From nobody Sun Feb 8 14:59:26 2026 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D224C1D54FD; Tue, 3 Sep 2024 04:00:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725336039; cv=none; b=Bi7vFhtTR59glBiLDWcWrgb/u3ZTw6HdIwsdfaGF9HkBZc8o68HOh0ujrPpRRLQkMLD0L141WqHjjm3+rwBAeYVbeXOfw+dnGSDGgiyAuYxUvIxsRwoTwnfvsxw5RB637QkLoDjte/aet8y97XpxklbMoH79HJdBsYbfQIJrpCQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725336039; c=relaxed/simple; bh=dzKVrdzTcHSO61YSnRdTuu8RumHoQqa7Gn5nYXj8C5Y=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=lavnL/31j3Qr8tsJ+LEZ3hYzs+zJn8jTvTPIQCrOw+sWOOM9EUTLX9FVBZCXnnoQfT4jSPIgIuTfMcpKoc9d7Rf8mZjUhasa6YzQX6strxm3E/lgjUIN4v5HCjIrVOm2Dth+yjdBItudeg1TjV6FwWkMWFSQdCtXJIqYmYdKA0U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nHONwC1X; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nHONwC1X" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1302DC4CECC; Tue, 3 Sep 2024 04:00:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725336039; bh=dzKVrdzTcHSO61YSnRdTuu8RumHoQqa7Gn5nYXj8C5Y=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=nHONwC1XuyQHnkdrm1PmBYct7yxb00XIXmHeADwkm2YnI5DjmdHmHLnBNutcNpg2O Hcoezj4bLXCDfIxY9agxSJwIr1hPU41+eFaXI1/NBfm6B3qDTgcF8ViSKSsYH+r8YI Si1d73vbKk4JxUJTUt5A5xfigeSI7mNw2GKnaCVRQqq8K1gcRsfC+51Jc8T3E2bprt 1tf0/uOAigiTaLg+Df57gPdK9C0DiD9S+1o7j8xxM3T0PhtDPzUjiDT6tk5uWzqaYU tROn0ijwlIkpe8D0n83uy4Wqe+qdCFkv0Abq29BanEL5ts5rMfblm9epBKFltu552d 0Msl55KJDfS6A== From: Josh Poimboeuf To: live-patching@vger.kernel.org Cc: linux-kernel@vger.kernel.org, x86@kernel.org, Miroslav Benes , Petr Mladek , Joe Lawrence , Jiri Kosina , Peter Zijlstra , Marcos Paulo de Souza , Song Liu Subject: [RFC 20/31] objtool: Add UD1 detection Date: Mon, 2 Sep 2024 21:00:03 -0700 Message-ID: <20e0e2662239a042a10196e8f240ce596b250ae8.1725334260.git.jpoimboe@kernel.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" A UD1 isn't a BUG and shouldn't be treated like one. Signed-off-by: Josh Poimboeuf --- tools/objtool/arch/x86/decode.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/tools/objtool/arch/x86/decode.c b/tools/objtool/arch/x86/decod= e.c index 6b34b058a821..72d55dcd3d7f 100644 --- a/tools/objtool/arch/x86/decode.c +++ b/tools/objtool/arch/x86/decode.c @@ -528,11 +528,19 @@ int arch_decode_instruction(struct objtool_file *file= , const struct section *sec /* sysenter, sysret */ insn->type =3D INSN_CONTEXT_SWITCH; =20 - } else if (op2 =3D=3D 0x0b || op2 =3D=3D 0xb9) { + } else if (op2 =3D=3D 0x0b) { =20 /* ud2 */ insn->type =3D INSN_BUG; =20 + } else if (op2 =3D=3D 0xb9) { + + /* + * ud1 - only used for the static call trampoline to + * stop speculation. Basically used like an int3. + */ + insn->type =3D INSN_TRAP; + } else if (op2 =3D=3D 0x0d || op2 =3D=3D 0x1f) { =20 /* nopl/nopw */ --=20 2.45.2