1 files changed, 68 insertions, 259 deletions

diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index 463f6bb44d0..33cab9a8adf 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -7,22 +7,20 @@
  * Derived from i386 and Alpha versions.
  */
 
-#include <linux/config.h>
 #include <linux/errno.h>
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/ptrace.h>
+#include <linux/tracehook.h>
 #include <linux/sched.h>
 #include <linux/signal.h>
 #include <linux/smp.h>
-#include <linux/smp_lock.h>
 #include <linux/stddef.h>
 #include <linux/tty.h>
 #include <linux/binfmts.h>
 #include <linux/unistd.h>
 #include <linux/wait.h>
 
-#include <asm/ia32.h>
 #include <asm/intrinsics.h>
 #include <asm/uaccess.h>
 #include <asm/rse.h>
@@ -32,7 +30,6 @@
 
 #define DEBUG_SIG	0
 #define STACK_ALIGN	16		/* minimal alignment for stack pointer */
-#define _BLOCKABLE	(~(sigmask(SIGKILL) | sigmask(SIGSTOP)))
 
 #if _NSIG_WORDS > 1
 # define PUT_SIGSET(k,u)	__copy_to_user((u)->sig, (k)->sig, sizeof(sigset_t))
@@ -42,55 +39,6 @@
 # define GET_SIGSET(k,u)	__get_user((k)->sig[0], &(u)->sig[0])
 #endif
 
-long
-ia64_rt_sigsuspend (sigset_t __user *uset, size_t sigsetsize, struct sigscratch *scr)
-{
-	sigset_t oldset, set;
-
-	/* XXX: Don't preclude handling different sized sigset_t's.  */
-	if (sigsetsize != sizeof(sigset_t))
-		return -EINVAL;
-
-	if (!access_ok(VERIFY_READ, uset, sigsetsize))
-		return -EFAULT;
-
-	if (GET_SIGSET(&set, uset))
-		return -EFAULT;
-
-	sigdelsetmask(&set, ~_BLOCKABLE);
-
-	spin_lock_irq(&current->sighand->siglock);
-	{
-		oldset = current->blocked;
-		current->blocked = set;
-		recalc_sigpending();
-	}
-	spin_unlock_irq(&current->sighand->siglock);
-
-	/*
-	 * The return below usually returns to the signal handler.  We need to
-	 * pre-set the correct error code here to ensure that the right values
-	 * get saved in sigcontext by ia64_do_signal.
-	 */
-	scr->pt.r8 = EINTR;
-	scr->pt.r10 = -1;
-
-	while (1) {
-		current->state = TASK_INTERRUPTIBLE;
-		schedule();
-		if (ia64_do_signal(&oldset, scr, 1))
-			return -EINTR;
-	}
-}
-
-asmlinkage long
-sys_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, long arg2,
-		 long arg3, long arg4, long arg5, long arg6, long arg7,
-		 struct pt_regs regs)
-{
-	return do_sigaltstack(uss, uoss, regs.r12);
-}
-
 static long
 restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
 {
@@ -141,7 +89,7 @@ restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
 	if ((flags & IA64_SC_FLAG_FPH_VALID) != 0) {
 		struct ia64_psr *psr = ia64_psr(&scr->pt);
 
-		__copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
+		err |= __copy_from_user(current->thread.fph, &sc->sc_fr[32], 96*16);
 		psr->mfh = 0;	/* drop signal handler's fph contents... */
 		preempt_disable();
 		if (psr->dfh)
@@ -157,7 +105,7 @@ restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
 }
 
 int
-copy_siginfo_to_user (siginfo_t __user *to, siginfo_t *from)
+copy_siginfo_to_user (siginfo_t __user *to, const siginfo_t *from)
 {
 	if (!access_ok(VERIFY_WRITE, to, sizeof(siginfo_t)))
 		return -EFAULT;
@@ -243,14 +191,7 @@ ia64_rt_sigreturn (struct sigscratch *scr)
 	if (GET_SIGSET(&set, &sc->sc_mask))
 		goto give_sigsegv;
 
-	sigdelsetmask(&set, ~_BLOCKABLE);
-
-	spin_lock_irq(&current->sighand->siglock);
-	{
-		current->blocked = set;
-		recalc_sigpending();
-	}
-	spin_unlock_irq(&current->sighand->siglock);
+	set_current_blocked(&set);
 
 	if (restore_sigcontext(sc, scr))
 		goto give_sigsegv;
@@ -259,19 +200,16 @@ ia64_rt_sigreturn (struct sigscratch *scr)
 	printk("SIG return (%s:%d): sp=%lx ip=%lx\n",
 	       current->comm, current->pid, scr->pt.r12, scr->pt.cr_iip);
 #endif
-	/*
-	 * It is more difficult to avoid calling this function than to
-	 * call it and ignore errors.
-	 */
-	do_sigaltstack(&sc->sc_stack, NULL, scr->pt.r12);
+	if (restore_altstack(&sc->sc_stack))
+		goto give_sigsegv;
 	return retval;
 
   give_sigsegv:
 	si.si_signo = SIGSEGV;
 	si.si_errno = 0;
 	si.si_code = SI_KERNEL;
-	si.si_pid = current->pid;
-	si.si_uid = current->uid;
+	si.si_pid = task_pid_vnr(current);
+	si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
 	si.si_addr = sc;
 	force_sig_info(SIGSEGV, &si, current);
 	return retval;
@@ -287,7 +225,7 @@ static long
 setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratch *scr)
 {
 	unsigned long flags = 0, ifs, cfm, nat;
-	long err;
+	long err = 0;
 
 	ifs = scr->pt.cr_ifs;
 
@@ -300,12 +238,12 @@ setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratc
 	ia64_flush_fph(current);
 	if ((current->thread.flags & IA64_THREAD_FPH_VALID)) {
 		flags |= IA64_SC_FLAG_FPH_VALID;
-		__copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
+		err = __copy_to_user(&sc->sc_fr[32], current->thread.fph, 96*16);
 	}
 
 	nat = ia64_get_scratch_nat_bits(&scr->pt, scr->scratch_unat);
 
-	err  = __put_user(flags, &sc->sc_flags);
+	err |= __put_user(flags, &sc->sc_flags);
 	err |= __put_user(nat, &sc->sc_nat);
 	err |= PUT_SIGSET(mask, &sc->sc_mask);
 	err |= __put_user(cfm, &sc->sc_cfm);
@@ -323,15 +261,7 @@ setup_sigcontext (struct sigcontext __user *sc, sigset_t *mask, struct sigscratc
 	err |= __copy_to_user(&sc->sc_gr[15], &scr->pt.r15, 8);		/* r15 */
 	err |= __put_user(scr->pt.cr_iip + ia64_psr(&scr->pt)->ri, &sc->sc_ip);
 
-	if (flags & IA64_SC_FLAG_IN_SYSCALL) {
-		/* Clear scratch registers if the signal interrupted a system call. */
-		err |= __put_user(0, &sc->sc_ar_ccv);				/* ar.ccv */
-		err |= __put_user(0, &sc->sc_br[7]);				/* b7 */
-		err |= __put_user(0, &sc->sc_gr[14]);				/* r14 */
-		err |= __clear_user(&sc->sc_ar25, 2*8);			/* ar.csd & ar.ssd */
-		err |= __clear_user(&sc->sc_gr[2], 2*8);			/* r2-r3 */
-		err |= __clear_user(&sc->sc_gr[16], 16*8);			/* r16-r31 */
-	} else {
+	if (!(flags & IA64_SC_FLAG_IN_SYSCALL)) {
 		/* Copy scratch regs to sigcontext if the signal didn't interrupt a syscall. */
 		err |= __put_user(scr->pt.ar_ccv, &sc->sc_ar_ccv);		/* ar.ccv */
 		err |= __put_user(scr->pt.b7, &sc->sc_br[7]);			/* b7 */
@@ -375,8 +305,8 @@ force_sigsegv_info (int sig, void __user *addr)
 	si.si_signo = SIGSEGV;
 	si.si_errno = 0;
 	si.si_code = SI_KERNEL;
-	si.si_pid = current->pid;
-	si.si_uid = current->uid;
+	si.si_pid = task_pid_vnr(current);
+	si.si_uid = from_kuid_munged(current_user_ns(), current_uid());
 	si.si_addr = addr;
 	force_sig_info(SIGSEGV, &si, current);
 	return 0;
@@ -393,15 +323,33 @@ setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
 
 	new_sp = scr->pt.r12;
 	tramp_addr = (unsigned long) __kernel_sigtramp;
-	if ((ka->sa.sa_flags & SA_ONSTACK) && sas_ss_flags(new_sp) == 0) {
-		new_sp = current->sas_ss_sp + current->sas_ss_size;
-		/*
-		 * We need to check for the register stack being on the signal stack
-		 * separately, because it's switched separately (memory stack is switched
-		 * in the kernel, register stack is switched in the signal trampoline).
-		 */
-		if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
-			new_rbs = (current->sas_ss_sp + sizeof(long) - 1) & ~(sizeof(long) - 1);
+	if (ka->sa.sa_flags & SA_ONSTACK) {
+		int onstack = sas_ss_flags(new_sp);
+
+		if (onstack == 0) {
+			new_sp = current->sas_ss_sp + current->sas_ss_size;
+			/*
+			 * We need to check for the register stack being on the
+			 * signal stack separately, because it's switched
+			 * separately (memory stack is switched in the kernel,
+			 * register stack is switched in the signal trampoline).
+			 */
+			if (!rbs_on_sig_stack(scr->pt.ar_bspstore))
+				new_rbs = ALIGN(current->sas_ss_sp,
+						sizeof(long));
+		} else if (onstack == SS_ONSTACK) {
+			unsigned long check_sp;
+
+			/*
+			 * If we are on the alternate signal stack and would
+			 * overflow it, don't. Return an always-bogus address
+			 * instead so we will die with SIGSEGV.
+			 */
+			check_sp = (new_sp - sizeof(*frame)) & -STACK_ALIGN;
+			if (!likely(on_sig_stack(check_sp)))
+				return force_sigsegv_info(sig, (void __user *)
+							  check_sp);
+		}
 	}
 	frame = (void __user *) ((new_sp - sizeof(*frame)) & -STACK_ALIGN);
 
@@ -417,9 +365,7 @@ setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
 
 	err |= copy_siginfo_to_user(&frame->info, info);
 
-	err |= __put_user(current->sas_ss_sp, &frame->sc.sc_stack.ss_sp);
-	err |= __put_user(current->sas_ss_size, &frame->sc.sc_stack.ss_size);
-	err |= __put_user(sas_ss_flags(scr->pt.r12), &frame->sc.sc_stack.ss_flags);
+	err |= __save_altstack(&frame->sc.sc_stack, scr->pt.r12);
 	err |= setup_sigcontext(&frame->sc, set, scr);
 
 	if (unlikely(err))
@@ -454,24 +400,15 @@ setup_frame (int sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *set,
 }
 
 static long
-handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigset_t *oldset,
+handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
 	       struct sigscratch *scr)
 {
-	if (IS_IA32_PROCESS(&scr->pt)) {
-		/* send signal to IA-32 process */
-		if (!ia32_setup_frame1(sig, ka, info, oldset, &scr->pt))
-			return 0;
-	} else
-		/* send signal to IA-64 process */
-		if (!setup_frame(sig, ka, info, oldset, scr))
-			return 0;
-
-	spin_lock_irq(&current->sighand->siglock);
-	sigorsets(&current->blocked, &current->blocked, &ka->sa.sa_mask);
-	if (!(ka->sa.sa_flags & SA_NODEFER))
-		sigaddset(&current->blocked, sig);
-	recalc_sigpending();
-	spin_unlock_irq(&current->sighand->siglock);
+	if (!setup_frame(sig, ka, info, sigmask_to_save(), scr))
+		return 0;
+
+	signal_delivered(sig, info, ka, &scr->pt,
+				 test_thread_flag(TIF_SINGLESTEP));
+
 	return 1;
 }
 
@@ -479,25 +416,13 @@ handle_signal (unsigned long sig, struct k_sigaction *ka, siginfo_t *info, sigse
  * Note that `init' is a special process: it doesn't get signals it doesn't want to
  * handle.  Thus you cannot kill init even with a SIGKILL even by mistake.
  */
-long
-ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
+void
+ia64_do_signal (struct sigscratch *scr, long in_syscall)
 {
 	struct k_sigaction ka;
 	siginfo_t info;
 	long restart = in_syscall;
 	long errno = scr->pt.r8;
-#	define ERR_CODE(c)	(IS_IA32_PROCESS(&scr->pt) ? -(c) : (c))
-
-	/*
-	 * In the ia64_leave_kernel code path, we want the common case to go fast, which
-	 * is why we may in certain cases get here from kernel mode. Just return without
-	 * doing anything if so.
-	 */
-	if (!user_mode(&scr->pt))
-		return 0;
-
-	if (!oldset)
-		oldset = &current->blocked;
 
 	/*
 	 * This only loops in the rare cases of handle_signal() failing, in which case we
@@ -512,14 +437,7 @@ ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
 		 * inferior call), thus it's important to check for restarting _after_
 		 * get_signal_to_deliver().
 		 */
-		if (IS_IA32_PROCESS(&scr->pt)) {
-			if (in_syscall) {
-				if (errno >= 0)
-					restart = 0;
-				else
-					errno = -errno;
-			}
-		} else if ((long) scr->pt.r10 != -1)
+		if ((long) scr->pt.r10 != -1)
 			/*
 			 * A system calls has to be restarted only if one of the error codes
 			 * ERESTARTNOHAND, ERESTARTSYS, or ERESTARTNOINTR is returned.  If r10
@@ -535,22 +453,18 @@ ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
 			switch (errno) {
 			      case ERESTART_RESTARTBLOCK:
 			      case ERESTARTNOHAND:
-				scr->pt.r8 = ERR_CODE(EINTR);
+				scr->pt.r8 = EINTR;
 				/* note: scr->pt.r10 is already -1 */
 				break;
 
 			      case ERESTARTSYS:
 				if ((ka.sa.sa_flags & SA_RESTART) == 0) {
-					scr->pt.r8 = ERR_CODE(EINTR);
+					scr->pt.r8 = EINTR;
 					/* note: scr->pt.r10 is already -1 */
 					break;
 				}
 			      case ERESTARTNOINTR:
-				if (IS_IA32_PROCESS(&scr->pt)) {
-					scr->pt.r8 = scr->pt.r1;
-					scr->pt.cr_iip -= 2;
-				} else
-					ia64_decrement_ip(&scr->pt);
+				ia64_decrement_ip(&scr->pt);
 				restart = 0; /* don't restart twice if handle_signal() fails... */
 			}
 		}
@@ -559,8 +473,8 @@ ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
 		 * Whee!  Actually deliver the signal.  If the delivery failed, we need to
 		 * continue to iterate in this loop so we can deliver the SIGSEGV...
 		 */
-		if (handle_signal(signr, &ka, &info, oldset, scr))
-			return 1;
+		if (handle_signal(signr, &ka, &info, scr))
+			return;
 	}
 
 	/* Did we come from a system call? */
@@ -569,123 +483,18 @@ ia64_do_signal (sigset_t *oldset, struct sigscratch *scr, long in_syscall)
 		if (errno == ERESTARTNOHAND || errno == ERESTARTSYS || errno == ERESTARTNOINTR
 		    || errno == ERESTART_RESTARTBLOCK)
 		{
-			if (IS_IA32_PROCESS(&scr->pt)) {
-				scr->pt.r8 = scr->pt.r1;
-				scr->pt.cr_iip -= 2;
-				if (errno == ERESTART_RESTARTBLOCK)
-					scr->pt.r8 = 0;	/* x86 version of __NR_restart_syscall */
-			} else {
-				/*
-				 * Note: the syscall number is in r15 which is saved in
-				 * pt_regs so all we need to do here is adjust ip so that
-				 * the "break" instruction gets re-executed.
-				 */
-				ia64_decrement_ip(&scr->pt);
-				if (errno == ERESTART_RESTARTBLOCK)
-					scr->pt.r15 = __NR_restart_syscall;
-			}
-		}
-	}
-	return 0;
-}
-
-/* Set a delayed signal that was detected in MCA/INIT/NMI/PMI context where it
- * could not be delivered.  It is important that the target process is not
- * allowed to do any more work in user space.  Possible cases for the target
- * process:
- *
- * - It is sleeping and will wake up soon.  Store the data in the current task,
- *   the signal will be sent when the current task returns from the next
- *   interrupt.
- *
- * - It is running in user context.  Store the data in the current task, the
- *   signal will be sent when the current task returns from the next interrupt.
- *
- * - It is running in kernel context on this or another cpu and will return to
- *   user context.  Store the data in the target task, the signal will be sent
- *   to itself when the target task returns to user space.
- *
- * - It is running in kernel context on this cpu and will sleep before
- *   returning to user context.  Because this is also the current task, the
- *   signal will not get delivered and the task could sleep indefinitely.
- *   Store the data in the idle task for this cpu, the signal will be sent
- *   after the idle task processes its next interrupt.
- *
- * To cover all cases, store the data in the target task, the current task and
- * the idle task on this cpu.  Whatever happens, the signal will be delivered
- * to the target task before it can do any useful user space work.  Multiple
- * deliveries have no unwanted side effects.
- *
- * Note: This code is executed in MCA/INIT/NMI/PMI context, with interrupts
- * disabled.  It must not take any locks nor use kernel structures or services
- * that require locks.
- */
-
-/* To ensure that we get the right pid, check its start time.  To avoid extra
- * include files in thread_info.h, convert the task start_time to unsigned long,
- * giving us a cycle time of > 580 years.
- */
-static inline unsigned long
-start_time_ul(const struct task_struct *t)
-{
-	return t->start_time.tv_sec * NSEC_PER_SEC + t->start_time.tv_nsec;
-}
-
-void
-set_sigdelayed(pid_t pid, int signo, int code, void __user *addr)
-{
-	struct task_struct *t;
-	unsigned long start_time =  0;
-	int i;
-
-	for (i = 1; i <= 3; ++i) {
-		switch (i) {
-		case 1:
-			t = find_task_by_pid(pid);
-			if (t)
-				start_time = start_time_ul(t);
-			break;
-		case 2:
-			t = current;
-			break;
-		default:
-			t = idle_task(smp_processor_id());
-			break;
+			/*
+			 * Note: the syscall number is in r15 which is saved in
+			 * pt_regs so all we need to do here is adjust ip so that
+			 * the "break" instruction gets re-executed.
+			 */
+			ia64_decrement_ip(&scr->pt);
+			if (errno == ERESTART_RESTARTBLOCK)
+				scr->pt.r15 = __NR_restart_syscall;
 		}
-
-		if (!t)
-			return;
-		task_thread_info(t)->sigdelayed.signo = signo;
-		task_thread_info(t)->sigdelayed.code = code;
-		task_thread_info(t)->sigdelayed.addr = addr;
-		task_thread_info(t)->sigdelayed.start_time = start_time;
-		task_thread_info(t)->sigdelayed.pid = pid;
-		wmb();
-		set_tsk_thread_flag(t, TIF_SIGDELAYED);
 	}
-}
-
-/* Called from entry.S when it detects TIF_SIGDELAYED, a delayed signal that
- * was detected in MCA/INIT/NMI/PMI context where it could not be delivered.
- */
 
-void
-do_sigdelayed(void)
-{
-	struct siginfo siginfo;
-	pid_t pid;
-	struct task_struct *t;
-
-	clear_thread_flag(TIF_SIGDELAYED);
-	memset(&siginfo, 0, sizeof(siginfo));
-	siginfo.si_signo = current_thread_info()->sigdelayed.signo;
-	siginfo.si_code = current_thread_info()->sigdelayed.code;
-	siginfo.si_addr = current_thread_info()->sigdelayed.addr;
-	pid = current_thread_info()->sigdelayed.pid;
-	t = find_task_by_pid(pid);
-	if (!t)
-		return;
-	if (current_thread_info()->sigdelayed.start_time != start_time_ul(t))
-		return;
-	force_sig_info(siginfo.si_signo, &siginfo, t);
+	/* if there's no signal to deliver, we just put the saved sigmask
+	 * back */
+	restore_saved_sigmask();
 }