[gentoo-dev] [RFC] News item: GCC 4.8.3 defaults to -fstack-protector

[Ryan Hill]

Title: GCC 4.8.3 defaults to -fstack-protector
Author: Ryan Hill <rhill@g.o>
Content-Type: text/plain
Posted: 2014-06-10
Revision: 1
News-Item-Format: 1.0
Display-If-Installed: >=sys-devel/gcc-4.8.3

Beginning with GCC 4.8.3, Stack Smashing Protection (SSP) will be
enabled by default.  The 4.8 series will enable -fstack-protector
while 4.9 and later enable -fstack-protector-strong.

SSP is a security feature that attempts to mitigate stack-based buffer
overflows by placing a canary value on the stack after the function
return pointer and checking for that value before the function returns.
If a buffer overflow occurs and the canary value is overwritten, the
program aborts.

There is a small performance cost to these features.  They can be
disabled with -fno-stack-protector.

For more information these options, refer to the GCC Manual, or the
following articles.

http://en.wikipedia.org/wiki/Buffer_overflow_protection
http://en.wikipedia.org/wiki/Stack_buffer_overflow
https://securityblog.redhat.com/tag/stack-protector
http://www.outflux.net/blog/archives/2014/01/27/fstack-protector-strong


-- 
Ryan Hill                        psn: dirtyepic_sk
   gcc-porting/toolchain/wxwidgets @ gentoo.org

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