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authorDarrick J. Wong <darrick.wong@oracle.com>2019-07-28 21:12:32 -0700
committerDarrick J. Wong <darrick.wong@oracle.com>2019-07-28 21:12:32 -0700
commit2e616d9f9ce8d469db4cd0a019cdc2ff3feab577 (patch)
treec9032b3e27c6e6acb57ec51248468b7b66c8aae0 /fs
parent609488bc979f99f805f34e9a32c1e3b71179d10b (diff)
downloadlinux-2e616d9f9ce8d469db4cd0a019cdc2ff3feab577.tar.bz2
xfs: fix stack contents leakage in the v1 inumber ioctls
Explicitly initialize the onstack structures to zero so we don't leak kernel memory into userspace when converting the in-core inumbers structure to the v1 inogrp ioctl structure. Add a comment about why we have to use memset to ensure that the padding holes in the structures are set to zero. Fixes: 5f19c7fc6873351 ("xfs: introduce v5 inode group structure") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Eric Sandeen <sandeen@redhat.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/xfs/xfs_itable.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index a8a06bb78ea8..f5c955d35be4 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -272,6 +272,7 @@ xfs_bulkstat_to_bstat(
struct xfs_bstat *bs1,
const struct xfs_bulkstat *bstat)
{
+ /* memset is needed here because of padding holes in the structure. */
memset(bs1, 0, sizeof(struct xfs_bstat));
bs1->bs_ino = bstat->bs_ino;
bs1->bs_mode = bstat->bs_mode;
@@ -388,6 +389,8 @@ xfs_inumbers_to_inogrp(
struct xfs_inogrp *ig1,
const struct xfs_inumbers *ig)
{
+ /* memset is needed here because of padding holes in the structure. */
+ memset(ig1, 0, sizeof(struct xfs_inogrp));
ig1->xi_startino = ig->xi_startino;
ig1->xi_alloccount = ig->xi_alloccount;
ig1->xi_allocmask = ig->xi_allocmask;