linux-kernel - [PATCH AUTOSEL 5.4 2/2] perf ftrace: Fix access to pid in array when setting a pid filter

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-Id: <20210428111150.1343388-2-sashal@kernel.org>
Date:   Wed, 28 Apr 2021 07:11:50 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Thomas Richter <tmricht@...ux.ibm.com>,
        Alexander Schmidt <alexschm@...ibm.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Sumanth Korikkar <sumanthk@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.4 2/2] perf ftrace: Fix access to pid in array when setting a pid filter

From: Thomas Richter <tmricht@...ux.ibm.com>

[ Upstream commit 671b60cb6a897a5b3832fe57657152f2c3995e25 ]

Command 'perf ftrace -v -- ls' fails in s390 (at least 5.12.0rc6).

The root cause is a missing pointer dereference which causes an
array element address to be used as PID.

Fix this by extracting the PID.

Output before:
  # ./perf ftrace -v -- ls
  function_graph tracer is used
  write '-263732416' to tracing/set_ftrace_pid failed: Invalid argument
  failed to set ftrace pid
  #

Output after:
   ./perf ftrace -v -- ls
   function_graph tracer is used
   # tracer: function_graph
   #
   # CPU  DURATION                  FUNCTION CALLS
   # |     |   |                     |   |   |   |
   4)               |  rcu_read_lock_sched_held() {
   4)   0.552 us    |    rcu_lockdep_current_cpu_online();
   4)   6.124 us    |  }

Reported-by: Alexander Schmidt <alexschm@...ibm.com>
Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
Acked-by: Namhyung Kim <namhyung@...nel.org>
Cc: Heiko Carstens <hca@...ux.ibm.com>
Cc: Sumanth Korikkar <sumanthk@...ux.ibm.com>
Cc: Sven Schnelle <svens@...ux.ibm.com>
Cc: Vasily Gorbik <gor@...ux.ibm.com>
Link: http://lore.kernel.org/lkml/20210421120400.2126433-1-tmricht@linux.ibm.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 tools/perf/builtin-ftrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-ftrace.c b/tools/perf/builtin-ftrace.c
index d5adc417a4ca..40b179f54428 100644
--- a/tools/perf/builtin-ftrace.c
+++ b/tools/perf/builtin-ftrace.c
@@ -161,7 +161,7 @@ static int set_tracing_pid(struct perf_ftrace *ftrace)
 
 	for (i = 0; i < perf_thread_map__nr(ftrace->evlist->core.threads); i++) {
 		scnprintf(buf, sizeof(buf), "%d",
-			  ftrace->evlist->core.threads->map[i]);
+			  perf_thread_map__pid(ftrace->evlist->core.threads, i));
 		if (append_tracing_file("set_ftrace_pid", buf) < 0)
 			return -1;
 	}
-- 
2.30.2