Commit 7fda8d2a authored by Josh Gao's avatar Josh Gao
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Implement setjmp cookies on ARM. 

Reuse the top bits of _JB_SIGFLAG field previously used to store a
boolean to store a cookie that's validated by [sig]longjmp to make it
harder to use as a ROP gadget. Additionally, encrypt saved registers
with the cookie so that an attacker can't modify a register's value to
a specific value without knowing the cookie.

Bug: http://b/23942752
Change-Id: Id0eb8d06916e89d5d776bfcaa9458f8826717ba3
parent 90fc8e24
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