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Re: [PATCH 00/33] Compile-time stack metadata validation

From Andi Kleen <andi@firstfloor.org>
Newsgroups linux.kernel
Subject Re: [PATCH 00/33] Compile-time stack metadata validation
Date 2016-02-15 21:10 +0100
Message-ID <r2xD4-5Wh-19@gated-at.bofh.it> (permalink)
References (3 earlier) <r1pxW-1vA-49@gated-at.bofh.it> <r1qNl-2ew-27@gated-at.bofh.it> <r1sm5-3kI-5@gated-at.bofh.it> <r2ulR-3v3-27@gated-at.bofh.it> <r2xD5-5Wh-21@gated-at.bofh.it>
Organization linux.* mail to news gateway

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> > There are two ways to fix the warnings:
> >
> > 1. get rid of the thunks and call the C functions directly; or
> 
> No. Not until gcc learns about per-function callibg conventions (so that it can
> be marked as not clobbering registers).

It does already for static functions in 5.x (with -fipa-ra).
And with LTO it can be used even somewhat globally.

Even older version supported it, for only for x86->SSE on 32bit, which
is useless for the kernel. But the new IPA-RA propagates which registers
are clobbered.

That said it will probably be a long time until we can drop support for
older compilers.  So for now the manual method is still needed.

-Andi

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Re: [PATCH 00/33] Compile-time stack metadata validation Jiri Slaby <jslaby@suse.cz> - 2016-02-12 11:40 +0100
  Re: [PATCH 00/33] Compile-time stack metadata validation Jiri Slaby <jslaby@suse.cz> - 2016-02-12 11:50 +0100
  Re: [PATCH 00/33] Compile-time stack metadata validation Josh Poimboeuf <jpoimboe@redhat.com> - 2016-02-12 15:50 +0100
    Re: [PATCH 00/33] Compile-time stack metadata validation Peter Zijlstra <peterz@infradead.org> - 2016-02-12 18:20 +0100
      Re: [PATCH 00/33] Compile-time stack metadata validation Josh Poimboeuf <jpoimboe@redhat.com> - 2016-02-12 19:40 +0100
      Re: [PATCH 00/33] Compile-time stack metadata validation Josh Poimboeuf <jpoimboe@redhat.com> - 2016-02-12 19:40 +0100
        Re: [PATCH 00/33] Compile-time stack metadata validation Peter Zijlstra <peterz@infradead.org> - 2016-02-12 21:20 +0100
          Re: [PATCH 00/33] Compile-time stack metadata validation Josh Poimboeuf <jpoimboe@redhat.com> - 2016-02-15 17:40 +0100
            Re: [PATCH 00/33] Compile-time stack metadata validation Peter Zijlstra <peterz@infradead.org> - 2016-02-15 18:00 +0100
            Re: [PATCH 00/33] Compile-time stack metadata validation Andi Kleen <andi@firstfloor.org> - 2016-02-15 21:10 +0100
            Re: [PATCH 00/33] Compile-time stack metadata validation Josh Poimboeuf <jpoimboe@redhat.com> - 2016-02-15 21:10 +0100
              [PATCH] sched/x86: Add stack frame dependency to  __preempt_schedule[_notrace] Josh Poimboeuf <jpoimboe@redhat.com> - 2016-02-18 18:50 +0100
                Re: [PATCH] sched/x86: Add stack frame dependency to  __preempt_schedule[_notrace] Jiri Slaby <jslaby@suse.cz> - 2016-02-19 13:10 +0100

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