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-rw-r--r--fsck.c209
1 files changed, 157 insertions, 52 deletions
diff --git a/fsck.c b/fsck.c
index 0b76de6..10bcb65 100644
--- a/fsck.c
+++ b/fsck.c
@@ -6,6 +6,7 @@
#include "commit.h"
#include "tag.h"
#include "fsck.h"
+#include "refs.h"
#include "utf8.h"
static int fsck_walk_tree(struct tree *tree, fsck_walk_func walk, void *data)
@@ -166,19 +167,14 @@ static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
sha1 = tree_entry_extract(&desc, &name, &mode);
- if (is_null_sha1(sha1))
- has_null_sha1 = 1;
- if (strchr(name, '/'))
- has_full_path = 1;
- if (!*name)
- has_empty_name = 1;
- if (!strcmp(name, "."))
- has_dot = 1;
- if (!strcmp(name, ".."))
- has_dotdot = 1;
- if (!strcasecmp(name, ".git") || is_hfs_dotgit(name) ||
- is_ntfs_dotgit(name))
- has_dotgit = 1;
+ 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") ||
+ is_hfs_dotgit(name) ||
+ is_ntfs_dotgit(name));
has_zero_pad |= *(char *)desc.buffer == '0';
update_tree_entry(&desc);
@@ -245,8 +241,30 @@ static int fsck_tree(struct tree *item, int strict, fsck_error error_func)
return retval;
}
-static int fsck_ident(char **ident, struct object *obj, fsck_error error_func)
+static int require_end_of_header(const void *data, unsigned long size,
+ struct object *obj, fsck_error error_func)
{
+ const char *buffer = (const char *)data;
+ unsigned long i;
+
+ for (i = 0; i < size; i++) {
+ switch (buffer[i]) {
+ case '\0':
+ return error_func(obj, FSCK_ERROR,
+ "unterminated header: NUL at offset %d", i);
+ case '\n':
+ if (i + 1 < size && buffer[i + 1] == '\n')
+ return 0;
+ }
+ }
+
+ return error_func(obj, FSCK_ERROR, "unterminated header");
+}
+
+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");
@@ -266,10 +284,11 @@ static int fsck_ident(char **ident, struct object *obj, fsck_error error_func)
(*ident)++;
if (**ident == '0' && (*ident)[1] != ' ')
return error_func(obj, FSCK_ERROR, "invalid author/committer line - zero-padded date");
- *ident += strspn(*ident, "0123456789");
- if (**ident != ' ')
+ 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)++;
+ *ident = end + 1;
if ((**ident != '+' && **ident != '-') ||
!isdigit((*ident)[1]) ||
!isdigit((*ident)[2]) ||
@@ -281,58 +300,46 @@ static int fsck_ident(char **ident, struct object *obj, fsck_error error_func)
return 0;
}
-static int fsck_commit(struct commit *commit, fsck_error error_func)
+static int fsck_commit_buffer(struct commit *commit, const char *buffer,
+ unsigned long size, fsck_error error_func)
{
- char *buffer = commit->buffer;
unsigned char tree_sha1[20], sha1[20];
struct commit_graft *graft;
- int parents = 0;
+ unsigned parent_count, parent_line_count = 0;
int err;
- if (commit->date == ULONG_MAX)
- return error_func(&commit->object, FSCK_ERROR, "invalid author/committer line");
+ if (require_end_of_header(buffer, size, &commit->object, error_func))
+ return -1;
- if (memcmp(buffer, "tree ", 5))
+ if (!skip_prefix(buffer, "tree ", &buffer))
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'tree' line");
- if (get_sha1_hex(buffer+5, tree_sha1) || buffer[45] != '\n')
+ if (get_sha1_hex(buffer, tree_sha1) || buffer[40] != '\n')
return error_func(&commit->object, FSCK_ERROR, "invalid 'tree' line format - bad sha1");
- buffer += 46;
- while (!memcmp(buffer, "parent ", 7)) {
- if (get_sha1_hex(buffer+7, sha1) || buffer[47] != '\n')
+ buffer += 41;
+ while (skip_prefix(buffer, "parent ", &buffer)) {
+ if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n')
return error_func(&commit->object, FSCK_ERROR, "invalid 'parent' line format - bad sha1");
- buffer += 48;
- parents++;
+ buffer += 41;
+ parent_line_count++;
}
graft = lookup_commit_graft(commit->object.sha1);
+ parent_count = commit_list_count(commit->parents);
if (graft) {
- struct commit_list *p = commit->parents;
- parents = 0;
- while (p) {
- p = p->next;
- parents++;
- }
- if (graft->nr_parent == -1 && !parents)
+ if (graft->nr_parent == -1 && !parent_count)
; /* shallow commit */
- else if (graft->nr_parent != parents)
+ else if (graft->nr_parent != parent_count)
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)
+ if (parent_count != parent_line_count)
return error_func(&commit->object, FSCK_ERROR, "parent objects missing");
}
- if (memcmp(buffer, "author ", 7))
+ if (!skip_prefix(buffer, "author ", &buffer))
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'author' line");
- buffer += 7;
err = fsck_ident(&buffer, &commit->object, error_func);
if (err)
return err;
- if (memcmp(buffer, "committer ", strlen("committer ")))
+ if (!skip_prefix(buffer, "committer ", &buffer))
return error_func(&commit->object, FSCK_ERROR, "invalid format - expected 'committer' line");
- buffer += strlen("committer ");
err = fsck_ident(&buffer, &commit->object, error_func);
if (err)
return err;
@@ -342,16 +349,112 @@ static int fsck_commit(struct commit *commit, fsck_error error_func)
return 0;
}
-static int fsck_tag(struct tag *tag, fsck_error error_func)
+static int fsck_commit(struct commit *commit, const char *data,
+ unsigned long size, fsck_error error_func)
+{
+ const char *buffer = data ? data : get_commit_buffer(commit, &size);
+ int ret = fsck_commit_buffer(commit, buffer, size, error_func);
+ if (!data)
+ unuse_commit_buffer(commit, buffer);
+ return ret;
+}
+
+static int fsck_tag_buffer(struct tag *tag, const char *data,
+ unsigned long size, fsck_error error_func)
+{
+ unsigned char sha1[20];
+ int ret = 0;
+ const char *buffer;
+ char *to_free = NULL, *eol;
+ struct strbuf sb = STRBUF_INIT;
+
+ if (data)
+ buffer = data;
+ else {
+ enum object_type type;
+
+ buffer = to_free =
+ read_sha1_file(tag->object.sha1, &type, &size);
+ if (!buffer)
+ return error_func(&tag->object, FSCK_ERROR,
+ "cannot read tag object");
+
+ if (type != OBJ_TAG) {
+ ret = error_func(&tag->object, FSCK_ERROR,
+ "expected tag got %s",
+ typename(type));
+ goto done;
+ }
+ }
+
+ if (require_end_of_header(buffer, size, &tag->object, error_func))
+ goto done;
+
+ if (!skip_prefix(buffer, "object ", &buffer)) {
+ ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'object' line");
+ goto done;
+ }
+ if (get_sha1_hex(buffer, sha1) || buffer[40] != '\n') {
+ ret = error_func(&tag->object, FSCK_ERROR, "invalid 'object' line format - bad sha1");
+ goto done;
+ }
+ buffer += 41;
+
+ if (!skip_prefix(buffer, "type ", &buffer)) {
+ ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'type' line");
+ goto done;
+ }
+ eol = strchr(buffer, '\n');
+ if (!eol) {
+ ret = error_func(&tag->object, FSCK_ERROR, "invalid format - unexpected end after 'type' line");
+ goto done;
+ }
+ if (type_from_string_gently(buffer, eol - buffer, 1) < 0)
+ ret = error_func(&tag->object, FSCK_ERROR, "invalid 'type' value");
+ if (ret)
+ goto done;
+ buffer = eol + 1;
+
+ if (!skip_prefix(buffer, "tag ", &buffer)) {
+ ret = error_func(&tag->object, FSCK_ERROR, "invalid format - expected 'tag' line");
+ goto done;
+ }
+ eol = strchr(buffer, '\n');
+ if (!eol) {
+ ret = error_func(&tag->object, FSCK_ERROR, "invalid format - unexpected end after 'type' line");
+ goto done;
+ }
+ strbuf_addf(&sb, "refs/tags/%.*s", (int)(eol - buffer), buffer);
+ if (check_refname_format(sb.buf, 0))
+ error_func(&tag->object, FSCK_WARN, "invalid 'tag' name: %.*s",
+ (int)(eol - buffer), buffer);
+ buffer = eol + 1;
+
+ if (!skip_prefix(buffer, "tagger ", &buffer))
+ /* early tags do not contain 'tagger' lines; warn only */
+ error_func(&tag->object, FSCK_WARN, "invalid format - expected 'tagger' line");
+ else
+ ret = fsck_ident(&buffer, &tag->object, error_func);
+
+done:
+ strbuf_release(&sb);
+ free(to_free);
+ return ret;
+}
+
+static int fsck_tag(struct tag *tag, const char *data,
+ unsigned long size, 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;
+
+ return fsck_tag_buffer(tag, data, size, error_func);
}
-int fsck_object(struct object *obj, int strict, fsck_error error_func)
+int fsck_object(struct object *obj, void *data, unsigned long size,
+ int strict, fsck_error error_func)
{
if (!obj)
return error_func(obj, FSCK_ERROR, "no valid object to fsck");
@@ -361,9 +464,11 @@ int fsck_object(struct object *obj, int strict, fsck_error error_func)
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);
+ return fsck_commit((struct commit *) obj, (const char *) data,
+ size, error_func);
if (obj->type == OBJ_TAG)
- return fsck_tag((struct tag *) obj, error_func);
+ return fsck_tag((struct tag *) obj, (const char *) data,
+ size, error_func);
return error_func(obj, FSCK_ERROR, "unknown type '%d' (internal fsck error)",
obj->type);
generated by cgit v0.10.2-6-g49f6 at 2024-04-18 13:24:50 (GMT)