linux-kernel - Re: [PATCH] MIPS: Fixed __debug_virt_addr

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Message-ID: <20220711083848.GE6084@alpha.franken.de>
Date:   Mon, 11 Jul 2022 10:38:48 +0200
From:   Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     linux-mips@...r.kernel.org, gerg@...nel.org,
        fancer.lancer@...il.com, open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] MIPS: Fixed __debug_virt_addr_valid()

On Thu, Jul 07, 2022 at 02:52:36PM -0700, Florian Fainelli wrote:
> It is permissible for kernel code to call virt_to_phys() against virtual
> addresses that are in KSEG0 or KSEG1 and we need to be dealing with both
> types. Add a final condition that ensures that the virtual address is
> below KSEG2.
> 
> Fixes: dfad83cb7193 ("MIPS: Add support for CONFIG_DEBUG_VIRTUAL")
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  arch/mips/mm/physaddr.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/mips/mm/physaddr.c b/arch/mips/mm/physaddr.c
> index a1ced5e44951..a82f8f57a652 100644
> --- a/arch/mips/mm/physaddr.c
> +++ b/arch/mips/mm/physaddr.c
> @@ -5,6 +5,7 @@
>  #include <linux/mmdebug.h>
>  #include <linux/mm.h>
>  
> +#include <asm/addrspace.h>
>  #include <asm/sections.h>
>  #include <asm/io.h>
>  #include <asm/page.h>
> @@ -30,7 +31,7 @@ static inline bool __debug_virt_addr_valid(unsigned long x)
>  	if (x == MAX_DMA_ADDRESS)
>  		return true;
>  
> -	return false;
> +	return KSEGX(x) < KSEG2;
>  }
>  
>  phys_addr_t __virt_to_phys(volatile const void *x)
> -- 
> 2.25.1

applied to mips-next.

Thomas.

-- 
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea.                                                [ RFC1925, 2.3 ]