From 61016db15b8e20f371352db6a75b044ec3183fe7 Mon Sep 17 00:00:00 2001 From: Kees Cook Date: Sun, 17 May 2020 21:47:43 -0700 Subject: 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 Signed-off-by: Shuah Khan --- 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(-) (limited to 'tools/testing/selftests/exec') 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 #include #include @@ -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) -- cgit v1.2.3