diff options
author | mm <mm@FreeBSD.org> | 2016-12-08 01:06:09 +0000 |
---|---|---|
committer | mm <mm@FreeBSD.org> | 2016-12-08 01:06:09 +0000 |
commit | d03230857f04c5f5b2ec57cdb334c51ac5794ef0 (patch) | |
tree | ef8072187c41280043c46b5843ffe851649ec92c /contrib/libarchive | |
parent | 6a7e18ff00902471666a295326db834bf51d175a (diff) | |
download | FreeBSD-src-d03230857f04c5f5b2ec57cdb334c51ac5794ef0.zip FreeBSD-src-d03230857f04c5f5b2ec57cdb334c51ac5794ef0.tar.gz |
Partial MFC r309300:
Apply fix for libarchive issue #821:
"tar -P" cannot extract hardlinks through symlinks
PR: 213255
Reported by: Tijl Coosemans <tilj@FreeBSD.org>
Diffstat (limited to 'contrib/libarchive')
-rw-r--r-- | contrib/libarchive/libarchive/archive_write_disk_posix.c | 268 | ||||
-rw-r--r-- | contrib/libarchive/tar/test/test_symlink_dir.c | 18 |
2 files changed, 192 insertions, 94 deletions
diff --git a/contrib/libarchive/libarchive/archive_write_disk_posix.c b/contrib/libarchive/libarchive/archive_write_disk_posix.c index 96c75dc..f094027 100644 --- a/contrib/libarchive/libarchive/archive_write_disk_posix.c +++ b/contrib/libarchive/libarchive/archive_write_disk_posix.c @@ -336,14 +336,19 @@ struct archive_write_disk { #define HFS_BLOCKS(s) ((s) >> 12) -static int check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error_string, int flags); +static void fsobj_error(int *, struct archive_string *, int, const char *, + const char *); +static int check_symlinks_fsobj(char *, int *, struct archive_string *, + int); static int check_symlinks(struct archive_write_disk *); static int create_filesystem_object(struct archive_write_disk *); -static struct fixup_entry *current_fixup(struct archive_write_disk *, const char *pathname); +static struct fixup_entry *current_fixup(struct archive_write_disk *, + const char *pathname); #if defined(HAVE_FCHDIR) && defined(PATH_MAX) static void edit_deep_directories(struct archive_write_disk *ad); #endif -static int cleanup_pathname_fsobj(char *path, int *error_number, struct archive_string *error_string, int flags); +static int cleanup_pathname_fsobj(char *, int *, struct archive_string *, + int); static int cleanup_pathname(struct archive_write_disk *); static int create_dir(struct archive_write_disk *, char *); static int create_parent_dir(struct archive_write_disk *, char *); @@ -374,11 +379,14 @@ static struct archive_vtable *archive_write_disk_vtable(void); static int _archive_write_disk_close(struct archive *); static int _archive_write_disk_free(struct archive *); -static int _archive_write_disk_header(struct archive *, struct archive_entry *); +static int _archive_write_disk_header(struct archive *, + struct archive_entry *); static int64_t _archive_write_disk_filter_bytes(struct archive *, int); static int _archive_write_disk_finish_entry(struct archive *); -static ssize_t _archive_write_disk_data(struct archive *, const void *, size_t); -static ssize_t _archive_write_disk_data_block(struct archive *, const void *, size_t, int64_t); +static ssize_t _archive_write_disk_data(struct archive *, const void *, + size_t); +static ssize_t _archive_write_disk_data_block(struct archive *, const void *, + size_t, int64_t); static int lazy_stat(struct archive_write_disk *a) @@ -649,7 +657,8 @@ _archive_write_disk_header(struct archive *_a, struct archive_entry *entry) if (a->restore_pwd >= 0) { r = fchdir(a->restore_pwd); if (r != 0) { - archive_set_error(&a->archive, errno, "chdir() failure"); + archive_set_error(&a->archive, errno, + "chdir() failure"); ret = ARCHIVE_FATAL; } close(a->restore_pwd); @@ -697,7 +706,8 @@ _archive_write_disk_header(struct archive *_a, struct archive_entry *entry) } if (archive_entry_birthtime_is_set(entry)) { fe->birthtime = archive_entry_birthtime(entry); - fe->birthtime_nanos = archive_entry_birthtime_nsec(entry); + fe->birthtime_nanos = archive_entry_birthtime_nsec( + entry); } else { /* If birthtime is unset, use mtime. */ fe->birthtime = fe->mtime; @@ -723,7 +733,8 @@ _archive_write_disk_header(struct archive *_a, struct archive_entry *entry) return (ARCHIVE_FATAL); fe->mac_metadata = malloc(metadata_size); if (fe->mac_metadata != NULL) { - memcpy(fe->mac_metadata, metadata, metadata_size); + memcpy(fe->mac_metadata, metadata, + metadata_size); fe->mac_metadata_size = metadata_size; fe->fixup |= TODO_MAC_METADATA; } @@ -1480,7 +1491,8 @@ _archive_write_disk_data_block(struct archive *_a, return (r); if ((size_t)r < size) { archive_set_error(&a->archive, 0, - "Too much data: Truncating file at %ju bytes", (uintmax_t)a->filesize); + "Too much data: Truncating file at %ju bytes", + (uintmax_t)a->filesize); return (ARCHIVE_WARN); } #if ARCHIVE_VERSION_NUMBER < 3999000 @@ -2005,8 +2017,9 @@ restore_entry(struct archive_write_disk *a) if (en) { /* Everything failed; give up here. */ - archive_set_error(&a->archive, en, "Can't create '%s'", - a->name); + if ((&a->archive)->error == NULL) + archive_set_error(&a->archive, en, "Can't create '%s'", + a->name); return (ARCHIVE_FAILED); } @@ -2043,19 +2056,32 @@ create_filesystem_object(struct archive_write_disk *a) if (linkname_copy == NULL) { return (EPERM); } - /* TODO: consider using the cleaned-up path as the link target? */ - r = cleanup_pathname_fsobj(linkname_copy, &error_number, &error_string, a->flags); + /* + * TODO: consider using the cleaned-up path as the link + * target? + */ + r = cleanup_pathname_fsobj(linkname_copy, &error_number, + &error_string, a->flags); if (r != ARCHIVE_OK) { - archive_set_error(&a->archive, error_number, "%s", error_string.s); + archive_set_error(&a->archive, error_number, "%s", + error_string.s); free(linkname_copy); - /* EPERM is more appropriate than error_number for our callers */ + /* + * EPERM is more appropriate than error_number for our + * callers + */ return (EPERM); } - r = check_symlinks_fsobj(linkname_copy, &error_number, &error_string, a->flags); + r = check_symlinks_fsobj(linkname_copy, &error_number, + &error_string, a->flags); if (r != ARCHIVE_OK) { - archive_set_error(&a->archive, error_number, "%s", error_string.s); + archive_set_error(&a->archive, error_number, "%s", + error_string.s); free(linkname_copy); - /* EPERM is more appropriate than error_number for our callers */ + /* + * EPERM is more appropriate than error_number for our + * callers + */ return (EPERM); } free(linkname_copy); @@ -2076,8 +2102,8 @@ create_filesystem_object(struct archive_write_disk *a) a->todo = 0; a->deferred = 0; } else if (r == 0 && a->filesize > 0) { - a->fd = open(a->name, - O_WRONLY | O_TRUNC | O_BINARY | O_CLOEXEC | O_NOFOLLOW); + a->fd = open(a->name, O_WRONLY | O_TRUNC | O_BINARY + | O_CLOEXEC | O_NOFOLLOW); __archive_ensure_cloexec_flag(a->fd); if (a->fd < 0) r = errno; @@ -2388,6 +2414,17 @@ current_fixup(struct archive_write_disk *a, const char *pathname) return (a->current_fixup); } +/* Error helper for new *_fsobj functions */ +static void +fsobj_error(int *a_eno, struct archive_string *a_estr, + int err, const char *errstr, const char *path) +{ + if (a_eno) + *a_eno = err; + if (a_estr) + archive_string_sprintf(a_estr, errstr, path); +} + /* * TODO: Someday, integrate this with the deep dir support; they both * scan the path and both can be optimized by comparing against other @@ -2400,7 +2437,8 @@ current_fixup(struct archive_write_disk *a, const char *pathname) * ARCHIVE_OK if there are none, otherwise puts an error in errmsg. */ static int -check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error_string, int flags) +check_symlinks_fsobj(char *path, int *a_eno, struct archive_string *a_estr, + int flags) { #if !defined(HAVE_LSTAT) /* Platform doesn't have lstat, so we can't look for symlinks. */ @@ -2433,7 +2471,8 @@ check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error * - if it's a directory and it's not the last chunk, cd into it * As we go: * head points to the current (relative) path - * tail points to the temporary \0 terminating the segment we're currently examining + * tail points to the temporary \0 terminating the segment we're + * currently examining * c holds what used to be in *tail * last is 1 if this is the last tail */ @@ -2455,7 +2494,9 @@ check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error * Exiting the loop with break is okay; continue is not. */ while (!last) { - /* Skip the separator we just consumed, plus any adjacent ones */ + /* + * Skip the separator we just consumed, plus any adjacent ones + */ while (*tail == '/') ++tail; /* Skip the next path element. */ @@ -2474,19 +2515,20 @@ check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error if (errno == ENOENT) { break; } else { - /* Treat any other error as fatal - best to be paranoid here - * Note: This effectively disables deep directory - * support when security checks are enabled. - * Otherwise, very long pathnames that trigger - * an error here could evade the sandbox. - * TODO: We could do better, but it would probably - * require merging the symlink checks with the - * deep-directory editing. */ - if (error_number) *error_number = errno; - if (error_string) - archive_string_sprintf(error_string, - "Could not stat %s", - path); + /* + * Treat any other error as fatal - best to be + * paranoid here. + * Note: This effectively disables deep + * directory support when security checks are + * enabled. Otherwise, very long pathnames that + * trigger an error here could evade the + * sandbox. + * TODO: We could do better, but it would + * probably require merging the symlink checks + * with the deep-directory editing. + */ + fsobj_error(a_eno, a_estr, errno, + "Could not stat %s", path); res = ARCHIVE_FAILED; break; } @@ -2494,11 +2536,8 @@ check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error if (!last) { if (chdir(head) != 0) { tail[0] = c; - if (error_number) *error_number = errno; - if (error_string) - archive_string_sprintf(error_string, - "Could not chdir %s", - path); + fsobj_error(a_eno, a_estr, errno, + "Could not chdir %s", path); res = (ARCHIVE_FATAL); break; } @@ -2514,11 +2553,9 @@ check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error */ if (unlink(head)) { tail[0] = c; - if (error_number) *error_number = errno; - if (error_string) - archive_string_sprintf(error_string, - "Could not remove symlink %s", - path); + fsobj_error(a_eno, a_estr, errno, + "Could not remove symlink %s", + path); res = ARCHIVE_FAILED; break; } @@ -2529,13 +2566,14 @@ check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error * symlink with another symlink. */ tail[0] = c; - /* FIXME: not sure how important this is to restore + /* + * FIXME: not sure how important this is to + * restore + */ + /* if (!S_ISLNK(path)) { - if (error_number) *error_number = 0; - if (error_string) - archive_string_sprintf(error_string, - "Removing symlink %s", - path); + fsobj_error(a_eno, a_estr, 0, + "Removing symlink %s", path); } */ /* Symlink gone. No more problem! */ @@ -2545,22 +2583,60 @@ check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error /* User asked us to remove problems. */ if (unlink(head) != 0) { tail[0] = c; - if (error_number) *error_number = 0; - if (error_string) - archive_string_sprintf(error_string, - "Cannot remove intervening symlink %s", - path); + fsobj_error(a_eno, a_estr, 0, + "Cannot remove intervening " + "symlink %s", path); res = ARCHIVE_FAILED; break; } tail[0] = c; + } else if ((flags & + ARCHIVE_EXTRACT_SECURE_SYMLINKS) == 0) { + /* + * We are not the last element and we want to + * follow symlinks if they are a directory. + * + * This is needed to extract hardlinks over + * symlinks. + */ + r = stat(head, &st); + if (r != 0) { + tail[0] = c; + if (errno == ENOENT) { + break; + } else { + fsobj_error(a_eno, a_estr, + errno, + "Could not stat %s", path); + res = (ARCHIVE_FAILED); + break; + } + } else if (S_ISDIR(st.st_mode)) { + if (chdir(head) != 0) { + tail[0] = c; + fsobj_error(a_eno, a_estr, + errno, + "Could not chdir %s", path); + res = (ARCHIVE_FATAL); + break; + } + /* + * Our view is now from inside + * this dir: + */ + head = tail + 1; + } else { + tail[0] = c; + fsobj_error(a_eno, a_estr, 0, + "Cannot extract through " + "symlink %s", path); + res = ARCHIVE_FAILED; + break; + } } else { tail[0] = c; - if (error_number) *error_number = 0; - if (error_string) - archive_string_sprintf(error_string, - "Cannot extract through symlink %s", - path); + fsobj_error(a_eno, a_estr, 0, + "Cannot extract through symlink %s", path); res = ARCHIVE_FAILED; break; } @@ -2577,10 +2653,8 @@ check_symlinks_fsobj(char *path, int *error_number, struct archive_string *error if (restore_pwd >= 0) { r = fchdir(restore_pwd); if (r != 0) { - if(error_number) *error_number = errno; - if(error_string) - archive_string_sprintf(error_string, - "chdir() failure"); + fsobj_error(a_eno, a_estr, errno, + "chdir() failure", ""); } close(restore_pwd); restore_pwd = -1; @@ -2605,9 +2679,11 @@ check_symlinks(struct archive_write_disk *a) int error_number; int rc; archive_string_init(&error_string); - rc = check_symlinks_fsobj(a->name, &error_number, &error_string, a->flags); + rc = check_symlinks_fsobj(a->name, &error_number, &error_string, + a->flags); if (rc != ARCHIVE_OK) { - archive_set_error(&a->archive, error_number, "%s", error_string.s); + archive_set_error(&a->archive, error_number, "%s", + error_string.s); } archive_string_free(&error_string); a->pst = NULL; /* to be safe */ @@ -2688,17 +2764,16 @@ cleanup_pathname_win(struct archive_write_disk *a) * is set) if the path is absolute. */ static int -cleanup_pathname_fsobj(char *path, int *error_number, struct archive_string *error_string, int flags) +cleanup_pathname_fsobj(char *path, int *a_eno, struct archive_string *a_estr, + int flags) { char *dest, *src; char separator = '\0'; dest = src = path; if (*src == '\0') { - if (error_number) *error_number = ARCHIVE_ERRNO_MISC; - if (error_string) - archive_string_sprintf(error_string, - "Invalid empty pathname"); + fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, + "Invalid empty ", "pathname"); return (ARCHIVE_FAILED); } @@ -2708,10 +2783,8 @@ cleanup_pathname_fsobj(char *path, int *error_number, struct archive_string *err /* Skip leading '/'. */ if (*src == '/') { if (flags & ARCHIVE_EXTRACT_SECURE_NOABSOLUTEPATHS) { - if (error_number) *error_number = ARCHIVE_ERRNO_MISC; - if (error_string) - archive_string_sprintf(error_string, - "Path is absolute"); + fsobj_error(a_eno, a_estr, ARCHIVE_ERRNO_MISC, + "Path is ", "absolute"); return (ARCHIVE_FAILED); } @@ -2738,11 +2811,11 @@ cleanup_pathname_fsobj(char *path, int *error_number, struct archive_string *err } else if (src[1] == '.') { if (src[2] == '/' || src[2] == '\0') { /* Conditionally warn about '..' */ - if (flags & ARCHIVE_EXTRACT_SECURE_NODOTDOT) { - if (error_number) *error_number = ARCHIVE_ERRNO_MISC; - if (error_string) - archive_string_sprintf(error_string, - "Path contains '..'"); + if (flags + & ARCHIVE_EXTRACT_SECURE_NODOTDOT) { + fsobj_error(a_eno, a_estr, + ARCHIVE_ERRNO_MISC, + "Path contains ", "'..'"); return (ARCHIVE_FAILED); } } @@ -2795,9 +2868,11 @@ cleanup_pathname(struct archive_write_disk *a) int error_number; int rc; archive_string_init(&error_string); - rc = cleanup_pathname_fsobj(a->name, &error_number, &error_string, a->flags); + rc = cleanup_pathname_fsobj(a->name, &error_number, &error_string, + a->flags); if (rc != ARCHIVE_OK) { - archive_set_error(&a->archive, error_number, "%s", error_string.s); + archive_set_error(&a->archive, error_number, "%s", + error_string.s); } archive_string_free(&error_string); return rc; @@ -2881,7 +2956,8 @@ create_dir(struct archive_write_disk *a, char *path) } } else if (errno != ENOENT && errno != ENOTDIR) { /* Stat failed? */ - archive_set_error(&a->archive, errno, "Can't test directory '%s'", path); + archive_set_error(&a->archive, errno, + "Can't test directory '%s'", path); return (ARCHIVE_FAILED); } else if (slash != NULL) { *slash = '\0'; @@ -3406,7 +3482,8 @@ clear_nochange_fflags(struct archive_write_disk *a) nochange_flags |= EXT2_IMMUTABLE_FL; #endif - return (set_fflags_platform(a, a->fd, a->name, mode, 0, nochange_flags)); + return (set_fflags_platform(a, a->fd, a->name, mode, 0, + nochange_flags)); } @@ -3931,7 +4008,8 @@ set_xattrs(struct archive_write_disk *a) if (errno == ENOTSUP || errno == ENOSYS) { if (!warning_done) { warning_done = 1; - archive_set_error(&a->archive, errno, + archive_set_error(&a->archive, + errno, "Cannot restore extended " "attributes on this file " "system"); @@ -3942,7 +4020,8 @@ set_xattrs(struct archive_write_disk *a) ret = ARCHIVE_WARN; } } else { - archive_set_error(&a->archive, ARCHIVE_ERRNO_FILE_FORMAT, + archive_set_error(&a->archive, + ARCHIVE_ERRNO_FILE_FORMAT, "Invalid extended attribute encountered"); ret = ARCHIVE_WARN; } @@ -3986,19 +4065,22 @@ set_xattrs(struct archive_write_disk *a) errno = 0; #if HAVE_EXTATTR_SET_FD if (a->fd >= 0) - e = extattr_set_fd(a->fd, namespace, name, value, size); + e = extattr_set_fd(a->fd, namespace, name, + value, size); else #endif /* TODO: should we use extattr_set_link() instead? */ { - e = extattr_set_file(archive_entry_pathname(entry), - namespace, name, value, size); + e = extattr_set_file( + archive_entry_pathname(entry), namespace, + name, value, size); } if (e != (ssize_t)size) { if (errno == ENOTSUP || errno == ENOSYS) { if (!warning_done) { warning_done = 1; - archive_set_error(&a->archive, errno, + archive_set_error(&a->archive, + errno, "Cannot restore extended " "attributes on this file " "system"); diff --git a/contrib/libarchive/tar/test/test_symlink_dir.c b/contrib/libarchive/tar/test/test_symlink_dir.c index ba643c2..beadb3c 100644 --- a/contrib/libarchive/tar/test/test_symlink_dir.c +++ b/contrib/libarchive/tar/test/test_symlink_dir.c @@ -47,11 +47,18 @@ DEFINE_TEST(test_symlink_dir) assertMakeDir("source/dir3", 0755); assertMakeDir("source/dir3/d3", 0755); assertMakeFile("source/dir3/f3", 0755, "abcde"); + assertMakeDir("source/dir4", 0755); + assertMakeFile("source/dir4/file3", 0755, "abcdef"); + assertMakeHardlink("source/dir4/file4", "source/dir4/file3"); assertEqualInt(0, systemf("%s -cf test.tar -C source dir dir2 dir3 file file2", testprog)); + /* Second archive with hardlinks */ + assertEqualInt(0, + systemf("%s -cf test2.tar -C source dir4", testprog)); + /* * Extract with -x and without -P. */ @@ -118,9 +125,15 @@ DEFINE_TEST(test_symlink_dir) assertMakeSymlink("dest2/file2", "real_file2"); assertEqualInt(0, systemf("%s -xPf test.tar -C dest2", testprog)); - /* dest2/dir symlink should be followed */ + /* "dir4" is a symlink to existing "real_dir" */ + if (canSymlink()) + assertMakeSymlink("dest2/dir4", "real_dir"); + assertEqualInt(0, systemf("%s -xPf test2.tar -C dest2", testprog)); + + /* dest2/dir and dest2/dir4 symlinks should be followed */ if (canSymlink()) { assertIsSymlink("dest2/dir", "real_dir"); + assertIsSymlink("dest2/dir4", "real_dir"); assertIsDir("dest2/real_dir", -1); } @@ -141,4 +154,7 @@ DEFINE_TEST(test_symlink_dir) /* dest2/file2 symlink should be removed */ failure("Symlink to non-existing file should be removed"); assertIsReg("dest2/file2", -1); + + /* dest2/dir4/file3 and dest2/dir4/file4 should be hard links */ + assertIsHardlink("dest2/dir4/file3", "dest2/dir4/file4"); } |