[PATCH 1/3] selinux: call WARN_ONCE() instead of calling audit_log_start()
Two of the conditions in selinux_audit_rule_match() should never happen and the third indicates a race that should be retried. Remove the calls to audit_log() (which call audit_log_start()) and deal with the errors in the caller, logging only once if the condition is met. Calling audit_log_start() in this location makes buffer allocation and locking more complicated in the calling tree (audit_filter_user()). Signed-off-by: Richard Guy Briggs --- security/selinux/ss/services.c | 12 1 files changed, 4 insertions(+), 8 deletions(-) diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index b4feecc..f4dda05 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -2938,25 +2938,21 @@ int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, struct selinux_audit_rule *rule = vrule; int match = 0; - if (!rule) { - audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, - "selinux_audit_rule_match: missing rule\n"); + if (unlikely(!rule)) { + WARN_ONCE(1, "selinux_audit_rule_match: missing rule\n"); return -ENOENT; } read_lock(_rwlock); if (rule->au_seqno < latest_granting) { - audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, - "selinux_audit_rule_match: stale rule\n"); match = -ESTALE; goto out; } ctxt = sidtab_search(, sid); - if (!ctxt) { - audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, - "selinux_audit_rule_match: unrecognized SID %d\n", + if (unlikely(!ctxt)) { + WARN_ONCE(1, "selinux_audit_rule_match: unrecognized SID %d\n", sid); match = -ENOENT; goto out; -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
[PATCH 1/3] selinux: call WARN_ONCE() instead of calling audit_log_start()
Two of the conditions in selinux_audit_rule_match() should never happen and the third indicates a race that should be retried. Remove the calls to audit_log() (which call audit_log_start()) and deal with the errors in the caller, logging only once if the condition is met. Calling audit_log_start() in this location makes buffer allocation and locking more complicated in the calling tree (audit_filter_user()). Signed-off-by: Richard Guy Briggs r...@redhat.com --- security/selinux/ss/services.c | 12 1 files changed, 4 insertions(+), 8 deletions(-) diff --git a/security/selinux/ss/services.c b/security/selinux/ss/services.c index b4feecc..f4dda05 100644 --- a/security/selinux/ss/services.c +++ b/security/selinux/ss/services.c @@ -2938,25 +2938,21 @@ int selinux_audit_rule_match(u32 sid, u32 field, u32 op, void *vrule, struct selinux_audit_rule *rule = vrule; int match = 0; - if (!rule) { - audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, - selinux_audit_rule_match: missing rule\n); + if (unlikely(!rule)) { + WARN_ONCE(1, selinux_audit_rule_match: missing rule\n); return -ENOENT; } read_lock(policy_rwlock); if (rule-au_seqno latest_granting) { - audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, - selinux_audit_rule_match: stale rule\n); match = -ESTALE; goto out; } ctxt = sidtab_search(sidtab, sid); - if (!ctxt) { - audit_log(actx, GFP_ATOMIC, AUDIT_SELINUX_ERR, - selinux_audit_rule_match: unrecognized SID %d\n, + if (unlikely(!ctxt)) { + WARN_ONCE(1, selinux_audit_rule_match: unrecognized SID %d\n, sid); match = -ENOENT; goto out; -- 1.7.1 -- To unsubscribe from this list: send the line unsubscribe linux-kernel in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/