Commit d200cf62 authored Jul 23, 2020 by Christoph Hellwig Committed by David S. Miller Jul 24, 2020

bpfilter: reject kernel addresses



The bpfilter user mode helper processes the optval address using
process_vm_readv.  Don't send it kernel addresses fed under
set_fs(KERNEL_DS) as that won't work.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent c9ffebdd

net/bpfilter/bpfilter_kern.c

+4 −0

Original line number	Diff line number	Diff line
		@@ -70,6 +70,10 @@ static int bpfilter_process_sockopt(struct sock *sk, int optname,
		.addr = (uintptr_t)optval,
		.len = optlen,
		};
		if (uaccess_kernel()) {
		pr_err("kernel access not supported\n");
		return -EFAULT;
		}
		return bpfilter_send_req(&req);
		}

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