From: "Darrick J. Wong" djwong@kernel.org
commit ea0b3e814741fb64e7785b564ea619578058e0b0 upstream.
[backport: fix conflicts due to various xattr refactoring]
Create a standardized helper function to enforce one namespace bit per extended attribute, and refactor all the open-coded hweight logic. This function is not a static inline to avoid porting hassles in userspace.
Signed-off-by: Darrick J. Wong djwong@kernel.org Reviewed-by: Christoph Hellwig hch@lst.de Signed-off-by: Catherine Hoang catherine.hoang@oracle.com Acked-by: Darrick J. Wong djwong@kernel.org --- fs/xfs/libxfs/xfs_attr.c | 11 +++++++++++ fs/xfs/libxfs/xfs_attr.h | 4 +++- fs/xfs/libxfs/xfs_attr_leaf.c | 6 +++++- fs/xfs/scrub/attr.c | 12 +++++------- fs/xfs/xfs_attr_item.c | 10 ++++++++-- fs/xfs/xfs_attr_list.c | 11 +++++++---- 6 files changed, 39 insertions(+), 15 deletions(-)
diff --git a/fs/xfs/libxfs/xfs_attr.c b/fs/xfs/libxfs/xfs_attr.c index 32d350e97e0f..33edf047e0ad 100644 --- a/fs/xfs/libxfs/xfs_attr.c +++ b/fs/xfs/libxfs/xfs_attr.c @@ -1565,12 +1565,23 @@ xfs_attr_node_get( return error; }
+/* Enforce that there is at most one namespace bit per attr. */ +inline bool xfs_attr_check_namespace(unsigned int attr_flags) +{ + return hweight32(attr_flags & XFS_ATTR_NSP_ONDISK_MASK) < 2; +} + /* Returns true if the attribute entry name is valid. */ bool xfs_attr_namecheck( + unsigned int attr_flags, const void *name, size_t length) { + /* Only one namespace bit allowed. */ + if (!xfs_attr_check_namespace(attr_flags)) + return false; + /* * MAXNAMELEN includes the trailing null, but (name/length) leave it * out, so use >= for the length check. diff --git a/fs/xfs/libxfs/xfs_attr.h b/fs/xfs/libxfs/xfs_attr.h index 81be9b3e4004..c877f05e3cd1 100644 --- a/fs/xfs/libxfs/xfs_attr.h +++ b/fs/xfs/libxfs/xfs_attr.h @@ -547,7 +547,9 @@ 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_check_namespace(unsigned int attr_flags); +bool xfs_attr_namecheck(unsigned int attr_flags, const void *name, + size_t length); 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_attr_leaf.c b/fs/xfs/libxfs/xfs_attr_leaf.c index 2580ae47209a..51ff44068675 100644 --- a/fs/xfs/libxfs/xfs_attr_leaf.c +++ b/fs/xfs/libxfs/xfs_attr_leaf.c @@ -984,6 +984,10 @@ xfs_attr_shortform_to_leaf( nargs.hashval = xfs_da_hashname(sfe->nameval, sfe->namelen); nargs.attr_filter = sfe->flags & XFS_ATTR_NSP_ONDISK_MASK; + if (!xfs_attr_check_namespace(sfe->flags)) { + error = -EFSCORRUPTED; + goto out; + } error = xfs_attr3_leaf_lookup_int(bp, &nargs); /* set a->index */ ASSERT(error == -ENOATTR); error = xfs_attr3_leaf_add(bp, &nargs); @@ -1105,7 +1109,7 @@ xfs_attr_shortform_verify( * one namespace flag per xattr, so we can just count the * bits (i.e. hweight) here. */ - if (hweight8(sfep->flags & XFS_ATTR_NSP_ONDISK_MASK) > 1) + if (!xfs_attr_check_namespace(sfep->flags)) return __this_address;
sfep = next_sfep; diff --git a/fs/xfs/scrub/attr.c b/fs/xfs/scrub/attr.c index 419968d5f5cb..7cb0af5e34b1 100644 --- a/fs/xfs/scrub/attr.c +++ b/fs/xfs/scrub/attr.c @@ -193,14 +193,8 @@ xchk_xattr_listent( return; }
- /* Only one namespace bit allowed. */ - if (hweight32(flags & XFS_ATTR_NSP_ONDISK_MASK) > 1) { - xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK, args.blkno); - goto fail_xref; - } - /* Does this name make sense? */ - if (!xfs_attr_namecheck(name, namelen)) { + if (!xfs_attr_namecheck(flags, name, namelen)) { xchk_fblock_set_corrupt(sx->sc, XFS_ATTR_FORK, args.blkno); goto fail_xref; } @@ -501,6 +495,10 @@ xchk_xattr_rec( xchk_da_set_corrupt(ds, level); return 0; } + if (!xfs_attr_check_namespace(ent->flags)) { + xchk_da_set_corrupt(ds, level); + return 0; + }
if (ent->flags & XFS_ATTR_LOCAL) { lentry = (struct xfs_attr_leaf_name_local *) diff --git a/fs/xfs/xfs_attr_item.c b/fs/xfs/xfs_attr_item.c index 141631b0d64c..df86c9c09720 100644 --- a/fs/xfs/xfs_attr_item.c +++ b/fs/xfs/xfs_attr_item.c @@ -522,6 +522,10 @@ xfs_attri_validate( if (attrp->alfi_attr_filter & ~XFS_ATTRI_FILTER_MASK) return false;
+ if (!xfs_attr_check_namespace(attrp->alfi_attr_filter & + XFS_ATTR_NSP_ONDISK_MASK)) + return false; + /* alfi_op_flags should be either a set or remove */ switch (op) { case XFS_ATTRI_OP_FLAGS_SET: @@ -572,7 +576,8 @@ 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(attrp->alfi_attr_filter, nv->name.i_addr, + nv->name.i_len)) return -EFSCORRUPTED;
error = xlog_recover_iget(mp, attrp->alfi_ino, &ip); @@ -772,7 +777,8 @@ 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(attri_formatp->alfi_attr_filter, attr_name, + attri_formatp->alfi_name_len)) { XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp, attri_formatp, len); return -EFSCORRUPTED; diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c index 99bbbe1a0e44..9ee1d7d2ba76 100644 --- a/fs/xfs/xfs_attr_list.c +++ b/fs/xfs/xfs_attr_list.c @@ -82,7 +82,8 @@ 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, + !xfs_attr_namecheck(sfe->flags, + sfe->nameval, sfe->namelen))) return -EFSCORRUPTED; context->put_listent(context, @@ -120,7 +121,8 @@ xfs_attr_shortform_list( for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) { if (unlikely( ((char *)sfe < (char *)sf) || - ((char *)sfe >= ((char *)sf + dp->i_af.if_bytes)))) { + ((char *)sfe >= ((char *)sf + dp->i_af.if_bytes)) || + !xfs_attr_check_namespace(sfe->flags))) { XFS_CORRUPTION_ERROR("xfs_attr_shortform_list", XFS_ERRLEVEL_LOW, context->dp->i_mount, sfe, @@ -174,7 +176,7 @@ xfs_attr_shortform_list( cursor->offset = 0; } if (XFS_IS_CORRUPT(context->dp->i_mount, - !xfs_attr_namecheck(sbp->name, + !xfs_attr_namecheck(sbp->flags, sbp->name, sbp->namelen))) { error = -EFSCORRUPTED; goto out; @@ -465,7 +467,8 @@ xfs_attr3_leaf_list_int( }
if (XFS_IS_CORRUPT(context->dp->i_mount, - !xfs_attr_namecheck(name, namelen))) + !xfs_attr_namecheck(entry->flags, name, + namelen))) return -EFSCORRUPTED; context->put_listent(context, entry->flags, name, namelen, valuelen);