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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);

5
net/core/filter.c
View File

@ -10716,8 +10716,7 @@ int sk_detach_filter(struct sock *sk)
}
EXPORT_SYMBOL_GPL(sk_detach_filter);
int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
unsigned int len)
int sk_get_filter(struct sock *sk, sockptr_t optval, unsigned int len)
{
struct sock_fprog_kern *fprog;
struct sk_filter *filter;
@ -10748,7 +10747,7 @@ int sk_get_filter(struct sock *sk, struct sock_filter __user *ubuf,
goto out;
ret = -EFAULT;
if (copy_to_user(ubuf, fprog->filter, bpf_classic_proglen(fprog)))
if (copy_to_sockptr(optval, fprog->filter, bpf_classic_proglen(fprog)))
goto out;
/* Instead of bytes, the API requests to return the number

43
net/core/sock.c
View File

@ -712,8 +712,8 @@ out:
return ret;
}
static int sock_getbindtodevice(struct sock *sk, char __user *optval,
int __user *optlen, int len)
static int sock_getbindtodevice(struct sock *sk, sockptr_t optval,
sockptr_t optlen, int len)
{
int ret = -ENOPROTOOPT;
#ifdef CONFIG_NETDEVICES
@ -737,12 +737,12 @@ static int sock_getbindtodevice(struct sock *sk, char __user *optval,
len = strlen(devname) + 1;
ret = -EFAULT;
if (copy_to_user(optval, devname, len))
if (copy_to_sockptr(optval, devname, len))
goto out;
zero:
ret = -EFAULT;
if (put_user(len, optlen))
if (copy_to_sockptr(optlen, &len, sizeof(int)))
goto out;
ret = 0;
@ -1568,20 +1568,23 @@ static void cred_to_ucred(struct pid *pid, const struct cred *cred,
}
}
static int groups_to_user(gid_t __user *dst, const struct group_info *src)
static int groups_to_user(sockptr_t dst, const struct group_info *src)
{
struct user_namespace *user_ns = current_user_ns();
int i;
for (i = 0; i < src->ngroups; i++)
if (put_user(from_kgid_munged(user_ns, src->gid[i]), dst + i))
for (i = 0; i < src->ngroups; i++) {
gid_t gid = from_kgid_munged(user_ns, src->gid[i]);
if (copy_to_sockptr_offset(dst, i * sizeof(gid), &gid, sizeof(gid)))
return -EFAULT;
}
return 0;
}
static int sk_getsockopt(struct sock *sk, int level, int optname,
char __user *optval, int __user *optlen)
sockptr_t optval, sockptr_t optlen)
{
struct socket *sock = sk->sk_socket;
@ -1600,7 +1603,7 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
int lv = sizeof(int);
int len;
if (get_user(len, optlen))
if (copy_from_sockptr(&len, optlen, sizeof(int)))
return -EFAULT;
if (len < 0)
return -EINVAL;
@ -1735,7 +1738,7 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
cred_to_ucred(sk->sk_peer_pid, sk->sk_peer_cred, &peercred);
spin_unlock(&sk->sk_peer_lock);
if (copy_to_user(optval, &peercred, len))
if (copy_to_sockptr(optval, &peercred, len))
return -EFAULT;
goto lenout;
}
@ -1753,11 +1756,11 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
if (len < n * sizeof(gid_t)) {
len = n * sizeof(gid_t);
put_cred(cred);
return put_user(len, optlen) ? -EFAULT : -ERANGE;
return copy_to_sockptr(optlen, &len, sizeof(int)) ? -EFAULT : -ERANGE;
}
len = n * sizeof(gid_t);
ret = groups_to_user((gid_t __user *)optval, cred->group_info);
ret = groups_to_user(optval, cred->group_info);
put_cred(cred);
if (ret)
return ret;
@ -1773,7 +1776,7 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
return -ENOTCONN;
if (lv < len)
return -EINVAL;
if (copy_to_user(optval, address, len))
if (copy_to_sockptr(optval, address, len))
return -EFAULT;
goto lenout;
}
@ -1790,7 +1793,7 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
break;
case SO_PEERSEC:
return security_socket_getpeersec_stream(sock, optval, optlen, len);
return security_socket_getpeersec_stream(sock, optval.user, optlen.user, len);
case SO_MARK:
v.val = sk->sk_mark;
@ -1822,7 +1825,7 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
return sock_getbindtodevice(sk, optval, optlen, len);
case SO_GET_FILTER:
len = sk_get_filter(sk, (struct sock_filter __user *)optval, len);
len = sk_get_filter(sk, optval, len);
if (len < 0)
return len;
@ -1870,7 +1873,7 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
sk_get_meminfo(sk, meminfo);
len = min_t(unsigned int, len, sizeof(meminfo));
if (copy_to_user(optval, &meminfo, len))
if (copy_to_sockptr(optval, &meminfo, len))
return -EFAULT;
goto lenout;
@ -1939,10 +1942,10 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
if (len > lv)
len = lv;
if (copy_to_user(optval, &v, len))
if (copy_to_sockptr(optval, &v, len))
return -EFAULT;
lenout:
if (put_user(len, optlen))
if (copy_to_sockptr(optlen, &len, sizeof(int)))
return -EFAULT;
return 0;
}
@ -1950,7 +1953,9 @@ lenout:
int sock_getsockopt(struct socket *sock, int level, int optname,
char __user *optval, int __user *optlen)
{
return sk_getsockopt(sock->sk, level, optname, optval, optlen);
return sk_getsockopt(sock->sk, level, optname,
USER_SOCKPTR(optval),
USER_SOCKPTR(optlen));
}
/*