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@@ -428,6 +428,10 @@ get_sigframe(struct k_sigaction *ka, struct pt_regs * regs, size_t frame_size)
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/* Default to using normal stack */
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sp = (unsigned long) A(regs->gprs[15]);
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+ /* Overflow on alternate signal stack gives SIGSEGV. */
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+ if (on_sig_stack(sp) && !on_sig_stack((sp - frame_size) & -8UL))
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+ return (void __user *) -1UL;
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+
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/* This is the X/Open sanctioned signal stack switching. */
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if (ka->sa.sa_flags & SA_ONSTACK) {
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if (! sas_ss_flags(sp))
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@@ -461,6 +465,9 @@ static int setup_frame32(int sig, struct k_sigaction *ka,
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if (!access_ok(VERIFY_WRITE, frame, sizeof(sigframe32)))
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goto give_sigsegv;
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+ if (frame == (void __user *) -1UL)
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+ goto give_sigsegv;
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+
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if (__copy_to_user(&frame->sc.oldmask, &set->sig, _SIGMASK_COPY_SIZE32))
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goto give_sigsegv;
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@@ -514,6 +521,9 @@ static int setup_rt_frame32(int sig, struct k_sigaction *ka, siginfo_t *info,
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if (!access_ok(VERIFY_WRITE, frame, sizeof(rt_sigframe32)))
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goto give_sigsegv;
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+ if (frame == (void __user *) -1UL)
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+ goto give_sigsegv;
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+
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if (copy_siginfo_to_user32(&frame->info, info))
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goto give_sigsegv;
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