linux-kernel - Re: [PATCH] elf: don't hash userspace addresses

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Date:   Sat, 5 May 2018 09:31:50 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     adobriyan@...il.com, akpm@...ux-foundation.org
Cc:     linux-kernel@...r.kernel.org, mhocko@...e.com
Subject: Re: [PATCH] elf: don't hash userspace addresses

Alexey Dobriyan wrote:
> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
> ---
> 
>  fs/binfmt_elf.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> --- a/fs/binfmt_elf.c
> +++ b/fs/binfmt_elf.c
> @@ -379,8 +379,8 @@ static unsigned long elf_map(struct file *filep, unsigned long addr,
>  
>  	if ((type & MAP_FIXED_NOREPLACE) &&
>  	    PTR_ERR((void *)map_addr) == -EEXIST)
> -		pr_info("%d (%s): Uhuuh, elf segment at %px requested but the memory is mapped already\n",
> -			task_pid_nr(current), current->comm, (void *)addr);
> +		pr_info("%d (%s): Uhuuh, elf segment at %lx requested but the memory is mapped already\n",
> +			task_pid_nr(current), current->comm, addr);

"%px" does not hash. For what reason you replace %px with %lx ?

>  
>  	return(map_addr);
>  }
>