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()
  ...

1 files changed, 2 insertions, 218 deletions

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;