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authorPeilin Ye <yepeilin.cs@gmail.com>2020-07-28 08:36:04 +0300
committerDaniel Borkmann <daniel@iogearbox.net>2020-07-28 13:50:15 +0300
commit3c4f850e8441ac8b3b6dbaa6107604c4199ef01f (patch)
treee71a1c747f21c9b1da813dbca97c10c61fbe071f /net/xdp
parentf6dfbe31e8fa5cbd5bc89df9d7f0fa0af7e69981 (diff)
downloadlinux-3c4f850e8441ac8b3b6dbaa6107604c4199ef01f.tar.xz
xdp: Prevent kernel-infoleak in xsk_getsockopt()
xsk_getsockopt() is copying uninitialized stack memory to userspace when 'extra_stats' is 'false'. Fix it. Doing '= {};' is sufficient since currently 'struct xdp_statistics' is defined as follows: struct xdp_statistics { __u64 rx_dropped; __u64 rx_invalid_descs; __u64 tx_invalid_descs; __u64 rx_ring_full; __u64 rx_fill_ring_empty_descs; __u64 tx_ring_empty_descs; }; When being copied to the userspace, 'stats' will not contain any uninitialized 'holes' between struct fields. Fixes: 8aa5a33578e9 ("xsk: Add new statistics") Suggested-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Peilin Ye <yepeilin.cs@gmail.com> Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Acked-by: Björn Töpel <bjorn.topel@intel.com> Acked-by: Song Liu <songliubraving@fb.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/bpf/20200728053604.404631-1-yepeilin.cs@gmail.com
Diffstat (limited to 'net/xdp')
-rw-r--r--net/xdp/xsk.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c
index 2e94a7e94671..c3231620d210 100644
--- a/net/xdp/xsk.c
+++ b/net/xdp/xsk.c
@@ -840,7 +840,7 @@ static int xsk_getsockopt(struct socket *sock, int level, int optname,
switch (optname) {
case XDP_STATISTICS:
{
- struct xdp_statistics stats;
+ struct xdp_statistics stats = {};
bool extra_stats = true;
size_t stats_size;