Commit Graph

298 Commits (fb9acedcadb0a05a60c5feeb36d9ec70e4e2bd77)

Author SHA1 Message Date
Tobias Stoeckmann fb9acedcad libpkgconf: dependency: fix out of boundary write
It is possible to trigger an out of boundary write in function
pkgconf_dependency_parse_str if a dependency line contains a very
long comparator. The comparator is stored in a temporary buffer which
has a size of PKGCONF_ITEM_SIZE.

The line which is parsed can be up to PKGCONF_BUFSIZE characters long,
which is larger than PKGCONF_ITEM_SIZE (although it depends on PATH_MAX).

Having a comparator which is longer than PKGCONF_ITEM_SIZE therefore
leads to an out of boundary write. Although it is undefined behaviour,
this can lead to an overridden compare variable, which in turn can lead
to an invalid instruction pointer, i.e. most likely a crash or code
execution (very unlikely).

Proof of concept:

$ echo "Requires: x " > poc.pc
$ dd if=/dev/zero bs=1 count=65535 | tr '\0' '<' >> poc.pc
$ pkgconf poc.pc

Eiter compile pkgconf with address sanitizer or run pkgconf multiple
times, eventually it might crash (assuming that ASLR is in place).

In order to fix this, I decided to use an end pointer to avoid OOB write.
Alternative would be to increase the buffer size, but I try to avoid that
since this would be additional ~60 KB stack space for a very unlikely
situation.
2020-05-26 14:03:55 -06:00
Ariadne Conill c613eb5cce libpkgconf: pkg: use a second pointer for demunging windows paths 2020-05-26 13:42:39 -06:00
Ariadne Conill e70b536ea3 libpkgconf: pkg: when generating a search path, use the correct path separator
Before, this could result in generated paths like C:\foo\pkgconfig/bar.pc on Windows.
2020-05-26 11:01:46 -06:00
Ariadne Conill 0253fddc1d libpkgconf: pkg: fix computation of pkgconf_pkg_t.id on Windows.
Windows allows both \ and / as valid path characters.  A computed path
such as C:\development\libfoo\pkgconfig/foo.pc will result in a computed
pkgconf_pkg_t.id of "pkgconfig/foo".

Accordingly, correct the path normalization for checking for / after
the \ path has been dealt with in all cases.
2020-05-26 07:41:16 -06:00
Tobias Stoeckmann 9e16d2709c libpkgconf: personality: fix out of boundary access
It is possible to set the instruction pointer to undefined values by
using an operator larger than ':' in ASCII.

Since the personality function array does not have 256 entries, an
invalid operator can overflow the array.

Proof of concept:

$ echo "a _ b" > poc
$ ln -s $(which pkgconf) poc-pkgconf
$ ./poc-pkgconf
2020-05-25 05:55:39 -06:00
Ariadne Conill dd57abfe9f pkgconf 1.7.0. 2020-05-24 14:55:02 -06:00
Ariadne Conill 4fb7683c3e add support for the PKGCONF_PKG_PKGF_DONT_MERGE_SPECIAL_FRAGMENTS flag used in build2. 2020-05-24 14:40:47 -06:00
Ben 011db1bb88 Do not complain about malformed whitespace from \n on Version line
Every version line has a newline at the end; the malformed whitespace checker
should just check for trailing spaces and tabs.

Resolves https://todo.sr.ht/~kaniini/pkgconf/15
2020-05-24 14:36:46 -06:00
Ariadne Conill 382a89c173 pkg: pkgconf_compare_version(): do not return levenshtein distance in strcmp() case 2020-05-24 14:18:16 -06:00
Tobias Stoeckmann 92745ad9cb libpkgconf: parser: fix out of boundary access
It is possible to trigger an out of boundary access with specially
crafted files. If a line consist of only a key and spaces, then
op will point to '\0'-ending of the buffer. Since p is iterated by
one byte right past this ending '\0', the next read access to p is
effectively out of bounds.

Theoretically this can also lead to out of boundary writes if spaces
are encountered.

Proof of concept (I recommend to compile with address sanitizer):

$ echo -n a > poc.pc
$ dd if=/dev/zero bs=1 count=65533 | tr '\0' ' ' >> poc.pc
$ pkgconf poc.pc
2020-05-24 14:10:18 -06:00
Tobias Stoeckmann bd4ed1ca02 libpkgconf: fileio: prevent buffer overflow.
pkgconf_fgetline is called with a user-defined buffer, its size, and
a FILE stream to read input from.

If the buffer is almost completely filled and the file stream contains
an escaped character, then it is possible to trigger an off-by-one
buffer overflow with a '\0' character.

Easiest example to trigger this:

char buf[2];
pkgconf_fgetline(buf, sizeof(buf), stdin);

Enter "\\" (two backslashes) and press enter. If the library and the
program are compiled with address sanitizer, you will see the program
crashing. Otherwise it depends on your architecture what happens.

Since nobody should be using a buffer of only size 1 or 2, keep enough
space for a possibly escaped character in while loop by subtracting one
more byte for this situation, not just for '\0'.
2020-05-24 14:09:44 -06:00
Ariadne Conill 48dc665ae3 personality: add support for WantDefaultStatic setting 2019-10-19 00:56:17 -05:00
Ariadne Conill 2adafc2729 libpkgconf: personality: return the default personality if loading a personality file failed 2019-08-23 12:48:11 -05:00
Ariadne Conill 19aa93e371 prepare for pkgconf 2.0 development 2019-08-04 15:54:24 -05:00
Ariadne Conill c862e030cf pkgconf 1.6.3. 2019-07-12 06:53:37 -05:00
Ariadne Conill c10f69994b libpkgconf: pkg: generate diagnostic for and trim malformed versions 2019-07-12 06:35:48 -05:00
Ariadne Conill 7a395932f2 drop CMake support 2019-07-12 05:45:16 -05:00
Ariadne Conill c816ce6969 pkgconf 1.6.2. (closes #38, #40, #41) 2019-07-11 03:50:00 -05:00
Ariadne Conill 7e0b0fadab libpkgconf: path: fix memory leak when deduping paths (closes #39) 2019-07-11 03:43:18 -05:00
Alexander Tsoy db9c1e96a1
fix the order of header includes
config.h should be included before stdinc.h, otherwise large file
support is not enabled.

Downstream bug: https://bugs.gentoo.org/687548
2019-06-08 04:55:52 +03:00
William Pitcock ebfcaf5081 normalize include guards. closes #33 2019-05-25 16:00:09 -05:00
William Pitcock 2d0c1f5cb7 lite: disable debug logging 2019-05-06 15:17:08 -05:00
William Pitcock 43ca536b9f lite: disable some bloat 2019-05-06 15:13:17 -05:00
William Pitcock 662957ca7d libpkgconf: tuple: tighten quoting logic a bit
closes #12
2019-03-23 22:34:11 -05:00
William Pitcock 3afd14c49e libpkgconf: path: use realpath(3) to deduplicate the search path
closes #24
2019-03-23 22:27:05 -05:00
William Pitcock ba1f48e48e libpkgconf: client: ensure PKG_CONFIG_LIBDIR being empty overrides the default search paths
closes #25
2019-03-23 22:18:40 -05:00
William Pitcock 183e68df39 libpkgconf: add LIBPKGCONF_VERSION macro 2019-01-14 13:52:04 -06:00
William Pitcock 6854265f28 libpkgconf: pkg: use pkgconf_fragment_copy_list() to clean up cflags gathering logic (closes #20) 2019-01-14 13:48:23 -06:00
William Pitcock 36a5b7acbd libpkgconf: fragment: add pkgconf_fragment_copy_list() 2019-01-14 13:48:02 -06:00
William Pitcock 0ae52182c9 libpkgconf: pkg: clean up pkgconf_parser interactions (closes #13) 2019-01-14 13:11:59 -06:00
Ignacio Casal Quinteiro 2c05971029 Canonicalize paths before using them
This fixes a problem where on Windows the prefix would
not match if the prefix is generated with backslashes
and the rest of the variables use normal slashes
2018-09-17 16:31:25 +02:00
Ignacio Casal Quinteiro 9f17da92d2 On Windows the path prefix should be checked caseless 2018-09-17 15:41:27 +02:00
Ignacio Casal Quinteiro c9dffb8570 Fix build on windows with meson 2018-09-17 15:41:27 +02:00
A. Wilcox 9b7affe0b1
tuple: Ensure buf length is always >= 1 in dequote
If a key is defined with no value, dequote will allocate a buffer with a
length of 0.  Since the buffer's length is 0, any manipulation of its
content is UB.

Example .pc file:

prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
includedir=${prefix}/include

xcflags=
xlibs= -lSM -lICE  -lX11

Name: Obt
Description: Openbox Toolkit Library
Version: 3.6
Requires: glib-2.0 libxml-2.0
Libs: -L${libdir} -lobt ${xlibs}
Cflags: -I${includedir}/openbox/3.6 ${xcflags}

Output using pkgconf 1.5.2 on x86_64 Linux/musl:

% pkgconf --cflags obt-3.5
-I/usr/include/openbox/3.6 \�\\�I\�\ -I/usr/include/glib-2.0 -I/usr/lib/glib-2.0/include -I/usr/include/libxml2
2018-07-28 19:06:33 -05:00
Graham Ollis fb08ae2bd2 environment variables for system paths should override compiled-in defaults 2018-06-25 06:36:57 -04:00
William Pitcock 6f05fec4b5 pkg: give a correctly sized vtable to the parser 2018-06-16 16:35:44 -05:00
William Pitcock b46bb93cd1 libpkgconf: tuple: properly dequote tuples when added from the parser (closes legacy github bug #186) 2018-06-14 16:12:04 -05:00
Graham Ollis 273d1d0461 use pkgconf_strlcpy
On Debian/Ubuntu I get:

  CC       libpkgconf/personality.lo
  libpkgconf/personality.c: In function ‘load_personality_with_path’:
  libpkgconf/personality.c:195:3: warning: implicit declaration of function ‘strlcpy’ [-Wimplicit-function-declaration]
  strlcpy(pathbuf, path, sizeof pathbuf);
        ^~~~~~~
  CC       libpkgconf/parser.lo
  CCLD     libpkgconf.la
  ar: `u' modifier ignored since `D' is the default (see `U')
  CC       cli/pkgconf-main.o
  CC       cli/pkgconf-getopt_long.o
  CC       cli/pkgconf-renderer-msvc.o
  CCLD     pkgconf
  ./.libs/libpkgconf.so: undefined reference to `strlcpy'
2018-06-14 14:46:34 -05:00
William Pitcock 3ccc4454d1 libpkgconf: personality: ensure the path list is properly initialized before searching for triplets 2018-05-10 13:36:22 -05:00
William Pitcock 40897f246b libpkgconf: personality: remove const from the default personality, since it's not really const 2018-05-09 22:52:27 -05:00
William Pitcock 25b2105e93 libpkgconf: client: if tracing is disabled, don't try to trace 2018-05-09 22:52:07 -05:00
William Pitcock e6ce6c8edd libpkgconf: personality: fixups 2018-05-09 22:39:39 -05:00
William Pitcock 751348298b libpkgconf: personality: fill in the rest of the personality parser 2018-05-09 22:08:28 -05:00
William Pitcock 1244f8f8e7 libpkgconf: refactor out the rfc822 message parser so that the cross-personality code can share it 2018-05-09 21:21:39 -05:00
William Pitcock f702967d0a libpkgconf: pkg: refactor pkgconf_pkg_new_from_file to prepare to factor out the rfc822 parser 2018-05-09 19:56:30 -05:00
William Pitcock 0f17a4f390 libpkgconf: pkg: mark owning client earlier, to allow for refactoring out the rfc822 parser 2018-05-09 19:33:12 -05:00
William Pitcock 9439b683ca libpkgconf: personality: add stub cross personality loader 2018-05-09 19:27:53 -05:00
William Pitcock 6b0e346c28 libpkgconf: refactor building the dir lists into separate concerns 2018-05-09 17:07:26 -05:00
William Pitcock 854490c5b9 libpkgconf: add basic support for cross-compile personality objects 2018-05-09 16:54:21 -05:00
William Pitcock 43e8c7b44d libpkgconf: path: add path list copying function 2018-05-09 16:35:21 -05:00