From: Allison Henderson <allison.hender...@oracle.com> Attribute names of parent pointers are not strings. So we need to modify attr_namecheck to verify parent pointer records when the XFS_ATTR_PARENT flag is set.
Signed-off-by: Allison Henderson <allison.hender...@oracle.com> Reviewed-by: Darrick J. Wong <djw...@kernel.org> --- fs/xfs/libxfs/xfs_attr.c | 47 ++++++++++++++++++++++++++++++++--- fs/xfs/libxfs/xfs_attr.h | 3 ++- fs/xfs/libxfs/xfs_da_format.h | 8 ++++++ fs/xfs/scrub/attr.c | 2 +- fs/xfs/xfs_attr_item.c | 11 +++++--- fs/xfs/xfs_attr_list.c | 17 +++++++++---- 6 files changed, 74 insertions(+), 14 deletions(-) diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c index 101823772bf9..711022742e34 100644 --- a/fs/xfs/libxfs/xfs_attr.c +++ b/fs/xfs/libxfs/xfs_attr.c @@ -1577,9 +1577,33 @@ xfs_attr_node_get( return error; } -/* Returns true if the attribute entry name is valid. */ -bool -xfs_attr_namecheck( +/* + * Verify parent pointer attribute is valid. + * Return true on success or false on failure + */ +STATIC bool +xfs_verify_pptr( + struct xfs_mount *mp, + const struct xfs_parent_name_rec *rec) +{ + xfs_ino_t p_ino; + xfs_dir2_dataptr_t p_diroffset; + + p_ino = be64_to_cpu(rec->p_ino); + p_diroffset = be32_to_cpu(rec->p_diroffset); + + if (!xfs_verify_ino(mp, p_ino)) + return false; + + if (p_diroffset > XFS_DIR2_MAX_DATAPTR) + return false; + + return true; +} + +/* Returns true if the string attribute entry name is valid. */ +static bool +xfs_str_attr_namecheck( const void *name, size_t length) { @@ -1594,6 +1618,23 @@ xfs_attr_namecheck( return !memchr(name, 0, length); } +/* Returns true if the attribute entry name is valid. */ +bool +xfs_attr_namecheck( + struct xfs_mount *mp, + const void *name, + size_t length, + int flags) +{ + if (flags & XFS_ATTR_PARENT) { + if (length != sizeof(struct xfs_parent_name_rec)) + return false; + return xfs_verify_pptr(mp, (struct xfs_parent_name_rec *)name); + } + + return xfs_str_attr_namecheck(name, length); +} + int __init xfs_attr_intent_init_cache(void) { diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h index 3e81f3f48560..b79dae788cfb 100644 --- a/fs/xfs/libxfs/xfs_attr.h +++ b/fs/xfs/libxfs/xfs_attr.h @@ -547,7 +547,8 @@ int xfs_attr_get(struct xfs_da_args *args); int xfs_attr_set(struct xfs_da_args *args); int xfs_attr_set_iter(struct xfs_attr_intent *attr); int xfs_attr_remove_iter(struct xfs_attr_intent *attr); -bool xfs_attr_namecheck(const void *name, size_t length); +bool xfs_attr_namecheck(struct xfs_mount *mp, const void *name, size_t length, + int flags); int xfs_attr_calc_size(struct xfs_da_args *args, int *local); void xfs_init_attr_trans(struct xfs_da_args *args, struct xfs_trans_res *tres, unsigned int *total); diff --git a/fs/xfs/libxfs/xfs_da_format.h b/fs/xfs/libxfs/xfs_da_format.h index b02b67f1999e..75b13807145d 100644 --- a/fs/xfs/libxfs/xfs_da_format.h +++ b/fs/xfs/libxfs/xfs_da_format.h @@ -731,6 +731,14 @@ xfs_attr3_leaf_name(xfs_attr_leafblock_t *leafp, int idx) return &((char *)leafp)[be16_to_cpu(entries[idx].nameidx)]; } +static inline int +xfs_attr3_leaf_flags(xfs_attr_leafblock_t *leafp, int idx) +{ + struct xfs_attr_leaf_entry *entries = xfs_attr3_leaf_entryp(leafp); + + return entries[idx].flags; +} + static inline xfs_attr_leaf_name_remote_t * xfs_attr3_leaf_name_remote(xfs_attr_leafblock_t *leafp, int idx) { diff --git a/fs/xfs/scrub/attr.c b/fs/xfs/scrub/attr.c index 9d2e33743ecd..2a79a13cb600 100644 --- a/fs/xfs/scrub/attr.c +++ b/fs/xfs/scrub/attr.c @@ -129,7 +129,7 @@ xchk_xattr_listent( } /* Does this name make sense? */ - if (!xfs_attr_namecheck(name, namelen)) { + if (!xfs_attr_namecheck(sx->sc->mp, name, namelen, flags)) { xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK, args.blkno); return; } diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c index 95e9ecbb4a67..da807f286a09 100644 --- a/fs/xfs/xfs_attr_item.c +++ b/fs/xfs/xfs_attr_item.c @@ -593,7 +593,8 @@ xfs_attri_item_recover( */ attrp = &attrip->attri_format; if (!xfs_attri_validate(mp, attrp) || - !xfs_attr_namecheck(nv->name.i_addr, nv->name.i_len)) + !xfs_attr_namecheck(mp, nv->name.i_addr, nv->name.i_len, + attrp->alfi_attr_filter)) return -EFSCORRUPTED; error = xlog_recover_iget(mp, attrp->alfi_ino, &ip); @@ -804,7 +805,8 @@ xlog_recover_attri_commit_pass2( } attr_name = item->ri_buf[i].i_addr; - if (!xfs_attr_namecheck(attr_name, attri_formatp->alfi_name_len)) { + if (!xfs_attr_namecheck(mp, attr_name, attri_formatp->alfi_name_len, + attri_formatp->alfi_attr_filter)) { XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, item->ri_buf[i].i_addr, item->ri_buf[i].i_len); return -EFSCORRUPTED; @@ -822,8 +824,9 @@ xlog_recover_attri_commit_pass2( } attr_nname = item->ri_buf[i].i_addr; - if (!xfs_attr_namecheck(attr_nname, - attri_formatp->alfi_nname_len)) { + if (!xfs_attr_namecheck(mp, attr_nname, + attri_formatp->alfi_nname_len, + attri_formatp->alfi_attr_filter)) { XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, item->ri_buf[i].i_addr, item->ri_buf[i].i_len); diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c index 99bbbe1a0e44..a51f7f13a352 100644 --- a/fs/xfs/xfs_attr_list.c +++ b/fs/xfs/xfs_attr_list.c @@ -58,9 +58,13 @@ xfs_attr_shortform_list( struct xfs_attr_sf_sort *sbuf, *sbp; struct xfs_attr_shortform *sf; struct xfs_attr_sf_entry *sfe; + struct xfs_mount *mp; int sbsize, nsbuf, count, i; int error = 0; + ASSERT(context != NULL); + ASSERT(dp != NULL); + mp = dp->i_mount; sf = (struct xfs_attr_shortform *)dp->i_af.if_u1.if_data; ASSERT(sf != NULL); if (!sf->hdr.count) @@ -82,8 +86,9 @@ xfs_attr_shortform_list( (dp->i_af.if_bytes + sf->hdr.count * 16) < context->bufsize)) { for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) { if (XFS_IS_CORRUPT(context->dp->i_mount, - !xfs_attr_namecheck(sfe->nameval, - sfe->namelen))) + !xfs_attr_namecheck(mp, sfe->nameval, + sfe->namelen, + sfe->flags))) return -EFSCORRUPTED; context->put_listent(context, sfe->flags, @@ -174,8 +179,9 @@ xfs_attr_shortform_list( cursor->offset = 0; } if (XFS_IS_CORRUPT(context->dp->i_mount, - !xfs_attr_namecheck(sbp->name, - sbp->namelen))) { + !xfs_attr_namecheck(mp, sbp->name, + sbp->namelen, + sbp->flags))) { error = -EFSCORRUPTED; goto out; } @@ -465,7 +471,8 @@ xfs_attr3_leaf_list_int( } if (XFS_IS_CORRUPT(context->dp->i_mount, - !xfs_attr_namecheck(name, namelen))) + !xfs_attr_namecheck(mp, name, namelen, + entry->flags))) return -EFSCORRUPTED; context->put_listent(context, entry->flags, name, namelen, valuelen); -- 2.38.4