git/fsck.c
Jeff King 8597ea3afe commit: record buffer length in cache
Most callsites which use the commit buffer try to use the
cached version attached to the commit, rather than
re-reading from disk. Unfortunately, that interface provides
only a pointer to the NUL-terminated buffer, with no
indication of the original length.

For the most part, this doesn't matter. People do not put
NULs in their commit messages, and the log code is happy to
treat it all as a NUL-terminated string. However, some code
paths do care. For example, when checking signatures, we
want to be very careful that we verify all the bytes to
avoid malicious trickery.

This patch just adds an optional "size" out-pointer to
get_commit_buffer and friends. The existing callers all pass
NULL (there did not seem to be any obvious sites where we
could avoid an immediate strlen() call, though perhaps with
some further refactoring we could).

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-06-13 12:09:38 -07:00

390 lines
10 KiB
C

#include "cache.h"
#include "object.h"
#include "blob.h"
#include "tree.h"
#include "tree-walk.h"
#include "commit.h"
#include "tag.h"
#include "fsck.h"
static int fsck_walk_tree(struct tree *tree, fsck_walk_func walk, void *data)
{
struct tree_desc desc;
struct name_entry entry;
int res = 0;
if (parse_tree(tree))
return -1;
init_tree_desc(&desc, tree->buffer, tree->size);
while (tree_entry(&desc, &entry)) {
int result;
if (S_ISGITLINK(entry.mode))
continue;
if (S_ISDIR(entry.mode))
result = walk(&lookup_tree(entry.sha1)->object, OBJ_TREE, data);
else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode))
result = walk(&lookup_blob(entry.sha1)->object, OBJ_BLOB, data);
else {
result = error("in tree %s: entry %s has bad mode %.6o",
sha1_to_hex(tree->object.sha1), entry.path, entry.mode);
}
if (result < 0)
return result;
if (!res)
res = result;
}
return res;
}
static int fsck_walk_commit(struct commit *commit, fsck_walk_func walk, void *data)
{
struct commit_list *parents;
int res;
int result;
if (parse_commit(commit))
return -1;
result = walk((struct object *)commit->tree, OBJ_TREE, data);
if (result < 0)
return result;
res = result;
parents = commit->parents;
while (parents) {
result = walk((struct object *)parents->item, OBJ_COMMIT, data);
if (result < 0)
return result;
if (!res)
res = result;
parents = parents->next;
}
return res;
}
static int fsck_walk_tag(struct tag *tag, fsck_walk_func walk, void *data)
{
if (parse_tag(tag))
return -1;
return walk(tag->tagged, OBJ_ANY, data);
}
int fsck_walk(struct object *obj, fsck_walk_func walk, void *data)
{
if (!obj)
return -1;
switch (obj->type) {
case OBJ_BLOB:
return 0;
case OBJ_TREE:
return fsck_walk_tree((struct tree *)obj, walk, data);
case OBJ_COMMIT:
return fsck_walk_commit((struct commit *)obj, walk, data);
case OBJ_TAG:
return fsck_walk_tag((struct tag *)obj, walk, data);
default:
error("Unknown object type for %s", sha1_to_hex(obj->sha1));
return -1;
}
}
/*
* The entries in a tree are ordered in the _path_ order,
* which means that a directory entry is ordered by adding
* a slash to the end of it.
*
* So a directory called "a" is ordered _after_ a file
* called "a.c", because "a/" sorts after "a.c".
*/
#define TREE_UNORDERED (-1)
#define TREE_HAS_DUPS (-2)
static int verify_ordered(unsigned mode1, const char *name1, unsigned mode2, const char *name2)
{
int len1 = strlen(name1);
int len2 = strlen(name2);
int len = len1 < len2 ? len1 : len2;
unsigned char c1, c2;
int cmp;
cmp = memcmp(name1, name2, len);
if (cmp < 0)
return 0;
if (cmp > 0)
return TREE_UNORDERED;
/*
* Ok, the first <len> characters are the same.
* Now we need to order the next one, but turn
* a '\0' into a '/' for a directory entry.
*/
c1 = name1[len];
c2 = name2[len];
if (!c1 && !c2)
/*
* git-write-tree used to write out a nonsense tree that has
* entries with the same name, one blob and one tree. Make
* sure we do not have duplicate entries.
*/
return TREE_HAS_DUPS;
if (!c1 && S_ISDIR(mode1))
c1 = '/';
if (!c2 && S_ISDIR(mode2))
c2 = '/';
return c1 < c2 ? 0 : TREE_UNORDERED;
}
static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
{
int retval;
int has_null_sha1 = 0;
int has_full_path = 0;
int has_empty_name = 0;
int has_dot = 0;
int has_dotdot = 0;
int has_dotgit = 0;
int has_zero_pad = 0;
int has_bad_modes = 0;
int has_dup_entries = 0;
int not_properly_sorted = 0;
struct tree_desc desc;
unsigned o_mode;
const char *o_name;
init_tree_desc(&desc, item->buffer, item->size);
o_mode = 0;
o_name = NULL;
while (desc.size) {
unsigned mode;
const char *name;
const unsigned char *sha1;
sha1 = tree_entry_extract(&desc, &name, &mode);
has_null_sha1 |= is_null_sha1(sha1);
has_full_path |= !!strchr(name, '/');
has_empty_name |= !*name;
has_dot |= !strcmp(name, ".");
has_dotdot |= !strcmp(name, "..");
has_dotgit |= !strcmp(name, ".git");
has_zero_pad |= *(char *)desc.buffer == '0';
update_tree_entry(&desc);
switch (mode) {
/*
* Standard modes..
*/
case S_IFREG | 0755:
case S_IFREG | 0644:
case S_IFLNK:
case S_IFDIR:
case S_IFGITLINK:
break;
/*
* This is nonstandard, but we had a few of these
* early on when we honored the full set of mode
* bits..
*/
case S_IFREG | 0664:
if (!strict)
break;
default:
has_bad_modes = 1;
}
if (o_name) {
switch (verify_ordered(o_mode, o_name, mode, name)) {
case TREE_UNORDERED:
not_properly_sorted = 1;
break;
case TREE_HAS_DUPS:
has_dup_entries = 1;
break;
default:
break;
}
}
o_mode = mode;
o_name = name;
}
retval = 0;
if (has_null_sha1)
retval += error_func(&item->object, FSCK_WARN, "contains entries pointing to null sha1");
if (has_full_path)
retval += error_func(&item->object, FSCK_WARN, "contains full pathnames");
if (has_empty_name)
retval += error_func(&item->object, FSCK_WARN, "contains empty pathname");
if (has_dot)
retval += error_func(&item->object, FSCK_WARN, "contains '.'");
if (has_dotdot)
retval += error_func(&item->object, FSCK_WARN, "contains '..'");
if (has_dotgit)
retval += error_func(&item->object, FSCK_WARN, "contains '.git'");
if (has_zero_pad)
retval += error_func(&item->object, FSCK_WARN, "contains zero-padded file modes");
if (has_bad_modes)
retval += error_func(&item->object, FSCK_WARN, "contains bad file modes");
if (has_dup_entries)
retval += error_func(&item->object, FSCK_ERROR, "contains duplicate file entries");
if (not_properly_sorted)
retval += error_func(&item->object, FSCK_ERROR, "not properly sorted");
return retval;
}
static int fsck_ident(const char **ident, struct object *obj, fsck_error error_func)
{
char *end;
if (**ident == '<')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
*ident += strcspn(*ident, "<>\n");
if (**ident == '>')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad name");
if (**ident != '<')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing email");
if ((*ident)[-1] != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before email");
(*ident)++;
*ident += strcspn(*ident, "<>\n");
if (**ident != '>')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad email");
(*ident)++;
if (**ident != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - missing space before date");
(*ident)++;
if (**ident == '0' && (*ident)[1] != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
if (date_overflows(strtoul(*ident, &end, 10)))
return error_func(obj, FSCK_ERROR, "invalid author/committer line - date causes integer overflow");
if (end == *ident || *end != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad date");
*ident = end + 1;
if ((**ident != '+' && **ident != '-') ||
!isdigit((*ident)[1]) ||
!isdigit((*ident)[2]) ||
!isdigit((*ident)[3]) ||
!isdigit((*ident)[4]) ||
((*ident)[5] != '\n'))
return error_func(obj, FSCK_ERROR, "invalid author/committer line - bad time zone");
(*ident) += 6;
return 0;
}
static int fsck_commit_buffer(struct commit *commit, const char *buffer,
fsck_error error_func)
{
const char *tmp;
unsigned char tree_sha1[20], sha1[20];
struct commit_graft *graft;
int parents = 0;
int err;
buffer = skip_prefix(buffer, "tree ");
if (!buffer)
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
buffer += 41;
while ((tmp = skip_prefix(buffer, "parent "))) {
buffer = tmp;
if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
buffer += 41;
parents++;
}
graft = lookup_commit_graft(commit->object.sha1);
if (graft) {
struct commit_list *p = commit->parents;
parents = 0;
while (p) {
p = p->next;
parents++;
}
if (graft->nr_parent == -1 && !parents)
; /* shallow commit */
else if (graft->nr_parent != parents)
return error_func(&commit->object, FSCK_ERROR, "graft objects missing");
} else {
struct commit_list *p = commit->parents;
while (p && parents) {
p = p->next;
parents--;
}
if (p || parents)
return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
}
buffer = skip_prefix(buffer, "author ");
if (!buffer)
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
err = fsck_ident(&buffer, &commit->object, error_func);
if (err)
return err;
buffer = skip_prefix(buffer, "committer ");
if (!buffer)
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
err = fsck_ident(&buffer, &commit->object, error_func);
if (err)
return err;
if (!commit->tree)
return error_func(&commit->object, FSCK_ERROR, "could not load commit's tree %s", sha1_to_hex(tree_sha1));
return 0;
}
static int fsck_commit(struct commit *commit, fsck_error error_func)
{
const char *buffer = get_commit_buffer(commit, NULL);
int ret = fsck_commit_buffer(commit, buffer, error_func);
unuse_commit_buffer(commit, buffer);
return ret;
}
static int fsck_tag(struct tag *tag, fsck_error error_func)
{
struct object *tagged = tag->tagged;
if (!tagged)
return error_func(&tag->object, FSCK_ERROR, "could not load tagged object");
return 0;
}
int fsck_object(struct object *obj, int strict, fsck_error error_func)
{
if (!obj)
return error_func(obj, FSCK_ERROR, "no valid object to fsck");
if (obj->type == OBJ_BLOB)
return 0;
if (obj->type == OBJ_TREE)
return fsck_tree((struct tree *) obj, strict, error_func);
if (obj->type == OBJ_COMMIT)
return fsck_commit((struct commit *) obj, error_func);
if (obj->type == OBJ_TAG)
return fsck_tag((struct tag *) obj, error_func);
return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
obj->type);
}
int fsck_error_function(struct object *obj, int type, const char *fmt, ...)
{
va_list ap;
struct strbuf sb = STRBUF_INIT;
strbuf_addf(&sb, "object %s:", sha1_to_hex(obj->sha1));
va_start(ap, fmt);
strbuf_vaddf(&sb, fmt, ap);
va_end(ap);
error("%s", sb.buf);
strbuf_release(&sb);
return 1;
}