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How to enable GCC for gentoo -fstack-clash-protection to fix
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gentoo-find
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PostPosted: Sat Jan 12, 2019 5:39 am    Post subject: How to enable GCC for gentoo -fstack-clash-protection to fix Reply with quote

https://www.openwall.com/lists/oss-security/2019/01/09/3

How to enable GCC for gentoo -fstack-clash-protection to fix systemd cve
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Ant P.
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PostPosted: Sat Jan 12, 2019 6:44 am    Post subject: Reply with quote

Add it to your *FLAGS vars in make.conf and emerge -e @world.
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gentoo-find
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PostPosted: Sat Jan 12, 2019 10:22 am    Post subject: Reply with quote

Ant P. wrote:
Add it to your *FLAGS vars in make.conf and emerge -e @world.


COMMON_FLAGS="-fstack-clash-protection" ?
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fedeliallalinea
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PostPosted: Sat Jan 12, 2019 10:26 am    Post subject: Reply with quote

gentoo-find wrote:
Ant P. wrote:
Add it to your *FLAGS vars in make.conf and emerge -e @world.


COMMON_FLAGS="-fstack-clash-protection" ?

I think Ant P. means
Code:
CFLAGS="<your current cflags> -fstack-clash-protection"
CXXFLAGS="${CFLAGS}"

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Hu
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PostPosted: Sat Jan 12, 2019 5:02 pm    Post subject: Reply with quote

Also, be sure you use a gcc that understands that option. It appears to be new in 8.x. If you use it in an older version, gcc will reject it and the build will fail.
Code:
$ gcc-7.3.0 -x c -o /dev/null /dev/null -c -fstack-clash-protection
gcc-7.3.0: error: unrecognized command line option '-fstack-clash-protection'; did you mean '-fstack-protector'?
$ gcc-8.2.0 -x c -o /dev/null /dev/null -c -fstack-clash-protection
$
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fedeliallalinea
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PostPosted: Sat Jan 12, 2019 9:11 pm    Post subject: Reply with quote

Hu wrote:
Also, be sure you use a gcc that understands that option. It appears to be new in 8.x. If you use it in an older version, gcc will reject it and the build will fail.]

Thanks for the tips Hu, I missed this one.
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kurly
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PostPosted: Sat Jan 12, 2019 9:44 pm    Post subject: Reply with quote

fedeliallalinea wrote:
Hu wrote:
Also, be sure you use a gcc that understands that option. It appears to be new in 8.x. If you use it in an older version, gcc will reject it and the build will fail.]

Thanks for the tips Hu, I missed this one.

Should be on already?
Code:
kurly@smile ~ $ LANG=C gcc-8.2.0 -Q --help=common | fgrep stack-clash
  -fstack-clash-protection          [enabled]
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Tom_
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PostPosted: Fri Feb 08, 2019 4:23 pm    Post subject: Reply with quote

I wonder if any of you has already enabled this flag globally. Does this flag cause compilation issue ?
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Ant P.
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PostPosted: Fri Feb 08, 2019 6:49 pm    Post subject: Reply with quote

Tom_ wrote:
I wonder if any of you has already enabled this flag globally. Does this flag cause compilation issue ?

Evidently not, if you'd read the post directly above yours you'll see we already all have it enabled.
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Tom_
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PostPosted: Fri Feb 08, 2019 7:13 pm    Post subject: Reply with quote

Of course I read the post above but I didn't understand it at first. I thought that this command showed gcc capabilities (to show that gcc-8 was required for this flag) but not actual compiler flags. Sorry
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Moonboots
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PostPosted: Tue Feb 12, 2019 11:27 am    Post subject: Reply with quote

https://bugs.gentoo.org/675050
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