Re: sigaltstack fun

[David Miller]

From: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Date: Mon, 19 Nov 2012 02:35:07 +0000

> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>

Applied, thanks.
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