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2012-10-02do not write outside heap bufferJim Meyering
* parsing.c (substr): Handle tail < head. This started when I noticed some cgit segfaults on savannah.gnu.org. Finding the offending URL/commit and then constructing a stand-alone reproducer were far more time-consuming than writing the actual patch. The problem arises with a commit like this, in which the user name part of the "Author" field is empty: $ git log -1 commit 6f3f41d73393278f3ede68a2cb1e7a2a23fa3421 Author: <T at h.or> Date: Mon Apr 23 22:29:16 2012 +0200 Here's what happens: (this is due to buf=malloc(0); strncpy (buf, head, -1); where "head" may point to plenty of attacker-specified non-NUL bytes, so we can overwrite a zero-length heap buffer with arbitrary data) Invalid write of size 1 at 0x4A09361: strncpy (mc_replace_strmem.c:463) by 0x408977: substr (parsing.c:61) by 0x4089EF: parse_user (parsing.c:73) by 0x408D10: cgit_parse_commit (parsing.c:153) by 0x40A540: cgit_mk_refinfo (shared.c:171) by 0x40A581: cgit_refs_cb (shared.c:181) by 0x43DEB3: do_for_each_ref (refs.c:690) by 0x41075E: cgit_print_branches (ui-refs.c:191) by 0x416EF2: cgit_print_summary (ui-summary.c:56) by 0x40780A: summary_fn (cmd.c:120) by 0x40667A: process_request (cgit.c:544) by 0x404078: cache_process (cache.c:322) Address 0x4c718d0 is 0 bytes after a block of size 0 alloc'd at 0x4A0884D: malloc (vg_replace_malloc.c:263) by 0x455C85: xmalloc (wrapper.c:35) by 0x40894C: substr (parsing.c:60) by 0x4089EF: parse_user (parsing.c:73) by 0x408D10: cgit_parse_commit (parsing.c:153) by 0x40A540: cgit_mk_refinfo (shared.c:171) by 0x40A581: cgit_refs_cb (shared.c:181) by 0x43DEB3: do_for_each_ref (refs.c:690) by 0x41075E: cgit_print_branches (ui-refs.c:191) by 0x416EF2: cgit_print_summary (ui-summary.c:56) by 0x40780A: summary_fn (cmd.c:120) by 0x40667A: process_request (cgit.c:544) Invalid write of size 1 at 0x4A09400: strncpy (mc_replace_strmem.c:463) by 0x408977: substr (parsing.c:61) by 0x4089EF: parse_user (parsing.c:73) by 0x408D10: cgit_parse_commit (parsing.c:153) by 0x40A540: cgit_mk_refinfo (shared.c:171) by 0x40A581: cgit_refs_cb (shared.c:181) by 0x43DEB3: do_for_each_ref (refs.c:690) by 0x41075E: cgit_print_branches (ui-refs.c:191) by 0x416EF2: cgit_print_summary (ui-summary.c:56) by 0x40780A: summary_fn (cmd.c:120) by 0x40667A: process_request (cgit.c:544) by 0x404078: cache_process (cache.c:322) Address 0x4c7192b is not stack'd, malloc'd or (recently) free'd Invalid write of size 1 at 0x4A0940E: strncpy (mc_replace_strmem.c:463) by 0x408977: substr (parsing.c:61) by 0x4089EF: parse_user (parsing.c:73) by 0x408D10: cgit_parse_commit (parsing.c:153) by 0x40A540: cgit_mk_refinfo (shared.c:171) by 0x40A581: cgit_refs_cb (shared.c:181) by 0x43DEB3: do_for_each_ref (refs.c:690) by 0x41075E: cgit_print_branches (ui-refs.c:191) by 0x416EF2: cgit_print_summary (ui-summary.c:56) by 0x40780A: summary_fn (cmd.c:120) by 0x40667A: process_request (cgit.c:544) by 0x404078: cache_process (cache.c:322) Address 0x4c7192d is not stack'd, malloc'd or (recently) free'd Process terminating with default action of signal 11 (SIGSEGV) Access not within mapped region at address 0x502F000 at 0x4A09400: strncpy (mc_replace_strmem.c:463) by 0x408977: substr (parsing.c:61) by 0x4089EF: parse_user (parsing.c:73) by 0x408D10: cgit_parse_commit (parsing.c:153) by 0x40A540: cgit_mk_refinfo (shared.c:171) by 0x40A581: cgit_refs_cb (shared.c:181) by 0x43DEB3: do_for_each_ref (refs.c:690) by 0x41075E: cgit_print_branches (ui-refs.c:191) by 0x416EF2: cgit_print_summary (ui-summary.c:56) by 0x40780A: summary_fn (cmd.c:120) by 0x40667A: process_request (cgit.c:544) by 0x404078: cache_process (cache.c:322) This happens when tail - head == -1 here: (parsing.c) char *substr(const char *head, const char *tail) { char *buf; buf = xmalloc(tail - head + 1); strncpy(buf, head, tail - head); buf[tail - head] = '\0'; return buf; } char *parse_user(char *t, char **name, char **email, unsigned long *date) { char *p = t; int mode = 1; while (p && *p) { if (mode == 1 && *p == '<') { *name = substr(t, p - 1); t = p; mode++; } else if (mode == 1 && *p == '\n') { The fix is to handle the case of (tail < head) before calling xmalloc, thus avoiding passing an invalid value to xmalloc. And here's the reproducer: It was tricky to reproduce, because git prohibits use of an empty "name" in a commit ID. To construct the offending commit, I had to resort to using "git hash-object". git init -q foo && ( cd foo && echo a > j && git add . && git ci -q --author='au <T at h.or>' -m. . && h=$(git cat-file commit HEAD|sed 's/au //' \ |git hash-object -t commit -w --stdin) && git co -q -b test $h && git br -q -D master && git br -q -m test master) git clone -q --bare foo foo.git cat <<EOF > in repo.url=foo.git repo.path=foo.git EOF CGIT_CONFIG=in QUERY_STRING=url=foo.git valgrind ./cgit The valgrind output is what you see above. AFAICS, this is not exploitable thanks (ironically) to the use of strncpy. Since that -1 translates to SIZE_MAX and this is strncpy, not only does it copy whatever is in "head" (up to first NUL), but it also writes SIZE_MAX - strlen(head) NUL bytes into the destination buffer, and that latter is guaranteed to evoke a segfault. Since cgit is single-threaded, AFAICS, there is no way that the buffer clobbering can be turned into an exploit.
2012-09-27ui-snapshot: pass -n to gzip, to suppress timestampJason A. Donenfeld
Since cgit snapshots of tags are often used for releases, we don't want the rarely used feature of the gzip compressor that includes an embedded timestamp into the archive, since this makes each tarball of the same (potentially signed) tag different. This commit refactors the archive handling code a bit so that each different format is able to run with an arbitrary argv for the filter.
2012-07-12Update copyright headers to have latest dates.Jason A. Donenfeld
2012-07-12ui-repolist: Case insensitive sorting and age sortJason A. Donenfeld
Add two options, one for doing the ordinary name sorts in a case-insensitive manner, and another for choosing to sort repos in each section by age instead of by name.
2012-07-12scan-tree: Support gitweb.category.Jason A. Donenfeld
Use gitweb.category from git config to determine repo's section, if option is enabled.
2012-07-12scan-tree: Support gitweb.description.Jason A. Donenfeld
Use gitweb.description instead of description file to determine description, if option is enabled.
2012-03-20css: only use div#cgitFerry Huberts
Don't bother with 'body' and 'div#cgit form', since everything is wrapped in 'div#cgit' already. Removing these two types makes embedding even easier. Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
2012-03-18Merge branch 'fh/mimetypes'Lars Hjemli
2012-03-18Merge branch 'jp/defbranch'Lars Hjemli
2012-03-18Merge branch 'lh/module-links'Lars Hjemli
2012-03-18Merge branch 'stable'Lars Hjemli
2012-03-18css: force text color to black on decorationsFerry Huberts
improves readability when embedding into a page that has the text color set to a different color Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
2012-03-18css: vertically align the cgit logo imageFerry Huberts
When embedding cgit in other pages, the logo alignment needs to be specified to avoid any css rules from the embedding page to make the page look bad. Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
2012-03-18css: prefix all styles with div#cgitFerry Huberts
to facilitate easier embedding Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
2012-03-18filters/syntax-highlighting.sh: work around highlight --force bugFerry Huberts
2012-03-18filters/highlight.sh: manually support highlight version 2 and 3Ferry Huberts
2012-03-18tests: properly quote arguments to printfFerry Huberts
v2: incorporate remarks of Lukas Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
2012-03-18tests: handle paths with whitespaceFerry Huberts
v2: incorporate remarks of Lukas Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
2012-03-18Merge branch 'stable'Lars Hjemli
2012-03-18CGIT-0.9.0.3Lars Hjemli
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2012-03-18Merge branch 'stable'Lars Hjemli
2012-03-18segfault fix on some bogus requestsEric Wong
ctx.qry.head can be NULL in some cases due to bad requests by weird bots. I managed to reproduce with: PATH_INFO=/repo.git/shop.php QUERY_STRING=id= Signed-off-by: Eric Wong <normalperson@yhbt.net>
2012-03-18use correct type for sizeofJamie Couture
**L would have worked well too. Depending on the distribution sizeof *L may return 8 instead of 4. **L is preferable, but since we don't expect this datatype to change very often, sizeof int is less subtle and easier to understand. Signed-off-by: Jamie Couture <jamie.couture@gmail.com>
2012-01-08ui-ssdiff.c: correct length check for LCS tableEric Wong
Each individual string may be too long for its respective dimension of the LCS table. Signed-off-by: Eric Wong <normalperson@yhbt.net>
2012-01-03Merge branch 'stable'Lars Hjemli
2012-01-03Fix segmentation fault in empty repositoryJohn Keeping
When a repository is empty, the ATOM feed link is written in the header, but this involves formatting ctx->qry.head which is NULL in this case. With glibc, vsnprintf formats "%s" with a NULL input as "(null)" but on Solaris this results in a segmentation fault. Since we don't have a meaningful head for the atom feed in an empty repository, it's simplest not to write out the link element at all. Signed-off-by: John Keeping <john@metanate.com>
2012-01-03Merge branch 'stable'Lars Hjemli
2012-01-03Makefile: fetch git tarballs from http://hjemli.net/git/git/Lars Hjemli
The git tarballs are currently not available from kernel.org, so for now the makefile will download autogenerated tarballs from cgit. Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2012-01-03fix css color value and vertical-align valueNorberto Lopes
2012-01-03ui-ssdiff.c: set correct diffmode in "control panel"Tim Chen
When side-by-side-diffs=1 was set in cgitrc, specifying 'ss=0' in the querystring would not set the 'unified' option as active in the dropdown box used to select diffmode.
2012-01-03Merge branch 'stable'Lars Hjemli
2012-01-03Fix diff mode switching when side-by-side-diffs=1Tim Chen
When side-by-side-diffs=1 was set in cgitrc, specyfing 'ss=0' in the query- string would not switch to unified diffs. This patch fixes the issue by introducing a separate variable to track the occurrence of "ss" in the querystring.
2012-01-03ui-log.c: do not show remote heads if enable-remote-branches=0Georg Müller
If remote branches are not enabled, the branches are still listed in the log view. This patch removes them if enable-remote-branches=0.
2012-01-03Add sort parameter to pager of repo listTobias Grimm
When the repolist is paged, the page-links are missing the sort parameter, causing the initial page to be custom sorted, but any clicked page will then be with the default sort order again.
2012-01-03ui-ssdiff: move LCS table away from the stackJamie Couture
Printing deferred line changes for files containing long lines would cause a segfault. - limit LCS table size: 128x128. - move LCS table to global context: avoid allocating/freeing memory for every deferred line change. Signed-off-by: Jamie Couture <jamie.couture@gmail.com>
2012-01-03shared.c: Only setenv() if value is non-nullLukas Fleischer
Some setenv() implementations (e.g. the one in OpenBSD's stdlib) segfault if we pass a NULL value. Only set environment variables if the corresponding settings are defined to avoid this. Note that this is a minor behaviour change as environment variables were supposed to be set to an empty string if a setting was undefined. Given that this feature isn't part of any official release yet, there's no need to worry about backwards compatibility, really. Change the documentation accordingly. Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
2012-01-03shared.c: Remove unused "linux/limits.h" includeLukas Fleischer
This isn't used anywhere and prevents the code from being compiled on other platforms, such as *BSD. Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de>
2011-07-22Merge branch 'stable'Lars Hjemli
2011-07-22Fix potential XSS vulnerability in rename hintLukas Fleischer
The file name displayed in the rename hint should be escaped to avoid XSS. Note that this vulnerability is only applicable when an attacker has gained push access to the repository. Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de> Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-07-22Remove dead initialization in cgit_parse_commit()Lukas Fleischer
The value stored to "t" during its initialization gets overwritten in any case, so just leave it uninitialized. Spotted by clang-analyzer. Signed-off-by: Lukas Fleischer <cgit@cryptocrack.de> Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-07-21Merge branch 'stable'Lars Hjemli
2011-07-21CGIT 0.9.0.2Lars Hjemli
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-07-21html.c: avoid out-of-bounds access for url_escape_tableEric Wong
This fixes a segfault for me with with -O2 optimization on x86 with gcc (Debian 4.4.5-8) 4.4.5 I can reliably reproduce it with the following parameters when pointed to the git.git repository: PATH_INFO='/git-core.git/diff/' QUERY_STRING='id=2b93bfac0f5bcabbf60f174f4e7bfa9e318e64d5&id2=d6da71a9d16b8cf27f9d8f90692d3625c849cbc8' Signed-off-by: Eric Wong <normalperson@yhbt.net> Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-07-21Merge branch 'stable'Lars Hjemli
2011-07-21tests: fix failures when CDPATH is setFerry Huberts
Some tests would otherwise fail because commands such as cd trash/repos/foo && git rev-list --reverse HEAD | head -1 would return 2 lines instead of 1: the 'cd' command also prints the path when CDPATH is set. Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl> Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-07-19ui-repolist.c: fallback to "master" if no default branch is specifiedLars Hjemli
When looking for the modtime of a repo we used to rely on repo.defbranch having a value. This is no longer true so this patch provides a default value when needed. Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-07-19ui_plain: automatically lookup mimetype when mimetype-file is setFerry Huberts
For sites that do not want to configure mime types by hand but still want the correct mime type for 'plain' blobs, configuring a mime type file is made possible. This is handy since such a file is normally already provided (at least on Linux systems). Also, this reflects the gitweb option '$mimetypes_file' Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl> Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-07-19Makefile: fix oversight of not using $(DESTDIR) in uninstallFerry Huberts
Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl> Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-07-19commit-links.sh: improve regular expressionsFerry Huberts
The default length for sha1 abbreviations in git is 7. A '#num' at the beginning of the commit message is now recognised, a ':#num' as well, etc.: a '#num' anywhere is now converted to a link. Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl> Signed-off-by: Lars Hjemli <hjemli@gmail.com>
2011-06-20cgit.c: use resolve_ref() to guess_defbranch()Lars Hjemli
The resolve_ref() function handles reading of git- and filesystem symbolic links (including proper whitespace trimming) and packed refs. There's no point in reimplementing this function in cgit. Signed-off-by: Lars Hjemli <hjemli@gmail.com>