Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal

Pull signal handling cleanups from Al Viro:
 "This is the first pile; another one will come a bit later and will
  contain SYSCALL_DEFINE-related patches.

   - a bunch of signal-related syscalls (both native and compat)
     unified.

   - a bunch of compat syscalls switched to COMPAT_SYSCALL_DEFINE
     (fixing several potential problems with missing argument
     validation, while we are at it)

   - a lot of now-pointless wrappers killed

   - a couple of architectures (cris and hexagon) forgot to save
     altstack settings into sigframe, even though they used the
     (uninitialized) values in sigreturn; fixed.

   - microblaze fixes for delivery of multiple signals arriving at once

   - saner set of helpers for signal delivery introduced, several
     architectures switched to using those."

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/signal: (143 commits)
  x86: convert to ksignal
  sparc: convert to ksignal
  arm: switch to struct ksignal * passing
  alpha: pass k_sigaction and siginfo_t using ksignal pointer
  burying unused conditionals
  make do_sigaltstack() static
  arm64: switch to generic old sigaction() (compat-only)
  arm64: switch to generic compat rt_sigaction()
  arm64: switch compat to generic old sigsuspend
  arm64: switch to generic compat rt_sigqueueinfo()
  arm64: switch to generic compat rt_sigpending()
  arm64: switch to generic compat rt_sigprocmask()
  arm64: switch to generic sigaltstack
  sparc: switch to generic old sigsuspend
  sparc: COMPAT_SYSCALL_DEFINE does all sign-extension as well as SYSCALL_DEFINE
  sparc: kill sign-extending wrappers for native syscalls
  kill sparc32_open()
  sparc: switch to use of generic old sigaction
  sparc: switch sys_compat_rt_sigaction() to COMPAT_SYSCALL_DEFINE
  mips: switch to generic sys_fork() and sys_clone()
  ...

4 files changed, 6 insertions, 77 deletions

diff --git a/arch/mn10300/Kconfig b/arch/mn10300/Kconfig
index e70001cfa05b..ad0caea0bfea 100644
--- a/arch/mn10300/Kconfig
+++ b/arch/mn10300/Kconfig
@@ -10,6 +10,8 @@ config MN10300
         select HAVE_NMI_WATCHDOG if MN10300_WD_TIMER
         select GENERIC_CLOCKEVENTS
         select MODULES_USE_ELF_RELA
+        select OLD_SIGSUSPEND3
+        select OLD_SIGACTION
 
 config AM33_2
         def_bool n
diff --git a/arch/mn10300/include/asm/signal.h b/arch/mn10300/include/asm/signal.h
index d280e9780793..214ff5e9fe60 100644
--- a/arch/mn10300/include/asm/signal.h
+++ b/arch/mn10300/include/asm/signal.h
@@ -26,23 +26,8 @@ typedef struct {
         unsigned long   sig[_NSIG_WORDS];
 } sigset_t;
 
-struct old_sigaction {
-        __sighandler_t sa_handler;
-        old_sigset_t sa_mask;
-        unsigned long sa_flags;
-        __sigrestore_t sa_restorer;
-};
-
-struct sigaction {
-        __sighandler_t sa_handler;
-        unsigned long sa_flags;
-        __sigrestore_t sa_restorer;
-        sigset_t sa_mask;               /* mask last for extensibility */
-};
-
-struct k_sigaction {
-        struct sigaction sa;
-};
+#define __ARCH_HAS_SA_RESTORER
+
 #include <asm/sigcontext.h>
 
 #endif /* _ASM_SIGNAL_H */
diff --git a/arch/mn10300/include/asm/unistd.h b/arch/mn10300/include/asm/unistd.h
index e6d2ed4ba68f..7f9d9adfa51e 100644
--- a/arch/mn10300/include/asm/unistd.h
+++ b/arch/mn10300/include/asm/unistd.h
@@ -41,8 +41,6 @@
 #define __ARCH_WANT_SYS_OLDUMOUNT
 #define __ARCH_WANT_SYS_SIGPENDING
 #define __ARCH_WANT_SYS_SIGPROCMASK
-#define __ARCH_WANT_SYS_RT_SIGACTION
-#define __ARCH_WANT_SYS_RT_SIGSUSPEND
 #define __ARCH_WANT_SYS_FORK
 #define __ARCH_WANT_SYS_VFORK
 #define __ARCH_WANT_SYS_CLONE
diff --git a/arch/mn10300/kernel/signal.c b/arch/mn10300/kernel/signal.c
index f570b3085ef9..9dfac5cd16e6 100644
--- a/arch/mn10300/kernel/signal.c
+++ b/arch/mn10300/kernel/signal.c
@@ -32,59 +32,6 @@
 #define DEBUG_SIG 0
 
 /*
- * atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage long sys_sigsuspend(int history0, int history1, old_sigset_t mask)
-{
-        sigset_t blocked;
-        siginitset(&blocked, mask);
-        return sigsuspend(&blocked);
-}
-
-/*
- * set signal action syscall
- */
-asmlinkage long sys_sigaction(int sig,
-                              const struct old_sigaction __user *act,
-                              struct old_sigaction __user *oact)
-{
-        struct k_sigaction new_ka, old_ka;
-        int ret;
-
-        if (act) {
-                old_sigset_t mask;
-                if (verify_area(VERIFY_READ, act, sizeof(*act)) ||
-                    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-                    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
-                    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
-                    __get_user(mask, &act->sa_mask))
-                        return -EFAULT;
-                siginitset(&new_ka.sa.sa_mask, mask);
-        }
-
-        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
-        if (!ret && oact) {
-                if (verify_area(VERIFY_WRITE, oact, sizeof(*oact)) ||
-                    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-                    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
-                    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
-                    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
-                        return -EFAULT;
-        }
-
-        return ret;
-}
-
-/*
- * set alternate signal stack syscall
- */
-asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t *uoss)
-{
-        return do_sigaltstack(uss, uoss, current_frame()->sp);
-}
-
-/*
  * do a signal return; undo the signal stack.
  */
 static int restore_sigcontext(struct pt_regs *regs,
@@ -193,8 +140,7 @@ asmlinkage long sys_rt_sigreturn(void)
         if (restore_sigcontext(current_frame(), &frame->uc.uc_mcontext, &d0))
                 goto badframe;
 
-        if (do_sigaltstack(&frame->uc.uc_stack, NULL, current_frame()->sp) ==
-            -EFAULT)
+        if (restore_altstack(&frame->uc.uc_stack))
                 goto badframe;
 
         return d0;
@@ -359,9 +305,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
         /* create the ucontext.  */
         if (__put_user(0, &frame->uc.uc_flags) ||
             __put_user(0, &frame->uc.uc_link) ||
-            __put_user((void *)current->sas_ss_sp, &frame->uc.uc_stack.ss_sp) ||
-            __put_user(sas_ss_flags(regs->sp), &frame->uc.uc_stack.ss_flags) ||
-            __put_user(current->sas_ss_size, &frame->uc.uc_stack.ss_size) ||
+            __save_altstack(&frame->uc.uc_stack, regs->sp) ||
             setup_sigcontext(&frame->uc.uc_mcontext,
                              &frame->fpuctx, regs, set->sig[0]) ||
             __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set)))