linux-kernel - Re: [PATCH -v2 3/4] AUDIT: collect info when execve results in caps in pE

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Message-ID: <20081104163540.GA24318@us.ibm.com>
Date:	Tue, 4 Nov 2008 10:35:40 -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 -v2 3/4] AUDIT: collect info when execve results in
	caps in pE

Quoting Eric Paris (eparis@...hat.com):
> diff --git a/security/commoncap.c b/security/commoncap.c
> index 8bb95ed..534abb5 100644
> --- a/security/commoncap.c
> +++ b/security/commoncap.c
> @@ -8,6 +8,7 @@
>   */
> 
>  #include <linux/capability.h>
> +#include <linux/audit.h>
>  #include <linux/module.h>
>  #include <linux/init.h>
>  #include <linux/kernel.h>
> @@ -373,6 +374,9 @@ int cap_bprm_set_security (struct linux_binprm *bprm)
> 
>  void cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
>  {
> +	kernel_cap_t pP = current->cap_permitted;
> +	kernel_cap_t pE = current->cap_effective;
> +
>  	if (bprm->e_uid != current->uid || bprm->e_gid != current->gid ||
>  	    !cap_issubset(bprm->cap_post_exec_permitted,
>  			  current->cap_permitted)) {
> @@ -407,6 +411,12 @@ void cap_bprm_apply_creds (struct linux_binprm *bprm, int unsafe)
>  	}
> 
>  	/* AUD: Audit candidate if current->cap_effective is set */
> +	if (!cap_isclear(current->cap_effective)) {
> +		if (!cap_issubset(current->cap_effective, CAP_FULL_SET) ||

Hi Eric,

can you explain what the cap_issubset() check is for here?

thanks,
-serge

> +		    (bprm->e_uid != 0) || (current->uid != 0) ||
> +		    issecure(SECURE_NOROOT))
> +			audit_log_bprm_fcaps(bprm, &pP, &pE);
> +	}
> 
>  	current->securebits &= ~issecure_mask(SECURE_KEEP_CAPS);
>  }
--
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