jbd2: checksum data blocks that are stored in the journal

[firefly-linux-kernel-4.4.55.git] / fs / jbd2 / recovery.c

diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index df4a20e7d854e51add551ea2990b675c64a0d9a9..0131e4362534c4d5b83273130ee292463ec49f07 100644 (file)
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -393,6 +393,23 @@ static int jbd2_commit_block_csum_verify(journal_t *j, void *buf)
        return provided == calculated;
 }
 
+static int jbd2_block_tag_csum_verify(journal_t *j, journal_block_tag_t *tag,
+                                     void *buf, __u32 sequence)
+{
+       __u32 provided, calculated;
+
+       if (!JBD2_HAS_INCOMPAT_FEATURE(j, JBD2_FEATURE_INCOMPAT_CSUM_V2))
+               return 1;
+
+       sequence = cpu_to_be32(sequence);
+       calculated = jbd2_chksum(j, j->j_csum_seed, (__u8 *)&sequence,
+                                sizeof(sequence));
+       calculated = jbd2_chksum(j, calculated, buf, j->j_blocksize);
+       provided = be32_to_cpu(tag->t_checksum);
+
+       return provided == cpu_to_be32(calculated);
+}
+
 static int do_one_pass(journal_t *journal,
                        struct recovery_info *info, enum passtype pass)
 {
@@ -569,6 +586,19 @@ static int do_one_pass(journal_t *journal,
                                                goto skip_write;
                                        }
 
+                                       /* Look for block corruption */
+                                       if (!jbd2_block_tag_csum_verify(
+                                               journal, tag, obh->b_data,
+                                               be32_to_cpu(tmp->h_sequence))) {
+                                               brelse(obh);
+                                               success = -EIO;
+                                               printk(KERN_ERR "JBD: Invalid "
+                                                      "checksum recovering "
+                                                      "block %llu in log\n",
+                                                      blocknr);
+                                               continue;
+                                       }
+
                                        /* Find a buffer for the new
                                         * data being restored */
                                        nbh = __getblk(journal->j_fs_dev,