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author | Li RongQing <lirongqing@baidu.com> | 2020-04-02 10:52:10 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-04-23 11:37:51 +0300 |
commit | 66c70a096e7d36b08ae585fefa21c59b9d81c35c (patch) | |
tree | 459a2723cbe4ed9aa99ecaa3366224627cded302 | |
parent | f47ed954c43f5d39ac99bb23f51325ff1aa58068 (diff) | |
download | linux-66c70a096e7d36b08ae585fefa21c59b9d81c35c.tar.xz |
xsk: Fix out of boundary write in __xsk_rcv_memcpy
commit db5c97f02373917efe2c218ebf8e3d8b19e343b6 upstream.
first_len is the remainder of the first page we're copying.
If this size is larger, then out of page boundary write will
otherwise happen.
Fixes: c05cd3645814 ("xsk: add support to allow unaligned chunk placement")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Jonathan Lemon <jonathan.lemon@gmail.com>
Acked-by: Björn Töpel <bjorn.topel@intel.com>
Link: https://lore.kernel.org/bpf/1585813930-19712-1-git-send-email-lirongqing@baidu.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r-- | net/xdp/xsk.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/net/xdp/xsk.c b/net/xdp/xsk.c index 356f90e4522b..c350108aa38d 100644 --- a/net/xdp/xsk.c +++ b/net/xdp/xsk.c @@ -131,8 +131,9 @@ static void __xsk_rcv_memcpy(struct xdp_umem *umem, u64 addr, void *from_buf, u64 page_start = addr & ~(PAGE_SIZE - 1); u64 first_len = PAGE_SIZE - (addr - page_start); - memcpy(to_buf, from_buf, first_len + metalen); - memcpy(next_pg_addr, from_buf + first_len, len - first_len); + memcpy(to_buf, from_buf, first_len); + memcpy(next_pg_addr, from_buf + first_len, + len + metalen - first_len); return; } |