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selftests: safesetid: Check the return value of setuid/setgid

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Check the return value of setuid() and setgid().
This fixes the following warnings and improves test result.

safesetid-test.c: In function ‘main’:
safesetid-test.c:294:2: warning: ignoring return value of ‘setuid’, declared with attribute warn_unused_result [-Wunused-result]
  setuid(NO_POLICY_USER);
  ^~~~~~~~~~~~~~~~~~~~~~
safesetid-test.c:295:2: warning: ignoring return value of ‘setgid’, declared with attribute warn_unused_result [-Wunused-result]
  setgid(NO_POLICY_USER);
  ^~~~~~~~~~~~~~~~~~~~~~
safesetid-test.c:309:2: warning: ignoring return value of ‘setuid’, declared with attribute warn_unused_result [-Wunused-result]
  setuid(RESTRICTED_PARENT);
  ^~~~~~~~~~~~~~~~~~~~~~~~~
safesetid-test.c:310:2: warning: ignoring return value of ‘setgid’, declared with attribute warn_unused_result [-Wunused-result]
  setgid(RESTRICTED_PARENT);
  ^~~~~~~~~~~~~~~~~~~~~~~~~
safesetid-test.c: In function ‘test_setuid’:
safesetid-test.c:216:3: warning: ignoring return value of ‘setuid’, declared with attribute warn_unused_result [-Wunused-result]
   setuid(child_uid);
   ^~~~~~~~~~~~~~~~~

Fixes: c67e8ec03f ("LSM: SafeSetID: add selftest")
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Masami Hiramatsu 2019-12-05 21:21:07 +09:00 committed by Shuah Khan
parent be12252212
commit 295c4e21cf
1 changed files with 10 additions and 5 deletions
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15
tools/testing/selftests/safesetid/safesetid-test.c
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@ -213,7 +213,8 @@ static void test_setuid(uid_t child_uid, bool expect_success)
}
if (cpid == 0) { /* Code executed by child */
setuid(child_uid);
if (setuid(child_uid) < 0)
exit(EXIT_FAILURE);
if (getuid() == child_uid)
exit(EXIT_SUCCESS);
else
@ -291,8 +292,10 @@ int main(int argc, char **argv)
// First test to make sure we can write userns mappings from a user
// that doesn't have any restrictions (as long as it has CAP_SETUID);
setuid(NO_POLICY_USER);
setgid(NO_POLICY_USER);
if (setuid(NO_POLICY_USER) < 0)
die("Error with set uid(%d)\n", NO_POLICY_USER);
if (setgid(NO_POLICY_USER) < 0)
die("Error with set gid(%d)\n", NO_POLICY_USER);
// Take away all but setid caps
drop_caps(true);
@ -306,8 +309,10 @@ int main(int argc, char **argv)
die("test_userns failed when it should work\n");
}
setuid(RESTRICTED_PARENT);
setgid(RESTRICTED_PARENT);
if (setuid(RESTRICTED_PARENT) < 0)
die("Error with set uid(%d)\n", RESTRICTED_PARENT);
if (setgid(RESTRICTED_PARENT) < 0)
die("Error with set gid(%d)\n", RESTRICTED_PARENT);
test_setuid(ROOT_USER, false);
test_setuid(ALLOWED_CHILD1, true);