linux-kernel - RE: [PATCH linux] net/ipv4: ping_group_range: allow GID from 2147483648 to 4294967294

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Date:   Fri, 2 Jun 2023 10:51:50 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Kuniyuki Iwashima' <kuniyu@...zon.com>,
        "edumazet@...gle.com" <edumazet@...gle.com>
CC:     "akihiro.suda.cz@....ntt.co.jp" <akihiro.suda.cz@....ntt.co.jp>,
        "akihirosuda@....sr.ht" <akihirosuda@....sr.ht>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kuba@...nel.org" <kuba@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "segoon@...nwall.com" <segoon@...nwall.com>,
        "suda.kyoto@...il.com" <suda.kyoto@...il.com>
Subject: RE: [PATCH linux] net/ipv4: ping_group_range: allow GID from
 2147483648 to 4294967294

From: Kuniyuki Iwashima
> Sent: 01 June 2023 00:00
....
> > > --- a/include/net/ping.h
> > > +++ b/include/net/ping.h
> > > @@ -20,7 +20,7 @@
> > >   * gid_t is either uint or ushort.  We want to pass it to
> > >   * proc_dointvec_minmax(), so it must not be larger than MAX_INT
> > >   */
> > > -#define GID_T_MAX (((gid_t)~0U) >> 1)
> > > +#define GID_T_MAX ((gid_t)~0U)

Doesn't that comment need updating?

I do wonder how much code breaks for gid > MAXINT.
How much testing does it actually get??

	David

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