Kees Cook <keescook@xxxxxxxxxxxx> writes: > Instead of full GNU diff (which smaller boot environments may not have), > use "comm" which is more available. Although using "comm" requires CONFIG_PRINTK_TIME=y doesn't it? Which is probably fine, but should be mentioned. And I guess for completeness you could add: diff --git a/tools/testing/selftests/lkdtm/config b/tools/testing/selftests/lkdtm/config index d874990e442b..ae88bfb163ff 100644 --- a/tools/testing/selftests/lkdtm/config +++ b/tools/testing/selftests/lkdtm/config @@ -1 +1,2 @@ CONFIG_LKDTM=y +CONFIG_PRINTK_TIME=y cheers > Reported-by: Naresh Kamboju <naresh.kamboju@xxxxxxxxxx> > Link: https://lore.kernel.org/lkml/CA+G9fYtHP+Gg+BrR_GkBMxu2oOi-_e9pATtpb6TVRswv1G1r1Q@xxxxxxxxxxxxxx > Fixes: f131d9edc29d ("selftests/lkdtm: Don't clear dmesg when running tests") > Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx> > --- > tools/testing/selftests/lkdtm/run.sh | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/tools/testing/selftests/lkdtm/run.sh b/tools/testing/selftests/lkdtm/run.sh > index 8383eb89d88a..5fe23009ae13 100755 > --- a/tools/testing/selftests/lkdtm/run.sh > +++ b/tools/testing/selftests/lkdtm/run.sh > @@ -82,7 +82,7 @@ dmesg > "$DMESG" > ($SHELL -c 'cat <(echo '"$test"') >'"$TRIGGER" 2>/dev/null) || true > > # Record and dump the results > -dmesg | diff --changed-group-format='%>' --unchanged-group-format='' "$DMESG" - > "$LOG" || true > +dmesg | comm -13 "$DMESG" - > "$LOG" || true > > cat "$LOG" > # Check for expected output > -- > 2.25.1 > > > -- > Kees Cook
