From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by dpdk.space (Postfix) with ESMTP id 90EECA0096 for ; Wed, 8 May 2019 12:16:47 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 8845B2BD5; Wed, 8 May 2019 12:16:47 +0200 (CEST) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by dpdk.org (Postfix) with ESMTP id 06D5437B7 for ; Wed, 8 May 2019 12:16:46 +0200 (CEST) Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 678C5C058CC0; Wed, 8 May 2019 10:16:45 +0000 (UTC) Received: from rh.redhat.com (ovpn-117-210.ams2.redhat.com [10.36.117.210]) by smtp.corp.redhat.com (Postfix) with ESMTP id 6A1081A267; Wed, 8 May 2019 10:16:44 +0000 (UTC) From: Kevin Traynor To: Reshma Pattan Cc: Anatoly Burakov , dpdk stable Date: Wed, 8 May 2019 11:15:15 +0100 Message-Id: <20190508101534.8984-33-ktraynor@redhat.com> In-Reply-To: <20190508101534.8984-1-ktraynor@redhat.com> References: <20190508101534.8984-1-ktraynor@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Wed, 08 May 2019 10:16:45 +0000 (UTC) Subject: [dpdk-stable] patch 'examples/power: fix overflowed value' has been queued to LTS release 18.11.2 X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org Sender: "stable" Hi, FYI, your patch has been queued to LTS release 18.11.2 Note it hasn't been pushed to http://dpdk.org/browse/dpdk-stable yet. It will be pushed if I get no objections before 05/13/19. So please shout if anyone has objections. Also note that after the patch there's a diff of the upstream commit vs the patch applied to the branch. This will indicate if there was any rebasing needed to apply to the stable branch. If there were code changes for rebasing (ie: not only metadata diffs), please double check that the rebase was correctly done. Queued patches are on a temporary branch at: https://github.com/kevintraynor/dpdk-stable-queue This queued commit can be viewed at: https://github.com/kevintraynor/dpdk-stable-queue/commit/ef24b4826f540c0489aadd2c84d9c22e2510a014 Thanks. Kevin Traynor --- >From ef24b4826f540c0489aadd2c84d9c22e2510a014 Mon Sep 17 00:00:00 2001 From: Reshma Pattan Date: Thu, 11 Apr 2019 12:13:36 +0100 Subject: [PATCH] examples/power: fix overflowed value [ upstream commit 7e7b7a1f427013374f38e1b101969a1dbce5c9c1 ] Fix the data type of last_branches, last_branch_misses from uint32_t to uint64_t, and for hits_diff, miss_diff from int to int64_t respectively to fix possible overflow or truncation. Coverity issue: 337677 Fixes: 4b1a631b8a ("examples/vm_power: add oob monitoring functions") Signed-off-by: Reshma Pattan Reviewed-by: Anatoly Burakov --- examples/vm_power_manager/oob_monitor_x86.c | 23 ++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) diff --git a/examples/vm_power_manager/oob_monitor_x86.c b/examples/vm_power_manager/oob_monitor_x86.c index 589c604e5..ebd96b205 100644 --- a/examples/vm_power_manager/oob_monitor_x86.c +++ b/examples/vm_power_manager/oob_monitor_x86.c @@ -34,8 +34,8 @@ apply_policy(int core) { struct core_info *ci; - uint64_t counter; + uint64_t counter = 0; uint64_t branches, branch_misses; - uint32_t last_branches, last_branch_misses; - int hits_diff, miss_diff; + uint64_t last_branches, last_branch_misses; + int64_t hits_diff, miss_diff; float ratio; int ret; @@ -55,4 +55,5 @@ apply_policy(int core) branches = counter; + counter = 0; ret = pread(ci->cd[core].msr_fd, &counter, sizeof(counter), IA32_PERFCTR1); @@ -67,5 +68,11 @@ apply_policy(int core) ci->cd[core].last_branch_misses = branch_misses; - hits_diff = (int)branches - (int)last_branches; + /* + * Intentional right shift to make MSB 0 to avoid + * possible signed overflow or truncation. + */ + branches >>= 1; + last_branches >>= 1; + hits_diff = (int64_t)branches - (int64_t)last_branches; if (hits_diff <= 0) { /* Likely a counter overflow condition, skip this round */ @@ -73,5 +80,11 @@ apply_policy(int core) } - miss_diff = (int)branch_misses - (int)last_branch_misses; + /* + * Intentional right shift to make MSB 0 to avoid + * possible signed overflow or truncation. + */ + branch_misses >>= 1; + last_branch_misses >>= 1; + miss_diff = (int64_t)branch_misses - (int64_t)last_branch_misses; if (miss_diff <= 0) { /* Likely a counter overflow condition, skip this round */ -- 2.20.1 --- Diff of the applied patch vs upstream commit (please double-check if non-empty: --- --- - 2019-05-08 11:05:07.473473845 +0100 +++ 0033-examples-power-fix-overflowed-value.patch 2019-05-08 11:05:05.815933054 +0100 @@ -1 +1 @@ -From 7e7b7a1f427013374f38e1b101969a1dbce5c9c1 Mon Sep 17 00:00:00 2001 +From ef24b4826f540c0489aadd2c84d9c22e2510a014 Mon Sep 17 00:00:00 2001 @@ -5,0 +6,2 @@ +[ upstream commit 7e7b7a1f427013374f38e1b101969a1dbce5c9c1 ] + @@ -13 +14,0 @@ -Cc: stable@dpdk.org