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()
  ...

5 files changed, 4 insertions, 244 deletions

diff --git a/arch/arm64/kernel/entry.S b/arch/arm64/kernel/entry.S
index 9c94f404ded6..514d6098dbee 100644
--- a/arch/arm64/kernel/entry.S
+++ b/arch/arm64/kernel/entry.S
@@ -677,10 +677,5 @@ ENTRY(sys_rt_sigreturn_wrapper)
 	b	sys_rt_sigreturn
 ENDPROC(sys_rt_sigreturn_wrapper)
 
-ENTRY(sys_sigaltstack_wrapper)
-	ldr	x2, [sp, #S_SP]
-	b	sys_sigaltstack
-ENDPROC(sys_sigaltstack_wrapper)
-
 ENTRY(handle_arch_irq)
 	.quad	0
diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
index abd756315cb5..890a591f75dd 100644
--- a/arch/arm64/kernel/signal.c
+++ b/arch/arm64/kernel/signal.c
@@ -149,8 +149,7 @@ asmlinkage long sys_rt_sigreturn(struct pt_regs *regs)
 	if (restore_sigframe(regs, frame))
 		goto badframe;
 
-	if (do_sigaltstack(&frame->uc.uc_stack,
-			   NULL, regs->sp) == -EFAULT)
+	if (restore_altstack(&frame->uc.uc_stack))
 		goto badframe;
 
 	return regs->regs[0];
@@ -164,12 +163,6 @@ badframe:
 	return 0;
 }
 
-asmlinkage long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
-				unsigned long sp)
-{
-	return do_sigaltstack(uss, uoss, sp);
-}
-
 static int setup_sigframe(struct rt_sigframe __user *sf,
 			  struct pt_regs *regs, sigset_t *set)
 {
@@ -250,7 +243,6 @@ static int setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
 			  sigset_t *set, struct pt_regs *regs)
 {
 	struct rt_sigframe __user *frame;
-	stack_t stack;
 	int err = 0;
 
 	frame = get_sigframe(ka, regs);
@@ -260,12 +252,7 @@ static int setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
 	__put_user_error(0, &frame->uc.uc_flags, err);
 	__put_user_error(NULL, &frame->uc.uc_link, err);
 
-	memset(&stack, 0, sizeof(stack));
-	stack.ss_sp = (void __user *)current->sas_ss_sp;
-	stack.ss_flags = sas_ss_flags(regs->sp);
-	stack.ss_size = current->sas_ss_size;
-	err |= __copy_to_user(&frame->uc.uc_stack, &stack, sizeof(stack));
-
+	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
 	err |= setup_sigframe(frame, regs, set);
 	if (err == 0) {
 		setup_return(regs, ka, frame, usig);
diff --git a/arch/arm64/kernel/signal32.c b/arch/arm64/kernel/signal32.c
index 41db148a7eb9..7f4f3673f2bc 100644
--- a/arch/arm64/kernel/signal32.c
+++ b/arch/arm64/kernel/signal32.c
@@ -28,26 +28,6 @@
 #include <asm/uaccess.h>
 #include <asm/unistd32.h>
 
-struct compat_sigaction {
-	compat_uptr_t			sa_handler;
-	compat_ulong_t			sa_flags;
-	compat_uptr_t			sa_restorer;
-	compat_sigset_t			sa_mask;
-};
-
-struct compat_old_sigaction {
-	compat_uptr_t			sa_handler;
-	compat_old_sigset_t		sa_mask;
-	compat_ulong_t			sa_flags;
-	compat_uptr_t			sa_restorer;
-};
-
-typedef struct compat_sigaltstack {
-	compat_uptr_t			ss_sp;
-	int				ss_flags;
-	compat_size_t			ss_size;
-} compat_stack_t;
-
 struct compat_sigcontext {
 	/* We always set these two fields to 0 */
 	compat_ulong_t			trap_no;
@@ -339,127 +319,6 @@ static int compat_restore_vfp_context(struct compat_vfp_sigframe __user *frame)
 	return err ? -EFAULT : 0;
 }
 
-/*
- * atomically swap in the new signal mask, and wait for a signal.
- */
-asmlinkage int compat_sys_sigsuspend(int restart, compat_ulong_t oldmask,
-				     compat_old_sigset_t mask)
-{
-	sigset_t blocked;
-
-	siginitset(&current->blocked, mask);
-	return sigsuspend(&blocked);
-}
-
-asmlinkage int compat_sys_sigaction(int sig,
-				    const struct compat_old_sigaction __user *act,
-				    struct compat_old_sigaction __user *oact)
-{
-	struct k_sigaction new_ka, old_ka;
-	int ret;
-	compat_old_sigset_t mask;
-	compat_uptr_t handler, restorer;
-
-	if (act) {
-		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
-		    __get_user(handler, &act->sa_handler) ||
-		    __get_user(restorer, &act->sa_restorer) ||
-		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
-		    __get_user(mask, &act->sa_mask))
-			return -EFAULT;
-
-		new_ka.sa.sa_handler = compat_ptr(handler);
-		new_ka.sa.sa_restorer = compat_ptr(restorer);
-		siginitset(&new_ka.sa.sa_mask, mask);
-	}
-
-	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
-	if (!ret && oact) {
-		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
-		    __put_user(ptr_to_compat(old_ka.sa.sa_handler),
-			       &oact->sa_handler) ||
-		    __put_user(ptr_to_compat(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;
-}
-
-asmlinkage int compat_sys_rt_sigaction(int sig,
-				       const struct compat_sigaction __user *act,
-				       struct compat_sigaction __user *oact,
-				       compat_size_t sigsetsize)
-{
-	struct k_sigaction new_ka, old_ka;
-	int ret;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(compat_sigset_t))
-		return -EINVAL;
-
-	if (act) {
-		compat_uptr_t handler, restorer;
-
-		ret = get_user(handler, &act->sa_handler);
-		new_ka.sa.sa_handler = compat_ptr(handler);
-		ret |= get_user(restorer, &act->sa_restorer);
-		new_ka.sa.sa_restorer = compat_ptr(restorer);
-		ret |= get_sigset_t(&new_ka.sa.sa_mask, &act->sa_mask);
-		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
-		if (ret)
-			return -EFAULT;
-	}
-
-	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-	if (!ret && oact) {
-		ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
-		ret |= put_sigset_t(&oact->sa_mask, &old_ka.sa.sa_mask);
-		ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-	}
-	return ret;
-}
-
-int compat_do_sigaltstack(compat_uptr_t compat_uss, compat_uptr_t compat_uoss,
-			  compat_ulong_t sp)
-{
-	compat_stack_t __user *newstack = compat_ptr(compat_uss);
-	compat_stack_t __user *oldstack = compat_ptr(compat_uoss);
-	compat_uptr_t ss_sp;
-	int ret;
-	mm_segment_t old_fs;
-	stack_t uss, uoss;
-
-	/* Marshall the compat new stack into a stack_t */
-	if (newstack) {
-		if (get_user(ss_sp, &newstack->ss_sp) ||
-		    __get_user(uss.ss_flags, &newstack->ss_flags) ||
-		    __get_user(uss.ss_size, &newstack->ss_size))
-			return -EFAULT;
-		uss.ss_sp = compat_ptr(ss_sp);
-	}
-
-	old_fs = get_fs();
-	set_fs(KERNEL_DS);
-	/* The __user pointer casts are valid because of the set_fs() */
-	ret = do_sigaltstack(
-		newstack ? (stack_t __user *) &uss : NULL,
-		oldstack ? (stack_t __user *) &uoss : NULL,
-		(unsigned long)sp);
-	set_fs(old_fs);
-
-	/* Convert the old stack_t into a compat stack. */
-	if (!ret && oldstack &&
-		(put_user(ptr_to_compat(uoss.ss_sp), &oldstack->ss_sp) ||
-		 __put_user(uoss.ss_flags, &oldstack->ss_flags) ||
-		 __put_user(uoss.ss_size, &oldstack->ss_size)))
-		return -EFAULT;
-	return ret;
-}
-
 static int compat_restore_sigframe(struct pt_regs *regs,
 				   struct compat_sigframe __user *sf)
 {
@@ -562,9 +421,7 @@ asmlinkage int compat_sys_rt_sigreturn(struct pt_regs *regs)
 	if (compat_restore_sigframe(regs, &frame->sig))
 		goto badframe;
 
-	if (compat_do_sigaltstack(ptr_to_compat(&frame->sig.uc.uc_stack),
-				 ptr_to_compat((void __user *)NULL),
-				 regs->compat_sp) == -EFAULT)
+	if (compat_restore_altstack(&frame->sig.uc.uc_stack))
 		goto badframe;
 
 	return regs->regs[0];
@@ -705,11 +562,7 @@ int compat_setup_rt_frame(int usig, struct k_sigaction *ka, siginfo_t *info,
 	__put_user_error(0, &frame->sig.uc.uc_flags, err);
 	__put_user_error(0, &frame->sig.uc.uc_link, err);
 
-	memset(&stack, 0, sizeof(stack));
-	stack.ss_sp = (compat_uptr_t)current->sas_ss_sp;
-	stack.ss_flags = sas_ss_flags(regs->compat_sp);
-	stack.ss_size = current->sas_ss_size;
-	err |= __copy_to_user(&frame->sig.uc.uc_stack, &stack, sizeof(stack));
+	err |= __compat_save_altstack(&frame->sig.uc.uc_stack, regs->compat_sp);
 
 	err |= compat_setup_sigframe(&frame->sig, regs, set);
 
@@ -742,75 +595,6 @@ int compat_setup_frame(int usig, struct k_sigaction *ka, sigset_t *set,
 	return err;
 }
 
-/*
- * RT signals don't have generic compat wrappers.
- * See arch/powerpc/kernel/signal_32.c
- */
-asmlinkage int compat_sys_rt_sigprocmask(int how, compat_sigset_t __user *set,
-					 compat_sigset_t __user *oset,
-					 compat_size_t sigsetsize)
-{
-	sigset_t s;
-	sigset_t __user *up;
-	int ret;
-	mm_segment_t old_fs = get_fs();
-
-	if (set) {
-		if (get_sigset_t(&s, set))
-			return -EFAULT;
-	}
-
-	set_fs(KERNEL_DS);
-	/* This is valid because of the set_fs() */
-	up = (sigset_t __user *) &s;
-	ret = sys_rt_sigprocmask(how, set ? up : NULL, oset ? up : NULL,
-				 sigsetsize);
-	set_fs(old_fs);
-	if (ret)
-		return ret;
-	if (oset) {
-		if (put_sigset_t(oset, &s))
-			return -EFAULT;
-	}
-	return 0;
-}
-
-asmlinkage int compat_sys_rt_sigpending(compat_sigset_t __user *set,
-					compat_size_t sigsetsize)
-{
-	sigset_t s;
-	int ret;
-	mm_segment_t old_fs = get_fs();
-
-	set_fs(KERNEL_DS);
-	/* The __user pointer cast is valid because of the set_fs() */
-	ret = sys_rt_sigpending((sigset_t __user *) &s, sigsetsize);
-	set_fs(old_fs);
-	if (!ret) {
-		if (put_sigset_t(set, &s))
-			return -EFAULT;
-	}
-	return ret;
-}
-
-asmlinkage int compat_sys_rt_sigqueueinfo(int pid, int sig,
-					  compat_siginfo_t __user *uinfo)
-{
-	siginfo_t info;
-	int ret;
-	mm_segment_t old_fs = get_fs();
-
-	ret = copy_siginfo_from_user32(&info, uinfo);
-	if (unlikely(ret))
-		return ret;
-
-	set_fs (KERNEL_DS);
-	/* The __user pointer cast is valid because of the set_fs() */
-	ret = sys_rt_sigqueueinfo(pid, sig, (siginfo_t __user *) &info);
-	set_fs (old_fs);
-	return ret;
-}
-
 void compat_setup_restart_syscall(struct pt_regs *regs)
 {
        regs->regs[7] = __NR_compat_restart_syscall;
diff --git a/arch/arm64/kernel/sys.c b/arch/arm64/kernel/sys.c
index 8292a9b090f8..3fa98ff14f0e 100644
--- a/arch/arm64/kernel/sys.c
+++ b/arch/arm64/kernel/sys.c
@@ -40,7 +40,6 @@ asmlinkage long sys_mmap(unsigned long addr, unsigned long len,
  * Wrappers to pass the pt_regs argument.
  */
 #define sys_rt_sigreturn	sys_rt_sigreturn_wrapper
-#define sys_sigaltstack		sys_sigaltstack_wrapper
 
 #include <asm/syscalls.h>
 
diff --git a/arch/arm64/kernel/sys32.S b/arch/arm64/kernel/sys32.S
index 7ef59e9245ef..6abb05721614 100644
--- a/arch/arm64/kernel/sys32.S
+++ b/arch/arm64/kernel/sys32.S
@@ -39,11 +39,6 @@ compat_sys_rt_sigreturn_wrapper:
 	b	compat_sys_rt_sigreturn
 ENDPROC(compat_sys_rt_sigreturn_wrapper)
 
-compat_sys_sigaltstack_wrapper:
-	ldr	x2, [sp, #S_COMPAT_SP]
-	b	compat_do_sigaltstack
-ENDPROC(compat_sys_sigaltstack_wrapper)
-
 compat_sys_statfs64_wrapper:
 	mov	w3, #84
 	cmp	w1, #88