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io: Fix destructive nature of tst-fchmod-errors

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We must not change the permissions of /dev/null if running
as root.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>
This commit is contained in:
Florian Weimer 2024-08-30 22:07:12 +02:00
parent 424d97be50
commit 3844cdc330
1 changed files with 10 additions and 3 deletions
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13
io/tst-fchmod-errors.c
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@ -18,8 +18,10 @@
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <support/check.h>
#include <support/xunistd.h>
#include <unistd.h>
static int
do_test (void)
@ -27,9 +29,14 @@ do_test (void)
{
/* Permissions on /dev/null (the opened descriptor) cannot be changed. */
int fd = xopen ("/dev/null", O_RDWR, 0);
errno = 0;
TEST_COMPARE (fchmod (fd, 0), -1);
TEST_COMPARE (errno, EPERM);
if (getuid () == 0)
puts ("info: /dev/null fchmod test skipped because of root privileges");
else
{
errno = 0;
TEST_COMPARE (fchmod (fd, 0), -1);
TEST_COMPARE (errno, EPERM);
}
xclose (fd);
/* Now testing an invalid file descriptor. */