linux-kernel - [PATCH 25/26] isdn: eicon: mark divascapi incompatible with kasan

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Date:   Thu,  2 Mar 2017 17:38:33 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     kasan-dev@...glegroups.com
Cc:     Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-media@...r.kernel.org,
        linux-wireless@...r.kernel.org,
        kernel-build-reports@...ts.linaro.org,
        "David S . Miller" <davem@...emloft.net>,
        Arnd Bergmann <arnd@...db.de>
Subject: [PATCH 25/26] isdn: eicon: mark divascapi incompatible with kasan

When CONFIG_KASAN is enabled, we have several functions that use rather
large kernel stacks, e.g.

drivers/isdn/hardware/eicon/message.c: In function 'group_optimization':
drivers/isdn/hardware/eicon/message.c:14841:1: warning: the frame size of 864 bytes is larger than 500 bytes [-Wframe-larger-than=]
drivers/isdn/hardware/eicon/message.c: In function 'add_b1':
drivers/isdn/hardware/eicon/message.c:7925:1: warning: the frame size of 1008 bytes is larger than 500 bytes [-Wframe-larger-than=]
drivers/isdn/hardware/eicon/message.c: In function 'add_b23':
drivers/isdn/hardware/eicon/message.c:8551:1: warning: the frame size of 928 bytes is larger than 500 bytes [-Wframe-larger-than=]
drivers/isdn/hardware/eicon/message.c: In function 'sig_ind':
drivers/isdn/hardware/eicon/message.c:6113:1: warning: the frame size of 2112 bytes is larger than 500 bytes [-Wframe-larger-than=]

To be on the safe side, and to enable a lower frame size warning limit, let's
just mark this driver as broken when KASAN is in use. I have tried to reduce
the stack size as I did with dozens of other drivers, but failed to come up
with a good solution for this one.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/isdn/hardware/eicon/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/isdn/hardware/eicon/Kconfig b/drivers/isdn/hardware/eicon/Kconfig
index 6082b6a5ced3..b64496062421 100644
--- a/drivers/isdn/hardware/eicon/Kconfig
+++ b/drivers/isdn/hardware/eicon/Kconfig
@@ -31,6 +31,7 @@ config ISDN_DIVAS_PRIPCI
 
 config ISDN_DIVAS_DIVACAPI
 	tristate "DIVA CAPI2.0 interface support"
+	depends on !KASAN || BROKEN
 	help
 	  You need this to provide the CAPI interface
 	  for DIVA Server cards.
-- 
2.9.0