From mboxrd@z Thu Jan 1 00:00:00 1970 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 0A23C144D0B; Thu, 13 Jun 2024 12:37:35 +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=1718282256; cv=none; b=H/WroBlkdXR9d5Keekuqu9Db27FHzfjS/xVn02EnwYimXniF5IACt6XusWIidR/FAjQc2vOQB0vOiaGO8PwyykTL/DkF8+dTHSzzIjjM2cAXhVxfEr5zimrEbaJvBagcmVwHxkHn9WAZTaVgWDmBCb7YdaWa8wMSej8/dBCkpnA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1718282256; c=relaxed/simple; bh=2YGhwGGMmnkD/ru9J4BKN6ORPeC7sWZi6yQteSjboak=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=hwlU1DN1lI5c5x8I87HeDwUDuDRA2fljPAXhx2+XO7HMurnLProIidykdo8vX+o2kuqFrOOUqKULsOxljeHxCv8Lf59UHWtG7HR2pSvsW7g9GLB+IVqy25B/PGtk/0Ku+YAQ7u5wQYL6pBFyPrtXvfxy2n6t5qY43BDiF6OQRyU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=U7gn1iYC; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="U7gn1iYC" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 719FAC4AF51; Thu, 13 Jun 2024 12:37:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1718282255; bh=2YGhwGGMmnkD/ru9J4BKN6ORPeC7sWZi6yQteSjboak=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=U7gn1iYCgX+QeV2qCe6uEk7rd5ZZZjMUFBCZBDr166j2Llduh+8/8rsV4PTw4l0b4 iaTv+JKIFw8jTB1lF1RArnjeLMu+iJfcwaIX+jVCHrqA0xtTylNzTLiJsLjl1QelnH voTuWkmqqHqt5A7VVS0yZxFRMOCeXbNsGmj0VZIU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ian Rogers , Adrian Hunter , Jiri Olsa , Namhyung Kim , Arnaldo Carvalho de Melo , Sasha Levin Subject: [PATCH 5.15 214/402] perf intel-pt: Fix unassigned instruction op (discovered by MemorySanitizer) Date: Thu, 13 Jun 2024 13:32:51 +0200 Message-ID: <20240613113310.497334696@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240613113302.116811394@linuxfoundation.org> References: <20240613113302.116811394@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Adrian Hunter [ Upstream commit e101a05f79fd4ee3e89d2f3fb716493c33a33708 ] MemorySanitizer discovered instances where the instruction op value was not assigned.: WARNING: MemorySanitizer: use-of-uninitialized-value #0 0x5581c00a76b3 in intel_pt_sample_flags tools/perf/util/intel-pt.c:1527:17 Uninitialized value was stored to memory at #0 0x5581c005ddf8 in intel_pt_walk_insn tools/perf/util/intel-pt-decoder/intel-pt-decoder.c:1256:25 The op value is used to set branch flags for branch instructions encountered when walking the code, so fix by setting op to INTEL_PT_OP_OTHER in other cases. Fixes: 4c761d805bb2d2ea ("perf intel-pt: Fix intel_pt_fup_event() assumptions about setting state type") Reported-by: Ian Rogers Signed-off-by: Adrian Hunter Tested-by: Ian Rogers Cc: Jiri Olsa Cc: Namhyung Kim Closes: https://lore.kernel.org/linux-perf-users/20240320162619.1272015-1-irogers@google.com/ Link: https://lore.kernel.org/r/20240326083223.10883-1-adrian.hunter@intel.com Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Sasha Levin --- tools/perf/util/intel-pt-decoder/intel-pt-decoder.c | 2 ++ tools/perf/util/intel-pt.c | 2 ++ 2 files changed, 4 insertions(+) diff --git a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c index b9f94f198a3eb..3530551b82819 100644 --- a/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c +++ b/tools/perf/util/intel-pt-decoder/intel-pt-decoder.c @@ -1215,6 +1215,8 @@ static bool intel_pt_fup_event(struct intel_pt_decoder *decoder) bool ret = false; decoder->state.type &= ~INTEL_PT_BRANCH; + decoder->state.insn_op = INTEL_PT_OP_OTHER; + decoder->state.insn_len = 0; if (decoder->set_fup_tx_flags) { decoder->set_fup_tx_flags = false; diff --git a/tools/perf/util/intel-pt.c b/tools/perf/util/intel-pt.c index 805bad9364e94..b00776c65c186 100644 --- a/tools/perf/util/intel-pt.c +++ b/tools/perf/util/intel-pt.c @@ -721,6 +721,7 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn, bool nr; intel_pt_insn->length = 0; + intel_pt_insn->op = INTEL_PT_OP_OTHER; if (to_ip && *ip == to_ip) goto out_no_cache; @@ -816,6 +817,7 @@ static int intel_pt_walk_next_insn(struct intel_pt_insn *intel_pt_insn, if (to_ip && *ip == to_ip) { intel_pt_insn->length = 0; + intel_pt_insn->op = INTEL_PT_OP_OTHER; goto out_no_cache; } -- 2.43.0