linux-kernel - Re: [PATCH 2/6] KEYS: Allow keyctl_revoke() on keys that have SETATTR but not WRITE perm

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Date:	Tue, 4 Aug 2009 10:17:47 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	David Howells <dhowells@...hat.com>
Cc:	torvalds@...l.org, akpm@...ux-foundation.org, jmorris@...ei.org,
	linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 2/6] KEYS: Allow keyctl_revoke() on keys that have
	SETATTR but not WRITE perm

Quoting David Howells (dhowells@...hat.com):
> Allow keyctl_revoke() to operate on keys that have SETATTR but not WRITE
> permission, rather than only on keys that have WRITE permission.
> 
> Signed-off-by: David Howells <dhowells@...hat.com>

Code seems to match the comment, and I see no docs saying this (SETATTR
implies revoke) shouldn't be the case, so I guess that call is purely
up to you :)

Acked-by: Serge Hallyn <serue@...ibm.com>

> ---
> 
>  security/keys/keyctl.c |    8 +++++++-
>  1 files changed, 7 insertions(+), 1 deletions(-)
> 
> 
> diff --git a/security/keys/keyctl.c b/security/keys/keyctl.c
> index b85ace2..1160b64 100644
> --- a/security/keys/keyctl.c
> +++ b/security/keys/keyctl.c
> @@ -343,7 +343,13 @@ long keyctl_revoke_key(key_serial_t id)
>  	key_ref = lookup_user_key(id, 0, KEY_WRITE);
>  	if (IS_ERR(key_ref)) {
>  		ret = PTR_ERR(key_ref);
> -		goto error;
> +		if (ret != -EACCES)
> +			goto error;
> +		key_ref = lookup_user_key(id, 0, KEY_SETATTR);
> +		if (IS_ERR(key_ref)) {
> +			ret = PTR_ERR(key_ref);
> +			goto error;
> +		}
>  	}
> 
>  	key_revoke(key_ref_to_ptr(key_ref));
--
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