[PATCH] riscv: Increase stack size under KASAN

[Dmitry Vyukov]

KASAN requires more stack space because of compiler instrumentation.
Increase stack size as other arches do.

Signed-off-by: Dmitry Vyukov <dvyukov at google.com>
Reported-by: syzbot+0600986d88e2d4d7ebb8 at syzkaller.appspotmail.com
Cc: linux-riscv at lists.infradead.org
Cc: kasan-dev at googlegroups.com
---
 arch/riscv/include/asm/thread_info.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h
index 60da0dcacf145..74d888c8d631a 100644
--- a/arch/riscv/include/asm/thread_info.h
+++ b/arch/riscv/include/asm/thread_info.h
@@ -11,11 +11,17 @@
 #include <asm/page.h>
 #include <linux/const.h>
 
+#ifdef CONFIG_KASAN
+#define KASAN_STACK_ORDER 1
+#else
+#define KASAN_STACK_ORDER 0
+#endif
+
 /* thread information allocation */
 #ifdef CONFIG_64BIT
-#define THREAD_SIZE_ORDER	(2)
+#define THREAD_SIZE_ORDER	(2 + KASAN_STACK_ORDER)
 #else
-#define THREAD_SIZE_ORDER	(1)
+#define THREAD_SIZE_ORDER	(1 + KASAN_STACK_ORDER)
 #endif
 #define THREAD_SIZE		(PAGE_SIZE << THREAD_SIZE_ORDER)
 

base-commit: 0966d385830de3470b7131db8e86c0c5bc9c52dc
-- 
2.35.1.723.g4982287a31-goog