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net: Unbreak compat_sys_{send,recv}msg 

I broke them in this commit:

    commit 1be374a051
    Author: Andy Lutomirski <luto@amacapital.net>
    Date:   Wed May 22 14:07:44 2013 -0700

        net: Block MSG_CMSG_COMPAT in send(m)msg and recv(m)msg

This patch adds __sys_sendmsg and __sys_sendmsg as common helpers that accept
MSG_CMSG_COMPAT and blocks MSG_CMSG_COMPAT at the syscall entrypoints.  It
also reverts some unnecessary checks in sys_socketcall.

Apparently I was suffering from underscore blindness the first time around.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Tested-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Andy Lutomirski 2013-06-05 19:38:26 +00:00 committed by David S. Miller
parent 4d3797d7e1
commit a7526eb5d0
3 changed files with 47 additions and 41 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/socket.h
View File

@ -320,6 +320,9 @@ extern int put_cmsg(struct msghdr*, int level, int type, int len, void *data);
struct timespec; struct timespec;
/* The __sys_...msg variants allow MSG_CMSG_COMPAT */
extern long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags);
extern long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags);
extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, extern int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
unsigned int flags, struct timespec *timeout); unsigned int flags, struct timespec *timeout);
extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, extern int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg,

13
net/compat.c
View File

@ -734,19 +734,25 @@ static unsigned char nas[21] = {
asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) asmlinkage long compat_sys_sendmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
{ {
return sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
return __sys_sendmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
} }
asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg, asmlinkage long compat_sys_sendmmsg(int fd, struct compat_mmsghdr __user *mmsg,
unsigned int vlen, unsigned int flags) unsigned int vlen, unsigned int flags)
{ {
if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
flags | MSG_CMSG_COMPAT); flags | MSG_CMSG_COMPAT);
} }
asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags) asmlinkage long compat_sys_recvmsg(int fd, struct compat_msghdr __user *msg, unsigned int flags)
{ {
return sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT); if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
return __sys_recvmsg(fd, (struct msghdr __user *)msg, flags | MSG_CMSG_COMPAT);
} }
asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags) asmlinkage long compat_sys_recv(int fd, void __user *buf, size_t len, unsigned int flags)
@ -768,6 +774,9 @@ asmlinkage long compat_sys_recvmmsg(int fd, struct compat_mmsghdr __user *mmsg,
int datagrams; int datagrams;
struct timespec ktspec; struct timespec ktspec;
if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
if (COMPAT_USE_64BIT_TIME) if (COMPAT_USE_64BIT_TIME)
return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen, return __sys_recvmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
flags | MSG_CMSG_COMPAT, flags | MSG_CMSG_COMPAT,

72
net/socket.c
View File

@ -1956,7 +1956,7 @@ struct used_address {
unsigned int name_len; unsigned int name_len;
}; };
static int __sys_sendmsg(struct socket *sock, struct msghdr __user *msg, static int ___sys_sendmsg(struct socket *sock, struct msghdr __user *msg,
struct msghdr *msg_sys, unsigned int flags, struct msghdr *msg_sys, unsigned int flags,
struct used_address *used_address) struct used_address *used_address)
{ {
@ -2071,26 +2071,30 @@ out:
* BSD sendmsg interface * BSD sendmsg interface
*/ */
SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags) long __sys_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
{ {
int fput_needed, err; int fput_needed, err;
struct msghdr msg_sys; struct msghdr msg_sys;
struct socket *sock; struct socket *sock;
if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
sock = sockfd_lookup_light(fd, &err, &fput_needed); sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock) if (!sock)
goto out; goto out;
err = __sys_sendmsg(sock, msg, &msg_sys, flags, NULL); err = ___sys_sendmsg(sock, msg, &msg_sys, flags, NULL);
fput_light(sock->file, fput_needed); fput_light(sock->file, fput_needed);
out: out:
return err; return err;
} }
SYSCALL_DEFINE3(sendmsg, int, fd, struct msghdr __user *, msg, unsigned int, flags)
{
if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
return __sys_sendmsg(fd, msg, flags);
}
/* /*
* Linux sendmmsg interface * Linux sendmmsg interface
*/ */
@ -2121,15 +2125,16 @@ int __sys_sendmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
while (datagrams < vlen) { while (datagrams < vlen) {
if (MSG_CMSG_COMPAT & flags) { if (MSG_CMSG_COMPAT & flags) {
err = __sys_sendmsg(sock, (struct msghdr __user *)compat_entry, err = ___sys_sendmsg(sock, (struct msghdr __user *)compat_entry,
&msg_sys, flags, &used_address); &msg_sys, flags, &used_address);
if (err < 0) if (err < 0)
break; break;
err = __put_user(err, &compat_entry->msg_len); err = __put_user(err, &compat_entry->msg_len);
++compat_entry; ++compat_entry;
} else { } else {
err = __sys_sendmsg(sock, (struct msghdr __user *)entry, err = ___sys_sendmsg(sock,
&msg_sys, flags, &used_address); (struct msghdr __user *)entry,
&msg_sys, flags, &used_address);
if (err < 0) if (err < 0)
break; break;
err = put_user(err, &entry->msg_len); err = put_user(err, &entry->msg_len);
@ -2158,7 +2163,7 @@ SYSCALL_DEFINE4(sendmmsg, int, fd, struct mmsghdr __user *, mmsg,
return __sys_sendmmsg(fd, mmsg, vlen, flags); return __sys_sendmmsg(fd, mmsg, vlen, flags);
} }
static int __sys_recvmsg(struct socket *sock, struct msghdr __user *msg, static int ___sys_recvmsg(struct socket *sock, struct msghdr __user *msg,
struct msghdr *msg_sys, unsigned int flags, int nosec) struct msghdr *msg_sys, unsigned int flags, int nosec)
{ {
struct compat_msghdr __user *msg_compat = struct compat_msghdr __user *msg_compat =
@ -2250,27 +2255,31 @@ out:
* BSD recvmsg interface * BSD recvmsg interface
*/ */
SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg, long __sys_recvmsg(int fd, struct msghdr __user *msg, unsigned flags)
unsigned int, flags)
{ {
int fput_needed, err; int fput_needed, err;
struct msghdr msg_sys; struct msghdr msg_sys;
struct socket *sock; struct socket *sock;
if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
sock = sockfd_lookup_light(fd, &err, &fput_needed); sock = sockfd_lookup_light(fd, &err, &fput_needed);
if (!sock) if (!sock)
goto out; goto out;
err = __sys_recvmsg(sock, msg, &msg_sys, flags, 0); err = ___sys_recvmsg(sock, msg, &msg_sys, flags, 0);
fput_light(sock->file, fput_needed); fput_light(sock->file, fput_needed);
out: out:
return err; return err;
} }
SYSCALL_DEFINE3(recvmsg, int, fd, struct msghdr __user *, msg,
unsigned int, flags)
{
if (flags & MSG_CMSG_COMPAT)
return -EINVAL;
return __sys_recvmsg(fd, msg, flags);
}
/* /*
* Linux recvmmsg interface * Linux recvmmsg interface
*/ */
@ -2308,17 +2317,18 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
* No need to ask LSM for more than the first datagram. * No need to ask LSM for more than the first datagram.
*/ */
if (MSG_CMSG_COMPAT & flags) { if (MSG_CMSG_COMPAT & flags) {
err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry, err = ___sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
&msg_sys, flags & ~MSG_WAITFORONE, &msg_sys, flags & ~MSG_WAITFORONE,
datagrams); datagrams);
if (err < 0) if (err < 0)
break; break;
err = __put_user(err, &compat_entry->msg_len); err = __put_user(err, &compat_entry->msg_len);
++compat_entry; ++compat_entry;
} else { } else {
err = __sys_recvmsg(sock, (struct msghdr __user *)entry, err = ___sys_recvmsg(sock,
&msg_sys, flags & ~MSG_WAITFORONE, (struct msghdr __user *)entry,
datagrams); &msg_sys, flags & ~MSG_WAITFORONE,
datagrams);
if (err < 0) if (err < 0)
break; break;
err = put_user(err, &entry->msg_len); err = put_user(err, &entry->msg_len);
@ -2505,31 +2515,15 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
(int __user *)a[4]); (int __user *)a[4]);
break; break;
case SYS_SENDMSG: case SYS_SENDMSG:
if (a[2] & MSG_CMSG_COMPAT) {
err = -EINVAL;
break;
}
err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]); err = sys_sendmsg(a0, (struct msghdr __user *)a1, a[2]);
break; break;
case SYS_SENDMMSG: case SYS_SENDMMSG:
if (a[3] & MSG_CMSG_COMPAT) {
err = -EINVAL;
break;
}
err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]); err = sys_sendmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3]);
break; break;
case SYS_RECVMSG: case SYS_RECVMSG:
if (a[2] & MSG_CMSG_COMPAT) {
err = -EINVAL;
break;
}
err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]); err = sys_recvmsg(a0, (struct msghdr __user *)a1, a[2]);
break; break;
case SYS_RECVMMSG: case SYS_RECVMMSG:
if (a[3] & MSG_CMSG_COMPAT) {
err = -EINVAL;
break;
}
err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3], err = sys_recvmmsg(a0, (struct mmsghdr __user *)a1, a[2], a[3],
(struct timespec __user *)a[4]); (struct timespec __user *)a[4]);
break; break;