1.3 KiB
CVE-2024-26710
Description
In the Linux kernel, the following vulnerability has been resolved:powerpc/kasan: Limit KASAN thread size increase to 32KBKASAN is seen to increase stack usage, to the point that it was reportedto lead to stack overflow on some 32-bit machines (see link).To avoid overflows the stack size was doubled for KASAN builds incommit 3e8635fb2e07 ("powerpc/kasan: Force thread size increase withKASAN").However with a 32KB stack size to begin with, the doubling leads to a64KB 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 seemssufficient even for KASAN builds - the additional usage seems to be inthe 2-3KB range for a 64-bit KASAN build.So only increase the stack for KASAN if the stack size is < 32KB.
POC
Reference
No PoCs from references.