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net: socket: add __compat_sys_...msg() helpers; remove in-kernel calls to compat syscalls

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Using the net-internal helpers __compat_sys_...msg() allows us to avoid
the internal calls to the compat_sys_...msg() syscalls.
compat_sys_recvmmsg() is handled in a different patch.

This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net

Cc: David S. Miller <davem@davemloft.net>
Cc: netdev@vger.kernel.org
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
This commit is contained in:
Dominik Brodowski 2018-03-16 17:07:03 +01:00
parent 157b334aa8
commit 6df354653e
1 changed files with 30 additions and 7 deletions
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37
net/compat.c
View File

@ -747,25 +747,48 @@ static unsigned char nas[21] = {
};
#undef AL
COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
static inline long __compat_sys_sendmsg(int fd,
struct compat_msghdr __user *msg,
unsigned int flags)
{
return __sys_sendmsg(fd, (struct user_msghdr __user *)msg,
flags | MSG_CMSG_COMPAT, false);
}
COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
unsigned int, vlen, unsigned int, flags)
COMPAT_SYSCALL_DEFINE3(sendmsg, int, fd, struct compat_msghdr __user *, msg,
unsigned int, flags)
{
return __compat_sys_sendmsg(fd, msg, flags);
}
static inline long __compat_sys_sendmmsg(int fd,
struct compat_mmsghdr __user *mmsg,
unsigned int vlen, unsigned int flags)
{
return __sys_sendmmsg(fd, (struct mmsghdr __user *)mmsg, vlen,
flags | MSG_CMSG_COMPAT, false);
}
COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg, unsigned int, flags)
COMPAT_SYSCALL_DEFINE4(sendmmsg, int, fd, struct compat_mmsghdr __user *, mmsg,
unsigned int, vlen, unsigned int, flags)
{
return __compat_sys_sendmmsg(fd, mmsg, vlen, flags);
}
static inline long __compat_sys_recvmsg(int fd,
struct compat_msghdr __user *msg,
unsigned int flags)
{
return __sys_recvmsg(fd, (struct user_msghdr __user *)msg,
flags | MSG_CMSG_COMPAT, false);
}
COMPAT_SYSCALL_DEFINE3(recvmsg, int, fd, struct compat_msghdr __user *, msg,
unsigned int, flags)
{
return __compat_sys_recvmsg(fd, msg, flags);
}
static inline long __compat_sys_recvfrom(int fd, void __user *buf,
compat_size_t len, unsigned int flags,
struct sockaddr __user *addr,
@ -893,13 +916,13 @@ COMPAT_SYSCALL_DEFINE2(socketcall, int, call, u32 __user *, args)
compat_ptr(a[4]));
break;
case SYS_SENDMSG:
ret = compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
ret = __compat_sys_sendmsg(a0, compat_ptr(a1), a[2]);
break;
case SYS_SENDMMSG:
ret = compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
ret = __compat_sys_sendmmsg(a0, compat_ptr(a1), a[2], a[3]);
break;
case SYS_RECVMSG:
ret = compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
ret = __compat_sys_recvmsg(a0, compat_ptr(a1), a[2]);
break;
case SYS_RECVMMSG:
ret = __compat_sys_recvmmsg(a0, compat_ptr(a1), a[2], a[3],