Messages in this thread | | | From | riel@redhat ... | Subject | stackprotector: ascii armor the stack canary | Date | Fri, 19 May 2017 17:26:31 -0400 |
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Zero out the first byte of the stack canary value on 64 bit systems, in order to prevent unterminated C string overflows from being able to successfully overwrite the canary, even if an attacker somehow guessed or obtained the canary value.
Inspired by execshield ascii-armor and PaX/grsecurity.
Thanks to Daniel Micay for extracting code of similar functionality from PaX/grsecurity and making it easy to find in his linux-hardened git tree on https://github.com/thestinger/linux-hardened/
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