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From: "matheus.a.m.moreira at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug middle-end/113694] New: Allow renaming stack smashing protector
 symbols
Date: Wed, 31 Jan 2024 22:58:14 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: middle-end
X-Bugzilla-Version: 14.0
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X-Bugzilla-Who: matheus.a.m.moreira at gmail dot com
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113694

            Bug ID: 113694
           Summary: Allow renaming stack smashing protector symbols
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
          Assignee: unassigned at gcc dot gnu.org
          Reporter: matheus.a.m.moreira at gmail dot com
  Target Milestone: ---

I'm writing freestanding Linux applications which are compiled with
-ffreestanding -nostdlib. In order to integrate with the stack smashing
protector, I need to provide the following symbols:

    __stack_chk_guard
    __stack_chk_fail

It would be nice if there was a compiler option to rename these symbols to
something else. I want to make them consistent with the rest of my code,
thereby improving its quality.

A couple of options would be enough:

    -fstack-protector-canary=3Dmy_variable
    -fstack-protector-handler=3Dmy_function

Attributes could work too:

    uintptr_t my_canary __attribute__((stack_protector_canary));

    __attribute__((noreturn, stack_protector_handler))
    void __stack_chk_fail(void);=