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xfs: fix kernel memory exposure problems

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Fix a memory exposure problems in inumbers where we allocate an array of
structures with holes, fail to zero the holes, then blindly copy the
kernel memory contents (junk and all) into userspace.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2017-04-03 12:22:39 -07:00
parent 3dd09d5a85
commit bf9216f922
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_itable.c
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@ -583,7 +583,7 @@ xfs_inumbers(
return error;
bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
buffer = kmem_zalloc(bcount * sizeof(*buffer), KM_SLEEP);
do {
struct xfs_inobt_rec_incore r;
int stat;