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[ARM] 3308/1: old ABI compat: struct sockaddr_un

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Patch from Nicolas Pitre

struct sockaddr_un loses its padding with EABI.  Since the size of the
structure is used as a validation test in unix_mkname(), we need to
change the length argument to 110 whenever it is 112.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Nicolas Pitre 2006-02-08 21:19:36 +00:00 committed by Russell King
parent a73a3ff127
commit 99595d0237
2 changed files with 75 additions and 4 deletions
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8
arch/arm/kernel/calls.S
View File

@ -291,21 +291,21 @@
CALL(sys_mq_getsetattr)
/* 280 */ CALL(sys_waitid)
CALL(sys_socket)
CALL(sys_bind)
CALL(sys_connect)
CALL(ABI(sys_bind, sys_oabi_bind))
CALL(ABI(sys_connect, sys_oabi_connect))
CALL(sys_listen)
/* 285 */ CALL(sys_accept)
CALL(sys_getsockname)
CALL(sys_getpeername)
CALL(sys_socketpair)
CALL(sys_send)
/* 290 */ CALL(sys_sendto)
/* 290 */ CALL(ABI(sys_sendto, sys_oabi_sendto))
CALL(sys_recv)
CALL(sys_recvfrom)
CALL(sys_shutdown)
CALL(sys_setsockopt)
/* 295 */ CALL(sys_getsockopt)
CALL(sys_sendmsg)
CALL(ABI(sys_sendmsg, sys_oabi_sendmsg))
CALL(sys_recvmsg)
CALL(ABI(sys_semop, sys_oabi_semop))
CALL(sys_semget)

71
arch/arm/kernel/sys_oabi-compat.c
View File

@ -59,6 +59,16 @@
* struct sembuf loses its padding with EABI. Since arrays of them are
* used they have to be copyed to remove the padding. Compatibility wrappers
* provided below.
*
* sys_bind:
* sys_connect:
* sys_sendmsg:
* sys_sendto:
*
* struct sockaddr_un loses its padding with EABI. Since the size of the
* structure is used as a validation test in unix_mkname(), we need to
* change the length argument to 110 whenever it is 112. Compatibility
* wrappers provided below.
*/
#include <linux/syscalls.h>
@ -67,6 +77,7 @@
#include <linux/fcntl.h>
#include <linux/eventpoll.h>
#include <linux/sem.h>
#include <linux/socket.h>
#include <asm/ipc.h>
#include <asm/uaccess.h>
@ -337,3 +348,63 @@ asmlinkage int sys_oabi_ipc(uint call, int first, int second, int third,
return sys_ipc(call, first, second, third, ptr, fifth);
}
}
asmlinkage long sys_oabi_bind(int fd, struct sockaddr __user *addr, int addrlen)
{
sa_family_t sa_family;
if (addrlen == 112 &&
get_user(sa_family, &addr->sa_family) == 0 &&
sa_family == AF_UNIX)
addrlen = 110;
return sys_bind(fd, addr, addrlen);
}
asmlinkage long sys_oabi_connect(int fd, struct sockaddr __user *addr, int addrlen)
{
sa_family_t sa_family;
if (addrlen == 112 &&
get_user(sa_family, &addr->sa_family) == 0 &&
sa_family == AF_UNIX)
addrlen = 110;
return sys_connect(fd, addr, addrlen);
}
asmlinkage long sys_oabi_sendto(int fd, void __user *buff,
size_t len, unsigned flags,
struct sockaddr __user *addr,
int addrlen)
{
sa_family_t sa_family;
if (addrlen == 112 &&
get_user(sa_family, &addr->sa_family) == 0 &&
sa_family == AF_UNIX)
addrlen = 110;
return sys_sendto(fd, buff, len, flags, addr, addrlen);
}
asmlinkage long sys_oabi_sendmsg(int fd, struct msghdr __user *msg, unsigned flags)
{
struct sockaddr __user *addr;
int msg_namelen;
sa_family_t sa_family;
if (msg &&
get_user(msg_namelen, &msg->msg_namelen) == 0 &&
msg_namelen == 112 &&
get_user(addr, &msg->msg_name) == 0 &&
get_user(sa_family, &addr->sa_family) == 0 &&
sa_family == AF_UNIX)
{
/*
* HACK ALERT: there is a limit to how much backward bending
* we should do for what is actually a transitional
* compatibility layer. This already has known flaws with
* a few ioctls that we don't intend to fix. Therefore
* consider this blatent hack as another one... and take care
* to run for cover. In most cases it will "just work fine".
* If it doesn't, well, tough.
*/
put_user(110, &msg->msg_namelen);
}
return sys_sendmsg(fd, msg, flags);
}