linux-kernel - Re: [PATCH] x86/mm: Fix personality(ADDR_NO

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Message-ID: <20170814161347.GO2005@uranus.lan>
Date:   Mon, 14 Aug 2017 19:13:47 +0300
From:   Cyrill Gorcunov <gorcunov@...il.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Dmitry Safonov <dsafonov@...tuozzo.com>,
        Borislav Petkov <bp@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, stable <stable@...r.kernel.org>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCH] x86/mm: Fix personality(ADDR_NO_RANDOMIZE)

On Mon, Aug 14, 2017 at 06:57:19PM +0300, Kirill A. Shutemov wrote:
> In v4.12, during rework of infrastructure around mmap_base, disable-ASLR
> personality flag got accidentally broken.
> 
> Let's make it work again.
> 
> Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> Fixes: 1b028f784e8c ("x86/mm: Introduce mmap_compat_base() for 32-bit mmap()")
> Cc: stable <stable@...r.kernel.org> [4.12+]
> ---
>  arch/x86/mm/mmap.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
> index 229d04a83f85..779bdbe5e424 100644
> --- a/arch/x86/mm/mmap.c
> +++ b/arch/x86/mm/mmap.c
> @@ -127,6 +127,8 @@ static unsigned long mmap_legacy_base(unsigned long rnd,
>  static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base,
>  		unsigned long random_factor, unsigned long task_size)
>  {
> +	if (!(current->flags & PF_RANDOMIZE))
> +		random_factor = 0;
>  	*legacy_base = mmap_legacy_base(random_factor, task_size);
>  	if (mmap_is_legacy())
>  		*base = *legacy_base;

Didn't Oleg's patch does the same?

https://patchwork.kernel.org/patch/9832697/

for some reason it's not yet merged.