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| author | Denys Vlasenko | 2018-02-20 15:57:45 +0100 |
|---|---|---|
| committer | Denys Vlasenko | 2018-02-20 16:06:53 +0100 |
| commit | a84db18fc71d09e801df0ebca048d82e90b32c6a (patch) | |
| tree | 1eda8cd659f78406f1b9f86d5e0b5757af20bad9 /include | |
| parent | 95121d98e6da12599246d8e25c3f300e422a06fb (diff) | |
| download | busybox-a84db18fc71d09e801df0ebca048d82e90b32c6a.zip busybox-a84db18fc71d09e801df0ebca048d82e90b32c6a.tar.gz | |
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')
| -rw-r--r-- | include/bb_archive.h | 23 |
1 files changed, 14 insertions, 9 deletions
diff --git a/include/bb_archive.h b/include/bb_archive.h index 8ed20d7..a5c61e9 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; |