* [gentoo-dev] Re: [PATCH] To enable ssp default in Gcc the toolchain.eclass need some changes.
@ 2014-01-10 21:56 99% ` Ryan Hill
0 siblings, 0 replies; 1+ results
From: Ryan Hill @ 2014-01-10 21:56 UTC (permalink / raw
To: gentoo-dev
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On Fri, 10 Jan 2014 15:08:02 -0500
"Anthony G. Basile" <basile@opensource.dyc.edu> wrote:
> On 01/10/2014 10:50 AM, Ryan Hill wrote:
> > Having slept on it I'm starting to agree. My first argument was that on
> > hardened ssp is -fstack-protector-all, which is much more expensive, and it
> > adds -fstack-check and -z,now to the linker by default as well. The pie
> > half
>
> I'm pretty sure we're not adding -fstack-check unless something has
> changed. Where are you seeing that?
>
> The reason I'm concerned is because of situations like bug #471756.
> stack-check incumbers a register which in some situations (like the asm
> in ffmpeg) can get you into trouble with not enough GENERAL_REGS.
40_all_gcc48_config_esp.patch:
54 + #if defined ( EFAULT_SSP ) || defined ( EFAULT_PIE_SSP )
55 + #define ESP_OPTIONS_SSP_SPEC \
56 + "%{nostdlib|nodefaultlibs|ffreestanding|fno-stack-protector| \
57 + fstack-protector|fstack-protector-all:;:-fstack-protector-all} \
58 + %{fstack-check|fstack-check=*:;: -fstack-check}"
> > It might be useful to have these flags so we can mask them on archs that
> > don't support ssp/pie. But that's always been true and it looks like sh is
> > the only place we've bothered for some reason.
>
> Yes please. I had this issue on mips where gcc didn't support ssp for
> early versions of gcc 4.x.
There's a list of arches in every gcc ebuild that support PIE and SSP for
both glibc and uclibc. AFAICT you would just have to remove mips from that
list.
--
Ryan Hill psn: dirtyepic_sk
gcc-porting/toolchain/wxwidgets @ gentoo.org
47C3 6D62 4864 0E49 8E9E 7F92 ED38 BD49 957A 8463
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2014-01-09 20:58 [gentoo-dev] [PATCH] To enable ssp default in Gcc the toolchain.eclass need some changes Magnus Granberg
2014-01-09 21:11 ` Rick "Zero_Chaos" Farina
2014-01-09 23:26 ` [gentoo-dev] " Ryan Hill
2014-01-09 23:30 ` Andreas K. Huettel
2014-01-09 23:41 ` William Hubbs
2014-01-10 0:12 ` Ryan Hill
2014-01-10 6:35 ` Rick "Zero_Chaos" Farina
2014-01-10 15:50 ` Ryan Hill
2014-01-10 20:08 ` Anthony G. Basile
2014-01-10 21:56 99% ` Ryan Hill
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