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

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>

2 files changed, 75 insertions, 4 deletions

diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index d058e7c12568..8c3035d5ffc9 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -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)
diff --git a/arch/arm/kernel/sys_oabi-compat.c b/arch/arm/kernel/sys_oabi-compat.c
index eafa8e5284af..9d4b76409c64 100644
--- a/arch/arm/kernel/sys_oabi-compat.c
+++ b/arch/arm/kernel/sys_oabi-compat.c
@@ -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);
+}
+