This is a note to let you know that I've just added the patch titled
bpf: net: Change sk_getsockopt() to take the sockptr_t argument
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bpf-net-change-sk_getsockopt-to-take-the-sockptr_t-a.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit cecfb59ff7a95c98b8355c7049ed5c270480496c
Author: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
Date: Thu Sep 1 17:28:02 2022 -0700
bpf: net: Change sk_getsockopt() to take the sockptr_t argument
[ Upstream commit 4ff09db1b79b98b4a2a7511571c640b76cab3beb ]
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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20220902002802.2888419-1-kafai@xxxxxx
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Stable-dep-of: 5c3be3e0eb44 ("ipmr: fix incorrect parameter validation in the ip_mroute_getsockopt() function")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/include/linux/filter.h b/include/linux/filter.h
index 2b6da8e356aab..ddaeb2afc022f 100644
--- a/include/linux/filter.h
+++ b/include/linux/filter.h
@@ -943,8 +943,7 @@ 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);
diff --git a/include/linux/sockptr.h b/include/linux/sockptr.h
index ea193414298b7..38862819e77a1 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);
diff --git a/net/core/filter.c b/net/core/filter.c
index f0a3cdc4d4961..457d1a164ad5d 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -10316,8 +10316,7 @@ 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;
@@ -10348,7 +10347,7 @@ 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
diff --git a/net/core/sock.c b/net/core/sock.c
index f8e3ba34e0a34..6f761f3c272aa 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -671,8 +671,8 @@ static int sock_setbindtodevice(struct sock *sk, sockptr_t optval, int optlen)
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
@@ -695,12 +695,12 @@ 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;
@@ -1404,20 +1404,23 @@ 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;
@@ -1436,7 +1439,7 @@ 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;
@@ -1578,7 +1581,7 @@ 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;
}
@@ -1596,11 +1599,11 @@ 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;
@@ -1616,7 +1619,7 @@ 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;
}
@@ -1633,7 +1636,7 @@ 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;
@@ -1661,7 +1664,7 @@ 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;
@@ -1711,7 +1714,7 @@ 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;
@@ -1772,10 +1775,10 @@ 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;
}
@@ -1783,7 +1786,9 @@ static int sk_getsockopt(struct sock *sk, int level, int optname,
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));
}
/*
