linux-kernel - Re: [PATCH 2/3, v3] kernel: Move groups_sort to the caller of set

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Date:   Mon, 4 Dec 2017 17:14:17 -0200 (-02)
From:   Thiago Rafael Becker <thiago.becker@...il.com>
To:     Thiago Rafael Becker <thiago.becker@...il.com>
cc:     bfields@...ldses.org, neilb@...e.com, linux-nfs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3, v3] kernel: Move groups_sort to the caller of
 set_groups.

Disregard this. git reset --hard without a git stash. Sorry about it.

On Mon, 4 Dec 2017, Thiago Rafael Becker wrote:

> The responsibility for calling groups_sort is now on the caller
> of set_groups.
>
> Signed-off-by: Thiago Rafael Becker <thiago.becker@...il.com>
> ---
> kernel/groups.c           | 1 +
> kernel/uid16.c            | 1 +
> net/sunrpc/svcauth_unix.c | 7 +++++++
> 3 files changed, 9 insertions(+)
>
> diff --git a/kernel/groups.c b/kernel/groups.c
> index 4c9c9ed..17073a9 100644
> --- a/kernel/groups.c
> +++ b/kernel/groups.c
> @@ -208,6 +208,7 @@ SYSCALL_DEFINE2(setgroups, int, gidsetsize, gid_t __user *, grouplist)
> 		return retval;
> 	}
>
> +	groups_sort(group_info);
> 	retval = set_current_groups(group_info);
> 	put_group_info(group_info);
>
> diff --git a/kernel/uid16.c b/kernel/uid16.c
> index ce74a49..ef1da2a 100644
> --- a/kernel/uid16.c
> +++ b/kernel/uid16.c
> @@ -192,6 +192,7 @@ SYSCALL_DEFINE2(setgroups16, int, gidsetsize, old_gid_t __user *, grouplist)
> 		return retval;
> 	}
>
> +	groups_sort(group_info);
> 	retval = set_current_groups(group_info);
> 	put_group_info(group_info);
>
> diff --git a/net/sunrpc/svcauth_unix.c b/net/sunrpc/svcauth_unix.c
> index 740b67d..94e2ac0 100644
> --- a/net/sunrpc/svcauth_unix.c
> +++ b/net/sunrpc/svcauth_unix.c
> @@ -20,6 +20,7 @@
>
>
> #include "netns.h"
> +void groups_sort(struct group_info *group_info);
>
> /*
>  * AUTHUNIX and AUTHNULL credentials are both handled here.
> @@ -520,6 +521,12 @@ static int unix_gid_parse(struct cache_detail *cd,
> 		ug.gi->gid[i] = kgid;
> 	}
>
> +	/* Sort the groups before inserting this entry
> +	 * into the cache to avoid future corrutpions
> +	 * by multiple simultaneous attempts to sort this
> +	 * entry.
> +	 */
> +	groups_sort(ug.gi);
> 	ugp = unix_gid_lookup(cd, uid);
> 	if (ugp) {
> 		struct cache_head *ch;
> -- 
> 2.9.5
>
>