Date: Tue, 10 Feb 2026 15:10:56 +0000 From: Mark Johnston <markj@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: 4c23a98ba3af - main - asan: Use memset_early() to fill shadow memory Message-ID: <698b4a80.44429.ff2105c@gitrepo.freebsd.org>
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The branch main has been updated by markj: URL: https://cgit.FreeBSD.org/src/commit/?id=4c23a98ba3af3a00004fd7ef54e6330b4d665d55 commit 4c23a98ba3af3a00004fd7ef54e6330b4d665d55 Author: Mark Johnston <markj@FreeBSD.org> AuthorDate: 2026-02-10 13:53:52 +0000 Commit: Mark Johnston <markj@FreeBSD.org> CommitDate: 2026-02-10 15:10:39 +0000 asan: Use memset_early() to fill shadow memory __builtin_memset() calls are replaced with calls to memset(), but that can't be used before ifunc relocations are processed if the implementation is selected at boot time. Meanwhile, the sanitizer may emit calls to __asan_set_shadow_*() as soon as locore jumps into C code, before ifuncs are selected. Just unconditionally use memset_early() to work around this. Reported by: andrew MFC after: 1 week Differential Revision: https://reviews.freebsd.org/D55079 --- sys/kern/subr_asan.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/sys/kern/subr_asan.c b/sys/kern/subr_asan.c index fee6c1a844e2..867d232198b9 100644 --- a/sys/kern/subr_asan.c +++ b/sys/kern/subr_asan.c @@ -241,7 +241,7 @@ kasan_shadow_Nbyte_fill(const void *addr, size_t size, uint8_t code) shad = (void *)kasan_md_addr_to_shad((uintptr_t)addr); size = size >> KASAN_SHADOW_SCALE_SHIFT; - __builtin_memset(shad, code, size); + memset_early(shad, code, size); } /* @@ -1168,7 +1168,7 @@ __asan_handle_no_return(void) void __asan_set_shadow_##byte(void *, size_t); \ void __asan_set_shadow_##byte(void *addr, size_t size) \ { \ - __builtin_memset((void *)addr, 0x##byte, size); \ + memset_early((void *)addr, 0x##byte, size); \ } ASAN_SET_SHADOW(00);home | help
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