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SubjectRe: [PATCH ghak46 V1] audit: normalize MAC_STATUS record
On 2018-04-17 17:59, Paul Moore wrote:
> On Wed, Apr 11, 2018 at 5:08 PM, Paul Moore <paul@paul-moore.com> wrote:
> > On Mon, Apr 9, 2018 at 7:34 PM, Richard Guy Briggs <rgb@redhat.com> wrote:
> >> There were two formats of the audit MAC_STATUS record, one of which was more
> >> standard than the other. One listed enforcing status changes and the
> >> other listed enabled status changes with a non-standard label. In
> >> addition, the record was missing information about which LSM was
> >> responsible and the operation's completion status. While this record is
> >> only issued on success, the parser expects the res= field to be present.
> >>
> >> old enforcing/permissive:
> >> type=MAC_STATUS msg=audit(1523312831.378:24514): enforcing=0 old_enforcing=1 auid=0 ses=1
> >> old enable/disable:
> >> type=MAC_STATUS msg=audit(1523312831.378:24514): selinux=0 auid=0 ses=1
> >>
> >> List both sets of status and old values and add the lsm= field and the
> >> res= field.
> >>
> >> Here is the new format:
> >> type=MAC_STATUS msg=audit(1523293828.657:891): enforcing=0 old_enforcing=1 auid=0 ses=1 enabled=1 old-enabled=1 lsm=selinux res=1
> >>
> >> This record already accompanied a SYSCALL record.
> >>
> >> See: https://github.com/linux-audit/audit-kernel/issues/46
> >> Signed-off-by: Richard Guy Briggs <rgb@redhat.com>
> >> ---
> >> security/selinux/selinuxfs.c | 11 +++++++----
> >> 1 file changed, 7 insertions(+), 4 deletions(-)
> >>
> >> diff --git a/security/selinux/selinuxfs.c b/security/selinux/selinuxfs.c
> >> index 00eed84..00b21b2 100644
> >> --- a/security/selinux/selinuxfs.c
> >> +++ b/security/selinux/selinuxfs.c
> >> @@ -145,10 +145,11 @@ static ssize_t sel_write_enforce(struct file *file, const char __user *buf,
> >> if (length)
> >> goto out;
> >> audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
> >> - "enforcing=%d old_enforcing=%d auid=%u ses=%u",
> >> + "enforcing=%d old_enforcing=%d auid=%u ses=%u"
> >> + " enabled=%d old-enabled=%d lsm=selinux res=1",
> >> new_value, selinux_enforcing,
> >> from_kuid(&init_user_ns, audit_get_loginuid(current)),
> >> - audit_get_sessionid(current));
> >> + audit_get_sessionid(current), selinux_enabled, selinux_enabled);
> >
> > This looks fine.
> >
> >> selinux_enforcing = new_value;
> >> if (selinux_enforcing)
> >> avc_ss_reset(0);
> >> @@ -272,9 +273,11 @@ static ssize_t sel_write_disable(struct file *file, const char __user *buf,
> >> if (length)
> >> goto out;
> >> audit_log(current->audit_context, GFP_KERNEL, AUDIT_MAC_STATUS,
> >> - "selinux=0 auid=%u ses=%u",
> >> + "enforcing=%d old_enforcing=%d auid=%u ses=%u"
> >> + " enabled=%d old-enabled=%d lsm=selinux res=1",
> >> + selinux_enforcing, selinux_enforcing,
> >> from_kuid(&init_user_ns, audit_get_loginuid(current)),
> >> - audit_get_sessionid(current));
> >> + audit_get_sessionid(current), 0, 1);
> >
> > It needs to be said again that I'm opposed to changes like this:
> > inserting new fields, removing fields, or otherwise changing the
> > format in ways that aren't strictly the addition of new fields to the
> > end of a record is a Bad Thing. However, there are exceptions (there
> > are *always* exceptions), and this seems like a reasonable change that
> > shouldn't negatively affect anyone.
> >
> > I'll merge this once the merge window comes to a close (we are going
> > to need to base selinux/next on v4.17-rc1).
>
> Merged into selinux/next, although I should mention that there were
> some actual code changes because of the SELinux state consolidation
> patches that went into v4.17. The changes were small but please take
> a look and make sure everything still looks okay to you.

Ok, that was a bit disruptive, but looks ok to me.

> >> }
> >>
> >> length = count;
> >> --
> >> 1.8.3.1
>
> --
> paul moore
> www.paul-moore.com

- RGB

--
Richard Guy Briggs <rgb@redhat.com>
Sr. S/W Engineer, Kernel Security, Base Operating Systems
Remote, Ottawa, Red Hat Canada
IRC: rgb, SunRaycer
Voice: +1.647.777.2635, Internal: (81) 32635

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