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authorChristophe Leroy <christophe.leroy@c-s.fr>2019-04-26 16:23:26 +0000
committerMichael Ellerman <mpe@ellerman.id.au>2019-05-03 01:20:25 +1000
commit26deb04342e343ac58ab05bc7d2345ff0be9b667 (patch)
tree39040b7c409757661ecd6c7d82dce9e919072625 /arch/powerpc/include/asm/kasan.h
parentd69ca6bab39e84a84781535b977c7e62c8f84d37 (diff)
powerpc: prepare string/mem functions for KASAN
CONFIG_KASAN implements wrappers for memcpy() memmove() and memset() Those wrappers are doing the verification then call respectively __memcpy() __memmove() and __memset(). The arches are therefore expected to rename their optimised functions that way. For files on which KASAN is inhibited, #defines are used to allow them to directly call optimised versions of the functions without going through the KASAN wrappers. See commit 393f203f5fd5 ("x86_64: kasan: add interceptors for memset/memmove/memcpy functions") for details. Other string / mem functions do not (yet) have kasan wrappers, we therefore have to fallback to the generic versions when KASAN is active, otherwise KASAN checks will be skipped. Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> [mpe: Fixups to keep selftests working] Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/kasan.h')
-rw-r--r--arch/powerpc/include/asm/kasan.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/kasan.h b/arch/powerpc/include/asm/kasan.h
new file mode 100644
index 000000000000..2c179a39d4ba
--- /dev/null
+++ b/arch/powerpc/include/asm/kasan.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __ASM_KASAN_H
+#define __ASM_KASAN_H
+
+#ifdef CONFIG_KASAN
+#define _GLOBAL_KASAN(fn) _GLOBAL(__##fn)
+#define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(__##fn)
+#define EXPORT_SYMBOL_KASAN(fn) EXPORT_SYMBOL(__##fn)
+#else
+#define _GLOBAL_KASAN(fn) _GLOBAL(fn)
+#define _GLOBAL_TOC_KASAN(fn) _GLOBAL_TOC(fn)
+#define EXPORT_SYMBOL_KASAN(fn)
+#endif
+
+#endif