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Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random

From Daniel Micay <danielmicay@gmail.com>
Newsgroups linux.kernel
Subject Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random
Date 2016-10-31 22:10 +0100
Message-ID <sys09-7Ib-1@gated-at.bofh.it> (permalink)
References <sylrH-3r1-9@gated-at.bofh.it> <synjQ-4H2-31@gated-at.bofh.it> <synDb-4Pf-9@gated-at.bofh.it> <syrGN-7md-15@gated-at.bofh.it> <syrQt-7pC-19@gated-at.bofh.it>
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> It makes a lot of sense on x86_64 where it means the canary is still
> 56
> bits. Also, you want -fstack-check for protecting again stack
> overflows
> rather than stack *buffer* overflow. SSP won't really help you in that
> regard. Sadly, while -fstack-check now works well in GCC 6 with little
> performance cost, it's not really a complete feature (and Clang impls
> it
> as a no-op!).

Note: talking about userspace after the entropy bit. The kernel doesn't
really -fstack-check, at least in even slightly sane code...

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Thread

[PATCH] fork: make whole stack_canary random Jann Horn <jann@thejh.net> - 2016-10-31 15:10 +0100
  Re: [PATCH] fork: make whole stack_canary random Kees Cook <keescook@chromium.org> - 2016-10-31 17:10 +0100
    Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary  random Jann Horn <jann@thejh.net> - 2016-10-31 17:30 +0100
      Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random Florian Weimer <fw@deneb.enyo.de> - 2016-10-31 21:50 +0100
        Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary  random Jann Horn <jann@thejh.net> - 2016-10-31 22:00 +0100
        Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary  random Daniel Micay <danielmicay@gmail.com> - 2016-10-31 22:00 +0100
          Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary  random Daniel Micay <danielmicay@gmail.com> - 2016-10-31 22:10 +0100
            Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random Florian Weimer <fw@deneb.enyo.de> - 2016-10-31 22:20 +0100
              Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary  random Jann Horn <jann@thejh.net> - 2016-10-31 22:30 +0100
                Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random Florian Weimer <fw@deneb.enyo.de> - 2016-10-31 22:30 +0100
                Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary  random Daniel Micay <danielmicay@gmail.com> - 2016-10-31 22:30 +0100
              Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary  random Daniel Micay <danielmicay@gmail.com> - 2016-10-31 22:30 +0100
                Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random Florian Weimer <fw@deneb.enyo.de> - 2016-10-31 22:40 +0100
                Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary  random Daniel Micay <danielmicay@gmail.com> - 2016-10-31 23:10 +0100
                Re: [kernel-hardening] Re: [PATCH] fork: make whole stack_canary random Florian Weimer <fw@deneb.enyo.de> - 2016-10-31 23:20 +0100

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