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tests: add a simple test that checks what fexecve_or_execve does

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This can be easily used to show that the issue described in
ceedbf8185fc7593366679f02d31da63af8c4bd1 is still reproduced:

$ strace -e execveat build/test-execve /bin/grep Name /proc/self/status
execveat(3, "", ["/bin/grep", "Name", "/proc/self/status"], NULL, AT_EMPTY_PATH) = 0
Name:	3
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2022-07-22 11:04:01 +02:00 committed by Yu Watanabe
parent 704116c976
commit 35a926777e
2 changed files with 42 additions and 0 deletions
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2
src/test/meson.build
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@ -232,6 +232,8 @@ tests += [
[files('test-exec-util.c')],
[files('test-execve.c')],
[files('test-hexdecoct.c')],
[files('test-alloc-util.c')],

40
src/test/test-execve.c Normal file
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@ -0,0 +1,40 @@
/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "exec-util.h"
#include "fd-util.h"
#include "log.h"
#include "main-func.h"
#include "strv.h"
#include "tests.h"
/* This program can be used to call programs through fexecve / execveat(…, "", …, AT_EMPTY_PATH),
* when compiled with -Dfexecve=true, and the fallback paths, when -Dfexecve=false.
*
* Example:
* $ strace -e execveat build/test-execve /bin/grep Name /proc/self/status
* execveat(3, "", ["/bin/grep", "Name", "/proc/self/status"], NULL, AT_EMPTY_PATH) = 0
* Name: 3
*
* FIXME: use the new kernel api to set COMM properly when the kernel makes that available.
* C.f. ceedbf8185fc7593366679f02d31da63af8c4bd1.
*/
static int run(int argc, char **argv) {
_cleanup_close_ int fd;
char **args = strv_skip(argv, 1);
int r;
test_setup_logging(LOG_DEBUG);
args = !strv_isempty(args) ? args : STRV_MAKE("/bin/true");
fd = open(args[0], O_RDONLY | O_CLOEXEC);
if (fd < 0)
return log_error_errno(errno, "open(%s) failed: %m", args[0]);
r = fexecve_or_execve(fd, args[0], args, NULL);
assert_se(r < 0);
return log_error_errno(r, "fexecve_or_execve(%s) failed: %m", args[0]);
}
DEFINE_MAIN_FUNCTION(run);