Date: Thu, 6 Nov 2014 14:47:41 +0200 From: Timo Teras <timo.teras@....fi> To: John Spencer <maillist-musl@...fooze.de> Cc: musl@...ts.openwall.com, Gregor Richards <gr@...due.edu> Subject: Re: fixing -fPIE + -fstack-protector-all On Thu, 06 Nov 2014 13:40:43 +0100 John Spencer <maillist-musl@...fooze.de> wrote: > Timo Teras wrote: > > On Wed, 05 Nov 2014 16:25:03 +0100 > > John Spencer <maillist-musl@...fooze.de> wrote: > > > >> using -fPIE + -fstack-protector-all is currently broken for a > >> number of architectures (most notably i386) in the default gcc > >> setup (including the musl-cross patches), as it depends on a > >> libssp_nonshared.a which provides __stack_chk_fail_local(). > > > > In Alpine Linux we are patching gcc to unconditionally to have > > -lssp_nonshared: > > http://git.alpinelinux.org/cgit/aports/tree/main/gcc/gcc-4.8-musl-libssp.patch > > > > And making musl package provide that library: > > http://git.alpinelinux.org/cgit/aports/tree/main/musl/__stack_chk_fail_local.c > > http://git.alpinelinux.org/cgit/aports/tree/main/musl/APKBUILD#n60 > > > > yeah, i originally looked at what alpine does but then noticed that > gcc builds its own libssp_nonshared.a anyway. > btw: the gcc one is, unlike alpine's, built with hidden visibility > (from ssp-local.c): We do set the hidden visibility attribute. If it's not working then something is wrong somewhere. And yes, gcc is eager to build it's own libssp. You need to --disable-libssp for the above to work. We do it at: http://git.alpinelinux.org/cgit/aports/tree/main/gcc/APKBUILD#n273 /Timo
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