From: riel@redhat.com (riel at redhat.com)
To: linux-arm-kernel@lists.infradead.org
Subject: stackprotector: ascii armor the stack canary
Date: Fri, 19 May 2017 17:26:31 -0400 [thread overview]
Message-ID: <20170519212636.30440-1-riel@redhat.com> (raw)
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/
next reply other threads:[~2017-05-19 21:26 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-19 21:26 riel at redhat.com [this message]
2017-05-19 21:26 ` [PATCH 1/5] random, stackprotect: introduce get_random_canary function riel at redhat.com
2017-05-24 8:30 ` [PATCH 1/5] random,stackprotect: " Ingo Molnar
2017-05-19 21:26 ` [PATCH 2/5] fork, random: use get_random_canary to set tsk->stack_canary riel at redhat.com
2017-05-19 21:26 ` [PATCH 3/5] x86: ascii armor the x86_64 boot init stack canary riel at redhat.com
2017-05-19 21:26 ` [PATCH 4/5] arm64: ascii armor the arm64 " riel at redhat.com
2017-05-19 21:26 ` [PATCH 5/5] sh64: ascii armor the sh64 " riel at redhat.com
2017-05-19 21:32 ` stackprotector: ascii armor the " Kees Cook
2017-05-24 11:57 ` Geert Uytterhoeven
2017-05-19 23:57 ` Daniel Micay
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