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selftests/ftrace: Add new test case which checks non unique symbol

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[ Upstream commit 03b80ff8023adae6780e491f66e932df8165e3a0 ]

If name_show() is non unique, this test will try to install a kprobe on this
function which should fail returning EADDRNOTAVAIL.
On kernel where name_show() is not unique, this test is skipped.

Link: https://lore.kernel.org/all/20231020104250.9537-3-flaniel@linux.microsoft.com/

Cc: stable@vger.kernel.org
Signed-off-by: Francis Laniel <flaniel@linux.microsoft.com>
Acked-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Francis Laniel 2023-10-20 13:42:50 +03:00 committed by Greg Kroah-Hartman
parent 4d057ca86e
commit fbe17a8be1
1 changed files with 13 additions and 0 deletions
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13
tools/testing/selftests/ftrace/test.d/kprobe/kprobe_non_uniq_symbol.tc Normal file
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#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# description: Test failure of registering kprobe on non unique symbol
# requires: kprobe_events
SYMBOL='name_show'
# We skip this test on kernel where SYMBOL is unique or does not exist.
if [ "$(grep -c -E "[[:alnum:]]+ t ${SYMBOL}" /proc/kallsyms)" -le '1' ]; then
exit_unsupported
fi
! echo "p:test_non_unique ${SYMBOL}" > kprobe_events