1 files changed, 93 insertions, 122 deletions

diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index b280908a376e..3160c26db5e7 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -114,7 +114,7 @@ int restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
                 regs->orig_ax = -1;             /* disable syscall checks */
 
                 get_user_ex(buf, &sc->fpstate);
-                err |= restore_i387_xstate(buf);
+                err |= restore_xstate_sig(buf, config_enabled(CONFIG_X86_32));
 
                 get_user_ex(*pax, &sc->ax);
         } get_user_catch(err);
@@ -206,35 +206,32 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
              void __user **fpstate)
 {
         /* Default to using normal stack */
+        unsigned long math_size = 0;
         unsigned long sp = regs->sp;
+        unsigned long buf_fx = 0;
         int onsigstack = on_sig_stack(sp);
 
-#ifdef CONFIG_X86_64
         /* redzone */
-        sp -= 128;
-#endif /* CONFIG_X86_64 */
+        if (config_enabled(CONFIG_X86_64))
+                sp -= 128;
 
         if (!onsigstack) {
                 /* This is the X/Open sanctioned signal stack switching.  */
                 if (ka->sa.sa_flags & SA_ONSTACK) {
                         if (current->sas_ss_size)
                                 sp = current->sas_ss_sp + current->sas_ss_size;
-                } else {
-#ifdef CONFIG_X86_32
-                        /* This is the legacy signal stack switching. */
-                        if ((regs->ss & 0xffff) != __USER_DS &&
-                                !(ka->sa.sa_flags & SA_RESTORER) &&
-                                        ka->sa.sa_restorer)
+                } else if (config_enabled(CONFIG_X86_32) &&
+                           (regs->ss & 0xffff) != __USER_DS &&
+                           !(ka->sa.sa_flags & SA_RESTORER) &&
+                           ka->sa.sa_restorer) {
+                                /* This is the legacy signal stack switching. */
                                 sp = (unsigned long) ka->sa.sa_restorer;
-#endif /* CONFIG_X86_32 */
                 }
         }
 
         if (used_math()) {
-                sp -= sig_xstate_size;
-#ifdef CONFIG_X86_64
-                sp = round_down(sp, 64);
-#endif /* CONFIG_X86_64 */
+                sp = alloc_mathframe(sp, config_enabled(CONFIG_X86_32),
+                                     &buf_fx, &math_size);
                 *fpstate = (void __user *)sp;
         }
 
@@ -247,8 +244,9 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs *regs, size_t frame_size,
         if (onsigstack && !likely(on_sig_stack(sp)))
                 return (void __user *)-1L;
 
-        /* save i387 state */
-        if (used_math() && save_i387_xstate(*fpstate) < 0)
+        /* save i387 and extended state */
+        if (used_math() &&
+            save_xstate_sig(*fpstate, (void __user *)buf_fx, math_size) < 0)
                 return (void __user *)-1L;
 
         return (void __user *)sp;
@@ -474,6 +472,74 @@ static int __setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
 }
 #endif /* CONFIG_X86_32 */
 
+static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
+                              siginfo_t *info, compat_sigset_t *set,
+                              struct pt_regs *regs)
+{
+#ifdef CONFIG_X86_X32_ABI
+        struct rt_sigframe_x32 __user *frame;
+        void __user *restorer;
+        int err = 0;
+        void __user *fpstate = NULL;
+
+        frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
+
+        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
+                return -EFAULT;
+
+        if (ka->sa.sa_flags & SA_SIGINFO) {
+                if (copy_siginfo_to_user32(&frame->info, info))
+                        return -EFAULT;
+        }
+
+        put_user_try {
+                /* Create the ucontext.  */
+                if (cpu_has_xsave)
+                        put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
+                else
+                        put_user_ex(0, &frame->uc.uc_flags);
+                put_user_ex(0, &frame->uc.uc_link);
+                put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
+                put_user_ex(sas_ss_flags(regs->sp),
+                            &frame->uc.uc_stack.ss_flags);
+                put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
+                put_user_ex(0, &frame->uc.uc__pad0);
+                err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
+                                        regs, set->sig[0]);
+                err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+
+                if (ka->sa.sa_flags & SA_RESTORER) {
+                        restorer = ka->sa.sa_restorer;
+                } else {
+                        /* could use a vstub here */
+                        restorer = NULL;
+                        err |= -EFAULT;
+                }
+                put_user_ex(restorer, &frame->pretcode);
+        } put_user_catch(err);
+
+        if (err)
+                return -EFAULT;
+
+        /* Set up registers for signal handler */
+        regs->sp = (unsigned long) frame;
+        regs->ip = (unsigned long) ka->sa.sa_handler;
+
+        /* We use the x32 calling convention here... */
+        regs->di = sig;
+        regs->si = (unsigned long) &frame->info;
+        regs->dx = (unsigned long) &frame->uc;
+
+        loadsegment(ds, __USER_DS);
+        loadsegment(es, __USER_DS);
+
+        regs->cs = __USER_CS;
+        regs->ss = __USER_DS;
+#endif  /* CONFIG_X86_X32_ABI */
+
+        return 0;
+}
+
 #ifdef CONFIG_X86_32
 /*
  * Atomically swap in the new signal mask, and wait for a signal.
@@ -612,55 +678,22 @@ static int signr_convert(int sig)
         return sig;
 }
 
-#ifdef CONFIG_X86_32
-
-#define is_ia32 1
-#define ia32_setup_frame        __setup_frame
-#define ia32_setup_rt_frame     __setup_rt_frame
-
-#else /* !CONFIG_X86_32 */
-
-#ifdef CONFIG_IA32_EMULATION
-#define is_ia32 test_thread_flag(TIF_IA32)
-#else /* !CONFIG_IA32_EMULATION */
-#define is_ia32 0
-#endif /* CONFIG_IA32_EMULATION */
-
-#ifdef CONFIG_X86_X32_ABI
-#define is_x32  test_thread_flag(TIF_X32)
-
-static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
-                              siginfo_t *info, compat_sigset_t *set,
-                              struct pt_regs *regs);
-#else /* !CONFIG_X86_X32_ABI */
-#define is_x32  0
-#endif /* CONFIG_X86_X32_ABI */
-
-int ia32_setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
-                sigset_t *set, struct pt_regs *regs);
-int ia32_setup_frame(int sig, struct k_sigaction *ka,
-                sigset_t *set, struct pt_regs *regs);
-
-#endif /* CONFIG_X86_32 */
-
 static int
 setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
                 struct pt_regs *regs)
 {
         int usig = signr_convert(sig);
         sigset_t *set = sigmask_to_save();
+        compat_sigset_t *cset = (compat_sigset_t *) set;
 
         /* Set up the stack frame */
-        if (is_ia32) {
+        if (is_ia32_frame()) {
                 if (ka->sa.sa_flags & SA_SIGINFO)
-                        return ia32_setup_rt_frame(usig, ka, info, set, regs);
+                        return ia32_setup_rt_frame(usig, ka, info, cset, regs);
                 else
-                        return ia32_setup_frame(usig, ka, set, regs);
-#ifdef CONFIG_X86_X32_ABI
-        } else if (is_x32) {
-                return x32_setup_rt_frame(usig, ka, info,
-                                         (compat_sigset_t *)set, regs);
-#endif
+                        return ia32_setup_frame(usig, ka, cset, regs);
+        } else if (is_x32_frame()) {
+                return x32_setup_rt_frame(usig, ka, info, cset, regs);
         } else {
                 return __setup_rt_frame(sig, ka, info, set, regs);
         }
@@ -779,6 +812,8 @@ static void do_signal(struct pt_regs *regs)
 void
 do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
 {
+        rcu_user_exit();
+
 #ifdef CONFIG_X86_MCE
         /* notify userspace of pending MCEs */
         if (thread_info_flags & _TIF_MCE_NOTIFY)
@@ -804,6 +839,8 @@ do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
 #ifdef CONFIG_X86_32
         clear_thread_flag(TIF_IRET);
 #endif /* CONFIG_X86_32 */
+
+        rcu_user_enter();
 }
 
 void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
@@ -824,72 +861,6 @@ void signal_fault(struct pt_regs *regs, void __user *frame, char *where)
 }
 
 #ifdef CONFIG_X86_X32_ABI
-static int x32_setup_rt_frame(int sig, struct k_sigaction *ka,
-                              siginfo_t *info, compat_sigset_t *set,
-                              struct pt_regs *regs)
-{
-        struct rt_sigframe_x32 __user *frame;
-        void __user *restorer;
-        int err = 0;
-        void __user *fpstate = NULL;
-
-        frame = get_sigframe(ka, regs, sizeof(*frame), &fpstate);
-
-        if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-                return -EFAULT;
-
-        if (ka->sa.sa_flags & SA_SIGINFO) {
-                if (copy_siginfo_to_user32(&frame->info, info))
-                        return -EFAULT;
-        }
-
-        put_user_try {
-                /* Create the ucontext.  */
-                if (cpu_has_xsave)
-                        put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
-                else
-                        put_user_ex(0, &frame->uc.uc_flags);
-                put_user_ex(0, &frame->uc.uc_link);
-                put_user_ex(current->sas_ss_sp, &frame->uc.uc_stack.ss_sp);
-                put_user_ex(sas_ss_flags(regs->sp),
-                            &frame->uc.uc_stack.ss_flags);
-                put_user_ex(current->sas_ss_size, &frame->uc.uc_stack.ss_size);
-                put_user_ex(0, &frame->uc.uc__pad0);
-                err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-                                        regs, set->sig[0]);
-                err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
-                if (ka->sa.sa_flags & SA_RESTORER) {
-                        restorer = ka->sa.sa_restorer;
-                } else {
-                        /* could use a vstub here */
-                        restorer = NULL;
-                        err |= -EFAULT;
-                }
-                put_user_ex(restorer, &frame->pretcode);
-        } put_user_catch(err);
-
-        if (err)
-                return -EFAULT;
-
-        /* Set up registers for signal handler */
-        regs->sp = (unsigned long) frame;
-        regs->ip = (unsigned long) ka->sa.sa_handler;
-
-        /* We use the x32 calling convention here... */
-        regs->di = sig;
-        regs->si = (unsigned long) &frame->info;
-        regs->dx = (unsigned long) &frame->uc;
-
-        loadsegment(ds, __USER_DS);
-        loadsegment(es, __USER_DS);
-
-        regs->cs = __USER_CS;
-        regs->ss = __USER_DS;
-
-        return 0;
-}
-
 asmlinkage long sys32_x32_rt_sigreturn(struct pt_regs *regs)
 {
         struct rt_sigframe_x32 __user *frame;