linux-kernel - Re: [PATCH v2 1/2] x86_64,signal: Fix SS handling for signals delivered to 64-bit programs

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Message-ID: <20150310164211.GA8642@redhat.com>
Date:	Tue, 10 Mar 2015 17:42:11 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Ingo Molnar <mingo@...nel.org>, Andi Kleen <andi@...stfloor.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Al Viro <viro@...iv.linux.org.uk>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH v2 1/2] x86_64,signal: Fix SS handling for signals
	delivered to 64-bit programs

Well, the patch looks "obviously fine" to me, but this is all I can say.

I mean, I simply can't understand this __pad0/ifdef(CONFIG_X86_32), it
looks as if ->ss was specially excluded for unknown reason from the very
beginning.

On 03/10, Andy Lutomirski wrote:
>
> > --- a/arch/x86/include/uapi/asm/sigcontext.h
> > +++ b/arch/x86/include/uapi/asm/sigcontext.h
> > @@ -179,7 +179,7 @@ struct sigcontext {
> >         __u16 cs;
> >         __u16 gs;
> >         __u16 fs;
> > -       __u16 __pad0;
> > +       __u16 ss;

I do not know the rules for include/uapi/ ...

OK, nobody should ever use __pad0, so probably it is safe to rename it.
OTOH, an application can (say) try to print all members for debugging
purposes, it won't compile after this change.

Oleg.

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