[PATCH 1/2] powerpc: ptrace CHECK_FULL_REGS

[Roland McGrath]

This restores the CHECK_FULL_REGS sanity check to every place that can
access the nonvolatile GPRs for ptrace.  This is already done for
native-bitwidth PTRACE_PEEKUSR, but was omitted for many other cases
(32-bit ptrace, PTRACE_GETREGS, etc.); I think there may have been more
uniform checks before that were lost in the recent cleanup of GETREGS et al.

Signed-off-by: Roland McGrath <roland at redhat.com>
---
 arch/powerpc/kernel/ptrace.c   |    4 ++++
 arch/powerpc/kernel/ptrace32.c |    8 ++++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/ptrace.c b/arch/powerpc/kernel/ptrace.c
index 8a177bd..40d34b3 100644
--- a/arch/powerpc/kernel/ptrace.c
+++ b/arch/powerpc/kernel/ptrace.c
@@ -331,6 +331,7 @@ static long arch_ptrace_old(struct task_struct *child, long request, long addr,
 		unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
 		unsigned long __user *tmp = (unsigned long __user *)addr;
 
+		CHECK_FULL_REGS(child->thread.regs);
 		for (i = 0; i < 32; i++) {
 			ret = put_user(*reg, tmp);
 			if (ret)
@@ -346,6 +347,7 @@ static long arch_ptrace_old(struct task_struct *child, long request, long addr,
 		unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
 		unsigned long __user *tmp = (unsigned long __user *)addr;
 
+		CHECK_FULL_REGS(child->thread.regs);
 		for (i = 0; i < 32; i++) {
 			ret = get_user(*reg, tmp);
 			if (ret)
@@ -517,6 +519,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 			ret = -EIO;
 			break;
 		}
+		CHECK_FULL_REGS(child->thread.regs);
 		ret = 0;
 		for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
 			ret |= __put_user(ptrace_get_reg(child, ui),
@@ -537,6 +540,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
 			ret = -EIO;
 			break;
 		}
+		CHECK_FULL_REGS(child->thread.regs);
 		ret = 0;
 		for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
 			ret = __get_user(tmp, (unsigned long __user *) data);
diff --git a/arch/powerpc/kernel/ptrace32.c b/arch/powerpc/kernel/ptrace32.c
index 9e6baea..6b86960 100644
--- a/arch/powerpc/kernel/ptrace32.c
+++ b/arch/powerpc/kernel/ptrace32.c
@@ -53,6 +53,7 @@ static long compat_ptrace_old(struct task_struct *child, long request,
 		unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
 		unsigned int __user *tmp = (unsigned int __user *)addr;
 
+		CHECK_FULL_REGS(child->thread.regs);
 		for (i = 0; i < 32; i++) {
 			ret = put_user(*reg, tmp);
 			if (ret)
@@ -68,6 +69,7 @@ static long compat_ptrace_old(struct task_struct *child, long request,
 		unsigned long *reg = &((unsigned long *)child->thread.regs)[0];
 		unsigned int __user *tmp = (unsigned int __user *)addr;
 
+		CHECK_FULL_REGS(child->thread.regs);
 		for (i = 0; i < 32; i++) {
 			ret = get_user(*reg, tmp);
 			if (ret)
@@ -164,6 +166,7 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
 		if ((addr & 3) || (index > PT_FPSCR32))
 			break;
 
+		CHECK_FULL_REGS(child->thread.regs);
 		if (index < PT_FPR0) {
 			tmp = ptrace_get_reg(child, index);
 		} else {
@@ -210,6 +213,7 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
 		if ((addr & 3) || numReg > PT_FPSCR)
 			break;
 
+		CHECK_FULL_REGS(child->thread.regs);
 		if (numReg >= PT_FPR0) {
 			flush_fp_to_thread(child);
 			tmp = ((unsigned long int *)child->thread.fpr)[numReg - PT_FPR0];
@@ -270,6 +274,7 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
 		if ((addr & 3) || (index > PT_FPSCR32))
 			break;
 
+		CHECK_FULL_REGS(child->thread.regs);
 		if (index < PT_FPR0) {
 			ret = ptrace_put_reg(child, index, data);
 		} else {
@@ -307,6 +312,7 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
 		 */
 		if ((addr & 3) || (numReg > PT_FPSCR))
 			break;
+		CHECK_FULL_REGS(child->thread.regs);
 		if (numReg < PT_FPR0) {
 			unsigned long freg = ptrace_get_reg(child, numReg);
 			if (index % 2)
@@ -342,6 +348,7 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
 			ret = -EIO;
 			break;
 		}
+		CHECK_FULL_REGS(child->thread.regs);
 		ret = 0;
 		for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
 			ret |= __put_user(ptrace_get_reg(child, ui),
@@ -359,6 +366,7 @@ long compat_sys_ptrace(int request, int pid, unsigned long addr,
 			ret = -EIO;
 			break;
 		}
+		CHECK_FULL_REGS(child->thread.regs);
 		ret = 0;
 		for (ui = 0; ui < PT_REGS_COUNT; ui ++) {
 			ret = __get_user(tmp, (unsigned int __user *) data);