kernel/git - git - PowerEL Git System

Author	SHA1	Message	Date
Jeff King	c43ab06259	tree-walk: add a strbuf wrapper for make_traverse_path() All but one of the callers of make_traverse_path() allocate a new heap buffer to store the path. Let's give them an easy way to write to a strbuf, which saves them from computing the length themselves (which is especially tricky when they want to add to the path). It will also make it easier for us to change the make_traverse_path() interface in a future patch to improve its bounds-checking. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>	6 years ago
Jeff King	947208b725	setup_traverse_info(): stop copying oid We assume that if setup_traverse_info() is passed a non-empty "base" string, that string is pointing into a tree object and we can read the object oid by skipping past the trailing NUL. As it turns out, this is not true for either of the two calls, and we may end up reading garbage bytes: 1. In git-merge-tree, our base string is either empty (in which case we'd never run this code), or it comes from our traverse_path() helper. The latter overallocates a buffer by the_hash_algo->rawsz bytes, but then fills it with only make_traverse_path(), leaving those extra bytes uninitialized (but part of a legitimate heap buffer). 2. In unpack_trees(), we pass o->prefix, which is some arbitrary string from the caller. In "git read-tree --prefix=foo", for instance, it will point to the command-line parameter, and we'll read 20 bytes past the end of the string. Interestingly, tools like ASan do not detect (2) because the process argv is part of a big pre-allocated buffer. So we're reading trash, but it's trash that's probably part of the next argument, or the environment. You can convince it to fail by putting something like this at the beginning of common-main.c's main() function: { int i; for (i = 0; i < argc; i++) argv[i] = xstrdup_or_null(argv[i]); } That puts the arguments into their own heap buffers, so running: make SANITIZE=address test will find problems when "read-tree --prefix" is used (e.g., in t3030). Doubly interesting, even with the hackery above, this does not fail prior to `ea82b2a085` (tree-walk: store object_id in a separate member, 2019-01-15). That commit switched setup_traverse_info() to actually copying the hash, rather than simply pointing to it. That pointer was always pointing to garbage memory, but that commit started actually dereferencing the bytes, which is what triggers ASan. That also implies that nobody actually cares about reading these oid bytes anyway (or at least no path covered by our tests). And manual inspection of the code backs that up (I'll follow this patch with some cleanups that show definitively this is the case, but they're quite invasive, so it's worth doing this fix on its own). So let's drop the bogus hashcpy(), along with the confusing oversizing in merge-tree. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>	6 years ago
René Scharfe	5c377d3d59	tree-walk: convert fill_tree_descriptor() to object_id All callers of fill_tree_descriptor() have been converted to object_id already, so convert that function as well. As a nice side-effect we get rid of NULL checks in tree-diff.c, as fill_tree_descriptor() already does them for us. Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Rene Scharfe <l.s.r@web.de> Reviewed-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>	8 years ago
Matthieu Moy	e6c111b4c0	unpack_trees: group error messages by type When an error is encountered, it calls add_rejected_file() which either - directly displays the error message and stops if in plumbing mode (i.e. if show_all_errors is not initialized at 1) - or stores it so that it will be displayed at the end with display_error_msgs(), Storing the files by error type permits to have a list of files for which there is the same error instead of having a serie of almost identical errors. As each bind_overlap error combines a file and an old file, a list cannot be done, therefore, theses errors are not stored but directly displayed. Signed-off-by: Matthieu Moy <Matthieu.Moy@imag.fr> Signed-off-by: Junio C Hamano <gitster@pobox.com>	15 years ago
Stephen Boyd	6639ffc2e0	technical-docs: document tree-walking API Signed-off-by: Stephen Boyd <bebarino@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>	16 years ago
Junio C Hamano	530e741c72	Start preparing the API documents. Most of them are still stubs, but the procedure to build the HTML documentation, maintaining the index and installing the end product are there. I placed names of people who are likely to know the most about the topic in the stub files, so that volunteers will know whom to ask questions as needed. Signed-off-by: Junio C Hamano <gitster@pobox.com>	17 years ago