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linux/net/xdp
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Peilin Ye 3c4f850e84 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: 8aa5a33578 ("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
History 2020-07-28 12:50:15 +02:00
..
Kconfig treewide: Add SPDX license identifier - Makefile/Kconfig 2019-05-21 10:50:46 +02:00
Makefile xsk: Introduce AF_XDP buffer allocation API 2020-05-21 17:31:26 -07:00
xdp_umem.c mmap locking API: use coccinelle to convert mmap_sem rwsem call sites 2020-06-09 09:39:14 -07:00
xdp_umem.h xsk: Move driver interface to xdp_sock_drv.h 2020-05-21 17:31:26 -07:00
xsk.c xdp: Prevent kernel-infoleak in xsk_getsockopt() 2020-07-28 12:50:15 +02:00
xsk.h xsk: Move defines only used by AF_XDP internals to xsk.h 2020-05-21 17:31:26 -07:00
xsk_buff_pool.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next 2020-07-13 18:04:05 -07:00
xsk_diag.c xsk: Add xdp statistics to xsk_diag 2020-07-13 15:32:56 -07:00
xsk_queue.c xsk: Remove MEM_TYPE_ZERO_COPY and corresponding code 2020-05-21 17:31:27 -07:00
xsk_queue.h xsk: Add new statistics 2020-07-13 15:32:56 -07:00
xskmap.c bpf: Set map_btf_{name, id} for all map types 2020-06-22 22:22:58 +02:00