emo/busybox
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

dpkg-deb: work around bogus error message when working with XZ compressed packages

Browse Source 
function                                             old     new   delta
unpack_xz_stream                                    2309    2317      +8
bb_full_fd_action                                    464     472      +8

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko
2019-10-11 14:11:44 +02:00
parent 7011eca83a
commit 42f454b13b
3 changed files with 28 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
archival/libarchive/decompress_unxz.c
View File

@@ -96,6 +96,24 @@ unpack_xz_stream(transformer_state_t *xstate)
*/
do {
if (membuf[iobuf.in_pos] != 0) {
/* There is more data, but is it XZ data?
* Example: dpkg-deb -f busybox_1.30.1-4_amd64.deb
* reads control.tar.xz "control" file
* inside the ar archive, but tar.xz
* extraction code reaches end of xz data,
* reached this code and reads the beginning
* of data.tar.xz's ar header, which isn't xz data,
* and prints "corrupted data".
* The correct solution is to not read
* past nested archive (to simulate EOF).
* This is a workaround:
*/
if (membuf[iobuf.in_pos] != 0xfd) {
/* It's definitely not a xz signature
* (which is 0xfd,"7zXZ",0x00).
*/
goto end;
}
xz_dec_reset(state);
goto do_run;
}
@@ -128,7 +146,7 @@ unpack_xz_stream(transformer_state_t *xstate)
break;
}
}
end:
xz_dec_end(state);
free(membuf);

2
archival/libarchive/unxz/xz_stream.h
View File

@@ -25,7 +25,7 @@
#define STREAM_HEADER_SIZE 12
#define HEADER_MAGIC "\3757zXZ"
#define HEADER_MAGIC "\375""7zXZ"
#define HEADER_MAGIC_SIZE 6
#define FOOTER_MAGIC "YZ"