Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault

From	Linus Torvalds <torvalds@linux-foundation.org>
Newsgroups	linux.kernel
Subject	Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault
Date	2016-08-23 01:50 +0200
Message-ID	<s978B-4yf-3@gated-at.bofh.it> (permalink)
References	(7 earlier) <s8t1w-4d5-1@gated-at.bofh.it> <s8uJX-5jE-7@gated-at.bofh.it> <s8Fcl-3qf-11@gated-at.bofh.it> <s95Tb-3OC-15@gated-at.bofh.it> <s96Fz-4mL-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Mon, Aug 22, 2016 at 4:12 PM, H. Peter Anvin <hpa@zytor.com> wrote:
>
> How about the gcc native __builtin_setjmp stuff which is supposedly better?

How new is it? The whole point was that we'd not have to worry and
wait for gcc features..

glibc doesn't use it, which worries me a bit. Has it ever gotten any
use/testing?

But yes, the compiler could do better. If we can rely on it, and it
doesn't do stupid things (like have signal state etc crap - glibc
seems to just alias "setjmp" to "sigsetjmp" with a "didn't save
signals" flag)

             Linus

Thread

[PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-08-19 21:20 +0200
  Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-19 23:30 +0200
    Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-20 00:10 +0200
      Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-20 00:20 +0200
        Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-21 01:40 +0200
          Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-21 02:20 +0200
            Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-21 02:50 +0200
              Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-21 03:10 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-21 03:10 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-21 03:50 +0200
              Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Jakub Jelinek <jakub@redhat.com> - 2016-08-21 07:00 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-21 08:50 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-21 20:00 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-23 00:30 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-23 01:20 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Linus Torvalds <torvalds@linux-foundation.org> - 2016-08-23 01:50 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of  fault David Miller <davem@davemloft.net> - 2016-08-23 02:00 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-23 02:10 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-23 02:00 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault Al Viro <viro@ZenIV.linux.org.uk> - 2016-08-23 02:20 +0200
                Re: [PATCH] ARC: uaccess: get_user to zero out dest in cause of fault "H. Peter Anvin" <hpa@zytor.com> - 2016-08-23 01:20 +0200

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