Date: Wed, 25 Mar 2026 02:25:41 +0000 From: Kyle Evans <kevans@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Cc: Kristofer Peterson <kris@tranception.com> Subject: git: 615f1b9eb17c - main - kern/amd64/machdep: Replace memset in wrmsr_early_safe_end Message-ID: <69c347a5.207ab.65f029f@gitrepo.freebsd.org>
index | next in thread | raw e-mail
The branch main has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=615f1b9eb17c921bbcb0cce2b9ad61910361325b commit 615f1b9eb17c921bbcb0cce2b9ad61910361325b Author: Kristofer Peterson <kris@tranception.com> AuthorDate: 2026-03-09 19:40:34 +0000 Commit: Kyle Evans <kevans@FreeBSD.org> CommitDate: 2026-03-25 02:24:17 +0000 kern/amd64/machdep: Replace memset in wrmsr_early_safe_end GENERIC-KASAN kernel failed to boot on a Dell PowerEdge C6615 with an AMD EPYC 8224P CPU; UEFI BIOS caught a #GP exception with %RIP in kasan_memset where %GS relative pointer (curthread->td_pflags2) was dereferenced. Investigation led to wrmsr_early_safe_end which calls memset to clear early #GP IDT entry. Replacing memset with __builtin_memset_inline still resulted in the compiler emitting a call to the memset resolver in GENERIC-KASAN build and the kernel stil faulted during boot. This version which has been successfully tested with both GENERIC and GENERIC-KASAN kernels uses memset_early. Signed-off-by: Kristofer Peterson <kris@tranception.com> Reviewed-by: kib Pull-Request: https://github.com/freebsd/freebsd-src/pull/2069 --- sys/amd64/amd64/machdep.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/sys/amd64/amd64/machdep.c b/sys/amd64/amd64/machdep.c index e9bb27a54dfb..78199cb2ac03 100644 --- a/sys/amd64/amd64/machdep.c +++ b/sys/amd64/amd64/machdep.c @@ -1850,7 +1850,7 @@ wrmsr_early_safe_end(void) lidt(&wrmsr_early_safe_orig_efi_idt); gpf_descr = &idt0[IDT_GP]; - memset(gpf_descr, 0, sizeof(*gpf_descr)); + memset_early(gpf_descr, 0, sizeof(*gpf_descr)); } #ifdef KDBhome | help
Want to link to this message? Use this
URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?69c347a5.207ab.65f029f>