linux-kernel - Re: [PATCH 1/1] Change ping_group_range default to what Android's init script sets.

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Date:   Tue, 31 Oct 2017 10:10:30 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Rob Landley <rob@...dley.net>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        davem@...emloft.net, kuznet@....inr.ac.ru, ebiederm@...ssion.com,
        xiyou.wangcong@...il.com, yoshfuji@...ux-ipv6.org,
        segoon@...nwall.com
Subject: Re: [PATCH 1/1] Change ping_group_range default to what Android's
 init script sets.

On 10/30/2017 08:39 PM, Rob Landley wrote:
> From: Rob Landley <rob@...dley.net>
> 
> See message from the Android "native tools and libraries team" lead
> (I.E. the maintainer of bionic, adb, toolbox, etc) at
> http://lists.landley.net/pipermail/toybox-landley.net/2017-July/009103.html
> 
> Signed-off-by: Rob Landley <rob@...dley.net>
> ---
> 
>  net/ipv4/af_inet.c |    8 ++------
>  1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
> index e31108e..5b39a96 100644
> --- a/net/ipv4/af_inet.c
> +++ b/net/ipv4/af_inet.c
> @@ -1712,12 +1712,8 @@ static __net_init int inet_init_net(struct net *net)
>  	net->ipv4.ip_local_ports.range[1] =  60999;
>  
>  	seqlock_init(&net->ipv4.ping_group_range.lock);
> -	/*
> -	 * Sane defaults - nobody may create ping sockets.
> -	 * Boot scripts should set this to distro-specific group.
> -	 */
> -	net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 1);
> -	net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 0);
> +	net->ipv4.ping_group_range.range[0] = make_kgid(&init_user_ns, 0);
> +	net->ipv4.ping_group_range.range[1] = make_kgid(&init_user_ns, 2147483647);

It would help me to know that that magic number is 0x7fffffff.

>  	/* Default values for sysctl-controlled parameters.
>  	 * We set them here, in case sysctl is not compiled.
> 


-- 
~Randy