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net: socket: add __sys_getpeername() helper; remove in-kernel call to syscall

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Using the net-internal helper __sys_getpeername() allows us to avoid the
internal calls to the sys_getpeername() syscall.

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/[email protected]

Cc: David S. Miller <[email protected]>
Cc: [email protected]
Signed-off-by: Dominik Brodowski <[email protected]>
This commit is contained in:
Dominik Brodowski 2018-03-13 19:47:00 +01:00
commit b21c8f838a
3 changed files with 13 additions and 5 deletions
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14
net/socket.c
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@ -1712,8 +1712,8 @@ SYSCALL_DEFINE3(getsockname, int, fd, struct sockaddr __user *, usockaddr,
* name to user space.
*/
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
int __user *, usockaddr_len)
int __sys_getpeername(int fd, struct sockaddr __user *usockaddr,
int __user *usockaddr_len)
{
struct socket *sock;
struct sockaddr_storage address;
@ -1738,6 +1738,12 @@ SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
return err;
}
SYSCALL_DEFINE3(getpeername, int, fd, struct sockaddr __user *, usockaddr,
int __user *, usockaddr_len)
{
return __sys_getpeername(fd, usockaddr, usockaddr_len);
}
/*
* Send a datagram to a given address. We move the address into kernel
* space and check the user space data area is readable before invoking
@ -2511,8 +2517,8 @@ SYSCALL_DEFINE2(socketcall, int, call, unsigned long __user *, args)
break;
case SYS_GETPEERNAME:
err =
sys_getpeername(a0, (struct sockaddr __user *)a1,
(int __user *)a[2]);
__sys_getpeername(a0, (struct sockaddr __user *)a1,
(int __user *)a[2]);
break;
case SYS_SOCKETPAIR:
err = sys_socketpair(a0, a1, a[2], (int __user *)a[3]);