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selftests/ftrace: Use readelf to find entry point in uprobe test

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The uprobe events test fails on s390, but also on x86 (Fedora 41). The
problem appears to be that there is an assumption that adding a uprobe to
the beginning of the executable mapping of /bin/sh is sufficient to trigger
a uprobe event when /bin/sh is executed.

This assumption is not necessarily true. Therefore use "readelf -h" to find
the entry point address of /bin/sh and use this address when adding the
uprobe event.

This adds a dependency to readelf which is not always installed. Therefore
add a check and exit with exit_unresolved if it is not installed.

Link: https://lore.kernel.org/r/20250220130102.2079179-1-hca@linux.ibm.com
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Heiko Carstens 2025-02-20 14:01:02 +01:00 committed by Shuah Khan
parent e402c70856
commit dc4b165855
1 changed files with 7 additions and 3 deletions
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10
tools/testing/selftests/ftrace/test.d/dynevent/add_remove_uprobe.tc
View File

@ -3,14 +3,18 @@
# description: Generic dynamic event - add/remove/test uprobe events
# requires: uprobe_events
if ! which readelf > /dev/null 2>&1 ; then
echo "No readelf found. skipped."
exit_unresolved
fi
echo 0 > events/enable
echo > dynamic_events
REALBIN=`readlink -f /bin/sh`
ENTRYPOINT=`readelf -h ${REALBIN} | grep Entry | sed -e 's/[^0]*//'`
echo 'cat /proc/$$/maps' | /bin/sh | \
grep "r-xp .*${REALBIN}$" | \
awk '{printf "p:myevent %s:0x%s\n", $6,$3 }' >> uprobe_events
echo "p:myevent ${REALBIN}:${ENTRYPOINT}" >> uprobe_events
grep -q myevent uprobe_events
test -d events/uprobes/myevent