linux-kernel - Re: [PATCH V3 2/4] riscv: mm: Fixup compat arch_get_mmap

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Date: Fri, 22 Dec 2023 19:39:07 -0800
From: Charlie Jenkins <charlie@...osinc.com>
To: Leonardo Bras <leobras@...hat.com>
Cc: guoren@...nel.org, linux-kernel@...r.kernel.org,
	paul.walmsley@...ive.com, palmer@...belt.com,
	alexghiti@...osinc.com, xiao.w.wang@...el.com, david@...hat.com,
	panqinglin2020@...as.ac.cn, rick.p.edgecombe@...el.com,
	willy@...radead.org, bjorn@...osinc.com, conor.dooley@...rochip.com,
	cleger@...osinc.com, linux-riscv@...ts.infradead.org,
	Guo Ren <guoren@...ux.alibaba.com>, stable@...r.kernel.org
Subject: Re: [PATCH V3 2/4] riscv: mm: Fixup compat arch_get_mmap_end

On Fri, Dec 22, 2023 at 11:51:48PM -0300, Leonardo Bras wrote:
> On Fri, Dec 22, 2023 at 06:57:01AM -0500, guoren@...nel.org wrote:
> > 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")
> > 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
> > 
> 
> 
> LGTM. 
> 
> FWIW:
> Reviewed-by: Leonardo Bras <leobras@...hat.com>

Reviewed-by: Charlie Jenkins <charlie@...osinc.com>

>