1 files changed, 30 insertions, 1 deletions

diff --git a/arch/x86/kernel/ptrace.c b/arch/x86/kernel/ptrace.c
index d862e396b099..d5904eef1d31 100644
--- a/arch/x86/kernel/ptrace.c
+++ b/arch/x86/kernel/ptrace.c
@@ -323,6 +323,16 @@ static int putreg(struct task_struct *child,
                 return set_flags(child, value);
 
 #ifdef CONFIG_X86_64
+        /*
+         * Orig_ax is really just a flag with small positive and
+         * negative values, so make sure to always sign-extend it
+         * from 32 bits so that it works correctly regardless of
+         * whether we come from a 32-bit environment or not.
+         */
+        case offsetof(struct user_regs_struct, orig_ax):
+                value = (long) (s32) value;
+                break;
+
         case offsetof(struct user_regs_struct,fs_base):
                 if (value >= TASK_SIZE_OF(child))
                         return -EIO;
@@ -544,6 +554,8 @@ static int ptrace_set_debugreg(struct task_struct *child,
         return 0;
 }
 
+#ifdef X86_BTS
+
 static int ptrace_bts_get_size(struct task_struct *child)
 {
         if (!child->thread.ds_area_msr)
@@ -826,6 +838,7 @@ void ptrace_bts_take_timestamp(struct task_struct *tsk,
 
         ptrace_bts_write_record(tsk, &rec);
 }
+#endif /* X86_BTS */
 
 /*
  * Called by kernel/ptrace.c when detaching..
@@ -839,7 +852,9 @@ void ptrace_disable(struct task_struct *child)
         clear_tsk_thread_flag(child, TIF_SYSCALL_EMU);
 #endif
         if (child->thread.ds_area_msr) {
+#ifdef X86_BTS
                 ptrace_bts_realloc(child, 0, 0);
+#endif
                 child->thread.debugctlmsr &= ~ds_debugctl_mask();
                 if (!child->thread.debugctlmsr)
                         clear_tsk_thread_flag(child, TIF_DEBUGCTLMSR);
@@ -961,6 +976,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                 break;
 #endif
 
+        /*
+         * These bits need more cooking - not enabled yet:
+         */
+#ifdef X86_BTS
         case PTRACE_BTS_CONFIG:
                 ret = ptrace_bts_config
                         (child, data, (struct ptrace_bts_config __user *)addr);
@@ -988,6 +1007,7 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data)
                 ret = ptrace_bts_drain
                         (child, data, (struct bts_struct __user *) addr);
                 break;
+#endif
 
         default:
                 ret = ptrace_request(child, request, addr, data);
@@ -1035,10 +1055,17 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 value)
         R32(esi, si);
         R32(ebp, bp);
         R32(eax, ax);
-        R32(orig_eax, orig_ax);
         R32(eip, ip);
         R32(esp, sp);
 
+        case offsetof(struct user32, regs.orig_eax):
+                /*
+                 * Sign-extend the value so that orig_eax = -1
+                 * causes (long)orig_ax < 0 tests to fire correctly.
+                 */
+                regs->orig_ax = (long) (s32) value;
+                break;
+
         case offsetof(struct user32, regs.eflags):
                 return set_flags(child, value);
 
@@ -1226,12 +1253,14 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data)
         case PTRACE_SETOPTIONS:
         case PTRACE_SET_THREAD_AREA:
         case PTRACE_GET_THREAD_AREA:
+#ifdef X86_BTS
         case PTRACE_BTS_CONFIG:
         case PTRACE_BTS_STATUS:
         case PTRACE_BTS_SIZE:
         case PTRACE_BTS_GET:
         case PTRACE_BTS_CLEAR:
         case PTRACE_BTS_DRAIN:
+#endif
                 return sys_ptrace(request, pid, addr, data);
 
         default: