In the case of an error returned from a field check in an audit filter syscall rule, it is treated as a match and the rule action is honoured.
This could cause a rule with a default of NEVER and an selinux field check error to avoid logging. Recommend matching with an action of ALWAYS to catch malicious abuse of this bug. The downside of this approach is it could DoS the audit subsystem. Signed-off-by: Richard Guy Briggs <[email protected]> --- kernel/auditsc.c | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 71e14d8..6123672 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -683,6 +683,10 @@ static int audit_filter_rules(struct task_struct *tsk, } if (!result) return 0; + if (result < 0) { + *state = AUDIT_RECORD_CONTEXT; + return 1; + } } if (ctx) { -- 1.7.1
