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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
2875fe0561569f82d0e63658ccf0d11ce7da8922 to < ea22d4195cca13d5fdbc4d6555a2dfb8a7867a9eaffected2875fe0561569f82d0e63658ccf0d11ce7da8922 to < 3090c06d50eaa91317f84bf3eac4c265e6cb8d44affected2875fe0561569f82d0e63658ccf0d11ce7da8922 to < 0c1f28c32a194303da630fca89481334b9547b80affected2875fe0561569f82d0e63658ccf0d11ce7da8922 to < a638b0461b58aa3205cd9d5f14d6f703d795b4afaffected
Linux Linux
Default version status: affected
5.7affected0 to < 5.7unaffected6.1.93 to ≤ 6.1.*unaffected6.6.33 to ≤ 6.6.*unaffected6.9.4 to ≤ 6.9.*unaffected6.10 to ≤ *unaffected