Re: BUG: KASAN: vmalloc-out-of-bounds in vrealloc_noprof+0x195/0x220 at running fortify_kunit (v6.15-rc1, x86_64)

[Kees Cook <kees@kernel.org>]

On Mon, Apr 21, 2025 at 12:04:08PM +0200, Erhard Furtner wrote:
> fortify_test_alloc_size_kvmalloc_const test failure still in v6.15-rc3, also with a 'GCC14 -O2'-built kernel:
> [...]
> BUG: KASAN: vmalloc-out-of-bounds in vrealloc_noprof+0x2a2/0x370
> [...]
>     not ok 7 fortify_test_alloc_size_kvmalloc_const
> [...]
> > I gave v6.15-rc1 a test ride on my Ryzen 5950 system with some debugging options turned on, getting a KASAN vmalloc-out-of-bounds hit at running fortify_kunit test:

I'm not able to reproduce this yet. What does your .config look like?

I tried this on Linus's latest and next-20250422:

$ gcc --version
gcc (GCC) 14.2.1 20250110 (Red Hat 14.2.1-7)
...
$ ./tools/testing/kunit/kunit.py run \
	--kconfig_add CONFIG_KASAN=y \
	--kconfig_add CONFIG_KASAN_VMALLOC=y \
	fortify

both showing passes:
[16:14:44] Testing complete. Ran 26 tests: passed: 26

What other debugging do you have enabled?

-- 
Kees Cook