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https://github.com/systemd/systemd-stable.git
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journal: verify structural consistency
This commit is contained in:
Lennart Poettering
parent
f9fffc31cd
commit
86adf873be
@ -47,12 +47,12 @@ typedef struct FSPRGHeader FSPRGHeader;
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/* Object types */
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enum {
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OBJECT_UNUSED,
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OBJECT_DATA,
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OBJECT_DATA, /* !!! */
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OBJECT_FIELD,
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OBJECT_ENTRY,
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OBJECT_DATA_HASH_TABLE,
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OBJECT_FIELD_HASH_TABLE,
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OBJECT_ENTRY_ARRAY,
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OBJECT_ENTRY_ARRAY, /* !!! */
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OBJECT_TAG,
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_OBJECT_TYPE_MAX
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};
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@ -34,10 +34,11 @@
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/* FIXME:
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*
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* - follow all chains
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* - check for unreferenced objects
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* - verify FSPRG
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* - Allow building without libgcrypt
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* - check with sparse
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* - 64bit conversions
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* - verification should use MAP_PRIVATE
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*
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* */
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@ -110,12 +111,18 @@ static int journal_file_object_verify(JournalFile *f, Object *o) {
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if ((le64toh(o->object.size) - offsetof(HashTableObject, items)) % sizeof(HashItem) != 0)
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return -EBADMSG;
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if ((le64toh(o->object.size) - offsetof(HashTableObject, items)) / sizeof(HashItem) <= 0)
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return -EBADMSG;
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break;
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case OBJECT_ENTRY_ARRAY:
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if ((le64toh(o->object.size) - offsetof(EntryArrayObject, items)) % sizeof(le64_t) != 0)
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return -EBADMSG;
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if ((le64toh(o->object.size) - offsetof(EntryArrayObject, items)) / sizeof(le64_t) <= 0)
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return -EBADMSG;
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break;
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case OBJECT_TAG:
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@ -206,7 +213,7 @@ static int contains_uint64(MMapCache *m, int fd, uint64_t n, uint64_t p) {
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c = (a + b) / 2;
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r = mmap_cache_get(m, fd, PROT_READ, 0, c * sizeof(uint64_t), sizeof(uint64_t), (void **) &z);
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r = mmap_cache_get(m, fd, PROT_READ|PROT_WRITE, 0, c * sizeof(uint64_t), sizeof(uint64_t), (void **) &z);
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if (r < 0)
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return r;
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@ -222,6 +229,368 @@ static int contains_uint64(MMapCache *m, int fd, uint64_t n, uint64_t p) {
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return 0;
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}
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static int entry_points_to_data(
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JournalFile *f,
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int entry_fd,
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uint64_t n_entries,
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uint64_t entry_p,
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uint64_t data_p) {
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int r;
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uint64_t i, n, a;
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Object *o;
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bool found = false;
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assert(f);
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assert(entry_fd >= 0);
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if (!contains_uint64(f->mmap, entry_fd, n_entries, entry_p)) {
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log_error("Data object references invalid entry at %llu", (unsigned long long) data_p);
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return -EBADMSG;
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}
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r = journal_file_move_to_object(f, OBJECT_ENTRY, entry_p, &o);
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if (r < 0)
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return r;
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n = journal_file_entry_n_items(o);
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for (i = 0; i < n; i++)
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if (le64toh(o->entry.items[i].object_offset) == data_p) {
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found = true;
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break;
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}
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if (!found) {
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log_error("Data object not referenced by linked entry at %llu", (unsigned long long) data_p);
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return -EBADMSG;
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}
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/* Check if this entry is also in main entry array. Since the
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* main entry array has already been verified we can rely on
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* its consistency.*/
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n = le64toh(f->header->n_entries);
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a = le64toh(f->header->entry_array_offset);
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i = 0;
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while (i < n) {
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uint64_t m, j;
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r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
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if (r < 0)
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return r;
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m = journal_file_entry_array_n_items(o);
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for (j = 0; i < n && j < m; i++, j++)
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if (le64toh(o->entry_array.items[j]) == entry_p)
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return 0;
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a = le64toh(o->entry_array.next_entry_array_offset);;
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}
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return 0;
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}
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static int verify_data(
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JournalFile *f,
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Object *o, uint64_t p,
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int entry_fd, uint64_t n_entries,
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int entry_array_fd, uint64_t n_entry_arrays) {
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uint64_t i, n, a, last, q;
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int r;
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assert(f);
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assert(o);
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assert(entry_fd >= 0);
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assert(entry_array_fd >= 0);
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n = le64toh(o->data.n_entries);
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a = le64toh(o->data.entry_array_offset);
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/* We already checked this earlier */
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assert(n > 0);
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last = q = le64toh(o->data.entry_offset);
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r = entry_points_to_data(f, entry_fd, n_entries, q, p);
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if (r < 0)
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return r;
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while (i < n) {
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uint64_t next, m, j;
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if (a == 0) {
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log_error("Array chain too short at %llu.", (unsigned long long) p);
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return -EBADMSG;
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}
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if (!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, a)) {
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log_error("Invalid array at %llu.", (unsigned long long) p);
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return -EBADMSG;
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}
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r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
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if (r < 0)
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return r;
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next = le64toh(o->entry_array.next_entry_array_offset);
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if (next != 0 && next <= a) {
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log_error("Array chain has cycle at %llu.", (unsigned long long) p);
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return -EBADMSG;
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}
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m = journal_file_entry_array_n_items(o);
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for (j = 0; i < n && j < m; i++, j++) {
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q = le64toh(o->entry_array.items[j]);
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if (q <= last) {
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log_error("Data object's entry array not sorted at %llu.", (unsigned long long) p);
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return -EBADMSG;
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}
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last = q;
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r = entry_points_to_data(f, entry_fd, n_entries, q, p);
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if (r < 0)
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return r;
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/* Pointer might have moved, reposition */
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r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
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if (r < 0)
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return r;
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}
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a = next;
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}
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return 0;
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}
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static int verify_hash_table(
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JournalFile *f,
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int data_fd, uint64_t n_data,
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int entry_fd, uint64_t n_entries,
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int entry_array_fd, uint64_t n_entry_arrays,
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usec_t *last_usec) {
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uint64_t i, n;
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int r;
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assert(f);
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assert(data_fd >= 0);
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assert(entry_fd >= 0);
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assert(entry_array_fd >= 0);
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assert(last_usec);
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n = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
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for (i = 0; i < n; i++) {
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uint64_t last = 0, p;
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draw_progress(0xC000 + (0x3FFF * i / n), last_usec);
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p = le64toh(f->data_hash_table[i].head_hash_offset);
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while (p != 0) {
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Object *o;
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uint64_t next;
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if (!contains_uint64(f->mmap, data_fd, n_data, p)) {
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log_error("Invalid data object at hash entry %llu of %llu.",
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(unsigned long long) i, (unsigned long long) n);
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return -EBADMSG;
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}
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r = journal_file_move_to_object(f, OBJECT_DATA, p, &o);
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if (r < 0)
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return r;
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next = le64toh(o->data.next_hash_offset);
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if (next != 0 && next <= p) {
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log_error("Hash chain has a cycle in hash entry %llu of %llu.",
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(unsigned long long) i, (unsigned long long) n);
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return -EBADMSG;
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}
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if (le64toh(o->data.hash) % n != i) {
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log_error("Hash value mismatch in hash entry %llu of %llu.",
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(unsigned long long) i, (unsigned long long) n);
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return -EBADMSG;
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}
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r = verify_data(f, o, p, entry_fd, n_entries, entry_array_fd, n_entry_arrays);
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if (r < 0)
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return r;
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last = p;
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p = next;
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}
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if (last != le64toh(f->data_hash_table[i].tail_hash_offset)) {
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log_error("Tail hash pointer mismatch in hash table.");
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return -EBADMSG;
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}
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}
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return 0;
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}
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static int data_object_in_hash_table(JournalFile *f, uint64_t hash, uint64_t p) {
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uint64_t n, h, q;
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int r;
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assert(f);
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n = le64toh(f->header->data_hash_table_size) / sizeof(HashItem);
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h = hash % n;
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q = le64toh(f->data_hash_table[h].head_hash_offset);
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while (q != 0) {
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Object *o;
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if (p == q)
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return 1;
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r = journal_file_move_to_object(f, OBJECT_DATA, q, &o);
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if (r < 0)
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return r;
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q = le64toh(o->data.next_hash_offset);
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}
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return 0;
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}
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static int verify_entry(
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JournalFile *f,
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Object *o, uint64_t p,
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int data_fd, uint64_t n_data) {
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uint64_t i, n;
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int r;
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assert(f);
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assert(o);
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assert(data_fd >= 0);
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n = journal_file_entry_n_items(o);
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for (i = 0; i < n; i++) {
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uint64_t q, h;
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Object *u;
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q = le64toh(o->entry.items[i].object_offset);
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h = le64toh(o->entry.items[i].hash);
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if (!contains_uint64(f->mmap, data_fd, n_data, q)) {
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log_error("Invalid data object at entry %llu.",
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(unsigned long long) o);
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return -EBADMSG;
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}
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r = journal_file_move_to_object(f, OBJECT_DATA, q, &u);
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if (r < 0)
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return r;
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if (le64toh(u->data.hash) != h) {
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log_error("Hash mismatch for data object at entry %llu.",
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(unsigned long long) p);
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return -EBADMSG;
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}
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r = data_object_in_hash_table(f, h, q);
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if (r < 0)
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return r;
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if (r == 0) {
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log_error("Data object missing from hash at entry %llu.",
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(unsigned long long) p);
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return -EBADMSG;
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}
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}
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return 0;
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}
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static int verify_entry_array(
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JournalFile *f,
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int data_fd, uint64_t n_data,
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int entry_fd, uint64_t n_entries,
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int entry_array_fd, uint64_t n_entry_arrays,
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usec_t *last_usec) {
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uint64_t i = 0, a, n, last = 0;
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int r;
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assert(f);
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assert(data_fd >= 0);
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assert(entry_fd >= 0);
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assert(entry_array_fd >= 0);
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assert(last_usec);
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n = le64toh(f->header->n_entries);
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a = le64toh(f->header->entry_array_offset);
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while (i < n) {
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uint64_t next, m, j;
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Object *o;
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draw_progress(0x8000 + (0x3FFF * i / n), last_usec);
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if (a == 0) {
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log_error("Array chain too short at %llu of %llu.",
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(unsigned long long) i, (unsigned long long) n);
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return -EBADMSG;
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}
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if (!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, a)) {
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log_error("Invalid array at %llu of %llu.",
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(unsigned long long) i, (unsigned long long) n);
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return -EBADMSG;
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}
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r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
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if (r < 0)
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return r;
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next = le64toh(o->entry_array.next_entry_array_offset);
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if (next != 0 && next <= a) {
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log_error("Array chain has cycle at %llu of %llu.",
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(unsigned long long) i, (unsigned long long) n);
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return -EBADMSG;
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}
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m = journal_file_entry_array_n_items(o);
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for (j = 0; i < n && j < m; i++, j++) {
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uint64_t p;
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p = le64toh(o->entry_array.items[j]);
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if (p <= last) {
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log_error("Entry array not sorted at %llu of %llu.",
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(unsigned long long) i, (unsigned long long) n);
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return -EBADMSG;
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}
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last = p;
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if (!contains_uint64(f->mmap, entry_fd, n_entries, p)) {
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log_error("Invalid array entry at %llu of %llu.",
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(unsigned long long) i, (unsigned long long) n);
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return -EBADMSG;
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}
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r = journal_file_move_to_object(f, OBJECT_ENTRY, p, &o);
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if (r < 0)
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return r;
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r = verify_entry(f, o, p, data_fd, n_data);
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if (r < 0)
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return r;
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/* Pointer might have moved, reposition */
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r = journal_file_move_to_object(f, OBJECT_ENTRY_ARRAY, a, &o);
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if (r < 0)
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return r;
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}
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a = next;
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}
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return 0;
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}
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int journal_file_verify(JournalFile *f, const char *key) {
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int r;
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Object *o;
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@ -270,7 +639,7 @@ int journal_file_verify(JournalFile *f, const char *key) {
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p = le64toh(f->header->header_size);
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while (p != 0) {
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draw_progress((0x7FFF * p) / le64toh(f->header->tail_object_offset), &last_usec);
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draw_progress(0x7FFF * p / le64toh(f->header->tail_object_offset), &last_usec);
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r = journal_file_move_to_object(f, -1, p, &o);
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if (r < 0) {
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@ -504,53 +873,29 @@ int journal_file_verify(JournalFile *f, const char *key) {
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goto fail;
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}
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/* Second iteration: we go through all objects again, this
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* time verify all pointers. */
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/* Second iteration: we follow all objects referenced from the
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* two entry points: the object hash table and the entry
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* array. We also check that everything referenced (directly
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* or indirectly) in the data hash table also exists in the
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* entry array, and vice versa. Note that we do not care for
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* unreferenced objects. We only care that everything that is
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* referenced is consistent. */
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p = le64toh(f->header->header_size);
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while (p != 0) {
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draw_progress(0x8000 + (0x7FFF * p) / le64toh(f->header->tail_object_offset), &last_usec);
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r = journal_file_move_to_object(f, -1, p, &o);
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if (r < 0) {
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log_error("Invalid object at %llu", (unsigned long long) p);
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r = verify_entry_array(f,
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data_fd, n_data,
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entry_fd, n_entries,
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entry_array_fd, n_entry_arrays,
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&last_usec);
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if (r < 0)
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goto fail;
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}
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if (o->object.type == OBJECT_ENTRY_ARRAY) {
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uint64_t i = 0, n;
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if (le64toh(o->entry_array.next_entry_array_offset) != 0 &&
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!contains_uint64(f->mmap, entry_array_fd, n_entry_arrays, le64toh(o->entry_array.next_entry_array_offset))) {
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log_error("Entry array chains up to invalid next array at %llu", (unsigned long long) p);
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r = -EBADMSG;
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r = verify_hash_table(f,
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data_fd, n_data,
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entry_fd, n_entries,
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entry_array_fd, n_entry_arrays,
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&last_usec);
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if (r < 0)
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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;
|
||||
}
|
||||
|
||||
if (p == le64toh(f->header->tail_object_offset))
|
||||
p = 0;
|
||||
else
|
||||
p = p + ALIGN64(le64toh(o->object.size));
|
||||
}
|
||||
|
||||
flush_progress();
|
||||
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user