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From: Arnd Bergmann <arnd@arndb.de>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: kasan-dev@googlegroups.com, Dmitry Vyukov <dvyukov@google.com>,
	Alexander Potapenko <glider@google.com>,
	Andrey Ryabinin <aryabinin@virtuozzo.com>,
	netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	Arend van Spriel <arend.vanspriel@broadcom.com>,
	Arnd Bergmann <arnd@arndb.de>
Subject: [PATCH v2 01/11] compiler: introduce noinline_if_stackbloat annotation
Date: Wed, 14 Jun 2017 23:15:36 +0200	[thread overview]
Message-ID: <20170614211556.2062728-2-arnd@arndb.de> (raw)
In-Reply-To: <20170614211556.2062728-1-arnd@arndb.de>

When CONFIG_KASAN is set, we can run into some code that uses incredible
amounts of kernel stack:

drivers/staging/dgnc/dgnc_neo.c:1056:1: error: the frame size of 11112 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
drivers/media/i2c/cx25840/cx25840-core.c:4960:1: error: the frame size of 94000 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
drivers/media/dvb-frontends/stv090x.c:3430:1: error: the frame size of 5312 bytes is larger than 3072 bytes [-Werror=frame-larger-than=]

This happens when a sanitizer uses stack memory each time an inline function
gets called. This introduces a new annotation for those functions to make
them either 'inline' or 'noinline' depending on the CONFIG_KASAN symbol.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
 include/linux/compiler.h | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 219f82f3ec1a..a402c43c07d2 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -412,6 +412,17 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
  */
 #define noinline_for_stack noinline
 
+/*
+ * CONFIG_KASAN can lead to extreme stack usage with certain patterns when
+ * one function gets inlined many times and each instance requires a stack
+ * ckeck.
+ */
+#ifdef CONFIG_KASAN
+#define noinline_if_stackbloat noinline __maybe_unused
+#else
+#define noinline_if_stackbloat inline
+#endif
+
 #ifndef __always_inline
 #define __always_inline inline
 #endif
-- 
2.9.0

  reply	other threads:[~2017-06-14 21:17 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-06-14 21:15 [PATCH v2 00/11] bring back stack frame warning with KASAN Arnd Bergmann
2017-06-14 21:15 ` Arnd Bergmann [this message]
2017-06-14 21:15 ` [PATCH v2 02/11] netlink: mark nla_put_{u8,u16,u32} noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 03/11] tty: kbd: reduce stack size with KASAN Arnd Bergmann
2017-06-14 21:28   ` Samuel Thibault
2017-06-14 21:56     ` Arnd Bergmann
2017-06-14 22:16       ` Samuel Thibault
2017-06-15  4:52   ` Greg Kroah-Hartman
2017-06-15  4:53     ` Greg Kroah-Hartman
2017-06-16 12:01       ` Arnd Bergmann
2017-06-16 13:02         ` Greg Kroah-Hartman
2017-06-16 15:41           ` Arnd Bergmann
2017-06-16 15:58             ` Samuel Thibault
2017-06-16 17:29               ` Dmitry Torokhov
2017-06-16 20:56                 ` Arnd Bergmann
2017-06-16 21:07                   ` Dmitry Torokhov
2017-06-16 17:14             ` Andrey Ryabinin
2017-06-14 21:15 ` [PATCH v2 04/11] rocker: mark rocker_tlv_put_* functions as noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 05/11] mtd: cfi: reduce stack size with KASAN Arnd Bergmann
2017-06-14 21:15   ` Arnd Bergmann
2017-08-04  7:42   ` Boris Brezillon
2017-08-04  9:09     ` Arnd Bergmann
2017-08-04 10:56       ` Boris Brezillon
2017-08-04 10:57   ` Boris Brezillon
2017-06-14 21:15 ` [PATCH v2 06/11] dvb-frontends: reduce stack size in i2c access Arnd Bergmann
2017-06-24 19:49   ` Mauro Carvalho Chehab
2017-06-14 21:15 ` [PATCH v2 07/11] r820t: mark register functions as noinline_if_stackbloat Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 08/11] brcmsmac: make some local variables 'static const' to reduce stack size Arnd Bergmann
2017-06-15 14:56   ` Kalle Valo
2017-06-14 21:15 ` [PATCH v2 09/11] brcmsmac: split up wlc_phy_workarounds_nphy Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 10/11] brcmsmac: reindent split functions Arnd Bergmann
2017-06-14 21:15 ` [PATCH v2 11/11] kasan: rework Kconfig settings Arnd Bergmann
2017-06-15  7:02   ` Dmitry Vyukov
2017-06-16 11:42     ` Arnd Bergmann
2017-06-16 11:44       ` Dmitry Vyukov

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