From 065ee7e9f1ef8368f533c160c016b9ed851f7f80 Mon Sep 17 00:00:00 2001
From: "Eric W. Biederman" <ebiederm@xmission.com>
Date: Fri, 3 Apr 2009 00:36:27 -0700
Subject: [PATCH] --- yaml --- r: 169999 b: refs/heads/master c:
 da3f6f9b3e0d1e73975ca81ae124406bf1587d40 h: refs/heads/master i:   169997:
 f805c0522eaf7071285bfbff7ffa4dbd3a8a835b   169995:
 aacf77c3dff244b67b1ca3a91ca756eeaa72137c   169991:
 71a030c44c8e712ba3e443a9911fd6a91e8a3d0c   169983:
 e3df3fc003619bb1dd302bc11a3f6d1e7a989efa v: v3

---
 [refs]                                |  2 +-
 trunk/arch/powerpc/kernel/sys_ppc32.c | 52 ---------------------------
 trunk/kernel/sysctl_binary.c          | 50 ++++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 53 deletions(-)

diff --git a/[refs] b/[refs]
index 1c586ce72b4f..5d56567a83a4 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2830b68361a9f58354ad043c6d85043ea917f907
+refs/heads/master: da3f6f9b3e0d1e73975ca81ae124406bf1587d40
diff --git a/trunk/arch/powerpc/kernel/sys_ppc32.c b/trunk/arch/powerpc/kernel/sys_ppc32.c
index b97c2d67f4ac..c5a4732bcc48 100644
--- a/trunk/arch/powerpc/kernel/sys_ppc32.c
+++ b/trunk/arch/powerpc/kernel/sys_ppc32.c
@@ -520,58 +520,6 @@ asmlinkage long compat_sys_umask(u32 mask)
 	return sys_umask((int)mask);
 }
 
-#ifdef CONFIG_SYSCTL_SYSCALL
-struct __sysctl_args32 {
-	u32 name;
-	int nlen;
-	u32 oldval;
-	u32 oldlenp;
-	u32 newval;
-	u32 newlen;
-	u32 __unused[4];
-};
-
-asmlinkage long compat_sys_sysctl(struct __sysctl_args32 __user *args)
-{
-	struct __sysctl_args32 tmp;
-	int error;
-	size_t oldlen;
-	size_t __user *oldlenp = NULL;
-	unsigned long addr = (((unsigned long)&args->__unused[0]) + 7) & ~7;
-
-	if (copy_from_user(&tmp, args, sizeof(tmp)))
-		return -EFAULT;
-
-	if (tmp.oldval && tmp.oldlenp) {
-		/* Duh, this is ugly and might not work if sysctl_args
-		   is in read-only memory, but do_sysctl does indirectly
-		   a lot of uaccess in both directions and we'd have to
-		   basically copy the whole sysctl.c here, and
-		   glibc's __sysctl uses rw memory for the structure
-		   anyway.  */
-		oldlenp = (size_t __user *)addr;
-		if (get_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)) ||
-		    put_user(oldlen, oldlenp))
-			return -EFAULT;
-	}
-
-	lock_kernel();
-	error = do_sysctl(compat_ptr(tmp.name), tmp.nlen,
-			  compat_ptr(tmp.oldval), oldlenp,
-			  compat_ptr(tmp.newval), tmp.newlen);
-	unlock_kernel();
-	if (oldlenp) {
-		if (!error) {
-			if (get_user(oldlen, oldlenp) ||
-			    put_user(oldlen, (compat_size_t __user *)compat_ptr(tmp.oldlenp)))
-				error = -EFAULT;
-		}
-		copy_to_user(args->__unused, tmp.__unused, sizeof(tmp.__unused));
-	}
-	return error;
-}
-#endif
-
 unsigned long compat_sys_mmap2(unsigned long addr, size_t len,
 			  unsigned long prot, unsigned long flags,
 			  unsigned long fd, unsigned long pgoff)
diff --git a/trunk/kernel/sysctl_binary.c b/trunk/kernel/sysctl_binary.c
index 930a31cd708b..775cc49da622 100644
--- a/trunk/kernel/sysctl_binary.c
+++ b/trunk/kernel/sysctl_binary.c
@@ -176,3 +176,53 @@ SYSCALL_DEFINE1(sysctl, struct __sysctl_args __user *, args)
 
 	return error;
 }
+
+#ifdef CONFIG_COMPAT
+#include <asm/compat.h>
+
+struct compat_sysctl_args {
+	compat_uptr_t	name;
+	int		nlen;
+	compat_uptr_t	oldval;
+	compat_uptr_t	oldlenp;
+	compat_uptr_t	newval;
+	compat_size_t	newlen;
+	compat_ulong_t	__unused[4];
+};
+
+asmlinkage long compat_sys_sysctl(struct compat_sysctl_args __user *args)
+{
+	struct compat_sysctl_args tmp;
+	compat_size_t __user *compat_oldlenp;
+	size_t __user *oldlenp = NULL;
+	size_t oldlen = 0;
+	ssize_t result;
+
+	if (copy_from_user(&tmp, args, sizeof(tmp)))
+		return -EFAULT;
+
+	compat_oldlenp = compat_ptr(tmp.oldlenp);
+	if (compat_oldlenp) {
+		oldlenp = compat_alloc_user_space(sizeof(*compat_oldlenp));
+
+		if (get_user(oldlen, compat_oldlenp) ||
+		    put_user(oldlen, oldlenp))
+			return -EFAULT;
+	}
+
+	lock_kernel();
+	result = do_sysctl(compat_ptr(tmp.name), tmp.nlen,
+			   compat_ptr(tmp.oldval), oldlenp,
+			   compat_ptr(tmp.newval), tmp.newlen);
+	unlock_kernel();
+
+	if (oldlenp && !result) {
+		if (get_user(oldlen, oldlenp) ||
+		    put_user(oldlen, compat_oldlenp))
+			return -EFAULT;
+	}
+
+	return result;
+}
+
+#endif /* CONFIG_COMPAT */