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

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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>
This commit is contained in:
Martin KaFai Lau 2022-09-01 17:28:02 -07:00 • committed by Alexei Starovoitov
parent ba74a7608d
commit 4ff09db1b7
4 changed files with 32 additions and 24 deletions
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3
include/linux/filter.h
View file

@ -900,8 +900,7 @@ int sk_reuseport_attach_filter(struct sock_fprog *fprog, struct sock *sk);
int sk_reuseport_attach_bpf(u32 ufd, struct sock *sk);
void sk_reuseport_prog_free(struct bpf_prog *prog);
int sk_detach_filter(struct sock *sk);
int sk_get_filter(struct sock *sk, struct sock_filter __user *filter,
unsigned int len);
int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len);
bool sk_filter_charge(struct sock *sk, struct sk_filter *fp);
void sk_filter_uncharge(struct sock *sk, struct sk_filter *fp);

5
include/linux/sockptr.h
View file

@ -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);