GitHub's actions/checkout@v6 is documented to need 'contents: read' but
it works without it too, probably because the repository is public.
Reported-by: GitHub user Alb3e3
Fixes: https://github.com/tukaani-project/xz/pull/230
There no point to try decoding further when the Index is clearly not
from a valid .xz file.
This also limits what index_decoder_memconfig() can return as the
memory usage. Very huge values aren't possible anymore. This affects
file_info_decoder_memconfig() in file_info.c where very huge values
aren't expected and could result in an integer overflow when not much
memory has actually been allocated. Now the overflow can only happen if
one manages to successfully allocate and fill a few exabytes of memory.
Reported-by: GitHub user jmestwa-coder
Fixes: https://github.com/tukaani-project/xz/pull/226
In two tables, the column headings are now narrower and
MANWIDTH=80 man --warnings po4a/man/ar/xz.1 > /dev/null
no longer warns.
Thanks-to: Zayed Al-Saidi <zayed.alsaidi@gmail.com>
Fixes: https://github.com/tukaani-project/xz/pull/220
This is required to handle strings that may contain invalid multibyte
sequences. For example, on GNU/Linux and FreeBSD 14 with UTF-8 locale:
$ printf "\201'A\n" | sed s/./x/ | hexdump -C
00000000 81 78 41 0a |.xA.|
That is, the first byte remains untouched and the ' is replaced with x.
This kind of string would result in inbalanced quotes in xzdiff. In the
C locale it works safely:
$ printf "\201'A\n" | LC_ALL=C sed s/./x/ | hexdump -C
00000000 78 27 41 0a |x'A.|
Similar changes were made in xzgrep in 2022 (see the commits 69d1b3fc2967
and 6a4a4a7d2667). Somehow xzdiff was forgotten even though this issue
was fixed in zdiff in gzip in 2022.
Co-authored-by: rootvector2 <dxbnaveed.k@gmail.com>
Fixes: https://github.com/tukaani-project/xz/pull/228
If --files=FILELIST or --files0=FILELIST was specified via an enrivonment
variable, it worked if there were no errors when reading from the file
FILELIST. However, if an error occurred when reading from FILELIST,
there was a use-after-free bug when printing the error message because
the memory containing the string "FILELIST" had been freed.
printf foo.xz > filelist.txt
XZ_OPT=--files=filelist.txt xz -l
Because filelist.txt doesn't end in a newline, the file list is seen as
invalid/truncated, resulting in an error message like this:
xz: ????????.txt: Unexpected end of input when reading filenames
The question marks are because the garbage string is masked using
tuklib_mask_nonprint(). After this commit, it works:
xz: filelist.txt: Unexpected end of input when reading filenames
Co-authored-by: Lasse Collin <lasse.collin@tukaani.org>
Fixes: https://github.com/tukaani-project/xz/pull/223
For example, the following would run the "id" command:
xzgrep "--a='" "--b=;id;'" "pattern" foo.xz
The bug was inherited from gzip's zgrep. It was reported to bug-gzip by
Leenear. It was fixed in gzip in the commit cd74dc30f8cc by Paul Eggert.
Link: https://lists.gnu.org/archive/html/bug-gzip/2026-04/msg00032.html
This way the newer features are available on new enough kernels
even if the package is built against old <linux/landlock.h>.
Landlock ABI versions 4 and 6 would require an extended
struct landlock_ruleset_attr. No fallback is provided (or planned)
for those features.
Suggested-by: Omkhar Arasaratnam
The extra indentation makes the tables stand out from the text, and
in the English man page it works well. However, some translations
have strings that require more space, and the table might become
too wide. In some translations this has been solved by splitting
the translated string on two lines, for example, Romanian translation
of "4096-byte alignment is best".
On Debian 13 with groff 1.23.0, the "man" command shows a few warnings:
$ LANGUAGE=it MANWIDTH=80 man --warnings xz > /dev/null
<standard input>:477: warning: table wider than line length minus indentation
<standard input>:545: warning: table wider than line length minus indentation
<standard input>:1182: warning: table wider than line length minus indentation
German man page shows those warnings too. On Arch with groff 1.24.1,
there are fewer warnings because the newer groff indents less, and
fewer tables reach or exceed the right margin. Thus, some safety margin
is good to keep the output neat with different man page formatters.
It feels silly to reduce the indentation on the English man page which
has plenty of safety margin, but it's simpler than trying to do it
only for the translated man pages. This doesn't affect readability;
it's just cosmetic.
I tried using .IP instead of .RS + .PP for the tables, but on Solaris 10
it results in an extra empty line before the table. It makes some
difference on AIX 7.3 too. With groff, both are fine. Stick to
.RS + .PP + .TS ... .TE + .RE for slightly better portability.
Co-authored-by: Otto Kekäläinen <otto@debian.org>
Partially-fixes: https://github.com/tukaani-project/xz/pull/220
Testing with this:
cd po4a
./update-po
groff -K utf8 -man -t -ww -rCHECKSTYLE=3 -z man/sr/*.1
The output included this:
an.tmac:man/sr/xz.1:751: style: 1 leading space(s) on input line
The actual reason seemed to be an unwanted newline (likely a typo).
Testing with this:
cd po4a
./update-po
groff -K utf8 -man -t -ww -rCHECKSTYLE=3 -z man/de/*.1
The output included this:
an.tmac:man/de/xz.1:524: style: 1 leading space(s) on input line
Testing with this:
cd po4a
./update-po
groff -K utf8 -man -t -ww -z man/ko/*.1
It produced warnings:
troff:man/ko/xz.1:1405: warning: color 'i' not defined
troff:man/ko/xzdec.1:17: warning: cannot select font '\'
troff:man/ko/xzdec.1:19: warning: cannot select font '\'
Testing with this:
cd po4a
./update-po
groff -K utf8 -man -t -ww -z man/fr/xz.1
It produced a warning:
troff:man/fr/xz.1:516: warning: color 'i' not defined
The backslash for non-breaking space was misplaced:
Old: 8 \\Mio,
New: 8\\ Mio,
Don't use "" as an argument to .IP because it makes mandoc insert
an unwanted extra empty line. With the xz man page, this change makes
no difference in plain text output with GNU groff or on AIX or
Solaris 10. The list in the xzgrep man page has a different indentation
now because previously it had two arguments (.IP "" 4), but that's OK.
I don't remember why '.IP' was changed to '.IP ""' in cec0ddc8ec4c.
Maybe it made a difference on some proprietary UNIX over 15 years ago
or maybe it was just a misunderstanding.
Non-ASCII chars in tables (.TS ... .TE) result in warnings:
man --warnings po4a/man/uk/xz.1 > /dev/null
troff:<standard input>:464: warning: special character 'u0411\[tbl' not defined
troff:<standard input>:1157: warning: special character 'u044\[tbl' not defined
troff:<standard input>:1682: warning: special character 'u0434\[tbl' not defined
po4a generates groff Unicode escapes like '\u0435' followed immediately
by '[' in table contexts, causing groff to interpret the full string
'u0435[tbl' as a single special character name. Fix this by inserting
a dummy character (\&) after every Unicode escape so that the bracket
is treated as literal text instead of part of the character name.
Co-authored-by: Otto Kekäläinen <otto@debian.org>
Partially-fixes: https://github.com/tukaani-project/xz/pull/220
While most ARM64 and LoongArch processors support unaligned access,
the code wouldn't have worked on strict-align processors.
Use byte-by-byte method if the input buffer is at most 7 bytes. This
way the code works on strict-align processors too. It might not be
the very best method for tiny buffers, but it shouldn't matter in
practice (the simple implementation for big buffers isn't amazing
either because it cannot execute more than one CRC32 instruction
at a time on superscalar processors).
Reported-by: Guanni Qu
Fixes: 0ed893668554 ("liblzma: ARM64 CRC32: Align the buffer faster")
Fixes: 7baf6835cfbf ("liblzma: Speed up CRC32 calculation on 64-bit LoongArch")
lzma_stream_buffer_decode() would often fail with LZMA_BUF_ERROR
when it should have failed with LZMA_DATA_ERROR.
In debug builds this also resulted in an assertion failure.
In the _buffer_decode() functions, LZMA_BUF_ERROR is only used when
the output buffer is too small. Truncated input is LZMA_DATA_ERROR.
Reported-by: Guanni Qu
Reported-by: Omkhar Arasaratnam
Fixes: c81f13ff2927 ("Added lzma_stream_buffer_decode() and made minor cleanups.")
If --verbose was used when stderr isn't a terminal, the filename
contained a non-printable character, and an error occurred,
a use-after-free occurred when printing the error message.
The bug exists in versions 5.7.1alpha to 5.8.3.
Reported-by: Omkhar Arasaratnam
Fixes: d22f96921fd2 ("xz: Use tuklib_mbstr_nonprint")
If lzma_index_decoder() was used to decode an Index that contained no
Records, the resulting lzma_index had an invalid internal "prealloc"
value. If lzma_index_append() was called on this lzma_index, too
little memory would be allocated and a buffer overflow would occur.
While this combination of the API functions is meant to work, in the
real-world apps this call sequence is rare or might not exist at all.
This bug is older than xz 5.0.0, so all stable releases are affected.
Reported-by: GitHub user christos-spearbit
When using clang-cl, avoid the long list of warning options used with
GCC and Clang because, for MSVC compatibility, clang-cl's -Wall behaves
like -Weverything.
Add warning options for MSVC. Use them with clang-cl too.
This requires a filename (or something that pretends to be a filename)
of at least 2 GiB on a 32-bit platform, and that realloc() to
SIZE_MAX / 2 + 1 bytes has succeeded.
Fixes: https://github.com/tukaani-project/xz/pull/218
The __builtin_assume_aligned was applied to the wrong argument which
made aligned writes worse on strict-align archs.
Aligned writes aren't used in liblzma, so this bug didn't matter in
this package; tuklib_integer.h is meant to be usable elsewhere too.
