1 files changed, 11 insertions, 6 deletions

diff --git a/arch/x86_64/kernel/ptrace.c b/arch/x86_64/kernel/ptrace.c
index e26e86bb56fe..525f6a128a27 100644
--- a/arch/x86_64/kernel/ptrace.c
+++ b/arch/x86_64/kernel/ptrace.c
@@ -257,13 +257,13 @@ static int putreg(struct task_struct *child,
                         value &= 0xffff;
                         return 0;
                 case offsetof(struct user_regs_struct,fs_base):
-                        if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
-                                return -EIO; 
+                        if (value >= TASK_SIZE)
+                                return -EIO;
                         child->thread.fs = value;
                         return 0;
                 case offsetof(struct user_regs_struct,gs_base):
-                        if (!((value >> 48) == 0 || (value >> 48) == 0xffff))
-                                return -EIO; 
+                        if (value >= TASK_SIZE)
+                                return -EIO;
                         child->thread.gs = value;
                         return 0;
                 case offsetof(struct user_regs_struct, eflags):
@@ -277,6 +277,11 @@ static int putreg(struct task_struct *child,
                                 return -EIO;
                         value &= 0xffff;
                         break;
+                case offsetof(struct user_regs_struct, rip):
+                        /* Check if the new RIP address is canonical */
+                        if (value >= TASK_SIZE)
+                                return -EIO;
+                        break;
         }
         put_stack_long(child, regno - sizeof(struct pt_regs), value);
         return 0;
@@ -375,7 +380,7 @@ asmlinkage long sys_ptrace(long request, long pid, unsigned long addr, long data
                         break;
 
                 switch (addr) { 
-                case 0 ... sizeof(struct user_regs_struct):
+                case 0 ... sizeof(struct user_regs_struct) - sizeof(long):
                         tmp = getreg(child, addr);
                         break;
                 case offsetof(struct user, u_debugreg[0]):
@@ -420,7 +425,7 @@ asmlinkage long sys_ptrace(long request, long pid, unsigned long addr, long data
                         break;
 
                 switch (addr) { 
-                case 0 ... sizeof(struct user_regs_struct): 
+                case 0 ... sizeof(struct user_regs_struct) - sizeof(long):
                         ret = putreg(child, addr, data);
                         break;
                 /* Disallows to set a breakpoint into the vsyscall */