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authorGravatar Denys Vlasenko <vda.linux@googlemail.com>2018-02-20 15:57:45 +0100
committerGravatar Denys Vlasenko <vda.linux@googlemail.com>2018-03-10 19:41:54 +0100
commit37277a23fe48b13313f5d96084d890ed21d5fd8b (patch)
treee8a7964ad8fb1ba25aee2c54d434c2239b93faa2 /archival/libarchive/data_extract_all.c
parente3821088af5fb663be756c3330b52d1b48ad699e (diff)
downloadbusybox-37277a23fe48b13313f5d96084d890ed21d5fd8b.tar.gz
busybox-37277a23fe48b13313f5d96084d890ed21d5fd8b.tar.bz2
tar,unzip: postpone creation of symlinks with "suspicious" targets
This mostly reverts commit bc9bbeb2b81001e8731cd2ae501c8fccc8d87cc7 "libarchive: do not extract unsafe symlinks unless $EXTRACT_UNSAFE_SYMLINKS=1" Users report that it is somewhat too restrictive. See https://bugs.busybox.net/show_bug.cgi?id=8411 In particular, this interferes with unpacking of busybox-based filesystems with links like "sbin/applet" -> "../bin/busybox". The change is made smaller by deleting ARCHIVE_EXTRACT_QUIET flag - it is unused since 2010, and removing conditionals on it allows commonalizing some error message codes. function old new delta create_or_remember_symlink - 94 +94 create_symlinks_from_list - 64 +64 tar_main 1002 1006 +4 unzip_main 2732 2724 -8 data_extract_all 984 891 -93 unsafe_symlink_target 147 - -147 ------------------------------------------------------------------------------ (add/remove: 2/1 grow/shrink: 1/2 up/down: 162/-248) Total: -86 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/libarchive/data_extract_all.c')
-rw-r--r--archival/libarchive/data_extract_all.c28
1 files changed, 7 insertions, 21 deletions
diff --git a/archival/libarchive/data_extract_all.c b/archival/libarchive/data_extract_all.c
index d3a6df5e8..8fa69ffaf 100644
--- a/archival/libarchive/data_extract_all.c
+++ b/archival/libarchive/data_extract_all.c
@@ -107,9 +107,7 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
}
}
else if (existing_sb.st_mtime >= file_header->mtime) {
- if (!(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
- && !S_ISDIR(file_header->mode)
- ) {
+ if (!S_ISDIR(file_header->mode)) {
bb_error_msg("%s not created: newer or "
"same age file exists", dst_name);
}
@@ -125,7 +123,7 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
/* Handle hard links separately */
if (hard_link) {
res = link(hard_link, dst_name);
- if (res != 0 && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)) {
+ if (res != 0) {
/* shared message */
bb_perror_msg("can't create %slink '%s' to '%s'",
"hard", dst_name, hard_link
@@ -165,10 +163,9 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
}
case S_IFDIR:
res = mkdir(dst_name, file_header->mode);
- if ((res == -1)
+ if ((res != 0)
&& (errno != EISDIR) /* btw, Linux doesn't return this */
&& (errno != EEXIST)
- && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
) {
bb_perror_msg("can't make dir %s", dst_name);
}
@@ -198,27 +195,16 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
*
* Untarring bug.tar would otherwise place evil.py in '/tmp'.
*/
- if (!unsafe_symlink_target(file_header->link_target)) {
- res = symlink(file_header->link_target, dst_name);
- if (res != 0
- && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
- ) {
- /* shared message */
- bb_perror_msg("can't create %slink '%s' to '%s'",
- "sym",
- dst_name, file_header->link_target
- );
- }
- }
+ create_or_remember_symlink(&archive_handle->symlink_placeholders,
+ file_header->link_target,
+ dst_name);
break;
case S_IFSOCK:
case S_IFBLK:
case S_IFCHR:
case S_IFIFO:
res = mknod(dst_name, file_header->mode, file_header->device);
- if ((res == -1)
- && !(archive_handle->ah_flags & ARCHIVE_EXTRACT_QUIET)
- ) {
+ if (res != 0) {
bb_perror_msg("can't create node %s", dst_name);
}
break;