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bpfilter: reject kernel addresses

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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>
This commit is contained in:
Christoph Hellwig 2020-07-23 08:08:45 +02:00 committed by David S. Miller
parent c9ffebdde8
commit d200cf624c
1 changed files with 4 additions and 0 deletions
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4
net/bpfilter/bpfilter_kern.c
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@ -70,6 +70,10 @@ static int bpfilter_process_sockopt(struct sock *sk, int optname,
.addr = (uintptr_t)optval, .addr = (uintptr_t)optval,
.len = optlen, .len = optlen,
}; };
if (uaccess_kernel()) {
pr_err("kernel access not supported\n");
return -EFAULT;
}
return bpfilter_send_req(&req); return bpfilter_send_req(&req);
} }