linux-kernel - Re: [RFC] capabilities: Ambient capabilities

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 30 Mar 2015 07:55:04 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	"Andrew G. Morgan" <morgan@...nel.org>
cc:	Andy Lutomirski <luto@...capital.net>,
	Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
	Ted Ts'o <tytso@....edu>, Andrew Lutomirski <luto@...nel.org>,
	Andrew Morton <akpm@...uxfoundation.org>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Linux API <linux-api@...r.kernel.org>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	linux-security-module <linux-security-module@...r.kernel.org>,
	Aaron Jones <aaronmdjones@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	Markku Savela <msa@...h.iki.fi>,
	Kees Cook <keescook@...omium.org>,
	Jonathan Corbet <corbet@....net>
Subject: Re: [RFC] capabilities: Ambient capabilities

On Sat, 14 Mar 2015, Andrew G. Morgan wrote:

>
> I thought I did. Please implement a lockable secure bit and I will

Would this suffice? It puts the CAP_SETPCAP limitation back to how it
was in my earlier patch.



Subject: ambient caps: Allow disabling with SETPCAP

Do not allow setting ambient caps if CAP_SETPCAP is not set.

Signed-off-by: Christoph Lameter <cl@...ux.com>

Index: linux/security/commoncap.c
===================================================================
--- linux.orig/security/commoncap.c
+++ linux/security/commoncap.c
@@ -962,6 +962,9 @@ int cap_task_prctl(int option, unsigned
 		if (((!cap_valid(arg3)) | arg4 | arg5))
 			return -EINVAL;

+		if (!ns_capable(current_user_ns(), CAP_SETPCAP))
+			return -EPERM;
+
 		if (arg2 == PR_CAP_AMBIENT_GET) {
 			return !!cap_raised(current_cred()->cap_ambient, arg3);
 		} else if (arg2 != PR_CAP_AMBIENT_RAISE &&
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/