From 604016f19c7c54949e2f8df05d4de95e2fa2ff60 Mon Sep 17 00:00:00 2001
From: Roland McGrath <roland@redhat.com>
Date: Thu, 20 Dec 2007 03:57:34 -0800
Subject: [PATCH] --- yaml --- r: 83991 b: refs/heads/master c:
 f65255e8d51ecbc6c9eef20d39e0377d19b658ca h: refs/heads/master i:   83989:
 bf0bc89e8cd810ddf06d5409502a7239fc9bf8e3   83987:
 2e4d58f957e32df3b4ea8c3f7c0f0d76bdef5f6d   83983:
 eda8ddf80321cb426a9dac5fe65473477fa95f87 v: v3

---
 [refs]                             |  2 +-
 trunk/arch/powerpc/kernel/ptrace.c | 37 +++++++++++++++++++++++++-----
 2 files changed, 32 insertions(+), 7 deletions(-)

diff --git a/[refs] b/[refs]
index 2c6a61e54e64..e31b477e1009 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 5ab3e84f66321579ca36b63a13bf78decba65121
+refs/heads/master: f65255e8d51ecbc6c9eef20d39e0377d19b658ca
diff --git a/trunk/arch/powerpc/kernel/ptrace.c b/trunk/arch/powerpc/kernel/ptrace.c
index 8b056d2295cc..f1ce64649256 100644
--- a/trunk/arch/powerpc/kernel/ptrace.c
+++ b/trunk/arch/powerpc/kernel/ptrace.c
@@ -21,6 +21,7 @@
 #include <linux/smp.h>
 #include <linux/errno.h>
 #include <linux/ptrace.h>
+#include <linux/regset.h>
 #include <linux/user.h>
 #include <linux/security.h>
 #include <linux/signal.h>
@@ -103,24 +104,48 @@ int ptrace_put_reg(struct task_struct *task, int regno, unsigned long data)
 }
 
 
+static int fpr_get(struct task_struct *target, const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   void *kbuf, void __user *ubuf)
+{
+	flush_fp_to_thread(target);
+
+	BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
+		     offsetof(struct thread_struct, fpr[32]));
+
+	return user_regset_copyout(&pos, &count, &kbuf, &ubuf,
+				   &target->thread.fpr, 0, -1);
+}
+
+static int fpr_set(struct task_struct *target, const struct user_regset *regset,
+		   unsigned int pos, unsigned int count,
+		   const void *kbuf, const void __user *ubuf)
+{
+	flush_fp_to_thread(target);
+
+	BUILD_BUG_ON(offsetof(struct thread_struct, fpscr) !=
+		     offsetof(struct thread_struct, fpr[32]));
+
+	return user_regset_copyin(&pos, &count, &kbuf, &ubuf,
+				  &target->thread.fpr, 0, -1);
+}
+
 static int get_fpregs(void __user *data, struct task_struct *task,
 		      int has_fpscr)
 {
 	unsigned int count = has_fpscr ? 33 : 32;
-
-	if (copy_to_user(data, task->thread.fpr, count * sizeof(double)))
+	if (!access_ok(VERIFY_WRITE, data, count * sizeof(double)))
 		return -EFAULT;
-	return 0;
+	return fpr_get(task, NULL, 0, count * sizeof(double), NULL, data);
 }
 
 static int set_fpregs(void __user *data, struct task_struct *task,
 		      int has_fpscr)
 {
 	unsigned int count = has_fpscr ? 33 : 32;
-
-	if (copy_from_user(task->thread.fpr, data, count * sizeof(double)))
+	if (!access_ok(VERIFY_READ, data, count * sizeof(double)))
 		return -EFAULT;
-	return 0;
+	return fpr_set(task, NULL, 0, count * sizeof(double), NULL, data);
 }