linux-kernel - [PATCH 3.2 089/101] tracing: Use strlcpy() instead of strcpy() in __trace_find

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Message-ID: <lsq.1496331655.774535987@decadent.org.uk>
Date:   Thu, 01 Jun 2017 16:40:55 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Amit Pundir" <amit.pundir@...aro.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        "Amey Telawane" <ameyt@...eaurora.org>
Subject: [PATCH 3.2 089/101] tracing: Use strlcpy() instead of strcpy() in
 __trace_find_cmdline()

3.2.89-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Amey Telawane <ameyt@...eaurora.org>

commit e09e28671cda63e6308b31798b997639120e2a21 upstream.

Strcpy is inherently not safe, and strlcpy() should be used instead.
__trace_find_cmdline() uses strcpy() because the comms saved must have a
terminating nul character, but it doesn't hurt to add the extra protection
of using strlcpy() instead of strcpy().

Link: http://lkml.kernel.org/r/1493806274-13936-1-git-send-email-amit.pundir@linaro.org

Signed-off-by: Amey Telawane <ameyt@...eaurora.org>
[AmitP: Cherry-picked this commit from CodeAurora kernel/msm-3.10
https://source.codeaurora.org/quic/la/kernel/msm-3.10/commit/?id=2161ae9a70b12cf18ac8e5952a20161ffbccb477]
Signed-off-by: Amit Pundir <amit.pundir@...aro.org>
[ Updated change log and removed the "- 1" from len parameter ]
Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 kernel/trace/trace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -1100,7 +1100,7 @@ void trace_find_cmdline(int pid, char co
 	arch_spin_lock(&trace_cmdline_lock);
 	map = map_pid_to_cmdline[pid];
 	if (map != NO_CMDLINE_MAP)
-		strcpy(comm, saved_cmdlines[map]);
+		strlcpy(comm, saved_cmdlines[map], TASK_COMM_LEN);
 	else
 		strcpy(comm, "<...>");