x86/signals: ia32_signal.c: add __user casts to fix sparse warnings

Fix the following sparse warnings by adding appropriate __user
casts and annotations:

  ia32_signal.c:165:38: warning: incorrect type in argument 1 (different address spaces)
   ia32_signal.c:165:38:    expected struct sigaltstack const [noderef] [usertype] <asn:1>*<noident>
  ia32_signal.c:165:38:    got struct sigaltstack *
  [...]

Signed-off-by: Mathias Krause <minipli@googlemail.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Link: http://lkml.kernel.org/r/1346621506-30857-4-git-send-email-minipli@googlemail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 6 insertions, 5 deletions

diff --git a/arch/x86/ia32/ia32_signal.c b/arch/x86/ia32/ia32_signal.c
index 673ac9b63d6b..452d4dd0a95a 100644
--- a/arch/x86/ia32/ia32_signal.c
+++ b/arch/x86/ia32/ia32_signal.c
@@ -162,7 +162,8 @@ asmlinkage long sys32_sigaltstack(const stack_ia32_t __user *uss_ptr,
         }
         seg = get_fs();
         set_fs(KERNEL_DS);
-        ret = do_sigaltstack(uss_ptr ? &uss : NULL, &uoss, regs->sp);
+        ret = do_sigaltstack((stack_t __force __user *) (uss_ptr ? &uss : NULL),
+                             (stack_t __force __user *) &uoss, regs->sp);
         set_fs(seg);
         if (ret >= 0 && uoss_ptr)  {
                 if (!access_ok(VERIFY_WRITE, uoss_ptr, sizeof(stack_ia32_t)))
@@ -361,7 +362,7 @@ static int ia32_setup_sigcontext(struct sigcontext_ia32 __user *sc,
  */
 static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
                                  size_t frame_size,
-                                 void **fpstate)
+                                 void __user **fpstate)
 {
         unsigned long sp;
 
@@ -382,7 +383,7 @@ static void __user *get_sigframe(struct k_sigaction *ka, struct pt_regs *regs,
 
         if (used_math()) {
                 sp = sp - sig_xstate_ia32_size;
-                *fpstate = (struct _fpstate_ia32 *) sp;
+                *fpstate = (struct _fpstate_ia32 __user *) sp;
                 if (save_i387_xstate_ia32(*fpstate) < 0)
                         return (void __user *) -1L;
         }
@@ -448,7 +449,7 @@ int ia32_setup_frame(int sig, struct k_sigaction *ka,
                  * These are actually not used anymore, but left because some
                  * gdb versions depend on them as a marker.
                  */
-                put_user_ex(*((u64 *)&code), (u64 *)frame->retcode);
+                put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
         } put_user_catch(err);
 
         if (err)
@@ -529,7 +530,7 @@ int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                  * Not actually used anymore, but left because some gdb
                  * versions need it.
                  */
-                put_user_ex(*((u64 *)&code), (u64 *)frame->retcode);
+                put_user_ex(*((u64 *)&code), (u64 __user *)frame->retcode);
         } put_user_catch(err);
 
         if (err)