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Re: [PATCH 09/14 v6] Add stack_chk_fail_local to libc.so.

From: Florian Weimer <fweimer at redhat dot com>
To: Nix <nix at esperi dot org dot uk>, libc-alpha at sourceware dot org
Cc: Nick Alcock <nick dot alcock at oracle dot com>
Date: Fri, 24 Jun 2016 16:39:17 +0200
Subject: Re: [PATCH 09/14 v6] Add stack_chk_fail_local to libc.so.
Authentication-results: sourceware.org; auth=none
References: <1465297576-10981-1-git-send-email-nix at esperi dot org dot uk> <1465297576-10981-10-git-send-email-nix at esperi dot org dot uk>

On 06/07/2016 01:06 PM, Nix wrote:

This is required by the next commit, which routes all
__stack_chk_fail() calls in libc.so via this function to avoid
the PLT.  It has be duplicated in libc.so and libc_nonshared.a
because its entire reason for existence is to be hidden and avoid
the PLT, so the copy in libc.so is not visible from elsewhere.

Why can't this use the regular libc_hidden_proto/libc_hidden_defmechanism? The proto part is taken care of by the next patch, I getthat, but why doesn't this follow the usual __GI_ pattern?


Thanks,
Florian

References:
- --enable-stack-protector for glibc, v7
  - From: Nix
- [PATCH 09/14 v6] Add stack_chk_fail_local to libc.so.
  - From: Nix

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