Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:riscv: prevent pt_regs corruption for secondary idle threadsTop of the kernel thread stack should be reserved for pt_regs. Howeverthis 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 problemhas been noticed in some CPU hotplug tests with V enabled. The functionsmp_callin stored several registers on stack, corrupting top of pt_regsstructure including status field. As a result, kernel attempted to saveor restore inexistent V context.
No PoCs from references.
- https://github.com/fkie-cad/nvd-json-data-feeds