On Tue, 22 Apr 2025 09:50:24 -0700
Kees Cook <kees@kernel.org> wrote:

> 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

Hi!

Sorry, I forgot to attach my v6.15-rc3 kernel .config. It's basically the same as the -rc1 one from my first report (https://lore.kernel.org/all/20250408192503.6149a816@outsider.home/), but with GCC 14 and -O2 instead of Clang 19 and -Os.

Regards,
Erhard