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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 /include/bb_archive.h
parente3821088af5fb663be756c3330b52d1b48ad699e (diff)
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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 'include/bb_archive.h')
-rw-r--r--include/bb_archive.h23
1 files changed, 14 insertions, 9 deletions
diff --git a/include/bb_archive.h b/include/bb_archive.h
index d3a02cf18..05dba700a 100644
--- a/include/bb_archive.h
+++ b/include/bb_archive.h
@@ -64,6 +64,9 @@ typedef struct archive_handle_t {
/* Currently processed file's header */
file_header_t *file_header;
+ /* List of symlink placeholders */
+ llist_t *symlink_placeholders;
+
/* Process the header component, e.g. tar -t */
void FAST_FUNC (*action_header)(const file_header_t *);
@@ -119,15 +122,14 @@ typedef struct archive_handle_t {
#define ARCHIVE_RESTORE_DATE (1 << 0)
#define ARCHIVE_CREATE_LEADING_DIRS (1 << 1)
#define ARCHIVE_UNLINK_OLD (1 << 2)
-#define ARCHIVE_EXTRACT_QUIET (1 << 3)
-#define ARCHIVE_EXTRACT_NEWER (1 << 4)
-#define ARCHIVE_DONT_RESTORE_OWNER (1 << 5)
-#define ARCHIVE_DONT_RESTORE_PERM (1 << 6)
-#define ARCHIVE_NUMERIC_OWNER (1 << 7)
-#define ARCHIVE_O_TRUNC (1 << 8)
-#define ARCHIVE_REMEMBER_NAMES (1 << 9)
+#define ARCHIVE_EXTRACT_NEWER (1 << 3)
+#define ARCHIVE_DONT_RESTORE_OWNER (1 << 4)
+#define ARCHIVE_DONT_RESTORE_PERM (1 << 5)
+#define ARCHIVE_NUMERIC_OWNER (1 << 6)
+#define ARCHIVE_O_TRUNC (1 << 7)
+#define ARCHIVE_REMEMBER_NAMES (1 << 8)
#if ENABLE_RPM
-#define ARCHIVE_REPLACE_VIA_RENAME (1 << 10)
+#define ARCHIVE_REPLACE_VIA_RENAME (1 << 9)
#endif
@@ -197,7 +199,10 @@ void seek_by_jump(int fd, off_t amount) FAST_FUNC;
void seek_by_read(int fd, off_t amount) FAST_FUNC;
const char *strip_unsafe_prefix(const char *str) FAST_FUNC;
-int unsafe_symlink_target(const char *target) FAST_FUNC;
+void create_or_remember_symlink(llist_t **symlink_placeholders,
+ const char *target,
+ const char *linkname) FAST_FUNC;
+void create_symlinks_from_list(llist_t *list) FAST_FUNC;
void data_align(archive_handle_t *archive_handle, unsigned boundary) FAST_FUNC;
const llist_t *find_list_entry(const llist_t *list, const char *filename) FAST_FUNC;