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https://sourceware.org/git/glibc.git
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bb5bb87959
Use the support_capture_subprogram_self_sgid to spawn an sgid child.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit ca33528106)
128 lines
2.9 KiB
C
128 lines
2.9 KiB
C
/* Copyright (C) 2012-2020 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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/* Verify that tunables correctly filter out unsafe environment variables like
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MALLOC_CHECK_ and MALLOC_MMAP_THRESHOLD_ but also retain
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MALLOC_MMAP_THRESHOLD_ in an unprivileged child. */
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#include <errno.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <string.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/test-driver.h>
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#include <support/capture_subprocess.h>
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static char SETGID_CHILD[] = "setgid-child";
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#ifndef test_child
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static int
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test_child (void)
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{
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if (getenv ("MALLOC_CHECK_") != NULL)
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{
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printf ("MALLOC_CHECK_ is still set\n");
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return 1;
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}
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if (getenv ("MALLOC_MMAP_THRESHOLD_") == NULL)
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{
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printf ("MALLOC_MMAP_THRESHOLD_ lost\n");
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return 1;
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}
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if (getenv ("LD_HWCAP_MASK") != NULL)
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{
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printf ("LD_HWCAP_MASK still set\n");
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return 1;
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}
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return 0;
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}
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#endif
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#ifndef test_parent
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static int
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test_parent (void)
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{
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if (getenv ("MALLOC_CHECK_") == NULL)
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{
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printf ("MALLOC_CHECK_ lost\n");
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return 1;
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}
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if (getenv ("MALLOC_MMAP_THRESHOLD_") == NULL)
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{
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printf ("MALLOC_MMAP_THRESHOLD_ lost\n");
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return 1;
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}
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if (getenv ("LD_HWCAP_MASK") == NULL)
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{
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printf ("LD_HWCAP_MASK lost\n");
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return 1;
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}
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return 0;
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}
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#endif
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static int
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do_test (int argc, char **argv)
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{
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/* Setgid child process. */
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if (argc == 2 && strcmp (argv[1], SETGID_CHILD) == 0)
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{
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if (getgid () == getegid ())
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/* This can happen if the file system is mounted nosuid. */
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FAIL_UNSUPPORTED ("SGID failed: GID and EGID match (%jd)\n",
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(intmax_t) getgid ());
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int ret = test_child ();
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if (ret != 0)
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exit (1);
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exit (EXIT_SUCCESS);
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}
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else
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{
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if (test_parent () != 0)
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exit (1);
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int status = support_capture_subprogram_self_sgid (SETGID_CHILD);
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if (WEXITSTATUS (status) == EXIT_UNSUPPORTED)
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return EXIT_UNSUPPORTED;
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if (!WIFEXITED (status))
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FAIL_EXIT1 ("Unexpected exit status %d from child process\n", status);
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return 0;
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}
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}
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#define TEST_FUNCTION_ARGV do_test
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#include <support/test-driver.c>
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