[libvirt] [PATCH] fix AppArmor security driver when libvirt is compiled with libcap-ng
Daniel P. Berrange
berrange at redhat.com
Wed Feb 10 09:20:33 UTC 2010
On Mon, Feb 08, 2010 at 11:05:50AM -0600, Jamie Strandboge wrote:
> The calls to virExec() in security_apparmor.c when invoking
> virt-aa-helper use VIR_EXEC_CLEAR_CAPS. When compiled without libcap-ng,
> this is not a problem (it's effectively a no-op) but with libcap-ng this
> causes MAC_ADMIN to be cleared. MAC_ADMIN is needed by virt-aa-helper to
> manipulate apparmor profiles and without it VMs will not start[1]. This
> patch calls virExec with the default VIR_EXEC_NONE instead.
>
> [1] https://bugs.launchpad.net/ubuntu/+source/libvirt/+bug/517714
>
> --
> Jamie Strandboge | http://www.canonical.com
> Author: Jamie Strandboge <jamie at ubuntu.com>
> Description: Don't clear capabilities when calling virt-aa-helper. When built
> with libcap-ng, clearing caps makes virt-aa-helper lose MAC_ADMIN, which is
> (obviously) needed by apparmor_parser. This restores libcap-ng behavior to
> what it was when not built with libcap-ng.
> diff -Nur libvirt-0.7.5/src/security/security_apparmor.c libvirt-0.7.5.new/src/security/security_apparmor.c
> --- libvirt-0.7.5/src/security/security_apparmor.c 2009-12-22 03:37:57.000000000 -0600
> +++ libvirt-0.7.5.new/src/security/security_apparmor.c 2010-02-05 16:32:53.588796032 -0600
> @@ -174,19 +174,19 @@
> VIRT_AA_HELPER, "-c", "-u", profile, NULL
> };
> ret = virExec(conn, argv, NULL, NULL, &child,
> - pipefd[0], NULL, NULL, VIR_EXEC_CLEAR_CAPS);
> + pipefd[0], NULL, NULL, VIR_EXEC_NONE);
> } else if (disk && disk->src) {
> const char *const argv[] = {
> VIRT_AA_HELPER, "-r", "-u", profile, "-f", disk->src, NULL
> };
> ret = virExec(conn, argv, NULL, NULL, &child,
> - pipefd[0], NULL, NULL, VIR_EXEC_CLEAR_CAPS);
> + pipefd[0], NULL, NULL, VIR_EXEC_NONE);
> } else {
> const char *const argv[] = {
> VIRT_AA_HELPER, "-r", "-u", profile, NULL
> };
> ret = virExec(conn, argv, NULL, NULL, &child,
> - pipefd[0], NULL, NULL, VIR_EXEC_CLEAR_CAPS);
> + pipefd[0], NULL, NULL, VIR_EXEC_NONE);
> }
> if (ret < 0)
> goto clean;
ACK,
though it'd be nice to make this use virExecHook and provide a hook that
drops all the capabilities it does not need. eg everything except for
MAC_ADMIN ? If it needs CAP_SYS_ADMIN though it wouldn't be worthwhile
Daniel
--
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