From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EFE2EC43332 for ; Thu, 4 Mar 2021 17:46:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C619A64F5C for ; Thu, 4 Mar 2021 17:46:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239709AbhCDRqk (ORCPT ); Thu, 4 Mar 2021 12:46:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238750AbhCDRo6 (ORCPT ); Thu, 4 Mar 2021 12:44:58 -0500 Received: from mail.skyhub.de (mail.skyhub.de [IPv6:2a01:4f8:190:11c2::b:1457]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2285CC061763 for ; Thu, 4 Mar 2021 09:42:56 -0800 (PST) Received: from zn.tnic (p200300ec2f0f5900f7833063514d8659.dip0.t-ipconnect.de [IPv6:2003:ec:2f0f:5900:f783:3063:514d:8659]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id B8D941EC04E2; Thu, 4 Mar 2021 18:42:54 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=alien8.de; s=dkim; t=1614879774; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1qetDyOjsEQm7aDzBgrlUSKoFCFT+6v1j0Cc3oFxGeY=; b=SkPypVjEZdLzULqXsVZ6t3kxrZxmmfoEEa/++EIcZR8NoAhpTwZZi7dp41u6wjvjxAB8z4 s/PzZLkkyHtZxBx/tdOzeM1cwX0g1ye8aJKxv0l3Rd8mbYTtnU3rokBtDOMubvlKPdBOPz ij2+ZeCgGS9KD3U8/ca4WIvg9hSOjZM= From: Borislav Petkov To: X86 ML Cc: Masami Hiramatsu , LKML Subject: [PATCH v3 08/21] perf/x86/intel/ds: Check return values of insn decoder functions Date: Thu, 4 Mar 2021 18:42:24 +0100 Message-Id: <20210304174237.31945-9-bp@alien8.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210304174237.31945-1-bp@alien8.de> References: <20210304174237.31945-1-bp@alien8.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Borislav Petkov branch_type() doesn't need to call the full insn_decode() because it doesn't need it in all cases thus leave the calls separate. Signed-off-by: Borislav Petkov --- arch/x86/events/intel/lbr.c | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c index 21890dacfcfe..9ecf5028fb8f 100644 --- a/arch/x86/events/intel/lbr.c +++ b/arch/x86/events/intel/lbr.c @@ -1224,8 +1224,7 @@ static int branch_type(unsigned long from, unsigned long to, int abort) is64 = kernel_ip((unsigned long)addr) || any_64bit_mode(current_pt_regs()); #endif insn_init(&insn, addr, bytes_read, is64); - insn_get_opcode(&insn); - if (!insn.opcode.got) + if (insn_get_opcode(&insn)) return X86_BR_ABORT; switch (insn.opcode.bytes[0]) { @@ -1262,8 +1261,7 @@ static int branch_type(unsigned long from, unsigned long to, int abort) ret = X86_BR_INT; break; case 0xe8: /* call near rel */ - insn_get_immediate(&insn); - if (insn.immediate1.value == 0) { + if (insn_get_immediate(&insn) || insn.immediate1.value == 0) { /* zero length call */ ret = X86_BR_ZERO_CALL; break; @@ -1279,7 +1277,9 @@ static int branch_type(unsigned long from, unsigned long to, int abort) ret = X86_BR_JMP; break; case 0xff: /* call near absolute, call far absolute ind */ - insn_get_modrm(&insn); + if (insn_get_modrm(&insn)) + return X86_BR_ABORT; + ext = (insn.modrm.bytes[0] >> 3) & 0x7; switch (ext) { case 2: /* near ind call */ -- 2.29.2