add ax88772C AX88772C_eeprom_tools

hc

2024-05-10 61598093bbdd283a7edc367d900f223070ead8d2

 kernel/kernel/sys.c
..
..
@@ -644,6 +644,7 @@
644
644
 	struct cred *new;
645
645
 	int retval;
646
646
 	kuid_t kruid, keuid, ksuid;
647
+	bool ruid_new, euid_new, suid_new;
647
648
 
648
649
 	kruid = make_kuid(ns, ruid);
649
650
 	keuid = make_kuid(ns, euid);
..
..
@@ -658,24 +659,28 @@
658
659
 	if ((suid != (uid_t) -1) && !uid_valid(ksuid))
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660
 		return -EINVAL;
660
661
 
662
+	old = current_cred();
663
+
664
+	/* check for no-op */
665
+	if ((ruid == (uid_t) -1 || uid_eq(kruid, old->uid)) &&
666
+	    (euid == (uid_t) -1 || (uid_eq(keuid, old->euid) &&
667
+				    uid_eq(keuid, old->fsuid))) &&
668
+	    (suid == (uid_t) -1 || uid_eq(ksuid, old->suid)))
669
+		return 0;
670
+
671
+	ruid_new = ruid != (uid_t) -1        && !uid_eq(kruid, old->uid) &&
672
+		   !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid);
673
+	euid_new = euid != (uid_t) -1        && !uid_eq(keuid, old->uid) &&
674
+		   !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid);
675
+	suid_new = suid != (uid_t) -1        && !uid_eq(ksuid, old->uid) &&
676
+		   !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid);
677
+	if ((ruid_new || euid_new || suid_new) &&
678
+	    !ns_capable_setid(old->user_ns, CAP_SETUID))
679
+		return -EPERM;
680
+
661
681
 	new = prepare_creds();
662
682
 	if (!new)
663
683
 		return -ENOMEM;
664
-
665
-	old = current_cred();
666
-
667
-	retval = -EPERM;
668
-	if (!ns_capable_setid(old->user_ns, CAP_SETUID)) {
669
-		if (ruid != (uid_t) -1        && !uid_eq(kruid, old->uid) &&
670
-		    !uid_eq(kruid, old->euid) && !uid_eq(kruid, old->suid))
671
-			goto error;
672
-		if (euid != (uid_t) -1        && !uid_eq(keuid, old->uid) &&
673
-		    !uid_eq(keuid, old->euid) && !uid_eq(keuid, old->suid))
674
-			goto error;
675
-		if (suid != (uid_t) -1        && !uid_eq(ksuid, old->uid) &&
676
-		    !uid_eq(ksuid, old->euid) && !uid_eq(ksuid, old->suid))
677
-			goto error;
678
-	}
679
684
 
680
685
 	if (ruid != (uid_t) -1) {
681
686
 		new->uid = kruid;
..
..
@@ -736,6 +741,7 @@
736
741
 	struct cred *new;
737
742
 	int retval;
738
743
 	kgid_t krgid, kegid, ksgid;
744
+	bool rgid_new, egid_new, sgid_new;
739
745
 
740
746
 	krgid = make_kgid(ns, rgid);
741
747
 	kegid = make_kgid(ns, egid);
..
..
@@ -748,23 +754,28 @@
748
754
 	if ((sgid != (gid_t) -1) && !gid_valid(ksgid))
749
755
 		return -EINVAL;
750
756
 
757
+	old = current_cred();
758
+
759
+	/* check for no-op */
760
+	if ((rgid == (gid_t) -1 || gid_eq(krgid, old->gid)) &&
761
+	    (egid == (gid_t) -1 || (gid_eq(kegid, old->egid) &&
762
+				    gid_eq(kegid, old->fsgid))) &&
763
+	    (sgid == (gid_t) -1 || gid_eq(ksgid, old->sgid)))
764
+		return 0;
765
+
766
+	rgid_new = rgid != (gid_t) -1        && !gid_eq(krgid, old->gid) &&
767
+		   !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid);
768
+	egid_new = egid != (gid_t) -1        && !gid_eq(kegid, old->gid) &&
769
+		   !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid);
770
+	sgid_new = sgid != (gid_t) -1        && !gid_eq(ksgid, old->gid) &&
771
+		   !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid);
772
+	if ((rgid_new || egid_new || sgid_new) &&
773
+	    !ns_capable_setid(old->user_ns, CAP_SETGID))
774
+		return -EPERM;
775
+
751
776
 	new = prepare_creds();
752
777
 	if (!new)
753
778
 		return -ENOMEM;
754
-	old = current_cred();
755
-
756
-	retval = -EPERM;
757
-	if (!ns_capable_setid(old->user_ns, CAP_SETGID)) {
758
-		if (rgid != (gid_t) -1        && !gid_eq(krgid, old->gid) &&
759
-		    !gid_eq(krgid, old->egid) && !gid_eq(krgid, old->sgid))
760
-			goto error;
761
-		if (egid != (gid_t) -1        && !gid_eq(kegid, old->gid) &&
762
-		    !gid_eq(kegid, old->egid) && !gid_eq(kegid, old->sgid))
763
-			goto error;
764
-		if (sgid != (gid_t) -1        && !gid_eq(ksgid, old->gid) &&
765
-		    !gid_eq(ksgid, old->egid) && !gid_eq(ksgid, old->sgid))
766
-			goto error;
767
-	}
768
779
 
769
780
 	if (rgid != (gid_t) -1)
770
781
 		new->gid = krgid;
..
..
@@ -1558,6 +1569,8 @@
1558
1569
 
1559
1570
 	if (resource >= RLIM_NLIMITS)
1560
1571
 		return -EINVAL;
1572
+	resource = array_index_nospec(resource, RLIM_NLIMITS);
1573
+
1561
1574
 	if (new_rlim) {
1562
1575
 		if (new_rlim->rlim_cur > new_rlim->rlim_max)
1563
1576
 			return -EINVAL;