Björn Töpel 2b1667e54c xsk: Fix number of pinned pages/umem size discrepancy ... For AF_XDP sockets, there was a discrepancy between the number of of pinned pages and the size of the umem region. The size of the umem region is used to validate the AF_XDP descriptor addresses. The logic that pinned the pages covered by the region only took whole pages into consideration, creating a mismatch between the size and pinned pages. A user could then pass AF_XDP addresses outside the range of pinned pages, but still within the size of the region, crashing the kernel. This change correctly calculates the number of pages to be pinned. Further, the size check for the aligned mode is simplified. Now the code simply checks if the size is divisible by the chunk size. Fixes: bbff2f321a ("xsk: new descriptor addressing scheme") Reported-by: Ciara Loftus <ciara.loftus@intel.com> Signed-off-by: Björn Töpel <bjorn.topel@intel.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Tested-by: Ciara Loftus <ciara.loftus@intel.com> Acked-by: Song Liu <songliubraving@fb.com> Link: https://lore.kernel.org/bpf/20200910075609.7904-1-bjorn.topel@gmail.com		2020-09-14 18:35:09 -07:00
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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	xsk: Fix number of pinned pages/umem size discrepancy	2020-09-14 18:35:09 -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