sparc64: not any error from do_sigaltstack() should fail rt_sigreturn()
If a signal handler is executed on altstack and another signal comes, we will end up with rt_sigreturn() on return from the second handler getting -EPERM from do_sigaltstack(). It's perfectly OK, since we are not asking to change the settings; in fact, they couldn't have been changed during the second handler execution exactly because we'd been on altstack all along. 64bit sigreturn on sparc treats any error from do_sigaltstack() as "SIGSEGV now"; we need to switch to the same semantics we are using on other architectures. Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -295,9 +295,7 @@ void do_rt_sigreturn(struct pt_regs *regs)
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err |= restore_fpu_state(regs, fpu_save);
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err |= __copy_from_user(&set, &sf->mask, sizeof(sigset_t));
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err |= do_sigaltstack(&sf->stack, NULL, (unsigned long)sf);
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if (err)
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if (err || do_sigaltstack(&sf->stack, NULL, (unsigned long)sf) == -EFAULT)
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goto segv;
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err |= __get_user(rwin_save, &sf->rwin_save);
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