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authorChristoph Hellwig <hch@lst.de>2020-07-23 08:08:45 +0200
committerDavid S. Miller <davem@davemloft.net>2020-07-24 15:41:53 -0700
commitd200cf624c9247ab52b67d34d9e198262a23df31 (patch)
tree7eb16c965917dd917b545cccfc5a4d1fff1854d6 /net/bpfilter
parentc9ffebdde8deccf9ea3a7a97bcd84de0a35ddad7 (diff)
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>
Diffstat (limited to 'net/bpfilter')
-rw-r--r--net/bpfilter/bpfilter_kern.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/net/bpfilter/bpfilter_kern.c b/net/bpfilter/bpfilter_kern.c
index 78d561f2c54d..00540457e5f4 100644
--- a/net/bpfilter/bpfilter_kern.c
+++ b/net/bpfilter/bpfilter_kern.c
@@ -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);
}