bpf: net: Change sk_getsockopt() to take the sockptr_t argument

This patch changes sk_getsockopt() to take the sockptr_t argument
such that it can be used by bpf_getsockopt(SOL_SOCKET) in a
latter patch.

security_socket_getpeersec_stream() is not changed.  It stays
with the __user ptr (optval.user and optlen.user) to avoid changes
to other security hooks.  bpf_getsockopt(SOL_SOCKET) also does not
support SO_PEERSEC.

Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://lore.kernel.org/r/20220902002802.2888419-1-kafai@fb.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/include/linux/sockptr.h b/include/linux/sockptr.h
index d45902fb4cad..bae5e2369b4f 100644
--- a/include/linux/sockptr.h
+++ b/include/linux/sockptr.h
@@ -64,6 +64,11 @@ static inline int copy_to_sockptr_offset(sockptr_t dst, size_t offset,
 	return 0;
 }
 
+static inline int copy_to_sockptr(sockptr_t dst, const void *src, size_t size)
+{
+	return copy_to_sockptr_offset(dst, 0, src, size);
+}
+
 static inline void *memdup_sockptr(sockptr_t src, size_t len)
 {
 	void *p = kmalloc_track_caller(len, GFP_USER | __GFP_NOWARN);