linux-kernel - [PATCH] latent_entropy: raise CONFIG_FRAME

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Message-ID: <20161018211216.GA39687@beast>
Date:   Tue, 18 Oct 2016 14:12:16 -0700
From:   Kees Cook <keescook@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>, Michal Marek <mmarek@...e.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Tejun Heo <tj@...nel.org>,
        Nikolay Aleksandrov <nikolay@...ulusnetworks.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Shuah Khan <shuah@...nel.org>,
        kbuild test robot <fengguang.wu@...el.com>,
        Emese Revfy <re.emese@...il.com>
Subject: [PATCH] latent_entropy: raise CONFIG_FRAME_WARN by default

When building with the latent_entropy plugin, set the default
CONFIG_FRAME_WARN to 2048, since some __init functions have many basic
blocks that, when instrumented by the latent_entropy plugin, grow beyond
1024 byte stack size on 32-bit builds.

Reported-by: kbuild test robot <fengguang.wu@...el.com>
Cc: Emese Revfy <re.emese@...il.com>
Signed-off-by: Kees Cook <keescook@...omium.org>
---
 lib/Kconfig.debug | 1 +
 1 file changed, 1 insertion(+)

diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 33bc56cf60d7..b01e547d4d04 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -198,6 +198,7 @@ config FRAME_WARN
 	int "Warn for stack frames larger than (needs gcc 4.4)"
 	range 0 8192
 	default 0 if KASAN
+	default 2048 if GCC_PLUGIN_LATENT_ENTROPY
 	default 1024 if !64BIT
 	default 2048 if 64BIT
 	help
-- 
2.7.4


-- 
Kees Cook
Nexus Security