linux-kernel - [PATCH 5.16 0099/1017] riscv: Increase stack size under KASAN

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Message-Id: <20220405070357.135672401@linuxfoundation.org>
Date:   Tue,  5 Apr 2022 09:16:52 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dmitry Vyukov <dvyukov@...gle.com>,
        syzbot+0600986d88e2d4d7ebb8@...kaller.appspotmail.com,
        Palmer Dabbelt <palmer@...osinc.com>
Subject: [PATCH 5.16 0099/1017] riscv: Increase stack size under KASAN

From: Dmitry Vyukov <dvyukov@...gle.com>

commit b81d591386c3a50b96dddcf663628ea0df0bf2b3 upstream.

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

Signed-off-by: Dmitry Vyukov <dvyukov@...gle.com>
Reported-by: syzbot+0600986d88e2d4d7ebb8@...kaller.appspotmail.com
Fixes: 8ad8b72721d0 ("riscv: Add KASAN support")
Cc: stable@...r.kernel.org
Signed-off-by: Palmer Dabbelt <palmer@...osinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/riscv/include/asm/thread_info.h |   10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

--- 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)