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

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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
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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"

5
libbb/copyfd.c
View File

@ -18,7 +18,7 @@
* was seen to cause largish delays when user tries to ^C a file copy.
* Let's use a saner size.
* Note: needs to be >= max(CONFIG_FEATURE_COPYBUF_KB),
* or else "copy to eof" code will use neddlesly short reads.
* or else "copy to eof" code will use needlesly short reads.
*/
#define SENDFILE_BIGBUF (16*1024*1024)
@ -60,10 +60,13 @@ static off_t bb_full_fd_action(int src_fd, int dst_fd, off_t size)
ssize_t rd;
if (sendfile_sz) {
/* dst_fd == -1 is a fake, else... */
if (dst_fd >= 0) {
rd = sendfile(dst_fd, src_fd, NULL,
size > sendfile_sz ? sendfile_sz : size);
if (rd >= 0)
goto read_ok;
}
sendfile_sz = 0; /* do not try sendfile anymore */
}
#if CONFIG_FEATURE_COPYBUF_KB > 4