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xfs: reject unknown xattri log item filter flags during recovery

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Make sure we screen the "attr flags" field of recovered xattr intent log
items to reject flag bits that we don't know about.  This is really the
attr *filter* field from xfs_da_args, so rename the field and create
a mask to make checking for invalid bits easier.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Allison Henderson <allison.henderson@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Darrick J. Wong 2022-05-20 14:42:15 +10:00 committed by Dave Chinner
parent 356cb708ea
commit 85d76aec6b
2 changed files with 16 additions and 4 deletions
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10
fs/xfs/libxfs/xfs_log_format.h
View File

@ -911,6 +911,14 @@ struct xfs_icreate_log {
#define XFS_ATTR_OP_FLAGS_REPLACE 3 /* Replace the attribute */
#define XFS_ATTR_OP_FLAGS_TYPE_MASK 0xFF /* Flags type mask */
/*
* alfi_attr_filter captures the state of xfs_da_args.attr_filter, so it should
* never have any other bits set.
*/
#define XFS_ATTRI_FILTER_MASK (XFS_ATTR_ROOT | \
XFS_ATTR_SECURE | \
XFS_ATTR_INCOMPLETE)
/*
* This is the structure used to lay out an attr log item in the
* log.
@ -924,7 +932,7 @@ struct xfs_attri_log_format {
uint32_t alfi_op_flags; /* marks the op as a set or remove */
uint32_t alfi_name_len; /* attr name length */
uint32_t alfi_value_len; /* attr value length */
uint32_t alfi_attr_flags;/* attr flags */
uint32_t alfi_attr_filter;/* attr filter flags */
};
struct xfs_attrd_log_format {

10
fs/xfs/xfs_attr_item.c
View File

@ -353,7 +353,8 @@ xfs_attr_log_item(
attrp->alfi_op_flags = attr->xattri_op_flags;
attrp->alfi_value_len = attr->xattri_da_args->valuelen;
attrp->alfi_name_len = attr->xattri_da_args->namelen;
attrp->alfi_attr_flags = attr->xattri_da_args->attr_filter;
ASSERT(!(attr->xattri_da_args->attr_filter & ~XFS_ATTRI_FILTER_MASK));
attrp->alfi_attr_filter = attr->xattri_da_args->attr_filter;
memcpy(attrip->attri_name, attr->xattri_da_args->name,
attr->xattri_da_args->namelen);
@ -500,6 +501,9 @@ xfs_attri_validate(
if (attrp->alfi_op_flags & ~XFS_ATTR_OP_FLAGS_TYPE_MASK)
return false;
if (attrp->alfi_attr_filter & ~XFS_ATTRI_FILTER_MASK)
return false;
/* alfi_op_flags should be either a set or remove */
switch (op) {
case XFS_ATTR_OP_FLAGS_SET:
@ -569,7 +573,7 @@ xfs_attri_item_recover(
args->name = attrip->attri_name;
args->namelen = attrp->alfi_name_len;
args->hashval = xfs_da_hashname(args->name, args->namelen);
args->attr_filter = attrp->alfi_attr_flags;
args->attr_filter = attrp->alfi_attr_filter & XFS_ATTRI_FILTER_MASK;
args->op_flags = XFS_DA_OP_RECOVERY | XFS_DA_OP_OKNOENT;
switch (attr->xattri_op_flags) {
@ -658,7 +662,7 @@ xfs_attri_item_relog(
new_attrp->alfi_op_flags = old_attrp->alfi_op_flags;
new_attrp->alfi_value_len = old_attrp->alfi_value_len;
new_attrp->alfi_name_len = old_attrp->alfi_name_len;
new_attrp->alfi_attr_flags = old_attrp->alfi_attr_flags;
new_attrp->alfi_attr_filter = old_attrp->alfi_attr_filter;
memcpy(new_attrip->attri_name, old_attrip->attri_name,
new_attrip->attri_name_len);