CVE-2024-38667
Description
In the Linux kernel, the following vulnerability has been resolved:
riscv: prevent pt_regs corruption for secondary idle threads
Top of the kernel thread stack should be reserved for pt_regs. However this is not the case for the idle threads of the secondary boot harts. Their stacks overlap with their pt_regs, so both may get corrupted.
Similar issue has been fixed for the primary hart, see c7cdd96eca28 ("riscv: prevent stack corruption by reserving task_pt_regs(p) early"). However that fix was not propagated to the secondary harts. The problem has been noticed in some CPU hotplug tests with V enabled. The function smp_callin stored several registers on stack, corrupting top of pt_regs structure including status field. As a result, kernel attempted to save or restore inexistent V context.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
3Patches
Vulnerability mechanics
References
4- git.kernel.org/stable/c/0c1f28c32a194303da630fca89481334b9547b80nvdMailing ListPatch
- git.kernel.org/stable/c/3090c06d50eaa91317f84bf3eac4c265e6cb8d44nvdPatch
- git.kernel.org/stable/c/a638b0461b58aa3205cd9d5f14d6f703d795b4afnvdPatch
- git.kernel.org/stable/c/ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9envdPatch
News mentions
0No linked articles in our index yet.