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Fix error reporting (false negatives) in SGID tests 

And simplify the interface of support_capture_subprogram_self_sgid.

Use the existing framework for temporary directories (now with
mode 0700) and directory/file deletion.  Handle all execution
errors within support_capture_subprogram_self_sgid.  In particular,
this includes test failures because the invoked program did not
exit with exit status zero.  Existing tests that expect exit
status 42 are adjusted to use zero instead.

In addition, fix callers not to call exit (0) with test failures
pending (which may mask them, especially when running with --direct).

Fixes commit 35fc356fa3
("elf: Fix subprocess status handling for tst-dlopen-sgid (bug 32987)").

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 3a3fb2ed83)
This commit is contained in:
Florian Weimer 2025-05-22 14:36:37 +02:00
parent 23a02e382c
commit dbc83657e2
6 changed files with 36 additions and 132 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
elf/tst-dlopen-sgid.c
View File

@ -70,13 +70,7 @@ do_test (void)
free (libdir);
int status = support_capture_subprogram_self_sgid (magic_argument);
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
return EXIT_UNSUPPORTED;
if (!WIFEXITED (status))
FAIL_EXIT1 ("Unexpected exit status %d from child process\n", status);
support_capture_subprogram_self_sgid (magic_argument);
return 0;
}

18
elf/tst-env-setuid-tunables.c
View File

@ -105,10 +105,7 @@ do_test (int argc, char **argv)
if (ret != 0)
exit (1);
/* Special return code to make sure that the child executed all the way
through. */
exit (42);
return 0;
}
else
{
@ -127,18 +124,7 @@ do_test (int argc, char **argv)
continue;
}
int status = support_capture_subprogram_self_sgid (buf);
/* Bail out early if unsupported. */
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
return EXIT_UNSUPPORTED;
if (WEXITSTATUS (status) != 42)
{
printf (" [%d] child failed with status %d\n", i,
WEXITSTATUS (status));
support_record_failure ();
}
support_capture_subprogram_self_sgid (buf);
}
return 0;
}

17
elf/tst-env-setuid.c
View File

@ -147,10 +147,7 @@ do_test (int argc, char **argv)
if (ret != 0)
exit (1);
/* Special return code to make sure that the child executed all the way
through. */
exit (42);
return 0;
}
else
{
@ -174,17 +171,7 @@ do_test (int argc, char **argv)
free (profilepath);
}
int status = support_capture_subprogram_self_sgid (SETGID_CHILD);
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
exit (EXIT_UNSUPPORTED);
if (WEXITSTATUS (status) != 42)
{
printf (" child failed with status %d\n",
WEXITSTATUS (status));
support_record_failure ();
}
support_capture_subprogram_self_sgid (SETGID_CHILD);
return 0;
}

9
stdlib/tst-secure-getenv.c
View File

@ -57,13 +57,7 @@ do_test (void)
exit (1);
}
int status = support_capture_subprogram_self_sgid (MAGIC_ARGUMENT);
if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
return EXIT_UNSUPPORTED;
if (!WIFEXITED (status))
FAIL_EXIT1 ("Unexpected exit status %d from child process\n", status);
support_capture_subprogram_self_sgid (MAGIC_ARGUMENT);
return 0;
}
@ -82,6 +76,7 @@ alternative_main (int argc, char **argv)
if (secure_getenv ("PATH") != NULL)
FAIL_EXIT (4, "PATH variable not filtered out\n");
support_record_failure_barrier ();
exit (EXIT_SUCCESS);
}
}

10
support/capture_subprocess.h
View File

@ -42,10 +42,12 @@ struct support_capture_subprocess support_capture_subprocess
struct support_capture_subprocess support_capture_subprogram
(const char *file, char *const argv[], char *const envp[]);
/* Copy the running program into a setgid binary and run it with CHILD_ID
argument. If execution is successful, return the exit status of the child
program, otherwise return a non-zero failure exit code. */
int support_capture_subprogram_self_sgid (const char *child_id);
/* Copy the running program into a setgid binary and run it with
CHILD_ID argument. If the program exits with a non-zero status,
exit with that exit status (or status 1 if the program did not exit
normally). If the test cannot be performed, exit with
EXIT_UNSUPPORTED. */
void support_capture_subprogram_self_sgid (const char *child_id);
/* Deallocate the subprocess data captured by
support_capture_subprocess. */

106
support/support_capture_subprocess.c
View File

@ -31,6 +31,7 @@
#include <support/xsocket.h>
#include <support/xspawn.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
static void
@ -113,105 +114,44 @@ support_capture_subprogram (const char *file, char *const argv[],
/* Copies the executable into a restricted directory, so that we can
safely make it SGID with the TARGET group ID. Then runs the
executable. */
static int
static void
copy_and_spawn_sgid (const char *child_id, gid_t gid)
{
char *dirname = xasprintf ("%s/tst-tunables-setuid.%jd",
test_dir, (intmax_t) getpid ());
char *dirname = support_create_temp_directory ("tst-glibc-sgid-");
char *execname = xasprintf ("%s/bin", dirname);
int infd = -1;
int outfd = -1;
int ret = 1, status = 1;
add_temp_file (execname);
TEST_VERIFY (mkdir (dirname, 0700) == 0);
if (support_record_failure_is_failed ())
goto err;
infd = open ("/proc/self/exe", O_RDONLY);
if (infd < 0)
if (access ("/proc/self/exe", R_OK) != 0)
FAIL_UNSUPPORTED ("unsupported: Cannot read binary from procfs\n");
outfd = open (execname, O_WRONLY | O_CREAT | O_EXCL, 0700);
TEST_VERIFY (outfd >= 0);
if (support_record_failure_is_failed ())
goto err;
support_copy_file ("/proc/self/exe", execname);
char buf[4096];
for (;;)
{
ssize_t rdcount = read (infd, buf, sizeof (buf));
TEST_VERIFY (rdcount >= 0);
if (support_record_failure_is_failed ())
goto err;
if (rdcount == 0)
break;
char *p = buf;
char *end = buf + rdcount;
while (p != end)
{
ssize_t wrcount = write (outfd, buf, end - p);
if (wrcount == 0)
errno = ENOSPC;
TEST_VERIFY (wrcount > 0);
if (support_record_failure_is_failed ())
goto err;
p += wrcount;
}
}
if (chown (execname, getuid (), gid) != 0)
FAIL_UNSUPPORTED ("cannot change group of \"%s\" to %jd: %m",
execname, (intmax_t) gid);
bool chowned = false;
TEST_VERIFY ((chowned = fchown (outfd, getuid (), gid) == 0)
|| errno == EPERM);
if (support_record_failure_is_failed ())
goto err;
else if (!chowned)
{
ret = 77;
goto err;
}
TEST_VERIFY (fchmod (outfd, 02750) == 0);
if (support_record_failure_is_failed ())
goto err;
TEST_VERIFY (close (outfd) == 0);
if (support_record_failure_is_failed ())
goto err;
TEST_VERIFY (close (infd) == 0);
if (support_record_failure_is_failed ())
goto err;
if (chmod (execname, 02750) != 0)
FAIL_UNSUPPORTED ("cannot make \"%s\" SGID: %m ", execname);
/* We have the binary, now spawn the subprocess. Avoid using
support_subprogram because we only want the program exit status, not the
contents. */
ret = 0;
infd = outfd = -1;
char * const args[] = {execname, (char *) child_id, NULL};
int status = support_subprogram_wait (args[0], args);
status = support_subprogram_wait (args[0], args);
free (execname);
free (dirname);
err:
if (outfd >= 0)
close (outfd);
if (infd >= 0)
close (infd);
if (execname != NULL)
if (WIFEXITED (status))
{
unlink (execname);
free (execname);
if (WEXITSTATUS (status) == 0)
return;
else
exit (WEXITSTATUS (status));
}
if (dirname != NULL)
{
rmdir (dirname);
free (dirname);
}
if (ret == 77)
FAIL_UNSUPPORTED ("Failed to make sgid executable for test\n");
if (ret != 0)
FAIL_EXIT1 ("Failed to make sgid executable for test\n");
return status;
else
FAIL_EXIT1 ("subprogram failed with status %d", status);
}
/* Returns true if a group with NAME has been found, and writes its
@ -253,7 +193,7 @@ find_sgid_group (gid_t *target, const char *name)
return ok;
}
int
void
support_capture_subprogram_self_sgid (const char *child_id)
{
const int count = 64;
@ -288,7 +228,7 @@ support_capture_subprogram_self_sgid (const char *child_id)
(intmax_t) getuid ());
}
return copy_and_spawn_sgid (child_id, target);
copy_and_spawn_sgid (child_id, target);
}
void