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Re: %gs:0x14

From: Samuel Thibault
Subject: Re: %gs:0x14
Date: Tue, 14 Nov 2006 16:26:26 +0100
User-agent: Mutt/1.5.11

Thomas Schwinge, le Tue 14 Nov 2006 16:15:08 +0100, a écrit :
> Using `-fstack-protector' with GCC 4.1 made it include assembler code
> using ``%gs:0x14'' even with `-ffreestanding'.  However, this isn't the
> correct thing to do in kernel
> space (with `-ffreestanding').  I think I've now tracked where this is
> coming from.  This is not an issue anymore with GCC 4.2 or a GCC 4.1 that
> is recent enough,

You mean that gcc now correctly switches to using __stack_chk_guard in
freestanding mode?

> But then, if this was `*-*-*gnu*' instead of `*-*-linux*' in the above
> configure check, I guess that the smashing stack protector wouldn't work
> (and would instead make all compiled programs crash) in user space on
> GNU/Hurd then, as then not `[GCC]/gcc/libgcc/''s generic code would be
> used, but instead the Linux-tls-specific macros.

Well, we'll have to fix GNU/Hurd's TLS someday anyway.


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