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Date:      Thu, 28 May 2009 04:08:07 +0000 (UTC)
From:      Dmitry Chagin <dchagin@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-7@freebsd.org
Subject:   svn commit: r192952 - in stable/7/sys: . compat/linux contrib/pf dev/ath/ath_hal dev/cxgb
Message-ID:  <200905280408.n4S487g6022044@svn.freebsd.org>
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Author: dchagin
Date: Thu May 28 04:08:07 2009
New Revision: 192952
URL: http://svn.freebsd.org/changeset/base/192952

Log:
  Merge r192373 from HEAD to stable/7:
  
  Validate user-supplied arguments values.
  Args argument is a pointer to the structure located in user space in
  which the socketcall arguments are packed. The structure must be
  copied to the kernel instead of direct dereferencing.
  
  Approved by:	kib (mentor)

Modified:
  stable/7/sys/   (props changed)
  stable/7/sys/compat/linux/linux_socket.c
  stable/7/sys/contrib/pf/   (props changed)
  stable/7/sys/dev/ath/ath_hal/   (props changed)
  stable/7/sys/dev/cxgb/   (props changed)

Modified: stable/7/sys/compat/linux/linux_socket.c
==============================================================================
--- stable/7/sys/compat/linux/linux_socket.c	Thu May 28 04:03:16 2009	(r192951)
+++ stable/7/sys/compat/linux/linux_socket.c	Thu May 28 04:08:07 2009	(r192952)
@@ -1203,11 +1203,38 @@ linux_getsockopt(struct thread *td, stru
 	return (error);
 }
 
+/* Argument list sizes for linux_socketcall */
+
+#define LINUX_AL(x) ((x) * sizeof(l_ulong))
+
+static const unsigned char lxs_args[] = {
+	LINUX_AL(0) /* unused*/,	LINUX_AL(3) /* socket */,
+	LINUX_AL(3) /* bind */,		LINUX_AL(3) /* connect */,
+	LINUX_AL(2) /* listen */,	LINUX_AL(3) /* accept */,
+	LINUX_AL(3) /* getsockname */,	LINUX_AL(3) /* getpeername */,
+	LINUX_AL(4) /* socketpair */,	LINUX_AL(4) /* send */,
+	LINUX_AL(4) /* recv */,		LINUX_AL(6) /* sendto */,
+	LINUX_AL(6) /* recvfrom */,	LINUX_AL(2) /* shutdown */,
+	LINUX_AL(5) /* setsockopt */,	LINUX_AL(5) /* getsockopt */,
+	LINUX_AL(3) /* sendmsg */,	LINUX_AL(3) /* recvmsg */
+};
+
+#define	LINUX_AL_SIZE	sizeof(lxs_args) / sizeof(lxs_args[0]) - 1
+
 int
 linux_socketcall(struct thread *td, struct linux_socketcall_args *args)
 {
-	void *arg = (void *)(intptr_t)args->args;
+	l_ulong a[6];
+	void *arg;
+	int error;
+
+	if (args->what < LINUX_SOCKET || args->what > LINUX_AL_SIZE)
+		return (EINVAL);
+	error = copyin(PTRIN(args->args), a, lxs_args[args->what]);
+	if (error)
+		return (error);
 
+	arg = a;
 	switch (args->what) {
 	case LINUX_SOCKET:
 		return (linux_socket(td, arg));

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