First published: Mon Jun 24 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Software | Affected Version | How to fix |
---|---|---|
Linux Linux kernel | <5.7 | |
Linux Linux kernel | >=6.1<6.1.93 | |
Linux Linux kernel | >=6.6<6.6.33 | |
Linux Linux kernel | >=6.9<6.9.4 | |
Linux Linux kernel | =6.10.0-rc1 | |
debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.106-3 6.1.112-1 6.11.5-1 6.11.6-1 |
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