arm, hw_breakpoints: Fix racy access to ptrace breakpoints

[deliverable/linux.git] / arch / arm / kernel / ptrace.c

diff --git a/arch/arm/kernel/ptrace.c b/arch/arm/kernel/ptrace.c
index 2bf27f364d098c210ed7cca9ece5edca613a9f2b..8182f45ca493724f732f59cfe38e69a7c45afe44 100644 (file)
--- a/arch/arm/kernel/ptrace.c
+++ b/arch/arm/kernel/ptrace.c
@@ -767,12 +767,20 @@ long arch_ptrace(struct task_struct *child, long request,
 
 #ifdef CONFIG_HAVE_HW_BREAKPOINT
                case PTRACE_GETHBPREGS:
+                       if (ptrace_get_breakpoints(child) < 0)
+                               return -ESRCH;
+
                        ret = ptrace_gethbpregs(child, addr,
                                                (unsigned long __user *)data);
+                       ptrace_put_breakpoints(child);
                        break;
                case PTRACE_SETHBPREGS:
+                       if (ptrace_get_breakpoints(child) < 0)
+                               return -ESRCH;
+
                        ret = ptrace_sethbpregs(child, addr,
                                                (unsigned long __user *)data);
+                       ptrace_put_breakpoints(child);
                        break;
 #endif