[PATCH] m32r: security fix of {get,put}_user macros

[linux-2.6-omap-h63xx.git] / arch / m32r / kernel / signal.c

diff --git a/arch/m32r/kernel/signal.c b/arch/m32r/kernel/signal.c
index 71763f7a1d1989eb0cda8196694e07043a47ce52..cb33097fefc4453475451d31443b2e380b97f0d5 100644 (file)
--- a/arch/m32r/kernel/signal.c
+++ b/arch/m32r/kernel/signal.c
@@ -36,7 +36,7 @@ int do_signal(struct pt_regs *, sigset_t *);
 asmlinkage int
 sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
                  unsigned long r2, unsigned long r3, unsigned long r4,
-                 unsigned long r5, unsigned long r6, struct pt_regs regs)
+                 unsigned long r5, unsigned long r6, struct pt_regs *regs)
 {
        sigset_t saveset, newset;
 
@@ -54,21 +54,21 @@ sys_rt_sigsuspend(sigset_t *unewset, size_t sigsetsize,
        recalc_sigpending();
        spin_unlock_irq(&current->sighand->siglock);
 
-       regs.r0 = -EINTR;
+       regs->r0 = -EINTR;
        while (1) {
                current->state = TASK_INTERRUPTIBLE;
                schedule();
-               if (do_signal(&regs, &saveset))
-                       return regs.r0;
+               if (do_signal(regs, &saveset))
+                       return regs->r0;
        }
 }
 
 asmlinkage int
 sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
                unsigned long r2, unsigned long r3, unsigned long r4,
-               unsigned long r5, unsigned long r6, struct pt_regs regs)
+               unsigned long r5, unsigned long r6, struct pt_regs *regs)
 {
-       return do_sigaltstack(uss, uoss, regs.spu);
+       return do_sigaltstack(uss, uoss, regs->spu);
 }
 
 
@@ -140,11 +140,10 @@ restore_sigcontext(struct pt_regs *regs, struct sigcontext __user *sc,
 asmlinkage int
 sys_rt_sigreturn(unsigned long r0, unsigned long r1,
                 unsigned long r2, unsigned long r3, unsigned long r4,
-                unsigned long r5, unsigned long r6, struct pt_regs regs)
+                unsigned long r5, unsigned long r6, struct pt_regs *regs)
 {
-       struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs.spu;
+       struct rt_sigframe __user *frame = (struct rt_sigframe __user *)regs->spu;
        sigset_t set;
-       stack_t st;
        int result;
 
        if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
@@ -158,14 +157,11 @@ sys_rt_sigreturn(unsigned long r0, unsigned long r1,
        recalc_sigpending();
        spin_unlock_irq(&current->sighand->siglock);
 
-       if (restore_sigcontext(&regs, &frame->uc.uc_mcontext, &result))
+       if (restore_sigcontext(regs, &frame->uc.uc_mcontext, &result))
                goto badframe;
 
-       if (__copy_from_user(&st, &frame->uc.uc_stack, sizeof(st)))
+       if (do_sigaltstack(&frame->uc.uc_stack, NULL, regs->spu) == -EFAULT)
                goto badframe;
-       /* It is more difficult to avoid calling this function than to
-          call it and ignore errors.  */
-       do_sigaltstack(&st, NULL, regs.spu);
 
        return result;