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Subject[PATCH] selftests/exec: Verify execve of non-regular files fail
Add a named pipe as an exec target to make sure that non-regular
files are rejected by execve() with EACCES. This can help verify
commit 73601ea5b7b1 ("fs/open.c: allow opening only regular files
during execve()").

Signed-off-by: Kees Cook <keescook@chromium.org>
---
tools/testing/selftests/exec/.gitignore | 1 +
tools/testing/selftests/exec/Makefile | 2 +-
tools/testing/selftests/exec/execveat.c | 8 ++++++++
3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/tools/testing/selftests/exec/.gitignore b/tools/testing/selftests/exec/.gitignore
index c078ece12ff0..94b02a18f230 100644
--- a/tools/testing/selftests/exec/.gitignore
+++ b/tools/testing/selftests/exec/.gitignore
@@ -9,3 +9,4 @@ execveat.ephemeral
execveat.denatured
/recursion-depth
xxxxxxxx*
+pipe
diff --git a/tools/testing/selftests/exec/Makefile b/tools/testing/selftests/exec/Makefile
index 33339e31e365..cfafa1f8a2fa 100644
--- a/tools/testing/selftests/exec/Makefile
+++ b/tools/testing/selftests/exec/Makefile
@@ -4,7 +4,7 @@ CFLAGS += -Wno-nonnull
CFLAGS += -D_GNU_SOURCE

TEST_GEN_PROGS := execveat
-TEST_GEN_FILES := execveat.symlink execveat.denatured script subdir
+TEST_GEN_FILES := execveat.symlink execveat.denatured script subdir pipe
# Makefile is a run-time dependency, since it's accessed by the execveat test
TEST_FILES := Makefile

diff --git a/tools/testing/selftests/exec/execveat.c b/tools/testing/selftests/exec/execveat.c
index cbb6efbdb786..67bf7254a48f 100644
--- a/tools/testing/selftests/exec/execveat.c
+++ b/tools/testing/selftests/exec/execveat.c
@@ -5,7 +5,9 @@
* Selftests for execveat(2).
*/

+#ifndef _GNU_SOURCE
#define _GNU_SOURCE /* to get O_PATH, AT_EMPTY_PATH */
+#endif
#include <sys/sendfile.h>
#include <sys/stat.h>
#include <sys/syscall.h>
@@ -311,6 +313,10 @@ static int run_tests(void)
fail += check_execveat_fail(AT_FDCWD, fullname_symlink,
AT_SYMLINK_NOFOLLOW, ELOOP);

+ /* Non-regular file failure */
+ fail += check_execveat_fail(dot_dfd, "pipe", 0, EACCES);
+ unlink("pipe");
+
/* Shell script wrapping executable file: */
/* dfd + path */
fail += check_execveat(subdir_dfd, "../script", 0);
@@ -384,6 +390,8 @@ static void prerequisites(void)
fd = open("subdir.ephemeral/script", O_RDWR|O_CREAT|O_TRUNC, 0755);
write(fd, script, strlen(script));
close(fd);
+
+ mkfifo("pipe", 0755);
}

int main(int argc, char **argv)
--
2.20.1

--
Kees Cook

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