linux-kernel - Re: [PATCH 1/2] capability: add cap

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Message-ID: <20230114193302.GB23094@mail.hallyn.com>
Date:   Sat, 14 Jan 2023 13:33:02 -0600
From:   "Serge E. Hallyn" <serge@...lyn.com>
To:     Mateusz Guzik <mjguzik@...il.com>
Cc:     viro@...iv.linux.org.uk, serge@...lyn.com,
        torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-security-module@...r.kernel.org
Subject: Re: [PATCH 1/2] capability: add cap_isidentical

On Sat, Jan 14, 2023 at 07:02:23PM +0100, Mateusz Guzik wrote:
> Signed-off-by: Mateusz Guzik <mjguzik@...il.com>

Reviewed-by: Serge Hallyn <serge@...lyn.com>

> ---
>  include/linux/capability.h | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/include/linux/capability.h b/include/linux/capability.h
> index 65efb74c3585..736a973c677a 100644
> --- a/include/linux/capability.h
> +++ b/include/linux/capability.h
> @@ -156,6 +156,16 @@ static inline bool cap_isclear(const kernel_cap_t a)
>  	return true;
>  }
>  
> +static inline bool cap_isidentical(const kernel_cap_t a, const kernel_cap_t b)
> +{
> +	unsigned __capi;
> +	CAP_FOR_EACH_U32(__capi) {
> +		if (a.cap[__capi] != b.cap[__capi])
> +			return false;
> +	}
> +	return true;
> +}
> +
>  /*
>   * Check if "a" is a subset of "set".
>   * return true if ALL of the capabilities in "a" are also in "set"
> -- 
> 2.34.1