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selftests/livepatch: Don't clear dmesg when running tests

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Inspired by commit f131d9edc2 ("selftests/lkdtm: Don't clear dmesg
when running tests"), keep a reference dmesg copy when beginning each
test.  This way check_result() can compare against the initial copy
rather than relying upon an empty log.

Signed-off-by: Joe Lawrence <joe.lawrence@redhat.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Reviewed-by: Yannick Cote <ycote@redhat.com>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Signed-off-by: Petr Mladek <pmladek@suse.com>
Link: https://lore.kernel.org/r/20200618181040.21132-2-joe.lawrence@redhat.com
This commit is contained in:
Joe Lawrence
2020-06-18 14:10:38 -04:00
committed by Petr Mladek
parent 270f7806d3
commit 2eeb0d457d
7 changed files with 66 additions and 81 deletions
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4
tools/testing/selftests/livepatch/test-ftrace.sh
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@@ -9,13 +9,11 @@ MOD_LIVEPATCH=test_klp_livepatch
setup_config
# TEST: livepatch interaction with ftrace_enabled sysctl
# - turn ftrace_enabled OFF and verify livepatches can't load
# - turn ftrace_enabled ON and verify livepatch can load
# - verify that ftrace_enabled can't be turned OFF while a livepatch is loaded
echo -n "TEST: livepatch interaction with ftrace_enabled sysctl ... "
dmesg -C
start_test "livepatch interaction with ftrace_enabled sysctl"
set_ftrace_enabled 0
load_failing_mod $MOD_LIVEPATCH