In the Linux kernel, the following vulnerability has been...
High severity
Unreviewed
Published
Jun 24, 2024
to the GitHub Advisory Database
•
Updated Jun 26, 2024
Description
Published by the National Vulnerability Database
Jun 24, 2024
Published to the GitHub Advisory Database
Jun 24, 2024
Last updated
Jun 26, 2024
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.
References