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xfs: Validate the length of on-disk ACLs 

In xfs_acl_from_disk, instead of trusting that xfs_acl.acl_cnt is correct,
make sure that the length of the attributes is correct as well.  Also, turn
the aclp parameter into a const pointer.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Andreas Gruenbacher 2015-11-03 12:41:59 +11:00 committed by Dave Chinner
parent 67d8e04e34
commit 86a21c7974
2 changed files with 14 additions and 7 deletions
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8
fs/xfs/libxfs/xfs_format.h
View File

@ -1487,9 +1487,13 @@ struct xfs_acl {
sizeof(struct xfs_acl_entry) \
: 25)
#define XFS_ACL_MAX_SIZE(mp) \
#define XFS_ACL_SIZE(cnt) \
(sizeof(struct xfs_acl) + \
sizeof(struct xfs_acl_entry) * XFS_ACL_MAX_ENTRIES((mp)))
sizeof(struct xfs_acl_entry) * cnt)
#define XFS_ACL_MAX_SIZE(mp) \
XFS_ACL_SIZE(XFS_ACL_MAX_ENTRIES((mp)))
/* On-disk XFS extended attribute names */
#define SGI_ACL_FILE "SGI_ACL_FILE"

13
fs/xfs/xfs_acl.c
View File

@ -37,16 +37,19 @@
STATIC struct posix_acl *
xfs_acl_from_disk(
struct xfs_acl *aclp,
int max_entries)
const struct xfs_acl *aclp,
int len,
int max_entries)
{
struct posix_acl_entry *acl_e;
struct posix_acl *acl;
struct xfs_acl_entry *ace;
const struct xfs_acl_entry *ace;
unsigned int count, i;
if (len < sizeof(*aclp))
return ERR_PTR(-EFSCORRUPTED);
count = be32_to_cpu(aclp->acl_cnt);
if (count > max_entries)
if (count > max_entries || XFS_ACL_SIZE(count) != len)
return ERR_PTR(-EFSCORRUPTED);
acl = posix_acl_alloc(count, GFP_KERNEL);
@ -163,7 +166,7 @@ xfs_get_acl(struct inode *inode, int type)
goto out;
}
acl = xfs_acl_from_disk(xfs_acl, XFS_ACL_MAX_ENTRIES(ip->i_mount));
acl = xfs_acl_from_disk(xfs_acl, len, XFS_ACL_MAX_ENTRIES(ip->i_mount));
if (IS_ERR(acl))
goto out;