From: riel@redhat.com (riel at redhat.com)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 5/5] sh64: ascii armor the sh64 boot init stack canary
Date: Fri, 19 May 2017 17:26:36 -0400 [thread overview]
Message-ID: <20170519212636.30440-6-riel@redhat.com> (raw)
In-Reply-To: <20170519212636.30440-1-riel@redhat.com>
From: Rik van Riel <riel@redhat.com>
Use the ascii-armor canary to prevent unterminated C string overflows
from being able to successfully overwrite the canary, even if they
somehow obtain the canary value.
Inspired by execshield ascii-armor and PaX/grsecurity.
Signed-off-by: Rik van Riel <riel@redhat.com>
---
arch/sh/include/asm/stackprotector.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/sh/include/asm/stackprotector.h b/arch/sh/include/asm/stackprotector.h
index d9df3a76847c..141515a43b78 100644
--- a/arch/sh/include/asm/stackprotector.h
+++ b/arch/sh/include/asm/stackprotector.h
@@ -19,6 +19,7 @@ static __always_inline void boot_init_stack_canary(void)
/* Try to get a semi random initial value. */
get_random_bytes(&canary, sizeof(canary));
canary ^= LINUX_VERSION_CODE;
+ canary &= CANARY_MASK;
current->stack_canary = canary;
__stack_chk_guard = current->stack_canary;
--
2.9.3
next prev parent reply other threads:[~2017-05-19 21:26 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-19 21:26 stackprotector: ascii armor the stack canary riel at redhat.com
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 ` riel at redhat.com [this message]
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
-- strict thread matches above, loose matches on Subject: below --
2017-05-24 15:57 [PATCH v2 0/5] " riel at redhat.com
2017-05-24 15:57 ` [PATCH 5/5] sh64: ascii armor the sh64 boot init " riel at redhat.com
2017-05-24 16:34 ` Rik van Riel
2017-05-24 16:35 ` Kees Cook
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