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THREATINT
PUBLISHED

CVE-2022-49001

riscv: fix race when vmap stack overflow



Description

In the Linux kernel, the following vulnerability has been resolved: riscv: fix race when vmap stack overflow Currently, when detecting vmap stack overflow, riscv firstly switches to the so called shadow stack, then use this shadow stack to call the get_overflow_stack() to get the overflow stack. However, there's a race here if two or more harts use the same shadow stack at the same time. To solve this race, we introduce spin_shadow_stack atomic var, which will be swap between its own address and 0 in atomic way, when the var is set, it means the shadow_stack is being used; when the var is cleared, it means the shadow_stack isn't being used. [Palmer: Add AQ to the swap, and also some comments.]

Reserved 2024-08-22 | Published 2024-10-21 | Updated 2025-05-04 | Assigner Linux

Product status

Default status
unaffected

31da94c25aea835ceac00575a9fd206c5a833fed before ac00301adb19df54f2eae1efc4bad7447c0156ce
affected

31da94c25aea835ceac00575a9fd206c5a833fed before 879fabc5a95401d9bce357e4b1d24ae4a360a81f
affected

31da94c25aea835ceac00575a9fd206c5a833fed before 7e1864332fbc1b993659eab7974da9fe8bf8c128
affected

Default status
affected

5.14
affected

Any version before 5.14
unaffected

5.15.82
unaffected

6.0.12
unaffected

6.1
unaffected

References

git.kernel.org/...c/ac00301adb19df54f2eae1efc4bad7447c0156ce

git.kernel.org/...c/879fabc5a95401d9bce357e4b1d24ae4a360a81f

git.kernel.org/...c/7e1864332fbc1b993659eab7974da9fe8bf8c128

cve.org (CVE-2022-49001)

nvd.nist.gov (CVE-2022-49001)

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