From nobody Sun Apr 12 03:16:41 2026 X-Original-To: dev-commits-src-branches@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4ftbL22BrXz6YM7Y for ; Sun, 12 Apr 2026 03:16:42 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R12" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id 4ftbL16G9Rz3NwP for ; Sun, 12 Apr 2026 03:16:41 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1775963801; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=oGrMK/RXi2rLpaRFZWlF3hEycrwctjHt0RabN5P0EOQ=; b=csPkxzzakSyW6c+dZDHge0doKVaQ6VhT35QJWadi+HpLQep9Ni1TvMGtedUc98wNie1fSQ K+2i++5vRwaD2KDTM8I/bU3o6F8bKLpdPhubaVw2wAhxCnZQjrGoPjGsvvulxQ+obPPDhw di2UqZ4rSGAUFfMQUMzekSLwRUZPOVCjDkIkdaNRKDX8D3sI9HMIBEB0Be7UzCWjc4qvy0 +CgUkaIv4nSNHTBlyZBsrX8HJxuScUa+2mdVXbXfISTLBaw4tY5aSxlANF2e0imLoZiluD vDzuZcNoj2OzIV+BAHhLgbMPqVtaGBfrHe/HC9eOE+2euEBUjf8EDMkdy5e7dw== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1775963801; a=rsa-sha256; cv=none; b=kscDLGFsOZG3uJr6BKninXVTZfA0yF7ogAS8oWxxyDgDkkTxaJc5RRf2fbAxcazoIt30q5 FzKqwqsoyHTHmi+yMioUTmKqn4f3rLA46rSep6ITsrxE/qUUMa5iFkquruvDOru3hnXgSA bAr73RMkblD+Vgs/+xYpVl9LKLADbPNkdTU2XwVJrl6GffIDCPVg2I/QovLZWclajitumi oEjtIgA9149CRkPAa6DaFJUF75+tWvA0OAJRq5GO1IlB0LuBwWWmDYXmCSOkpoUGZ96J23 q5zkQjbS3vCtaksnTmt0DKiDYpcff+1ILroJ5wCjiyzfnY7dmK02oJf/IwsANA== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1775963801; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=oGrMK/RXi2rLpaRFZWlF3hEycrwctjHt0RabN5P0EOQ=; b=y1xePzDAE5Rba+2mEvmSW4SPo5wK28j0lN4I94SftJihhYZAV/WKopsrWN9pjYKx5sXiqn bHTXbvAc8QePN+jM1JoT6Hif8AhguSBlr5RDZ3o98knmor6Rc6PZl3yxp+DGwxQX688RLX ULiCWrDemOg0/3VqWNrsGRdxzOJmDXlHENEqxfRP1sdSV+DrMu6OMrfn3E7m3vH4CSfb6I rCp2iCenFpjLj7sXDWdA2zQJaZVX4g6FuQwwKZMxVwYfhNHR8t9U0JID79uPiiScQa0cYz mCeIBJCXt8pH98y4AWegFTPcZoT9RUhmg2bNDFyXZHI9YKn4GPMpDVv2upUG6Q== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) by mxrelay.nyi.freebsd.org (Postfix) with ESMTP id 4ftbL145NCz10CR for ; Sun, 12 Apr 2026 03:16:41 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from git (uid 1279) (envelope-from git@FreeBSD.org) id 47ba8 by gitrepo.freebsd.org (DragonFly Mail Agent v0.13+ on gitrepo.freebsd.org); Sun, 12 Apr 2026 03:16:41 +0000 To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Cc: Kristofer Peterson From: Kyle Evans Subject: git: fee3eba10ff1 - stable/15 - kern/amd64/machdep: Replace memset in wrmsr_early_safe_end List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: X-BeenThere: dev-commits-src-branches@freebsd.org Sender: owner-dev-commits-src-branches@FreeBSD.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: kevans X-Git-Repository: src X-Git-Refname: refs/heads/stable/15 X-Git-Reftype: branch X-Git-Commit: fee3eba10ff14541ab2036a3b6420ab29e5cba66 Auto-Submitted: auto-generated Date: Sun, 12 Apr 2026 03:16:41 +0000 Message-Id: <69db0e99.47ba8.34857698@gitrepo.freebsd.org> The branch stable/15 has been updated by kevans: URL: https://cgit.FreeBSD.org/src/commit/?id=fee3eba10ff14541ab2036a3b6420ab29e5cba66 commit fee3eba10ff14541ab2036a3b6420ab29e5cba66 Author: Kristofer Peterson AuthorDate: 2026-03-09 19:40:34 +0000 Commit: Kyle Evans CommitDate: 2026-04-12 03:15:15 +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 Reviewed-by: kib (cherry picked from commit 615f1b9eb17c921bbcb0cce2b9ad61910361325b) --- 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 2af7f1151208..2c69c1b3ace5 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 KDB