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![Junio C Hamano](/assets/img/avatar_default.png)
Fix "git fsck --name-objects" which apparently has not been used by anybody who is motivated enough to report breakage. * js/fsck-name-objects-fix: fsck --name-objects: be more careful parsing generation numbers t1450: robustify `remove_object()`
1344 lines
34 KiB
C
1344 lines
34 KiB
C
#include "cache.h"
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#include "object-store.h"
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#include "repository.h"
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#include "object.h"
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#include "blob.h"
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#include "tree.h"
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#include "tree-walk.h"
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#include "commit.h"
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#include "tag.h"
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#include "fsck.h"
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#include "refs.h"
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#include "url.h"
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#include "utf8.h"
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#include "decorate.h"
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#include "oidset.h"
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#include "packfile.h"
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#include "submodule-config.h"
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#include "config.h"
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#include "credential.h"
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#include "help.h"
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static struct oidset gitmodules_found = OIDSET_INIT;
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static struct oidset gitmodules_done = OIDSET_INIT;
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#define FSCK_FATAL -1
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#define FSCK_INFO -2
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#define FOREACH_MSG_ID(FUNC) \
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/* fatal errors */ \
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FUNC(NUL_IN_HEADER, FATAL) \
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FUNC(UNTERMINATED_HEADER, FATAL) \
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/* errors */ \
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FUNC(BAD_DATE, ERROR) \
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FUNC(BAD_DATE_OVERFLOW, ERROR) \
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FUNC(BAD_EMAIL, ERROR) \
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FUNC(BAD_NAME, ERROR) \
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FUNC(BAD_OBJECT_SHA1, ERROR) \
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FUNC(BAD_PARENT_SHA1, ERROR) \
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FUNC(BAD_TAG_OBJECT, ERROR) \
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FUNC(BAD_TIMEZONE, ERROR) \
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FUNC(BAD_TREE, ERROR) \
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FUNC(BAD_TREE_SHA1, ERROR) \
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FUNC(BAD_TYPE, ERROR) \
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FUNC(DUPLICATE_ENTRIES, ERROR) \
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FUNC(MISSING_AUTHOR, ERROR) \
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FUNC(MISSING_COMMITTER, ERROR) \
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FUNC(MISSING_EMAIL, ERROR) \
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FUNC(MISSING_NAME_BEFORE_EMAIL, ERROR) \
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FUNC(MISSING_OBJECT, ERROR) \
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FUNC(MISSING_SPACE_BEFORE_DATE, ERROR) \
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FUNC(MISSING_SPACE_BEFORE_EMAIL, ERROR) \
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FUNC(MISSING_TAG, ERROR) \
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FUNC(MISSING_TAG_ENTRY, ERROR) \
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FUNC(MISSING_TREE, ERROR) \
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FUNC(MISSING_TREE_OBJECT, ERROR) \
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FUNC(MISSING_TYPE, ERROR) \
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FUNC(MISSING_TYPE_ENTRY, ERROR) \
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FUNC(MULTIPLE_AUTHORS, ERROR) \
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FUNC(TREE_NOT_SORTED, ERROR) \
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FUNC(UNKNOWN_TYPE, ERROR) \
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FUNC(ZERO_PADDED_DATE, ERROR) \
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FUNC(GITMODULES_MISSING, ERROR) \
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FUNC(GITMODULES_BLOB, ERROR) \
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FUNC(GITMODULES_LARGE, ERROR) \
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FUNC(GITMODULES_NAME, ERROR) \
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FUNC(GITMODULES_SYMLINK, ERROR) \
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FUNC(GITMODULES_URL, ERROR) \
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FUNC(GITMODULES_PATH, ERROR) \
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FUNC(GITMODULES_UPDATE, ERROR) \
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/* warnings */ \
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FUNC(BAD_FILEMODE, WARN) \
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FUNC(EMPTY_NAME, WARN) \
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FUNC(FULL_PATHNAME, WARN) \
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FUNC(HAS_DOT, WARN) \
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FUNC(HAS_DOTDOT, WARN) \
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FUNC(HAS_DOTGIT, WARN) \
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FUNC(NULL_SHA1, WARN) \
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FUNC(ZERO_PADDED_FILEMODE, WARN) \
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FUNC(NUL_IN_COMMIT, WARN) \
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/* infos (reported as warnings, but ignored by default) */ \
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FUNC(GITMODULES_PARSE, INFO) \
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FUNC(BAD_TAG_NAME, INFO) \
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FUNC(MISSING_TAGGER_ENTRY, INFO) \
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/* ignored (elevated when requested) */ \
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FUNC(EXTRA_HEADER_ENTRY, IGNORE)
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#define MSG_ID(id, msg_type) FSCK_MSG_##id,
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enum fsck_msg_id {
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FOREACH_MSG_ID(MSG_ID)
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FSCK_MSG_MAX
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};
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#undef MSG_ID
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#define STR(x) #x
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#define MSG_ID(id, msg_type) { STR(id), NULL, NULL, FSCK_##msg_type },
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static struct {
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const char *id_string;
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const char *downcased;
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const char *camelcased;
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int msg_type;
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} msg_id_info[FSCK_MSG_MAX + 1] = {
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FOREACH_MSG_ID(MSG_ID)
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{ NULL, NULL, NULL, -1 }
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};
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#undef MSG_ID
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static void prepare_msg_ids(void)
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{
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int i;
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if (msg_id_info[0].downcased)
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return;
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/* convert id_string to lower case, without underscores. */
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for (i = 0; i < FSCK_MSG_MAX; i++) {
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const char *p = msg_id_info[i].id_string;
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int len = strlen(p);
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char *q = xmalloc(len);
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msg_id_info[i].downcased = q;
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while (*p)
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if (*p == '_')
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p++;
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else
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*(q)++ = tolower(*(p)++);
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*q = '\0';
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p = msg_id_info[i].id_string;
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q = xmalloc(len);
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msg_id_info[i].camelcased = q;
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while (*p) {
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if (*p == '_') {
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p++;
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if (*p)
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*q++ = *p++;
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} else {
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*q++ = tolower(*p++);
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}
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}
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*q = '\0';
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}
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}
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static int parse_msg_id(const char *text)
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{
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int i;
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prepare_msg_ids();
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for (i = 0; i < FSCK_MSG_MAX; i++)
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if (!strcmp(text, msg_id_info[i].downcased))
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return i;
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return -1;
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}
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void list_config_fsck_msg_ids(struct string_list *list, const char *prefix)
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{
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int i;
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prepare_msg_ids();
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for (i = 0; i < FSCK_MSG_MAX; i++)
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list_config_item(list, prefix, msg_id_info[i].camelcased);
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}
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static int fsck_msg_type(enum fsck_msg_id msg_id,
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struct fsck_options *options)
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{
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int msg_type;
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assert(msg_id >= 0 && msg_id < FSCK_MSG_MAX);
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if (options->msg_type)
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msg_type = options->msg_type[msg_id];
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else {
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msg_type = msg_id_info[msg_id].msg_type;
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if (options->strict && msg_type == FSCK_WARN)
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msg_type = FSCK_ERROR;
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}
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return msg_type;
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}
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static int parse_msg_type(const char *str)
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{
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if (!strcmp(str, "error"))
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return FSCK_ERROR;
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else if (!strcmp(str, "warn"))
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return FSCK_WARN;
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else if (!strcmp(str, "ignore"))
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return FSCK_IGNORE;
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else
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die("Unknown fsck message type: '%s'", str);
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}
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int is_valid_msg_type(const char *msg_id, const char *msg_type)
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{
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if (parse_msg_id(msg_id) < 0)
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return 0;
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parse_msg_type(msg_type);
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return 1;
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}
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void fsck_set_msg_type(struct fsck_options *options,
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const char *msg_id, const char *msg_type)
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{
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int id = parse_msg_id(msg_id), type;
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if (id < 0)
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die("Unhandled message id: %s", msg_id);
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type = parse_msg_type(msg_type);
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if (type != FSCK_ERROR && msg_id_info[id].msg_type == FSCK_FATAL)
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die("Cannot demote %s to %s", msg_id, msg_type);
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if (!options->msg_type) {
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int i;
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int *msg_type;
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ALLOC_ARRAY(msg_type, FSCK_MSG_MAX);
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for (i = 0; i < FSCK_MSG_MAX; i++)
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msg_type[i] = fsck_msg_type(i, options);
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options->msg_type = msg_type;
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}
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options->msg_type[id] = type;
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}
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void fsck_set_msg_types(struct fsck_options *options, const char *values)
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{
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char *buf = xstrdup(values), *to_free = buf;
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int done = 0;
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while (!done) {
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int len = strcspn(buf, " ,|"), equal;
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done = !buf[len];
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if (!len) {
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buf++;
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continue;
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}
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buf[len] = '\0';
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for (equal = 0;
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equal < len && buf[equal] != '=' && buf[equal] != ':';
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equal++)
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buf[equal] = tolower(buf[equal]);
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buf[equal] = '\0';
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if (!strcmp(buf, "skiplist")) {
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if (equal == len)
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die("skiplist requires a path");
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oidset_parse_file(&options->skiplist, buf + equal + 1);
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buf += len + 1;
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continue;
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}
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if (equal == len)
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die("Missing '=': '%s'", buf);
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fsck_set_msg_type(options, buf, buf + equal + 1);
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buf += len + 1;
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}
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free(to_free);
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}
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static void append_msg_id(struct strbuf *sb, const char *msg_id)
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{
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for (;;) {
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char c = *(msg_id)++;
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if (!c)
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break;
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if (c != '_')
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strbuf_addch(sb, tolower(c));
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else {
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assert(*msg_id);
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strbuf_addch(sb, *(msg_id)++);
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}
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}
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strbuf_addstr(sb, ": ");
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}
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static int object_on_skiplist(struct fsck_options *opts,
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const struct object_id *oid)
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{
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return opts && oid && oidset_contains(&opts->skiplist, oid);
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}
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__attribute__((format (printf, 5, 6)))
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static int report(struct fsck_options *options,
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const struct object_id *oid, enum object_type object_type,
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enum fsck_msg_id id, const char *fmt, ...)
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{
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va_list ap;
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struct strbuf sb = STRBUF_INIT;
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int msg_type = fsck_msg_type(id, options), result;
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if (msg_type == FSCK_IGNORE)
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return 0;
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if (object_on_skiplist(options, oid))
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return 0;
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if (msg_type == FSCK_FATAL)
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msg_type = FSCK_ERROR;
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else if (msg_type == FSCK_INFO)
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msg_type = FSCK_WARN;
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append_msg_id(&sb, msg_id_info[id].id_string);
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va_start(ap, fmt);
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strbuf_vaddf(&sb, fmt, ap);
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result = options->error_func(options, oid, object_type,
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msg_type, sb.buf);
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strbuf_release(&sb);
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va_end(ap);
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return result;
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}
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void fsck_enable_object_names(struct fsck_options *options)
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{
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if (!options->object_names)
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options->object_names = kh_init_oid_map();
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}
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const char *fsck_get_object_name(struct fsck_options *options,
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const struct object_id *oid)
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{
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khiter_t pos;
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if (!options->object_names)
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return NULL;
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pos = kh_get_oid_map(options->object_names, *oid);
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if (pos >= kh_end(options->object_names))
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return NULL;
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return kh_value(options->object_names, pos);
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}
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void fsck_put_object_name(struct fsck_options *options,
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const struct object_id *oid,
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const char *fmt, ...)
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{
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va_list ap;
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struct strbuf buf = STRBUF_INIT;
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khiter_t pos;
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int hashret;
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if (!options->object_names)
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return;
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pos = kh_put_oid_map(options->object_names, *oid, &hashret);
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if (!hashret)
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return;
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va_start(ap, fmt);
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strbuf_vaddf(&buf, fmt, ap);
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kh_value(options->object_names, pos) = strbuf_detach(&buf, NULL);
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va_end(ap);
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}
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const char *fsck_describe_object(struct fsck_options *options,
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const struct object_id *oid)
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{
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static struct strbuf bufs[] = {
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STRBUF_INIT, STRBUF_INIT, STRBUF_INIT, STRBUF_INIT
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};
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static int b = 0;
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struct strbuf *buf;
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const char *name = fsck_get_object_name(options, oid);
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buf = bufs + b;
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b = (b + 1) % ARRAY_SIZE(bufs);
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strbuf_reset(buf);
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strbuf_addstr(buf, oid_to_hex(oid));
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if (name)
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strbuf_addf(buf, " (%s)", name);
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return buf->buf;
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}
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static int fsck_walk_tree(struct tree *tree, void *data, struct fsck_options *options)
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{
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struct tree_desc desc;
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struct name_entry entry;
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int res = 0;
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const char *name;
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if (parse_tree(tree))
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return -1;
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name = fsck_get_object_name(options, &tree->object.oid);
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if (init_tree_desc_gently(&desc, tree->buffer, tree->size))
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return -1;
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while (tree_entry_gently(&desc, &entry)) {
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struct object *obj;
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int result;
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if (S_ISGITLINK(entry.mode))
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continue;
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if (S_ISDIR(entry.mode)) {
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obj = (struct object *)lookup_tree(the_repository, &entry.oid);
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if (name && obj)
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fsck_put_object_name(options, &entry.oid, "%s%s/",
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name, entry.path);
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result = options->walk(obj, OBJ_TREE, data, options);
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}
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else if (S_ISREG(entry.mode) || S_ISLNK(entry.mode)) {
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obj = (struct object *)lookup_blob(the_repository, &entry.oid);
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if (name && obj)
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fsck_put_object_name(options, &entry.oid, "%s%s",
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name, entry.path);
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result = options->walk(obj, OBJ_BLOB, data, options);
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}
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else {
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result = error("in tree %s: entry %s has bad mode %.6o",
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fsck_describe_object(options, &tree->object.oid),
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entry.path, entry.mode);
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}
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if (result < 0)
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return result;
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if (!res)
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res = result;
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}
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return res;
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}
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static int fsck_walk_commit(struct commit *commit, void *data, struct fsck_options *options)
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{
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int counter = 0, generation = 0, name_prefix_len = 0;
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struct commit_list *parents;
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int res;
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int result;
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const char *name;
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if (parse_commit(commit))
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return -1;
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name = fsck_get_object_name(options, &commit->object.oid);
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if (name)
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fsck_put_object_name(options, get_commit_tree_oid(commit),
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"%s:", name);
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result = options->walk((struct object *)get_commit_tree(commit),
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OBJ_TREE, data, options);
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if (result < 0)
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return result;
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res = result;
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parents = commit->parents;
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if (name && parents) {
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int len = strlen(name), power;
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if (len && name[len - 1] == '^') {
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generation = 1;
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name_prefix_len = len - 1;
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}
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else { /* parse ~<generation> suffix */
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for (generation = 0, power = 1;
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len && isdigit(name[len - 1]);
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power *= 10)
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generation += power * (name[--len] - '0');
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if (power > 1 && len && name[len - 1] == '~')
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name_prefix_len = len - 1;
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else {
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/* Maybe a non-first parent, e.g. HEAD^2 */
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generation = 0;
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name_prefix_len = len;
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}
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}
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}
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while (parents) {
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if (name) {
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struct object_id *oid = &parents->item->object.oid;
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if (counter++)
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fsck_put_object_name(options, oid, "%s^%d",
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name, counter);
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else if (generation > 0)
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fsck_put_object_name(options, oid, "%.*s~%d",
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name_prefix_len, name,
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generation + 1);
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else
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fsck_put_object_name(options, oid, "%s^", name);
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}
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result = options->walk((struct object *)parents->item, OBJ_COMMIT, data, options);
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if (result < 0)
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return result;
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if (!res)
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res = result;
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parents = parents->next;
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}
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return res;
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}
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static int fsck_walk_tag(struct tag *tag, void *data, struct fsck_options *options)
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{
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const char *name = fsck_get_object_name(options, &tag->object.oid);
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if (parse_tag(tag))
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return -1;
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if (name)
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fsck_put_object_name(options, &tag->tagged->oid, "%s", name);
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return options->walk(tag->tagged, OBJ_ANY, data, options);
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}
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int fsck_walk(struct object *obj, void *data, struct fsck_options *options)
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{
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if (!obj)
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return -1;
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if (obj->type == OBJ_NONE)
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parse_object(the_repository, &obj->oid);
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|
|
|
switch (obj->type) {
|
|
case OBJ_BLOB:
|
|
return 0;
|
|
case OBJ_TREE:
|
|
return fsck_walk_tree((struct tree *)obj, data, options);
|
|
case OBJ_COMMIT:
|
|
return fsck_walk_commit((struct commit *)obj, data, options);
|
|
case OBJ_TAG:
|
|
return fsck_walk_tag((struct tag *)obj, data, options);
|
|
default:
|
|
error("Unknown object type for %s",
|
|
fsck_describe_object(options, &obj->oid));
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
struct name_stack {
|
|
const char **names;
|
|
size_t nr, alloc;
|
|
};
|
|
|
|
static void name_stack_push(struct name_stack *stack, const char *name)
|
|
{
|
|
ALLOC_GROW(stack->names, stack->nr + 1, stack->alloc);
|
|
stack->names[stack->nr++] = name;
|
|
}
|
|
|
|
static const char *name_stack_pop(struct name_stack *stack)
|
|
{
|
|
return stack->nr ? stack->names[--stack->nr] : NULL;
|
|
}
|
|
|
|
static void name_stack_clear(struct name_stack *stack)
|
|
{
|
|
FREE_AND_NULL(stack->names);
|
|
stack->nr = stack->alloc = 0;
|
|
}
|
|
|
|
/*
|
|
* 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 is_less_than_slash(unsigned char c)
|
|
{
|
|
return '\0' < c && c < '/';
|
|
}
|
|
|
|
static int verify_ordered(unsigned mode1, const char *name1,
|
|
unsigned mode2, const char *name2,
|
|
struct name_stack *candidates)
|
|
{
|
|
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 = '/';
|
|
|
|
/*
|
|
* There can be non-consecutive duplicates due to the implicitly
|
|
* added slash, e.g.:
|
|
*
|
|
* foo
|
|
* foo.bar
|
|
* foo.bar.baz
|
|
* foo.bar/
|
|
* foo/
|
|
*
|
|
* Record non-directory candidates (like "foo" and "foo.bar" in
|
|
* the example) on a stack and check directory candidates (like
|
|
* foo/" and "foo.bar/") against that stack.
|
|
*/
|
|
if (!c1 && is_less_than_slash(c2)) {
|
|
name_stack_push(candidates, name1);
|
|
} else if (c2 == '/' && is_less_than_slash(c1)) {
|
|
for (;;) {
|
|
const char *p;
|
|
const char *f_name = name_stack_pop(candidates);
|
|
|
|
if (!f_name)
|
|
break;
|
|
if (!skip_prefix(name2, f_name, &p))
|
|
continue;
|
|
if (!*p)
|
|
return TREE_HAS_DUPS;
|
|
if (is_less_than_slash(*p)) {
|
|
name_stack_push(candidates, f_name);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return c1 < c2 ? 0 : TREE_UNORDERED;
|
|
}
|
|
|
|
static int fsck_tree(const struct object_id *oid,
|
|
const char *buffer, unsigned long size,
|
|
struct fsck_options *options)
|
|
{
|
|
int retval = 0;
|
|
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;
|
|
struct name_stack df_dup_candidates = { NULL };
|
|
|
|
if (init_tree_desc_gently(&desc, buffer, size)) {
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
|
|
return retval;
|
|
}
|
|
|
|
o_mode = 0;
|
|
o_name = NULL;
|
|
|
|
while (desc.size) {
|
|
unsigned short mode;
|
|
const char *name, *backslash;
|
|
const struct object_id *oid;
|
|
|
|
oid = tree_entry_extract(&desc, &name, &mode);
|
|
|
|
has_null_sha1 |= is_null_oid(oid);
|
|
has_full_path |= !!strchr(name, '/');
|
|
has_empty_name |= !*name;
|
|
has_dot |= !strcmp(name, ".");
|
|
has_dotdot |= !strcmp(name, "..");
|
|
has_dotgit |= is_hfs_dotgit(name) || is_ntfs_dotgit(name);
|
|
has_zero_pad |= *(char *)desc.buffer == '0';
|
|
|
|
if (is_hfs_dotgitmodules(name) || is_ntfs_dotgitmodules(name)) {
|
|
if (!S_ISLNK(mode))
|
|
oidset_insert(&gitmodules_found, oid);
|
|
else
|
|
retval += report(options,
|
|
oid, OBJ_TREE,
|
|
FSCK_MSG_GITMODULES_SYMLINK,
|
|
".gitmodules is a symbolic link");
|
|
}
|
|
|
|
if ((backslash = strchr(name, '\\'))) {
|
|
while (backslash) {
|
|
backslash++;
|
|
has_dotgit |= is_ntfs_dotgit(backslash);
|
|
if (is_ntfs_dotgitmodules(backslash)) {
|
|
if (!S_ISLNK(mode))
|
|
oidset_insert(&gitmodules_found, oid);
|
|
else
|
|
retval += report(options, oid, OBJ_TREE,
|
|
FSCK_MSG_GITMODULES_SYMLINK,
|
|
".gitmodules is a symbolic link");
|
|
}
|
|
backslash = strchr(backslash, '\\');
|
|
}
|
|
}
|
|
|
|
if (update_tree_entry_gently(&desc)) {
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_TREE, "cannot be parsed as a tree");
|
|
break;
|
|
}
|
|
|
|
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 (!options->strict)
|
|
break;
|
|
/* fallthrough */
|
|
default:
|
|
has_bad_modes = 1;
|
|
}
|
|
|
|
if (o_name) {
|
|
switch (verify_ordered(o_mode, o_name, mode, name,
|
|
&df_dup_candidates)) {
|
|
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;
|
|
}
|
|
|
|
name_stack_clear(&df_dup_candidates);
|
|
|
|
if (has_null_sha1)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_NULL_SHA1, "contains entries pointing to null sha1");
|
|
if (has_full_path)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_FULL_PATHNAME, "contains full pathnames");
|
|
if (has_empty_name)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_EMPTY_NAME, "contains empty pathname");
|
|
if (has_dot)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOT, "contains '.'");
|
|
if (has_dotdot)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOTDOT, "contains '..'");
|
|
if (has_dotgit)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_HAS_DOTGIT, "contains '.git'");
|
|
if (has_zero_pad)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_ZERO_PADDED_FILEMODE, "contains zero-padded file modes");
|
|
if (has_bad_modes)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_BAD_FILEMODE, "contains bad file modes");
|
|
if (has_dup_entries)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_DUPLICATE_ENTRIES, "contains duplicate file entries");
|
|
if (not_properly_sorted)
|
|
retval += report(options, oid, OBJ_TREE, FSCK_MSG_TREE_NOT_SORTED, "not properly sorted");
|
|
return retval;
|
|
}
|
|
|
|
static int verify_headers(const void *data, unsigned long size,
|
|
const struct object_id *oid, enum object_type type,
|
|
struct fsck_options *options)
|
|
{
|
|
const char *buffer = (const char *)data;
|
|
unsigned long i;
|
|
|
|
for (i = 0; i < size; i++) {
|
|
switch (buffer[i]) {
|
|
case '\0':
|
|
return report(options, oid, type,
|
|
FSCK_MSG_NUL_IN_HEADER,
|
|
"unterminated header: NUL at offset %ld", i);
|
|
case '\n':
|
|
if (i + 1 < size && buffer[i + 1] == '\n')
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* We did not find double-LF that separates the header
|
|
* and the body. Not having a body is not a crime but
|
|
* we do want to see the terminating LF for the last header
|
|
* line.
|
|
*/
|
|
if (size && buffer[size - 1] == '\n')
|
|
return 0;
|
|
|
|
return report(options, oid, type,
|
|
FSCK_MSG_UNTERMINATED_HEADER, "unterminated header");
|
|
}
|
|
|
|
static int fsck_ident(const char **ident,
|
|
const struct object_id *oid, enum object_type type,
|
|
struct fsck_options *options)
|
|
{
|
|
const char *p = *ident;
|
|
char *end;
|
|
|
|
*ident = strchrnul(*ident, '\n');
|
|
if (**ident == '\n')
|
|
(*ident)++;
|
|
|
|
if (*p == '<')
|
|
return report(options, oid, type, FSCK_MSG_MISSING_NAME_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
|
|
p += strcspn(p, "<>\n");
|
|
if (*p == '>')
|
|
return report(options, oid, type, FSCK_MSG_BAD_NAME, "invalid author/committer line - bad name");
|
|
if (*p != '<')
|
|
return report(options, oid, type, FSCK_MSG_MISSING_EMAIL, "invalid author/committer line - missing email");
|
|
if (p[-1] != ' ')
|
|
return report(options, oid, type, FSCK_MSG_MISSING_SPACE_BEFORE_EMAIL, "invalid author/committer line - missing space before email");
|
|
p++;
|
|
p += strcspn(p, "<>\n");
|
|
if (*p != '>')
|
|
return report(options, oid, type, FSCK_MSG_BAD_EMAIL, "invalid author/committer line - bad email");
|
|
p++;
|
|
if (*p != ' ')
|
|
return report(options, oid, type, FSCK_MSG_MISSING_SPACE_BEFORE_DATE, "invalid author/committer line - missing space before date");
|
|
p++;
|
|
if (*p == '0' && p[1] != ' ')
|
|
return report(options, oid, type, FSCK_MSG_ZERO_PADDED_DATE, "invalid author/committer line - zero-padded date");
|
|
if (date_overflows(parse_timestamp(p, &end, 10)))
|
|
return report(options, oid, type, FSCK_MSG_BAD_DATE_OVERFLOW, "invalid author/committer line - date causes integer overflow");
|
|
if ((end == p || *end != ' '))
|
|
return report(options, oid, type, FSCK_MSG_BAD_DATE, "invalid author/committer line - bad date");
|
|
p = end + 1;
|
|
if ((*p != '+' && *p != '-') ||
|
|
!isdigit(p[1]) ||
|
|
!isdigit(p[2]) ||
|
|
!isdigit(p[3]) ||
|
|
!isdigit(p[4]) ||
|
|
(p[5] != '\n'))
|
|
return report(options, oid, type, FSCK_MSG_BAD_TIMEZONE, "invalid author/committer line - bad time zone");
|
|
p += 6;
|
|
return 0;
|
|
}
|
|
|
|
static int fsck_commit(const struct object_id *oid,
|
|
const char *buffer, unsigned long size,
|
|
struct fsck_options *options)
|
|
{
|
|
struct object_id tree_oid, parent_oid;
|
|
unsigned author_count;
|
|
int err;
|
|
const char *buffer_begin = buffer;
|
|
const char *p;
|
|
|
|
if (verify_headers(buffer, size, oid, OBJ_COMMIT, options))
|
|
return -1;
|
|
|
|
if (!skip_prefix(buffer, "tree ", &buffer))
|
|
return report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_TREE, "invalid format - expected 'tree' line");
|
|
if (parse_oid_hex(buffer, &tree_oid, &p) || *p != '\n') {
|
|
err = report(options, oid, OBJ_COMMIT, FSCK_MSG_BAD_TREE_SHA1, "invalid 'tree' line format - bad sha1");
|
|
if (err)
|
|
return err;
|
|
}
|
|
buffer = p + 1;
|
|
while (skip_prefix(buffer, "parent ", &buffer)) {
|
|
if (parse_oid_hex(buffer, &parent_oid, &p) || *p != '\n') {
|
|
err = report(options, oid, OBJ_COMMIT, FSCK_MSG_BAD_PARENT_SHA1, "invalid 'parent' line format - bad sha1");
|
|
if (err)
|
|
return err;
|
|
}
|
|
buffer = p + 1;
|
|
}
|
|
author_count = 0;
|
|
while (skip_prefix(buffer, "author ", &buffer)) {
|
|
author_count++;
|
|
err = fsck_ident(&buffer, oid, OBJ_COMMIT, options);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (author_count < 1)
|
|
err = report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_AUTHOR, "invalid format - expected 'author' line");
|
|
else if (author_count > 1)
|
|
err = report(options, oid, OBJ_COMMIT, FSCK_MSG_MULTIPLE_AUTHORS, "invalid format - multiple 'author' lines");
|
|
if (err)
|
|
return err;
|
|
if (!skip_prefix(buffer, "committer ", &buffer))
|
|
return report(options, oid, OBJ_COMMIT, FSCK_MSG_MISSING_COMMITTER, "invalid format - expected 'committer' line");
|
|
err = fsck_ident(&buffer, oid, OBJ_COMMIT, options);
|
|
if (err)
|
|
return err;
|
|
if (memchr(buffer_begin, '\0', size)) {
|
|
err = report(options, oid, OBJ_COMMIT, FSCK_MSG_NUL_IN_COMMIT,
|
|
"NUL byte in the commit object body");
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int fsck_tag(const struct object_id *oid, const char *buffer,
|
|
unsigned long size, struct fsck_options *options)
|
|
{
|
|
struct object_id tagged_oid;
|
|
int tagged_type;
|
|
return fsck_tag_standalone(oid, buffer, size, options, &tagged_oid,
|
|
&tagged_type);
|
|
}
|
|
|
|
int fsck_tag_standalone(const struct object_id *oid, const char *buffer,
|
|
unsigned long size, struct fsck_options *options,
|
|
struct object_id *tagged_oid,
|
|
int *tagged_type)
|
|
{
|
|
int ret = 0;
|
|
char *eol;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
const char *p;
|
|
|
|
ret = verify_headers(buffer, size, oid, OBJ_TAG, options);
|
|
if (ret)
|
|
goto done;
|
|
|
|
if (!skip_prefix(buffer, "object ", &buffer)) {
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_OBJECT, "invalid format - expected 'object' line");
|
|
goto done;
|
|
}
|
|
if (parse_oid_hex(buffer, tagged_oid, &p) || *p != '\n') {
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_BAD_OBJECT_SHA1, "invalid 'object' line format - bad sha1");
|
|
if (ret)
|
|
goto done;
|
|
}
|
|
buffer = p + 1;
|
|
|
|
if (!skip_prefix(buffer, "type ", &buffer)) {
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TYPE_ENTRY, "invalid format - expected 'type' line");
|
|
goto done;
|
|
}
|
|
eol = strchr(buffer, '\n');
|
|
if (!eol) {
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TYPE, "invalid format - unexpected end after 'type' line");
|
|
goto done;
|
|
}
|
|
*tagged_type = type_from_string_gently(buffer, eol - buffer, 1);
|
|
if (*tagged_type < 0)
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_BAD_TYPE, "invalid 'type' value");
|
|
if (ret)
|
|
goto done;
|
|
buffer = eol + 1;
|
|
|
|
if (!skip_prefix(buffer, "tag ", &buffer)) {
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAG_ENTRY, "invalid format - expected 'tag' line");
|
|
goto done;
|
|
}
|
|
eol = strchr(buffer, '\n');
|
|
if (!eol) {
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAG, "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)) {
|
|
ret = report(options, oid, OBJ_TAG,
|
|
FSCK_MSG_BAD_TAG_NAME,
|
|
"invalid 'tag' name: %.*s",
|
|
(int)(eol - buffer), buffer);
|
|
if (ret)
|
|
goto done;
|
|
}
|
|
buffer = eol + 1;
|
|
|
|
if (!skip_prefix(buffer, "tagger ", &buffer)) {
|
|
/* early tags do not contain 'tagger' lines; warn only */
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_MISSING_TAGGER_ENTRY, "invalid format - expected 'tagger' line");
|
|
if (ret)
|
|
goto done;
|
|
}
|
|
else
|
|
ret = fsck_ident(&buffer, oid, OBJ_TAG, options);
|
|
if (!*buffer)
|
|
goto done;
|
|
|
|
if (!starts_with(buffer, "\n")) {
|
|
/*
|
|
* The verify_headers() check will allow
|
|
* e.g. "[...]tagger <tagger>\nsome
|
|
* garbage\n\nmessage" to pass, thinking "some
|
|
* garbage" could be a custom header. E.g. "mktag"
|
|
* doesn't want any unknown headers.
|
|
*/
|
|
ret = report(options, oid, OBJ_TAG, FSCK_MSG_EXTRA_HEADER_ENTRY, "invalid format - extra header(s) after 'tagger'");
|
|
if (ret)
|
|
goto done;
|
|
}
|
|
|
|
done:
|
|
strbuf_release(&sb);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Like builtin/submodule--helper.c's starts_with_dot_slash, but without
|
|
* relying on the platform-dependent is_dir_sep helper.
|
|
*
|
|
* This is for use in checking whether a submodule URL is interpreted as
|
|
* relative to the current directory on any platform, since \ is a
|
|
* directory separator on Windows but not on other platforms.
|
|
*/
|
|
static int starts_with_dot_slash(const char *str)
|
|
{
|
|
return str[0] == '.' && (str[1] == '/' || str[1] == '\\');
|
|
}
|
|
|
|
/*
|
|
* Like starts_with_dot_slash, this is a variant of submodule--helper's
|
|
* helper of the same name with the twist that it accepts backslash as a
|
|
* directory separator even on non-Windows platforms.
|
|
*/
|
|
static int starts_with_dot_dot_slash(const char *str)
|
|
{
|
|
return str[0] == '.' && starts_with_dot_slash(str + 1);
|
|
}
|
|
|
|
static int submodule_url_is_relative(const char *url)
|
|
{
|
|
return starts_with_dot_slash(url) || starts_with_dot_dot_slash(url);
|
|
}
|
|
|
|
/*
|
|
* Count directory components that a relative submodule URL should chop
|
|
* from the remote_url it is to be resolved against.
|
|
*
|
|
* In other words, this counts "../" components at the start of a
|
|
* submodule URL.
|
|
*
|
|
* Returns the number of directory components to chop and writes a
|
|
* pointer to the next character of url after all leading "./" and
|
|
* "../" components to out.
|
|
*/
|
|
static int count_leading_dotdots(const char *url, const char **out)
|
|
{
|
|
int result = 0;
|
|
while (1) {
|
|
if (starts_with_dot_dot_slash(url)) {
|
|
result++;
|
|
url += strlen("../");
|
|
continue;
|
|
}
|
|
if (starts_with_dot_slash(url)) {
|
|
url += strlen("./");
|
|
continue;
|
|
}
|
|
*out = url;
|
|
return result;
|
|
}
|
|
}
|
|
/*
|
|
* Check whether a transport is implemented by git-remote-curl.
|
|
*
|
|
* If it is, returns 1 and writes the URL that would be passed to
|
|
* git-remote-curl to the "out" parameter.
|
|
*
|
|
* Otherwise, returns 0 and leaves "out" untouched.
|
|
*
|
|
* Examples:
|
|
* http::https://example.com/repo.git -> 1, https://example.com/repo.git
|
|
* https://example.com/repo.git -> 1, https://example.com/repo.git
|
|
* git://example.com/repo.git -> 0
|
|
*
|
|
* This is for use in checking for previously exploitable bugs that
|
|
* required a submodule URL to be passed to git-remote-curl.
|
|
*/
|
|
static int url_to_curl_url(const char *url, const char **out)
|
|
{
|
|
/*
|
|
* We don't need to check for case-aliases, "http.exe", and so
|
|
* on because in the default configuration, is_transport_allowed
|
|
* prevents URLs with those schemes from being cloned
|
|
* automatically.
|
|
*/
|
|
if (skip_prefix(url, "http::", out) ||
|
|
skip_prefix(url, "https::", out) ||
|
|
skip_prefix(url, "ftp::", out) ||
|
|
skip_prefix(url, "ftps::", out))
|
|
return 1;
|
|
if (starts_with(url, "http://") ||
|
|
starts_with(url, "https://") ||
|
|
starts_with(url, "ftp://") ||
|
|
starts_with(url, "ftps://")) {
|
|
*out = url;
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int check_submodule_url(const char *url)
|
|
{
|
|
const char *curl_url;
|
|
|
|
if (looks_like_command_line_option(url))
|
|
return -1;
|
|
|
|
if (submodule_url_is_relative(url) || starts_with(url, "git://")) {
|
|
char *decoded;
|
|
const char *next;
|
|
int has_nl;
|
|
|
|
/*
|
|
* This could be appended to an http URL and url-decoded;
|
|
* check for malicious characters.
|
|
*/
|
|
decoded = url_decode(url);
|
|
has_nl = !!strchr(decoded, '\n');
|
|
|
|
free(decoded);
|
|
if (has_nl)
|
|
return -1;
|
|
|
|
/*
|
|
* URLs which escape their root via "../" can overwrite
|
|
* the host field and previous components, resolving to
|
|
* URLs like https::example.com/submodule.git and
|
|
* https:///example.com/submodule.git that were
|
|
* susceptible to CVE-2020-11008.
|
|
*/
|
|
if (count_leading_dotdots(url, &next) > 0 &&
|
|
(*next == ':' || *next == '/'))
|
|
return -1;
|
|
}
|
|
|
|
else if (url_to_curl_url(url, &curl_url)) {
|
|
struct credential c = CREDENTIAL_INIT;
|
|
int ret = 0;
|
|
if (credential_from_url_gently(&c, curl_url, 1) ||
|
|
!*c.host)
|
|
ret = -1;
|
|
credential_clear(&c);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct fsck_gitmodules_data {
|
|
const struct object_id *oid;
|
|
struct fsck_options *options;
|
|
int ret;
|
|
};
|
|
|
|
static int fsck_gitmodules_fn(const char *var, const char *value, void *vdata)
|
|
{
|
|
struct fsck_gitmodules_data *data = vdata;
|
|
const char *subsection, *key;
|
|
size_t subsection_len;
|
|
char *name;
|
|
|
|
if (parse_config_key(var, "submodule", &subsection, &subsection_len, &key) < 0 ||
|
|
!subsection)
|
|
return 0;
|
|
|
|
name = xmemdupz(subsection, subsection_len);
|
|
if (check_submodule_name(name) < 0)
|
|
data->ret |= report(data->options,
|
|
data->oid, OBJ_BLOB,
|
|
FSCK_MSG_GITMODULES_NAME,
|
|
"disallowed submodule name: %s",
|
|
name);
|
|
if (!strcmp(key, "url") && value &&
|
|
check_submodule_url(value) < 0)
|
|
data->ret |= report(data->options,
|
|
data->oid, OBJ_BLOB,
|
|
FSCK_MSG_GITMODULES_URL,
|
|
"disallowed submodule url: %s",
|
|
value);
|
|
if (!strcmp(key, "path") && value &&
|
|
looks_like_command_line_option(value))
|
|
data->ret |= report(data->options,
|
|
data->oid, OBJ_BLOB,
|
|
FSCK_MSG_GITMODULES_PATH,
|
|
"disallowed submodule path: %s",
|
|
value);
|
|
if (!strcmp(key, "update") && value &&
|
|
parse_submodule_update_type(value) == SM_UPDATE_COMMAND)
|
|
data->ret |= report(data->options, data->oid, OBJ_BLOB,
|
|
FSCK_MSG_GITMODULES_UPDATE,
|
|
"disallowed submodule update setting: %s",
|
|
value);
|
|
free(name);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int fsck_blob(const struct object_id *oid, const char *buf,
|
|
unsigned long size, struct fsck_options *options)
|
|
{
|
|
struct fsck_gitmodules_data data;
|
|
struct config_options config_opts = { 0 };
|
|
|
|
if (!oidset_contains(&gitmodules_found, oid))
|
|
return 0;
|
|
oidset_insert(&gitmodules_done, oid);
|
|
|
|
if (object_on_skiplist(options, oid))
|
|
return 0;
|
|
|
|
if (!buf) {
|
|
/*
|
|
* A missing buffer here is a sign that the caller found the
|
|
* blob too gigantic to load into memory. Let's just consider
|
|
* that an error.
|
|
*/
|
|
return report(options, oid, OBJ_BLOB,
|
|
FSCK_MSG_GITMODULES_LARGE,
|
|
".gitmodules too large to parse");
|
|
}
|
|
|
|
data.oid = oid;
|
|
data.options = options;
|
|
data.ret = 0;
|
|
config_opts.error_action = CONFIG_ERROR_SILENT;
|
|
if (git_config_from_mem(fsck_gitmodules_fn, CONFIG_ORIGIN_BLOB,
|
|
".gitmodules", buf, size, &data, &config_opts))
|
|
data.ret |= report(options, oid, OBJ_BLOB,
|
|
FSCK_MSG_GITMODULES_PARSE,
|
|
"could not parse gitmodules blob");
|
|
|
|
return data.ret;
|
|
}
|
|
|
|
int fsck_object(struct object *obj, void *data, unsigned long size,
|
|
struct fsck_options *options)
|
|
{
|
|
if (!obj)
|
|
return report(options, NULL, OBJ_NONE, FSCK_MSG_BAD_OBJECT_SHA1, "no valid object to fsck");
|
|
|
|
if (obj->type == OBJ_BLOB)
|
|
return fsck_blob(&obj->oid, data, size, options);
|
|
if (obj->type == OBJ_TREE)
|
|
return fsck_tree(&obj->oid, data, size, options);
|
|
if (obj->type == OBJ_COMMIT)
|
|
return fsck_commit(&obj->oid, data, size, options);
|
|
if (obj->type == OBJ_TAG)
|
|
return fsck_tag(&obj->oid, data, size, options);
|
|
|
|
return report(options, &obj->oid, obj->type,
|
|
FSCK_MSG_UNKNOWN_TYPE,
|
|
"unknown type '%d' (internal fsck error)",
|
|
obj->type);
|
|
}
|
|
|
|
int fsck_error_function(struct fsck_options *o,
|
|
const struct object_id *oid,
|
|
enum object_type object_type,
|
|
int msg_type, const char *message)
|
|
{
|
|
if (msg_type == FSCK_WARN) {
|
|
warning("object %s: %s", fsck_describe_object(o, oid), message);
|
|
return 0;
|
|
}
|
|
error("object %s: %s", fsck_describe_object(o, oid), message);
|
|
return 1;
|
|
}
|
|
|
|
int fsck_finish(struct fsck_options *options)
|
|
{
|
|
int ret = 0;
|
|
struct oidset_iter iter;
|
|
const struct object_id *oid;
|
|
|
|
oidset_iter_init(&gitmodules_found, &iter);
|
|
while ((oid = oidset_iter_next(&iter))) {
|
|
enum object_type type;
|
|
unsigned long size;
|
|
char *buf;
|
|
|
|
if (oidset_contains(&gitmodules_done, oid))
|
|
continue;
|
|
|
|
buf = read_object_file(oid, &type, &size);
|
|
if (!buf) {
|
|
if (is_promisor_object(oid))
|
|
continue;
|
|
ret |= report(options,
|
|
oid, OBJ_BLOB,
|
|
FSCK_MSG_GITMODULES_MISSING,
|
|
"unable to read .gitmodules blob");
|
|
continue;
|
|
}
|
|
|
|
if (type == OBJ_BLOB)
|
|
ret |= fsck_blob(oid, buf, size, options);
|
|
else
|
|
ret |= report(options,
|
|
oid, type,
|
|
FSCK_MSG_GITMODULES_BLOB,
|
|
"non-blob found at .gitmodules");
|
|
free(buf);
|
|
}
|
|
|
|
|
|
oidset_clear(&gitmodules_found);
|
|
oidset_clear(&gitmodules_done);
|
|
return ret;
|
|
}
|
|
|
|
int fsck_config_internal(const char *var, const char *value, void *cb,
|
|
struct fsck_options *options)
|
|
{
|
|
if (strcmp(var, "fsck.skiplist") == 0) {
|
|
const char *path;
|
|
struct strbuf sb = STRBUF_INIT;
|
|
|
|
if (git_config_pathname(&path, var, value))
|
|
return 1;
|
|
strbuf_addf(&sb, "skiplist=%s", path);
|
|
free((char *)path);
|
|
fsck_set_msg_types(options, sb.buf);
|
|
strbuf_release(&sb);
|
|
return 0;
|
|
}
|
|
|
|
if (skip_prefix(var, "fsck.", &var)) {
|
|
fsck_set_msg_type(options, var, value);
|
|
return 0;
|
|
}
|
|
|
|
return git_default_config(var, value, cb);
|
|
}
|