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selftests/lkdtm: Avoid needing explicit sub-shell
commit 04831e8 upstream. Some environments do not set $SHELL when running tests. There's no need to use $SHELL here anyway, since "cat" can be used to receive any delivered signals from the kernel. Additionally avoid using bash-isms in the command, and record stderr for posterity. Fixes: 46d1a0f ("selftests/lkdtm: Add tests for LKDTM targets") Cc: stable@vger.kernel.org Suggested-by: Guillaume Tucker <guillaume.tucker@collabora.com> Suggested-by: David Laight <David.Laight@ACULAB.COM> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20210623203936.3151093-2-keescook@chromium.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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