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146 lines
3.9 KiB
C
146 lines
3.9 KiB
C
/* Copyright (C) 2014-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <pthread.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <sys/syscall.h>
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#include <unistd.h>
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/* Check that a partial setuid failure aborts the process. */
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static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t cond_send;
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static void (*func_sent) (void);
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static pthread_cond_t cond_recv;
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#define FAIL(fmt, ...) \
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do { printf ("FAIL: " fmt "\n", __VA_ARGS__); _exit (1); } while (0)
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static void *
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thread_func (void *ctx __attribute__ ((unused)))
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{
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int ret = pthread_mutex_lock (&mutex);
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if (ret != 0)
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FAIL ("pthread_mutex_lock (thread): %d", ret);
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while (true)
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{
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if (func_sent != NULL)
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{
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void (*func) (void) = func_sent;
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ret = pthread_mutex_unlock (&mutex);
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if (ret != 0)
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FAIL ("pthread_mutex_unlock (thread): %d", ret);
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func ();
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ret = pthread_mutex_lock (&mutex);
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if (ret != 0)
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FAIL ("pthread_mutex_lock (thread): %d", ret);
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func_sent = NULL;
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ret = pthread_cond_signal (&cond_recv);
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if (ret != 0)
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FAIL ("pthread_cond_signal (recv): %d", ret);
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}
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ret = pthread_cond_wait (&cond_send, &mutex);
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if (ret != 0)
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FAIL ("pthread_cond_wait (send): %d", ret);
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}
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return NULL;
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}
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static void
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run_on_thread (void (*func) (void))
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{
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int ret = pthread_mutex_lock (&mutex);
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if (ret != 0)
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FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
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func_sent = func;
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ret = pthread_mutex_unlock (&mutex);
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if (ret != 0)
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FAIL ("pthread_mutex_unlock (%s): %d", __func__, ret);
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ret = pthread_cond_signal (&cond_send);
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if (ret != 0)
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FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
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ret = pthread_mutex_lock (&mutex);
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if (ret != 0)
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FAIL ("pthread_mutex_lock (%s): %d", __func__, ret);
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while (func_sent != NULL)
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{
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ret = pthread_cond_wait (&cond_recv, &mutex);
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if (ret != 0)
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FAIL ("pthread_mutex_wait (%s): %d", __func__, ret);
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}
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ret = pthread_mutex_unlock (&mutex);
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if (ret != 0)
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FAIL ("pthread_mutex_unlock (%s): %d", __func__, ret);
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}
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static void
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change_thread_ids (void)
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{
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long ret = syscall (__NR_setresuid, 2001, 2002, 2003);
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if (ret != 0)
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FAIL ("setresuid (2001, 2002, 2003): %ld", ret);
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}
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static uid_t ruid, euid, suid;
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static void
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get_thread_ids (void)
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{
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if (getresuid (&ruid, &euid, &suid) < 0)
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FAIL ("getresuid: %m (%d)", errno);
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}
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static void
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abort_expected (int signal __attribute__ ((unused)))
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{
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_exit (0);
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}
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static int
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do_test (void)
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{
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pthread_t thread;
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int ret = pthread_create (&thread, NULL, thread_func, NULL);
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if (ret != 0)
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FAIL ("pthread_create: %d", ret);
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run_on_thread (change_thread_ids);
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signal (SIGABRT, &abort_expected);
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/* This should abort the process. */
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if (setresuid (1001, 1002, 1003) < 0)
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FAIL ("setresuid: %m (%d)", errno);
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signal (SIGABRT, SIG_DFL);
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/* If we get here, check that the kernel did the right thing. */
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run_on_thread (get_thread_ids);
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if (ruid != 1001 || euid != 1002 || suid != 1003)
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FAIL ("unexpected UIDs after setuid: %ld, %ld, %ld",
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(long) ruid, (long) euid, (long) suid);
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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