Currently the kernel audit system represents arch's as numbers and will gladly accept comparisons between archs using >, <, >=, <= when the only thing that makes sense is = or !=. I'm told that the next revision of auditctl will do this checking but this will provide enforcement in the kernel even for old userspace. A simple command to show the issue would be to run auditctl -d entry,always -F arch>i686 -S chmod with this patch the kernel will reject this with -EINVAL Please comment/ack/nak as soon as possible. -Eric kernel/auditfilter.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) --- linux-2.6.18.i686/kernel/auditfilter.c.audit.arch 2006-09-28 16:44:11.000000000 -0400 +++ linux-2.6.18.i686/kernel/auditfilter.c 2006-09-28 17:38:34.000000000 -0400 @@ -411,7 +411,6 @@ static struct audit_entry *audit_rule_to case AUDIT_FSGID: case AUDIT_LOGINUID: case AUDIT_PERS: - case AUDIT_ARCH: case AUDIT_MSGTYPE: case AUDIT_PPID: case AUDIT_DEVMAJOR: @@ -423,6 +422,14 @@ static struct audit_entry *audit_rule_to case AUDIT_ARG2: case AUDIT_ARG3: break; + /* arch is only allowed to be = or != */ + case AUDIT_ARCH: + if ((f->op != AUDIT_NOT_EQUAL) && (f->op != AUDIT_EQUAL) + && (f->op != AUDIT_NEGATE) && (f->op)) { + err = -EINVAL; + goto exit_free; + } + break; case AUDIT_PERM: if (f->val & ~15) goto exit_free;