linux-kernel - [PATCH v5 02/12] kasan: Add support for upcoming GCC 5.0 asan ABI changes

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Date:	Mon, 27 Oct 2014 19:46:49 +0300
From:	Andrey Ryabinin <a.ryabinin@...sung.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andrey Ryabinin <a.ryabinin@...sung.com>,
	Dmitry Vyukov <dvyukov@...gle.com>,
	Konstantin Serebryany <kcc@...gle.com>,
	Dmitry Chernenkov <dmitryc@...gle.com>,
	Andrey Konovalov <adech.fo@...il.com>,
	Yuri Gribov <tetra2005@...il.com>,
	Konstantin Khlebnikov <koct9i@...il.com>,
	Sasha Levin <sasha.levin@...cle.com>,
	Christoph Lameter <cl@...ux.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Dave Hansen <dave.hansen@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Vegard Nossum <vegard.nossum@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Dave Jones <davej@...hat.com>,
	x86@...nel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: [PATCH v5 02/12] kasan: Add support for upcoming GCC 5.0 asan ABI
 changes

GCC 5.0 will have some changes in asan ABI.
New function (__asan_load*_noabort()/__asan_store*_noabort)
will be introduced.
By default, for -fsanitize=kernel-address GCC 5.0 will
generate __asan_load*_noabort() functions instead of __asan_load*()

Details in this thread: https://gcc.gnu.org/ml/gcc-patches/2014-10/msg02510.html

We still need __asan_load*() for GCC 4.9.2, so this patch just adds aliases.

Note: Patch for GCC hasn't been upstreamed yet.
I'm adding this patch in advance, to avoid breaking KASan
in future GCC update.

Signed-off-by: Andrey Ryabinin <a.ryabinin@...sung.com>
---
 mm/kasan/kasan.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c
index 8ce738e..11fa3f8 100644
--- a/mm/kasan/kasan.c
+++ b/mm/kasan/kasan.c
@@ -334,3 +334,41 @@ EXPORT_SYMBOL(__asan_storeN);
 /* to shut up compiler complaints */
 void __asan_handle_no_return(void) {}
 EXPORT_SYMBOL(__asan_handle_no_return);
+
+
+/* GCC 5.0 has different function names by default */
+void __asan_load1_noabort(unsigned long) __attribute__((alias("__asan_load1")));
+EXPORT_SYMBOL(__asan_load1_noabort);
+
+void __asan_load2_noabort(unsigned long) __attribute__((alias("__asan_load2")));
+EXPORT_SYMBOL(__asan_load2_noabort);
+
+void __asan_load4_noabort(unsigned long) __attribute__((alias("__asan_load4")));
+EXPORT_SYMBOL(__asan_load4_noabort);
+
+void __asan_load8_noabort(unsigned long) __attribute__((alias("__asan_load8")));
+EXPORT_SYMBOL(__asan_load8_noabort);
+
+void __asan_load16_noabort(unsigned long) __attribute__((alias("__asan_load16")));
+EXPORT_SYMBOL(__asan_load16_noabort);
+
+void __asan_loadN_noabort(unsigned long) __attribute__((alias("__asan_loadN")));
+EXPORT_SYMBOL(__asan_loadN_noabort);
+
+void __asan_store1_noabort(unsigned long) __attribute__((alias("__asan_store1")));
+EXPORT_SYMBOL(__asan_store1_noabort);
+
+void __asan_store2_noabort(unsigned long) __attribute__((alias("__asan_store2")));
+EXPORT_SYMBOL(__asan_store2_noabort);
+
+void __asan_store4_noabort(unsigned long) __attribute__((alias("__asan_store4")));
+EXPORT_SYMBOL(__asan_store4_noabort);
+
+void __asan_store8_noabort(unsigned long) __attribute__((alias("__asan_store8")));
+EXPORT_SYMBOL(__asan_store8_noabort);
+
+void __asan_store16_noabort(unsigned long) __attribute__((alias("__asan_store16")));
+EXPORT_SYMBOL(__asan_store16_noabort);
+
+void __asan_storeN_noabort(unsigned long) __attribute__((alias("__asan_storeN")));
+EXPORT_SYMBOL(__asan_storeN_noabort);
-- 
2.1.2

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