Hello, On Wednesday, March 8, 2023 8:46:57 AM EST Richard Du wrote: > I'm trying to define an audit rule with auditctl for clone() syscall, and I > would expect that the a0 of clone() syscall (i.e. the clone_flags > argument) without the CLONE_THREAD flag bit being set. > > int clone(int (*fn)(void *), void *stack, int flags, void *arg, ... > /* pid_t *parent_tid, void *tls, pid_t *child_tid */ ); > > From man page of auditctl, -F option build a rule file: name, operation, > value. > -F [n=v | n!=v | n<v | n>v | n<=v | n>=v | n&v | n&=v] > > I can understand that, the n&v (Audit_bitmask) means any bit of a bitmast > is set, and the n&=v (Audit_bittest) means all bits of a bitmask are set. > > While my question is, how to build a rule which means "none of bit of a > bitmask is set", i.e. ( ! n&=v ). If the current audit comparator dosen't > support this, can we add the support in furture? The comparator does not support this. This is a corner case in which this is the first time someone ever needed it. -Steve