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| author | Denys Vlasenko | 2019-10-11 14:11:44 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2019-10-11 14:11:44 +0200 |
| commit | 42f454b13b8d972e85acd7f046065ec69af4d206 (patch) | |
| tree | 2cc09f3970a5115bee0fccda3c558a1e9211660f /archival | |
| parent | 7011eca83afc313098f9869eea36742d4506bc02 (diff) | |
| download | busybox-42f454b13b8d972e85acd7f046065ec69af4d206.zip busybox-42f454b13b8d972e85acd7f046065ec69af4d206.tar.gz | |
dpkg-deb: work around bogus error message when working with XZ compressed packages
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>
Diffstat (limited to 'archival')
| -rw-r--r-- | archival/libarchive/decompress_unxz.c | 20 | ||||
| -rw-r--r-- | archival/libarchive/unxz/xz_stream.h | 2 |
2 files changed, 20 insertions, 2 deletions
diff --git a/archival/libarchive/decompress_unxz.c b/archival/libarchive/decompress_unxz.c index f033413..3dd9bbf 100644 --- a/archival/libarchive/decompress_unxz.c +++ b/archival/libarchive/decompress_unxz.c @@ -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); diff --git a/archival/libarchive/unxz/xz_stream.h b/archival/libarchive/unxz/xz_stream.h index 66cb5a7..45056e4 100644 --- a/archival/libarchive/unxz/xz_stream.h +++ b/archival/libarchive/unxz/xz_stream.h @@ -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" |