2a8/0x5f4 proc_reg_write+0xf4/0x150 vfs_write+0xfc/0x438 ksys_write+0x88/0x148 system_call_exception+0x1c4/0x5a0 system_call_common+0xf4/0x258
How to fix
- linux linux_kernel5.10.231, 5.15.174, 6.1.120, 6.6.64, 6.11.11, 6.12.2 or later
- git.kernel.org/stable/c/525e18f1ba7c2b098c8ba587fb397efb34a6574c
- git.kernel.org/stable/c/6956c0e7346ce1bbfc726755aa8da10d26e84276
- git.kernel.org/stable/c/a246daa26b717e755ccc9061f47f7cd1c0b358dd
- git.kernel.org/stable/c/b125d0cf1adde7b2b47d7337fed7e9133eea3463
- git.kernel.org/stable/c/cadae3a45d23aa4f6485938a67cbc47aaaa25e38
- git.kernel.org/stable/c/f6ec133668757f84e5143f1eb141fd0b83778b9e
- git.kernel.org/stable/c/fa5b5ea257135e771b489c83a2e93b5935d0108e
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.3 ≤ v < 5.10.231, 5.11 ≤ v < 5.15.174, 5.16 ≤ v < 6.1.120, 6.2 ≤ v < 6.6.64, 6.7 ≤ v < 6.11.11, 6.12 ≤ v < 6.12.2 | 5.10.231, 5.15.174, 6.1.120, 6.6.64, 6.11.11, 6.12.2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.