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authorEric Paris <eparis@redhat.com>2008-01-07 18:14:19 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2008-02-01 14:24:39 -0500
commit50397bd1e471391d27f64efad9271459c913de87 (patch)
tree2b23b983ebcb9085cbf38c1688ba0c0f28ccfd2f /kernel
parent1a6b9f2317f18db768010252c957d99daf40678f (diff)
[AUDIT] clean up audit_receive_msg()
generally clean up audit_receive_msg() don't free random memory if selinux_sid_to_string fails for some reason. Move generic auditing to a helper function Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/audit.c169
1 files changed, 66 insertions, 103 deletions
diff --git a/kernel/audit.c b/kernel/audit.c
index 7e29372da284..549b2f55b649 100644
--- a/kernel/audit.c
+++ b/kernel/audit.c
@@ -152,8 +152,10 @@ struct audit_buffer {
152 152
153static void audit_set_pid(struct audit_buffer *ab, pid_t pid) 153static void audit_set_pid(struct audit_buffer *ab, pid_t pid)
154{ 154{
155 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb); 155 if (ab) {
156 nlh->nlmsg_pid = pid; 156 struct nlmsghdr *nlh = nlmsg_hdr(ab->skb);
157 nlh->nlmsg_pid = pid;
158 }
157} 159}
158 160
159void audit_panic(const char *message) 161void audit_panic(const char *message)
@@ -511,6 +513,33 @@ static int audit_netlink_ok(struct sk_buff *skb, u16 msg_type)
511 return err; 513 return err;
512} 514}
513 515
516static int audit_log_common_recv_msg(struct audit_buffer **ab, u16 msg_type,
517 u32 pid, u32 uid, uid_t auid, u32 sid)
518{
519 int rc = 0;
520 char *ctx = NULL;
521 u32 len;
522
523 if (!audit_enabled) {
524 *ab = NULL;
525 return rc;
526 }
527
528 *ab = audit_log_start(NULL, GFP_KERNEL, msg_type);
529 audit_log_format(*ab, "user pid=%d uid=%u auid=%u",
530 pid, uid, auid);
531 if (sid) {
532 rc = selinux_sid_to_string(sid, &ctx, &len);
533 if (rc)
534 audit_log_format(*ab, " ssid=%u", sid);
535 else
536 audit_log_format(*ab, " subj=%s", ctx);
537 kfree(ctx);
538 }
539
540 return rc;
541}
542
514static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) 543static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
515{ 544{
516 u32 uid, pid, seq, sid; 545 u32 uid, pid, seq, sid;
@@ -521,7 +550,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
521 u16 msg_type = nlh->nlmsg_type; 550 u16 msg_type = nlh->nlmsg_type;
522 uid_t loginuid; /* loginuid of sender */ 551 uid_t loginuid; /* loginuid of sender */
523 struct audit_sig_info *sig_data; 552 struct audit_sig_info *sig_data;
524 char *ctx; 553 char *ctx = NULL;
525 u32 len; 554 u32 len;
526 555
527 err = audit_netlink_ok(skb, msg_type); 556 err = audit_netlink_ok(skb, msg_type);
@@ -602,36 +631,22 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
602 if (err) 631 if (err)
603 break; 632 break;
604 } 633 }
605 ab = audit_log_start(NULL, GFP_KERNEL, msg_type); 634 audit_log_common_recv_msg(&ab, msg_type, pid, uid,
606 if (ab) { 635 loginuid, sid);
607 audit_log_format(ab, 636
608 "user pid=%d uid=%u auid=%u", 637 if (msg_type != AUDIT_USER_TTY)
609 pid, uid, loginuid); 638 audit_log_format(ab, " msg='%.1024s'",
610 if (sid) { 639 (char *)data);
611 if (selinux_sid_to_string( 640 else {
612 sid, &ctx, &len)) { 641 int size;
613 audit_log_format(ab, 642
614 " ssid=%u", sid); 643 audit_log_format(ab, " msg=");
615 /* Maybe call audit_panic? */ 644 size = nlmsg_len(nlh);
616 } else 645 audit_log_n_untrustedstring(ab, size,
617 audit_log_format(ab, 646 data);
618 " subj=%s", ctx);
619 kfree(ctx);
620 }
621 if (msg_type != AUDIT_USER_TTY)
622 audit_log_format(ab, " msg='%.1024s'",
623 (char *)data);
624 else {
625 int size;
626
627 audit_log_format(ab, " msg=");
628 size = nlmsg_len(nlh);
629 audit_log_n_untrustedstring(ab, size,
630 data);
631 }
632 audit_set_pid(ab, pid);
633 audit_log_end(ab);
634 } 647 }
648 audit_set_pid(ab, pid);
649 audit_log_end(ab);
635 } 650 }
636 break; 651 break;
637 case AUDIT_ADD: 652 case AUDIT_ADD:
@@ -639,27 +654,12 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
639 if (nlmsg_len(nlh) < sizeof(struct audit_rule)) 654 if (nlmsg_len(nlh) < sizeof(struct audit_rule))
640 return -EINVAL; 655 return -EINVAL;
641 if (audit_enabled == AUDIT_LOCKED) { 656 if (audit_enabled == AUDIT_LOCKED) {
642 ab = audit_log_start(NULL, GFP_KERNEL, 657 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
643 AUDIT_CONFIG_CHANGE); 658 uid, loginuid, sid);
644 if (ab) { 659
645 audit_log_format(ab, 660 audit_log_format(ab, " audit_enabled=%d res=0",
646 "pid=%d uid=%u auid=%u", 661 audit_enabled);
647 pid, uid, loginuid); 662 audit_log_end(ab);
648 if (sid) {
649 if (selinux_sid_to_string(
650 sid, &ctx, &len)) {
651 audit_log_format(ab,
652 " ssid=%u", sid);
653 /* Maybe call audit_panic? */
654 } else
655 audit_log_format(ab,
656 " subj=%s", ctx);
657 kfree(ctx);
658 }
659 audit_log_format(ab, " audit_enabled=%d res=0",
660 audit_enabled);
661 audit_log_end(ab);
662 }
663 return -EPERM; 663 return -EPERM;
664 } 664 }
665 /* fallthrough */ 665 /* fallthrough */
@@ -673,27 +673,12 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
673 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data)) 673 if (nlmsg_len(nlh) < sizeof(struct audit_rule_data))
674 return -EINVAL; 674 return -EINVAL;
675 if (audit_enabled == AUDIT_LOCKED) { 675 if (audit_enabled == AUDIT_LOCKED) {
676 ab = audit_log_start(NULL, GFP_KERNEL, 676 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
677 AUDIT_CONFIG_CHANGE); 677 uid, loginuid, sid);
678 if (ab) { 678
679 audit_log_format(ab, 679 audit_log_format(ab, " audit_enabled=%d res=0",
680 "pid=%d uid=%u auid=%u", 680 audit_enabled);
681 pid, uid, loginuid); 681 audit_log_end(ab);
682 if (sid) {
683 if (selinux_sid_to_string(
684 sid, &ctx, &len)) {
685 audit_log_format(ab,
686 " ssid=%u", sid);
687 /* Maybe call audit_panic? */
688 } else
689 audit_log_format(ab,
690 " subj=%s", ctx);
691 kfree(ctx);
692 }
693 audit_log_format(ab, " audit_enabled=%d res=0",
694 audit_enabled);
695 audit_log_end(ab);
696 }
697 return -EPERM; 682 return -EPERM;
698 } 683 }
699 /* fallthrough */ 684 /* fallthrough */
@@ -704,19 +689,10 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
704 break; 689 break;
705 case AUDIT_TRIM: 690 case AUDIT_TRIM:
706 audit_trim_trees(); 691 audit_trim_trees();
707 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); 692
708 if (!ab) 693 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
709 break; 694 uid, loginuid, sid);
710 audit_log_format(ab, "auid=%u", loginuid); 695
711 if (sid) {
712 u32 len;
713 ctx = NULL;
714 if (selinux_sid_to_string(sid, &ctx, &len))
715 audit_log_format(ab, " ssid=%u", sid);
716 else
717 audit_log_format(ab, " subj=%s", ctx);
718 kfree(ctx);
719 }
720 audit_log_format(ab, " op=trim res=1"); 696 audit_log_format(ab, " op=trim res=1");
721 audit_log_end(ab); 697 audit_log_end(ab);
722 break; 698 break;
@@ -746,22 +722,9 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
746 /* OK, here comes... */ 722 /* OK, here comes... */
747 err = audit_tag_tree(old, new); 723 err = audit_tag_tree(old, new);
748 724
749 ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_CONFIG_CHANGE); 725 audit_log_common_recv_msg(&ab, AUDIT_CONFIG_CHANGE, pid,
750 if (!ab) { 726 uid, loginuid, sid);
751 kfree(old); 727
752 kfree(new);
753 break;
754 }
755 audit_log_format(ab, "auid=%u", loginuid);
756 if (sid) {
757 u32 len;
758 ctx = NULL;
759 if (selinux_sid_to_string(sid, &ctx, &len))
760 audit_log_format(ab, " ssid=%u", sid);
761 else
762 audit_log_format(ab, " subj=%s", ctx);
763 kfree(ctx);
764 }
765 audit_log_format(ab, " op=make_equiv old="); 728 audit_log_format(ab, " op=make_equiv old=");
766 audit_log_untrustedstring(ab, old); 729 audit_log_untrustedstring(ab, old);
767 audit_log_format(ab, " new="); 730 audit_log_format(ab, " new=");
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-25 16:32:11 -0500