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PUBLISHED

CVE-2024-26712

powerpc/kasan: Fix addr error caused by page alignment

Reserved:2024-02-19
Published:2024-04-03
Updated:2024-04-03

Description

In the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Fix addr error caused by page alignment In kasan_init_region, when k_start is not page aligned, at the begin of for loop, k_cur = k_start & PAGE_MASK is less than k_start, and then `va = block + k_cur - k_start` is less than block, the addr va is invalid, because the memory address space from va to block is not alloced by memblock_alloc, which will not be reserved by memblock_reserve later, it will be used by other places. As a result, memory overwriting occurs. for example: int __init __weak kasan_init_region(void *start, size_t size) { [...] /* if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) */ block = memblock_alloc(k_end - k_start, PAGE_SIZE); [...] for (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) { /* at the begin of for loop * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400) * va(dcd96c00) is less than block(dcd97000), va is invalid */ void *va = block + k_cur - k_start; [...] } [...] } Therefore, page alignment is performed on k_start before memblock_alloc() to ensure the validity of the VA address.

Product status

Default status
unaffected

663c0c9496a6 before 230e89b5ad0a
affected

663c0c9496a6 before 2738e0aa2fb2
affected

663c0c9496a6 before 0c09912dd838
affected

663c0c9496a6 before 0516c06b19dc
affected

663c0c9496a6 before 70ef2ba1f428
affected

663c0c9496a6 before 4a7aee96200a
affected

Default status
affected

5.4
affected

Any version before 5.4
unaffected

5.10.210
unaffected

5.15.149
unaffected

6.1.79
unaffected

6.6.18
unaffected

6.7.6
unaffected

6.8
unaffected

References

https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882

https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6

https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058

https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe

https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25

https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0

cve.org CVE-2024-26712

nvd.nist.gov CVE-2024-26712

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