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PUBLISHED

CVE-2024-26710

powerpc/kasan: Limit KASAN thread size increase to 32KB

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

Description

In the Linux kernel, the following vulnerability has been resolved: powerpc/kasan: Limit KASAN thread size increase to 32KB KASAN is seen to increase stack usage, to the point that it was reported to lead to stack overflow on some 32-bit machines (see link). To avoid overflows the stack size was doubled for KASAN builds in commit 3e8635fb2e07 ("powerpc/kasan: Force thread size increase with KASAN"). However with a 32KB stack size to begin with, the doubling leads to a 64KB stack, which causes build errors: arch/powerpc/kernel/switch.S:249: Error: operand out of range (0x000000000000fe50 is not between 0xffffffffffff8000 and 0x0000000000007fff) Although the asm could be reworked, in practice a 32KB stack seems sufficient even for KASAN builds - the additional usage seems to be in the 2-3KB range for a 64-bit KASAN build. So only increase the stack for KASAN if the stack size is < 32KB.

Product status

Default status
unaffected

9ccf64e763ac before 4297217bcf1f
affected

b38014874530 before 4cc31fa07445
affected

58f396513cb1 before b29b16bd836a
affected

18f14afe2816 before f1acb109505d
affected

Default status
unaffected

6.1.75 before 6.1.79
affected

6.6.14 before 6.6.18
affected

6.7.2 before 6.7.6
affected

References

https://git.kernel.org/stable/c/4297217bcf1f0948a19c2bacc6b68d92e7778ad9

https://git.kernel.org/stable/c/4cc31fa07445879a13750cb061bb8c2654975fcb

https://git.kernel.org/stable/c/b29b16bd836a838b7690f80e37f8376414c74cbe

https://git.kernel.org/stable/c/f1acb109505d983779bbb7e20a1ee6244d2b5736

cve.org CVE-2024-26710

nvd.nist.gov CVE-2024-26710

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