linux-hardening - [PATCH] selftests/exec: Convert remaining /bin/sh to /bin/bash

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Date: Mon, 18 Mar 2024 11:16:42 -0700
From: Kees Cook <keescook@...omium.org>
To: Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc: Kees Cook <keescook@...omium.org>,
	Eric Biederman <ebiederm@...ssion.com>,
	Shuah Khan <shuah@...nel.org>,
	"kernelci.org bot" <bot@...nelci.org>,
	Yang Yingliang <yangyingliang@...wei.com>,
	linux-mm@...ck.org,
	linux-kselftest@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-hardening@...r.kernel.org
Subject: [PATCH] selftests/exec: Convert remaining /bin/sh to /bin/bash

As was intended with commit 17107429947b ("selftests/exec: Perform script
checks with /bin/bash"), convert the other instance of /bin/sh to
/bin/bash. It appears that at least Debian Bookworm's /bin/sh (dash)
does not conform to POSIX's "return 127 when script not found"
requirement.

Fixes: 17107429947b ("selftests/exec: Perform script checks with /bin/bash")
Reported-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
Closes: https://lore.kernel.org/lkml/02c8bf8e-1934-44ab-a886-e065b37366a7@collabora.com/
Signed-off-by: Kees Cook <keescook@...omium.org>
---
Cc: Muhammad Usama Anjum <usama.anjum@...labora.com>
Cc: Eric Biederman <ebiederm@...ssion.com>
Cc: Shuah Khan <shuah@...nel.org>
Cc: "kernelci.org bot" <bot@...nelci.org>
Cc: Yang Yingliang <yangyingliang@...wei.com>
Cc: linux-mm@...ck.org
Cc: linux-kselftest@...r.kernel.org
---
 tools/testing/selftests/exec/Makefile | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/testing/selftests/exec/Makefile b/tools/testing/selftests/exec/Makefile
index a0b8688b0836..fb4472ddffd8 100644
--- a/tools/testing/selftests/exec/Makefile
+++ b/tools/testing/selftests/exec/Makefile
@@ -19,8 +19,8 @@ include ../lib.mk
 
 $(OUTPUT)/subdir:
 	mkdir -p $@
-$(OUTPUT)/script:
-	echo '#!/bin/sh' > $@
+$(OUTPUT)/script: Makefile
+	echo '#!/bin/bash' > $@
 	echo 'exit $$*' >> $@
 	chmod +x $@
 $(OUTPUT)/execveat.symlink: $(OUTPUT)/execveat
-- 
2.34.1