linux-kernel - [PATCH 4.14 030/183] selftest: ftrace: Fix to pick text symbols for kprobes

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Message-Id: <20180425103243.798462067@linuxfoundation.org>
Date:   Wed, 25 Apr 2018 12:34:10 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Masami Hiramatsu <mhiramat@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.org>,
        Shuah Khan <shuahkh@....samsung.com>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.14 030/183] selftest: ftrace: Fix to pick text symbols for kprobes

4.14-stable review patch.  If anyone has any objections, please let me know.

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

From: Masami Hiramatsu <mhiramat@...nel.org>


[ Upstream commit 5e46664703b364434a2cbda3e6988fc24ae0ced5 ]

Fix to pick text symbols for multiple kprobe testcase.
kallsyms shows text symbols with " t " or " T " but
current testcase picks all symbols including "t",
so it picks data symbols if it includes 't' (e.g. "str").

This fixes it to find symbol lines with " t " or " T "
(including spaces).

Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
Reported-by: Russell King <linux@...linux.org.uk>
Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/multiple_kprobes.tc
@@ -12,8 +12,8 @@ case `uname -m` in
   *) OFFS=0;;
 esac
 
-echo "Setup up to 256 kprobes"
-grep t /proc/kallsyms | cut -f3 -d" " | grep -v .*\\..* | \
+echo "Setup up kprobes on first 256 text symbols"
+grep -i " t " /proc/kallsyms | cut -f3 -d" " | grep -v .*\\..* | \
 head -n 256 | while read i; do echo p ${i}+${OFFS} ; done > kprobe_events ||:
 
 echo 1 > events/kprobes/enable