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

Vulnerability 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.

References

• https://git.kernel.org/stable/c/f9a4c401bf4c5af3437ad221c0a5880a518068d4
• https://git.kernel.org/stable/c/4cc31fa07445879a13750cb061bb8c2654975fcb
• https://git.kernel.org/stable/c/b29b16bd836a838b7690f80e37f8376414c74cbe
• https://git.kernel.org/stable/c/f1acb109505d983779bbb7e20a1ee6244d2b5736