linux-kernel - Re: [PATCH] bsdacct: fix uid/gid misreporting (#14676)

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Message-ID: <20091201184957.27a2aaab@leela>
Date:	Tue, 1 Dec 2009 18:49:57 +0100
From:	Michal Schmidt <mschmidt@...hat.com>
To:	Alexey Dobriyan <adobriyan@...il.com>
Cc:	akpm@...ux-foundation.org, jkj@...si.fi,
	linux-kernel@...r.kernel.org, dhowells@...hat.com,
	serue@...ibm.com, jmorris@...ei.org, stable@...nel.org
Subject: Re: [PATCH] bsdacct: fix uid/gid misreporting (#14676)

On Tue, 1 Dec 2009 01:40:32 +0300 Alexey Dobriyan wrote:
> commit d8e180dcd5bbbab9cd3ff2e779efcf70692ef541
> "bsdacct: switch credentials for writing to the accounting file"
> introduced credential switching during final acct data collecting.
> However, uid/gid pair continued to be collected from current which
> became credentials of who created acct file, not who exits.
> 
> Fix http://bugzilla.kernel.org/show_bug.cgi?id=14676
> 
> Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>

Ah, indeed. The original commit went into 2.6.31-stable so this one
should too.

Reviewed-by: Michal Schmidt <mschmidt@...hat.com>

> 
>  Juho, please, confirm.
> 
>  kernel/acct.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> --- a/kernel/acct.c
> +++ b/kernel/acct.c
> @@ -536,7 +536,8 @@ static void do_acct_process(struct
> bsd_acct_struct *acct, do_div(elapsed, AHZ);
>  	ac.ac_btime = get_seconds() - elapsed;
>  	/* we really need to bite the bullet and change layout */
> -	current_uid_gid(&ac.ac_uid, &ac.ac_gid);
> +	ac.ac_uid = orig_cred->uid;
> +	ac.ac_gid = orig_cred->gid;
>  #if ACCT_VERSION==2
>  	ac.ac_ahz = AHZ;
>  #endif

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