Re: [PATCH ghak46 V1] audit: normalize MAC_STATUS record

On Mon, Apr 9, 2018 at 7:34 PM, Richard Guy Briggs <rgb(a)redhat.com&gt; 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(a)redhat.com&gt; > --- > 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).

> } > > length = count; > -- > 1.8.3.1