diff options
Diffstat (limited to 'fs/xfs/libxfs')
| -rw-r--r-- | fs/xfs/libxfs/xfs_attr_leaf.c | 67 |
1 files changed, 65 insertions, 2 deletions
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c index 962319e1e128..56e62b3d9bb7 100644 --- a/fs/xfs/libxfs/xfs_attr_leaf.c +++ b/fs/xfs/libxfs/xfs_attr_leaf.c @@ -233,6 +233,61 @@ xfs_attr3_leaf_hdr_to_disk( } static xfs_failaddr_t +xfs_attr3_leaf_verify_entry( + struct xfs_mount *mp, + char *buf_end, + struct xfs_attr_leafblock *leaf, + struct xfs_attr3_icleaf_hdr *leafhdr, + struct xfs_attr_leaf_entry *ent, + int idx, + __u32 *last_hashval) +{ + struct xfs_attr_leaf_name_local *lentry; + struct xfs_attr_leaf_name_remote *rentry; + char *name_end; + unsigned int nameidx; + unsigned int namesize; + __u32 hashval; + + /* hash order check */ + hashval = be32_to_cpu(ent->hashval); + if (hashval < *last_hashval) + return __this_address; + *last_hashval = hashval; + + nameidx = be16_to_cpu(ent->nameidx); + if (nameidx < leafhdr->firstused || nameidx >= mp->m_attr_geo->blksize) + return __this_address; + + /* + * Check the name information. The namelen fields are u8 so we can't + * possibly exceed the maximum name length of 255 bytes. + */ + if (ent->flags & XFS_ATTR_LOCAL) { + lentry = xfs_attr3_leaf_name_local(leaf, idx); + namesize = xfs_attr_leaf_entsize_local(lentry->namelen, + be16_to_cpu(lentry->valuelen)); + name_end = (char *)lentry + namesize; + if (lentry->namelen == 0) + return __this_address; + } else { + rentry = xfs_attr3_leaf_name_remote(leaf, idx); + namesize = xfs_attr_leaf_entsize_remote(rentry->namelen); + name_end = (char *)rentry + namesize; + if (rentry->namelen == 0) + return __this_address; + if (!(ent->flags & XFS_ATTR_INCOMPLETE) && + rentry->valueblk == 0) + return __this_address; + } + + if (name_end > buf_end) + return __this_address; + + return NULL; +} + +static xfs_failaddr_t xfs_attr3_leaf_verify( struct xfs_buf *bp) { @@ -240,7 +295,10 @@ xfs_attr3_leaf_verify( struct xfs_mount *mp = bp->b_mount; struct xfs_attr_leafblock *leaf = bp->b_addr; struct xfs_attr_leaf_entry *entries; + struct xfs_attr_leaf_entry *ent; + char *buf_end; uint32_t end; /* must be 32bit - see below */ + __u32 last_hashval = 0; int i; xfs_failaddr_t fa; @@ -273,8 +331,13 @@ xfs_attr3_leaf_verify( (char *)bp->b_addr + ichdr.firstused) return __this_address; - /* XXX: need to range check rest of attr header values */ - /* XXX: hash order check? */ + buf_end = (char *)bp->b_addr + mp->m_attr_geo->blksize; + for (i = 0, ent = entries; i < ichdr.count; ent++, i++) { + fa = xfs_attr3_leaf_verify_entry(mp, buf_end, leaf, &ichdr, + ent, i, &last_hashval); + if (fa) + return fa; + } /* * Quickly check the freemap information. Attribute data has to be |