linux-kernel - Re: [PATCH -v3 1/5] Capabilities: document the order of arguments to cap

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Message-ID: <20081110142810.GA11561@us.ibm.com>
Date:	Mon, 10 Nov 2008 08:28:10 -0600
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Eric Paris <eparis@...hat.com>
Cc:	linux-kernel@...r.kernel.org, linux-audit@...hat.com,
	sgrubb@...hat.com, morgan@...nel.org, viro@...IV.linux.org.uk
Subject: Re: [PATCH -v3 1/5] Capabilities: document the order of arguments
	to cap_issubset

Quoting Eric Paris (eparis@...hat.com):
> Document the order of arguments for cap_issubset.  It's not instantly clear
> which order the argument should be in.  So give an example.
> 
> Signed-off-by: Eric Paris <eparis@...hat.com>

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

Thanks, Eric.

-serge

> ---
> 
>  include/linux/capability.h |    7 +++++++
>  1 files changed, 7 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/capability.h b/include/linux/capability.h
> index 9d1fe30..9f44150 100644
> --- a/include/linux/capability.h
> +++ b/include/linux/capability.h
> @@ -454,6 +454,13 @@ static inline int cap_isclear(const kernel_cap_t a)
>  	return 1;
>  }
> 
> +/*
> + * Check if "a" is a subset of "set".
> + * return 1 if ALL of the capabilities in "a" are also in "set"
> + *	cap_issubset(0101, 1111) will return 1
> + * return 0 if ANY of the capabilities in "a" are not in "set"
> + *	cap_issubset(1111, 0101) will return 0
> + */
>  static inline int cap_issubset(const kernel_cap_t a, const kernel_cap_t set)
>  {
>  	kernel_cap_t dest;
--
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