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c22553effb
Otherwise, another user might recreate these files after the first deletion. Particularly with temporary directories, this could result in the removal of unintended files through symbol link attacks.
262 lines
8.7 KiB
C
262 lines
8.7 KiB
C
/* Tests for spawn.
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Copyright (C) 2000-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@cygnus.com>, 2000.
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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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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <error.h>
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#include <fcntl.h>
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#include <spawn.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <wait.h>
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#include <sys/param.h>
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/* Nonzero if the program gets called via `exec'. */
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static int restart;
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#define CMDLINE_OPTIONS \
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{ "restart", no_argument, &restart, 1 },
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/* Prototype for our test function. */
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extern void do_prepare (int argc, char *argv[]);
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extern int do_test (int argc, char *argv[]);
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/* We have a preparation function. */
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#define PREPARE do_prepare
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#include "../test-skeleton.c"
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/* Name of the temporary files. */
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static char *name1;
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static char *name2;
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static char *name3;
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/* Descriptors for the temporary files. */
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static int temp_fd1 = -1;
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static int temp_fd2 = -1;
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static int temp_fd3 = -1;
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/* The contents of our files. */
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static const char fd1string[] = "This file should get closed";
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static const char fd2string[] = "This file should stay opened";
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static const char fd3string[] = "This file will be opened";
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/* We have a preparation function. */
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void
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do_prepare (int argc, char *argv[])
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{
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/* We must not open any files in the restart case. */
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if (restart)
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return;
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temp_fd1 = create_temp_file ("spawn", &name1);
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temp_fd2 = create_temp_file ("spawn", &name2);
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temp_fd3 = create_temp_file ("spawn", &name3);
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if (temp_fd1 < 0 || temp_fd2 < 0 || temp_fd3 < 0)
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exit (1);
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}
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static int
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handle_restart (const char *fd1s, const char *fd2s, const char *fd3s,
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const char *fd4s, const char *name)
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{
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char buf[100];
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int fd1;
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int fd2;
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int fd3;
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int fd4;
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/* First get the descriptors. */
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fd1 = atol (fd1s);
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fd2 = atol (fd2s);
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fd3 = atol (fd3s);
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fd4 = atol (fd4s);
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/* Sanity check. */
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if (fd1 == fd2)
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error (EXIT_FAILURE, 0, "value of fd1 and fd2 is the same");
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if (fd1 == fd3)
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error (EXIT_FAILURE, 0, "value of fd1 and fd3 is the same");
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if (fd1 == fd4)
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error (EXIT_FAILURE, 0, "value of fd1 and fd4 is the same");
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if (fd2 == fd3)
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error (EXIT_FAILURE, 0, "value of fd2 and fd3 is the same");
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if (fd2 == fd4)
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error (EXIT_FAILURE, 0, "value of fd2 and fd4 is the same");
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if (fd3 == fd4)
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error (EXIT_FAILURE, 0, "value of fd3 and fd4 is the same");
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/* First the easy part: read from the file descriptor which is
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supposed to be open. */
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if (lseek (fd2, 0, SEEK_CUR) != strlen (fd2string))
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error (EXIT_FAILURE, errno, "file 2 not in right position");
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/* The duped descriptor must have the same position. */
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if (lseek (fd4, 0, SEEK_CUR) != strlen (fd2string))
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error (EXIT_FAILURE, errno, "file 4 not in right position");
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if (lseek (fd2, 0, SEEK_SET) != 0)
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error (EXIT_FAILURE, 0, "cannot reset position in file 2");
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if (lseek (fd4, 0, SEEK_CUR) != 0)
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error (EXIT_FAILURE, errno, "file 4 not set back, too");
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if (read (fd2, buf, sizeof buf) != strlen (fd2string))
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error (EXIT_FAILURE, 0, "cannot read file 2");
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if (memcmp (fd2string, buf, strlen (fd2string)) != 0)
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error (EXIT_FAILURE, 0, "file 2 does not match");
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/* Now read from the third file. */
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if (read (fd3, buf, sizeof buf) != strlen (fd3string))
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error (EXIT_FAILURE, 0, "cannot read file 3");
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if (memcmp (fd3string, buf, strlen (fd3string)) != 0)
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error (EXIT_FAILURE, 0, "file 3 does not match");
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/* Try to write to the file. This should not be allowed. */
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if (write (fd3, "boo!", 4) != -1 || errno != EBADF)
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error (EXIT_FAILURE, 0, "file 3 is writable");
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/* Now try to read the first file. First make sure it is not opened. */
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if (lseek (fd1, 0, SEEK_CUR) != (off_t) -1 || errno != EBADF)
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error (EXIT_FAILURE, 0, "file 1 (%d) is not closed", fd1);
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/* Now open the file and read it. */
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fd1 = open (name, O_RDONLY);
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if (fd1 == -1)
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error (EXIT_FAILURE, errno,
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"cannot open first file \"%s\" for verification", name);
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if (read (fd1, buf, sizeof buf) != strlen (fd1string))
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error (EXIT_FAILURE, errno, "cannot read file 1");
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if (memcmp (fd1string, buf, strlen (fd1string)) != 0)
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error (EXIT_FAILURE, 0, "file 1 does not match");
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return 0;
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}
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int
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do_test (int argc, char *argv[])
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{
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pid_t pid;
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int fd4;
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int status;
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posix_spawn_file_actions_t actions;
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char fd1name[18];
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char fd2name[18];
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char fd3name[18];
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char fd4name[18];
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char *name3_copy;
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char *spargv[12];
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int i;
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/* We must have
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- one or four parameters left if called initially
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+ path for ld.so optional
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+ "--library-path" optional
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+ the library path optional
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+ the application name
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- five parameters left if called through re-execution
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+ file descriptor number which is supposed to be closed
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+ the open file descriptor
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+ the newly opened file descriptor
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+ thhe duped second descriptor
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+ the name of the closed descriptor
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*/
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if (argc != (restart ? 6 : 2) && argc != (restart ? 6 : 5))
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error (EXIT_FAILURE, 0, "wrong number of arguments (%d)", argc);
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if (restart)
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return handle_restart (argv[1], argv[2], argv[3], argv[4], argv[5]);
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/* Prepare the test. We are creating two files: one which file descriptor
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will be marked with FD_CLOEXEC, another which is not. */
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/* Write something in the files. */
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if (write (temp_fd1, fd1string, strlen (fd1string)) != strlen (fd1string))
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error (EXIT_FAILURE, errno, "cannot write to first file");
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if (write (temp_fd2, fd2string, strlen (fd2string)) != strlen (fd2string))
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error (EXIT_FAILURE, errno, "cannot write to second file");
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if (write (temp_fd3, fd3string, strlen (fd3string)) != strlen (fd3string))
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error (EXIT_FAILURE, errno, "cannot write to third file");
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/* Close the third file. It'll be opened by `spawn'. */
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close (temp_fd3);
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/* Tell `spawn' what to do. */
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if (posix_spawn_file_actions_init (&actions) != 0)
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error (EXIT_FAILURE, errno, "posix_spawn_file_actions_init");
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/* Close `temp_fd1'. */
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if (posix_spawn_file_actions_addclose (&actions, temp_fd1) != 0)
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error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addclose");
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/* We want to open the third file. */
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name3_copy = strdup (name3);
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if (name3_copy == NULL)
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error (EXIT_FAILURE, errno, "strdup");
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if (posix_spawn_file_actions_addopen (&actions, temp_fd3, name3_copy,
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O_RDONLY, 0666) != 0)
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error (EXIT_FAILURE, errno, "posix_spawn_file_actions_addopen");
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/* Overwrite the name to check that a copy has been made. */
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memset (name3_copy, 'X', strlen (name3_copy));
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/* We dup the second descriptor. */
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fd4 = MAX (2, MAX (temp_fd1, MAX (temp_fd2, temp_fd3))) + 1;
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if (posix_spawn_file_actions_adddup2 (&actions, temp_fd2, fd4) != 0)
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error (EXIT_FAILURE, errno, "posix_spawn_file_actions_adddup2");
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/* Now spawn the process. */
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snprintf (fd1name, sizeof fd1name, "%d", temp_fd1);
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snprintf (fd2name, sizeof fd2name, "%d", temp_fd2);
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snprintf (fd3name, sizeof fd3name, "%d", temp_fd3);
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snprintf (fd4name, sizeof fd4name, "%d", fd4);
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for (i = 0; i < (argc == (restart ? 6 : 5) ? 4 : 1); i++)
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spargv[i] = argv[i + 1];
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spargv[i++] = (char *) "--direct";
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spargv[i++] = (char *) "--restart";
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spargv[i++] = fd1name;
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spargv[i++] = fd2name;
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spargv[i++] = fd3name;
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spargv[i++] = fd4name;
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spargv[i++] = name1;
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spargv[i] = NULL;
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if (posix_spawn (&pid, argv[1], &actions, NULL, spargv, environ) != 0)
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error (EXIT_FAILURE, errno, "posix_spawn");
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/* Same test but with a NULL pid argument. */
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if (posix_spawn (NULL, argv[1], &actions, NULL, spargv, environ) != 0)
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error (EXIT_FAILURE, errno, "posix_spawn");
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/* Cleanup. */
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if (posix_spawn_file_actions_destroy (&actions) != 0)
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error (EXIT_FAILURE, errno, "posix_spawn_file_actions_destroy");
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free (name3_copy);
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/* Wait for the child. */
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if (waitpid (pid, &status, 0) != pid)
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error (EXIT_FAILURE, errno, "wrong child");
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if (WTERMSIG (status) != 0)
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error (EXIT_FAILURE, 0, "Child terminated incorrectly");
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status = WEXITSTATUS (status);
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return status;
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}
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