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-rw-r--r--src/journal/journal-verify.c445
1 files changed, 395 insertions, 50 deletions
diff --git a/src/journal/journal-verify.c b/src/journal/journal-verify.c
index 1a9a73092e..7c99d44838 100644
--- a/src/journal/journal-verify.c
+++ b/src/journal/journal-verify.c
@@ -34,10 +34,11 @@
/* FIXME:
*
- * - follow all chains
- * - check for unreferenced objects
* - verify FSPRG
* - Allow building without libgcrypt
+ * - check with sparse
+ * - 64bit conversions
+ * - verification should use MAP_PRIVATE
*
* */
@@ -110,12 +111,18 @@ static int journal_file_object_verify(JournalFile *f, Object *o) {
if ((le64toh(o->object.size) - offsetof(HashTableObject, items)) % sizeof(HashItem) != 0)
return -EBADMSG;
+ if ((le64toh(o->object.size) - offsetof(HashTableObject, items)) / sizeof(HashItem) <= 0)
+ return -EBADMSG;
+
break;
case OBJECT_ENTRY_ARRAY:
if ((le64toh(o->object.size) - offsetof(EntryArrayObject, items)) % sizeof(le64_t) != 0)
return -EBADMSG;
+ if ((le64toh(o->object.size) - offsetof(EntryArrayObject, items)) / sizeof(le64_t) <= 0)
+ return -EBADMSG;
+
break;
case OBJECT_TAG:
@@ -206,7 +213,7 @@ static int contains_uint64(MMapCache *m, int fd, uint64_t n, uint64_t p) {
c = (a + b) / 2;
- r = mmap_cache_get(m, fd, PROT_READ, 0, c * sizeof(uint64_t), sizeof(uint64_t), (void **) &z);
+ r = mmap_cache_get(m, fd, PROT_READ|PROT_WRITE, 0, c * sizeof(uint64_t), sizeof(uint64_t), (void **) &z);
if (r < 0)
return r;
@@ -222,6 +229,368 @@ static int contains_uint64(MMapCache *m, int fd, uint64_t n, uint64_t p) {
return 0;
}
+static int entry_points_to_data(
+ JournalFile *f,
+ int entry_fd,
+ uint64_t n_entries,
+ uint64_t entry_p,
+ uint64_t data_p) {
+
+ int r;
+ uint64_t i, n, a;
+ Object *o;
+ bool found = false;
+
+ assert(f);
+ assert(entry_fd >= 0);
+
+ if (!contains_uint64(f->mmap, entry_fd, n_entries, entry_p)) {
+ log_error("Data object references invalid entry at %llu", (unsigned long long) data_p);
+ return -EBADMSG;
+ }
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, entry_p, &o);
+ if (r < 0)
+ return r;
+
+ n = journal_file_entry_n_items(o);
+ for (i = 0; i < n; i++)
+ if (le64toh(o->entry.items[i].object_offset) == data_p) {
+ found = true;
+ break;
+ }
+
+ if (!found) {
+ log_error("Data object not referenced by linked entry at %llu", (unsigned long long) data_p);
+ return -EBADMSG;
+ }
+
+ /* Check if this entry is also in main entry array. Since the
+ * main entry array has already been verified we can rely on
+ * its consistency.*/
+
+ n = le64toh(f->header->n_entries);
+ a = le64toh(f->header->entry_array_offset);
+ i = 0;
+
+ while (i < n) {
+ uint64_t m, j;
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
+ if (r < 0)
+ return r;
+
+ m = journal_file_entry_array_n_items(o);
+ for (j = 0; i < n && j < m; i++, j++)
+ if (le64toh(o->entry_array.items[j]) == entry_p)
+ return 0;
+
+ a = le64toh(o->entry_array.next_entry_array_offset);;
+ }
+
+ return 0;
+}
+
+static int verify_data(
+ JournalFile *f,
+ Object *o, uint64_t p,
+ int entry_fd, uint64_t n_entries,
+ int entry_array_fd, uint64_t n_entry_arrays) {
+
+ uint64_t i, n, a, last, q;
+ int r;
+
+ assert(f);
+ assert(o);
+ assert(entry_fd >= 0);
+ assert(entry_array_fd >= 0);
+
+ n = le64toh(o->data.n_entries);
+ a = le64toh(o->data.entry_array_offset);
+
+ /* We already checked this earlier */
+ assert(n > 0);
+
+ last = q = le64toh(o->data.entry_offset);
+ r = entry_points_to_data(f, entry_fd, n_entries, q, p);
+ if (r < 0)
+ return r;
+
+ while (i < n) {
+ uint64_t next, m, j;
+
+ if (a == 0) {
+ log_error("Array chain too short at %llu.", (unsigned long long) p);
+ return -EBADMSG;
+ }
+
+ if (!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, a)) {
+ log_error("Invalid array at %llu.", (unsigned long long) p);
+ return -EBADMSG;
+ }
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
+ if (r < 0)
+ return r;
+
+ next = le64toh(o->entry_array.next_entry_array_offset);
+ if (next != 0 && next <= a) {
+ log_error("Array chain has cycle at %llu.", (unsigned long long) p);
+ return -EBADMSG;
+ }
+
+ m = journal_file_entry_array_n_items(o);
+ for (j = 0; i < n && j < m; i++, j++) {
+
+ q = le64toh(o->entry_array.items[j]);
+ if (q <= last) {
+ log_error("Data object's entry array not sorted at %llu.", (unsigned long long) p);
+ return -EBADMSG;
+ }
+ last = q;
+
+ r = entry_points_to_data(f, entry_fd, n_entries, q, p);
+ if (r < 0)
+ return r;
+
+ /* Pointer might have moved, reposition */
+ r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
+ if (r < 0)
+ return r;
+ }
+
+ a = next;
+ }
+
+ return 0;
+}
+
+static int verify_hash_table(
+ JournalFile *f,
+ int data_fd, uint64_t n_data,
+ int entry_fd, uint64_t n_entries,
+ int entry_array_fd, uint64_t n_entry_arrays,
+ usec_t *last_usec) {
+
+ uint64_t i, n;
+ int r;
+
+ assert(f);
+ assert(data_fd >= 0);
+ assert(entry_fd >= 0);
+ assert(entry_array_fd >= 0);
+ assert(last_usec);
+
+ n = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
+ for (i = 0; i < n; i++) {
+ uint64_t last = 0, p;
+
+ draw_progress(0xC000 + (0x3FFF * i / n), last_usec);
+
+ p = le64toh(f->data_hash_table[i].head_hash_offset);
+ while (p != 0) {
+ Object *o;
+ uint64_t next;
+
+ if (!contains_uint64(f->mmap, data_fd, n_data, p)) {
+ log_error("Invalid data object at hash entry %llu of %llu.",
+ (unsigned long long) i, (unsigned long long) n);
+ return -EBADMSG;
+ }
+
+ r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
+ if (r < 0)
+ return r;
+
+ next = le64toh(o->data.next_hash_offset);
+ if (next != 0 && next <= p) {
+ log_error("Hash chain has a cycle in hash entry %llu of %llu.",
+ (unsigned long long) i, (unsigned long long) n);
+ return -EBADMSG;
+ }
+
+ if (le64toh(o->data.hash) % n != i) {
+ log_error("Hash value mismatch in hash entry %llu of %llu.",
+ (unsigned long long) i, (unsigned long long) n);
+ return -EBADMSG;
+ }
+
+ r = verify_data(f, o, p, entry_fd, n_entries, entry_array_fd, n_entry_arrays);
+ if (r < 0)
+ return r;
+
+ last = p;
+ p = next;
+ }
+
+ if (last != le64toh(f->data_hash_table[i].tail_hash_offset)) {
+ log_error("Tail hash pointer mismatch in hash table.");
+ return -EBADMSG;
+ }
+ }
+
+ return 0;
+}
+
+static int data_object_in_hash_table(JournalFile *f, uint64_t hash, uint64_t p) {
+ uint64_t n, h, q;
+ int r;
+ assert(f);
+
+ n = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
+ h = hash % n;
+
+ q = le64toh(f->data_hash_table[h].head_hash_offset);
+ while (q != 0) {
+ Object *o;
+
+ if (p == q)
+ return 1;
+
+ r = journal_file_move_to_object(f, OBJECT_DATA, q, &o);
+ if (r < 0)
+ return r;
+
+ q = le64toh(o->data.next_hash_offset);
+ }
+
+ return 0;
+}
+
+static int verify_entry(
+ JournalFile *f,
+ Object *o, uint64_t p,
+ int data_fd, uint64_t n_data) {
+
+ uint64_t i, n;
+ int r;
+
+ assert(f);
+ assert(o);
+ assert(data_fd >= 0);
+
+ n = journal_file_entry_n_items(o);
+ for (i = 0; i < n; i++) {
+ uint64_t q, h;
+ Object *u;
+
+ q = le64toh(o->entry.items[i].object_offset);
+ h = le64toh(o->entry.items[i].hash);
+
+ if (!contains_uint64(f->mmap, data_fd, n_data, q)) {
+ log_error("Invalid data object at entry %llu.",
+ (unsigned long long) o);
+ return -EBADMSG;
+ }
+
+ r = journal_file_move_to_object(f, OBJECT_DATA, q, &u);
+ if (r < 0)
+ return r;
+
+ if (le64toh(u->data.hash) != h) {
+ log_error("Hash mismatch for data object at entry %llu.",
+ (unsigned long long) p);
+ return -EBADMSG;
+ }
+
+ r = data_object_in_hash_table(f, h, q);
+ if (r < 0)
+ return r;
+ if (r == 0) {
+ log_error("Data object missing from hash at entry %llu.",
+ (unsigned long long) p);
+ return -EBADMSG;
+ }
+ }
+
+ return 0;
+}
+
+static int verify_entry_array(
+ JournalFile *f,
+ int data_fd, uint64_t n_data,
+ int entry_fd, uint64_t n_entries,
+ int entry_array_fd, uint64_t n_entry_arrays,
+ usec_t *last_usec) {
+
+ uint64_t i = 0, a, n, last = 0;
+ int r;
+
+ assert(f);
+ assert(data_fd >= 0);
+ assert(entry_fd >= 0);
+ assert(entry_array_fd >= 0);
+ assert(last_usec);
+
+ n = le64toh(f->header->n_entries);
+ a = le64toh(f->header->entry_array_offset);
+ while (i < n) {
+ uint64_t next, m, j;
+ Object *o;
+
+ draw_progress(0x8000 + (0x3FFF * i / n), last_usec);
+
+ if (a == 0) {
+ log_error("Array chain too short at %llu of %llu.",
+ (unsigned long long) i, (unsigned long long) n);
+ return -EBADMSG;
+ }
+
+ if (!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, a)) {
+ log_error("Invalid array at %llu of %llu.",
+ (unsigned long long) i, (unsigned long long) n);
+ return -EBADMSG;
+ }
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
+ if (r < 0)
+ return r;
+
+ next = le64toh(o->entry_array.next_entry_array_offset);
+ if (next != 0 && next <= a) {
+ log_error("Array chain has cycle at %llu of %llu.",
+ (unsigned long long) i, (unsigned long long) n);
+ return -EBADMSG;
+ }
+
+ m = journal_file_entry_array_n_items(o);
+ for (j = 0; i < n && j < m; i++, j++) {
+ uint64_t p;
+
+ p = le64toh(o->entry_array.items[j]);
+ if (p <= last) {
+ log_error("Entry array not sorted at %llu of %llu.",
+ (unsigned long long) i, (unsigned long long) n);
+ return -EBADMSG;
+ }
+ last = p;
+
+ if (!contains_uint64(f->mmap, entry_fd, n_entries, p)) {
+ log_error("Invalid array entry at %llu of %llu.",
+ (unsigned long long) i, (unsigned long long) n);
+ return -EBADMSG;
+ }
+
+ r = journal_file_move_to_object(f, OBJECT_ENTRY, p, &o);
+ if (r < 0)
+ return r;
+
+ r = verify_entry(f, o, p, data_fd, n_data);
+ if (r < 0)
+ return r;
+
+ /* Pointer might have moved, reposition */
+ r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
+ if (r < 0)
+ return r;
+ }
+
+ a = next;
+ }
+
+ return 0;
+}
+
int journal_file_verify(JournalFile *f, const char *key) {
int r;
Object *o;
@@ -270,7 +639,7 @@ int journal_file_verify(JournalFile *f, const char *key) {
p = le64toh(f->header->header_size);
while (p != 0) {
- draw_progress((0x7FFF * p) / le64toh(f->header->tail_object_offset), &last_usec);
+ draw_progress(0x7FFF * p / le64toh(f->header->tail_object_offset), &last_usec);
r = journal_file_move_to_object(f, -1, p, &o);
if (r < 0) {
@@ -504,53 +873,29 @@ int journal_file_verify(JournalFile *f, const char *key) {
goto fail;
}
- /* Second iteration: we go through all objects again, this
- * time verify all pointers. */
-
- p = le64toh(f->header->header_size);
- while (p != 0) {
- draw_progress(0x8000 + (0x7FFF * p) / le64toh(f->header->tail_object_offset), &last_usec);
-
- r = journal_file_move_to_object(f, -1, p, &o);
- if (r < 0) {
- log_error("Invalid object at %llu", (unsigned long long) p);
- goto fail;
- }
-
- if (o->object.type == OBJECT_ENTRY_ARRAY) {
- uint64_t i = 0, n;
-
- if (le64toh(o->entry_array.next_entry_array_offset) != 0 &&
- !contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, le64toh(o->entry_array.next_entry_array_offset))) {
- log_error("Entry array chains up to invalid next array at %llu", (unsigned long long) p);
- r = -EBADMSG;
- goto fail;
- }
-
- n = journal_file_entry_array_n_items(o);
- for (i = 0; i < n; i++) {
- if (le64toh(o->entry_array.items[i]) != 0 &&
- !contains_uint64(f->mmap, entry_fd, n_entries, le64toh(o->entry_array.items[i]))) {
-
- log_error("Entry array points to invalid next array at %llu", (unsigned long long) p);
- r = -EBADMSG;
- goto fail;
- }
- }
-
- }
-
- r = journal_file_move_to_object(f, -1, p, &o);
- if (r < 0) {
- log_error("Invalid object at %llu", (unsigned long long) p);
- goto fail;
- }
+ /* Second iteration: we follow all objects referenced from the
+ * two entry points: the object hash table and the entry
+ * array. We also check that everything referenced (directly
+ * or indirectly) in the data hash table also exists in the
+ * entry array, and vice versa. Note that we do not care for
+ * unreferenced objects. We only care that everything that is
+ * referenced is consistent. */
+
+ r = verify_entry_array(f,
+ data_fd, n_data,
+ entry_fd, n_entries,
+ entry_array_fd, n_entry_arrays,
+ &last_usec);
+ if (r < 0)
+ goto fail;
- if (p == le64toh(f->header->tail_object_offset))
- p = 0;
- else
- p = p + ALIGN64(le64toh(o->object.size));
- }
+ r = verify_hash_table(f,
+ data_fd, n_data,
+ entry_fd, n_entries,
+ entry_array_fd, n_entry_arrays,
+ &last_usec);
+ if (r < 0)
+ goto fail;
flush_progress();
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-10 08:18:07 +0000