diff options
Diffstat (limited to 'elf/chroot_canon.c')
| -rw-r--r-- | elf/chroot_canon.c | 177 |
1 files changed, 0 insertions, 177 deletions
diff --git a/elf/chroot_canon.c b/elf/chroot_canon.c deleted file mode 100644 index 78cd6f4a5e..0000000000 --- a/elf/chroot_canon.c +++ /dev/null @@ -1,177 +0,0 @@ -/* Return the canonical absolute name of a given file inside chroot. - Copyright (C) 1996-2017 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published - by the Free Software Foundation; version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - You should have received a copy of the GNU General Public License - along with this program; if not, see <http://www.gnu.org/licenses/>. */ - -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <limits.h> -#include <sys/stat.h> -#include <errno.h> -#include <stddef.h> -#include <stdint.h> - -#include <eloop-threshold.h> -#include <ldconfig.h> - -#ifndef PATH_MAX -#define PATH_MAX 1024 -#endif - -/* Return the canonical absolute name of file NAME as if chroot(CHROOT) was - done first. A canonical name does not contain any `.', `..' components - nor any repeated path separators ('/') or symlinks. All path components - must exist and NAME must be absolute filename. The result is malloc'd. - The returned name includes the CHROOT prefix. */ - -char * -chroot_canon (const char *chroot, const char *name) -{ - char *rpath; - char *dest; - char *extra_buf = NULL; - char *rpath_root; - const char *start; - const char *end; - const char *rpath_limit; - int num_links = 0; - size_t chroot_len = strlen (chroot); - - if (chroot_len < 1) - { - __set_errno (EINVAL); - return NULL; - } - - rpath = xmalloc (chroot_len + PATH_MAX); - - rpath_limit = rpath + chroot_len + PATH_MAX; - - rpath_root = (char *) mempcpy (rpath, chroot, chroot_len) - 1; - if (*rpath_root != '/') - *++rpath_root = '/'; - dest = rpath_root + 1; - - for (start = end = name; *start; start = end) - { - struct stat64 st; - - /* Skip sequence of multiple path-separators. */ - while (*start == '/') - ++start; - - /* Find end of path component. */ - for (end = start; *end && *end != '/'; ++end) - /* Nothing. */; - - if (end - start == 0) - break; - else if (end - start == 1 && start[0] == '.') - /* nothing */; - else if (end - start == 2 && start[0] == '.' && start[1] == '.') - { - /* Back up to previous component, ignore if at root already. */ - if (dest > rpath_root + 1) - while ((--dest)[-1] != '/'); - } - else - { - size_t new_size; - - if (dest[-1] != '/') - *dest++ = '/'; - - if (dest + (end - start) >= rpath_limit) - { - ptrdiff_t dest_offset = dest - rpath; - char *new_rpath; - - new_size = rpath_limit - rpath; - if (end - start + 1 > PATH_MAX) - new_size += end - start + 1; - else - new_size += PATH_MAX; - new_rpath = (char *) xrealloc (rpath, new_size); - rpath = new_rpath; - rpath_limit = rpath + new_size; - - dest = rpath + dest_offset; - } - - dest = mempcpy (dest, start, end - start); - *dest = '\0'; - - if (lstat64 (rpath, &st) < 0) - { - if (*end == '\0') - goto done; - goto error; - } - - if (S_ISLNK (st.st_mode)) - { - char *buf = alloca (PATH_MAX); - size_t len; - - if (++num_links > __eloop_threshold ()) - { - __set_errno (ELOOP); - goto error; - } - - ssize_t n = readlink (rpath, buf, PATH_MAX - 1); - if (n < 0) - { - if (*end == '\0') - goto done; - goto error; - } - buf[n] = '\0'; - - if (!extra_buf) - extra_buf = alloca (PATH_MAX); - - len = strlen (end); - if (len >= PATH_MAX - n) - { - __set_errno (ENAMETOOLONG); - goto error; - } - - /* Careful here, end may be a pointer into extra_buf... */ - memmove (&extra_buf[n], end, len + 1); - name = end = memcpy (extra_buf, buf, n); - - if (buf[0] == '/') - dest = rpath_root + 1; /* It's an absolute symlink */ - else - /* Back up to previous component, ignore if at root already: */ - if (dest > rpath_root + 1) - while ((--dest)[-1] != '/'); - } - } - } - done: - if (dest > rpath_root + 1 && dest[-1] == '/') - --dest; - *dest = '\0'; - - return rpath; - - error: - free (rpath); - return NULL; -} |