linux-kernel - [PATCH V4 2/4] riscv: mm: Fixup compat arch_get_mmap

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Date: Sun,  7 Jan 2024 01:30:23 -0500
From: guoren@...nel.org
To: paul.walmsley@...ive.com,
	palmer@...belt.com,
	alexghiti@...osinc.com,
	charlie@...osinc.com,
	guoren@...nel.org,
	panqinglin2020@...as.ac.cn,
	bjorn@...osinc.com,
	conor.dooley@...rochip.com,
	leobras@...hat.com,
	cleger@...osinc.com,
	willy@...radead.org
Cc: linux-kernel@...r.kernel.org,
	Guo Ren <guoren@...ux.alibaba.com>,
	stable@...r.kernel.org
Subject: [PATCH V4 2/4] riscv: mm: Fixup compat arch_get_mmap_end

From: Guo Ren <guoren@...ux.alibaba.com>

When the task is in COMPAT mode, the arch_get_mmap_end should be 2GB,
not TASK_SIZE_64. The TASK_SIZE has contained is_compat_mode()
detection, so change the definition of STACK_TOP_MAX to TASK_SIZE
directly.

Cc: stable@...r.kernel.org
Fixes: add2cc6b6515 ("RISC-V: mm: Restrict address space for sv39,sv48,sv57")
Reviewed-by: Leonardo Bras <leobras@...hat.com>
Reviewed-by: Charlie Jenkins <charlie@...osinc.com>
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Signed-off-by: Guo Ren <guoren@...nel.org>
---
 arch/riscv/include/asm/processor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index f19f861cda54..e1944ff0757a 100644
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -16,7 +16,7 @@
 
 #ifdef CONFIG_64BIT
 #define DEFAULT_MAP_WINDOW	(UL(1) << (MMAP_VA_BITS - 1))
-#define STACK_TOP_MAX		TASK_SIZE_64
+#define STACK_TOP_MAX		TASK_SIZE
 
 #define arch_get_mmap_end(addr, len, flags)			\
 ({								\
-- 
2.40.1