tree fa349329484c8fa3ead4cece0dd7c25fc6e60367
parent eca3206abbf2223d6bc6c1c4337c911077fc2897
author Elliott Hughes <enh@google.com> 1450120628 -0800
committer Elliott Hughes <enh@google.com> 1450120628 -0800

Enable -fstack-protector-strong for arm.

This results in nearly all functions with the possibility of stack
corruption getting stack canaries, because it applies to any function
taking a reference to the frame or with a local array rather than just
the functions with arrays larger than 8 bytes. It was developed for use
in Chrome (and Chrome OS) and has also been adopted by various other
distributions (Arch, Fedora, Ubuntu, etc).

The code size increase ranges from ~1.5% to ~2.5%, compared to ~0.3% to
~0.7% with the more conservative switch. The increase in the performance
loss is usually minimal. The overall size increase once everything other
than C and C++ code is taken into account is minimal, and it greatly
improves the mitigation of stack buffer overflow vulnerabilities.

https://lwn.net/Articles/584225/

Change-Id: Iccc20852db8a5e4dd9792f9da6d5e325fc59b0a5