riscv: mm: Fixup compat arch_get_mmap_end

commit 97b7ac69be2e5a683e898f5267f659fde52efdd5 upstream.

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@vger.kernel.org
Fixes: add2cc6b6515 ("RISC-V: mm: Restrict address space for sv39,sv48,sv57")
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/20231222115703.2404036-3-guoren@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h
index 3e23e17..4f6af8c 100644 (file)
--- a/arch/riscv/include/asm/processor.h
+++ b/arch/riscv/include/asm/processor.h
@@ -15,7 +15,7 @@
 
 #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)                    \
 ({                                                             \