[src/trunk]: src/sys utrace(2): limit size of user data to KTR_USER_MAXLEN (c...

[jdolecek <jdolecek%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c725db9f135e
branches:  trunk
changeset: 501698:c725db9f135e
user:      jdolecek <jdolecek%NetBSD.org@localhost>
date:      Fri Jan 05 22:25:26 2001 +0000

description:
utrace(2): limit size of user data to KTR_USER_MAXLEN (currently 2048); return EINVAL if 'len' is bigger

diffstat:

 sys/kern/kern_ktrace.c |  5 ++++-
 sys/sys/ktrace.h       |  3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diffs (36 lines):

diff -r bcc42a01ad43 -r c725db9f135e sys/kern/kern_ktrace.c
--- a/sys/kern/kern_ktrace.c    Fri Jan 05 21:53:38 2001 +0000
+++ b/sys/kern/kern_ktrace.c    Fri Jan 05 22:25:26 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_ktrace.c,v 1.52 2001/01/05 21:42:09 jdolecek Exp $        */
+/*     $NetBSD: kern_ktrace.c,v 1.53 2001/01/05 22:25:26 jdolecek Exp $        */
 
 /*
  * Copyright (c) 1989, 1993
@@ -673,6 +673,9 @@
        if (!KTRPOINT(p, KTR_USER))
                return (0);
 
+       if (SCARG(uap, len) > KTR_USER_MAXLEN)
+               return (EINVAL);
+
        ktruser(p, SCARG(uap, label), SCARG(uap, addr), SCARG(uap, len), 1);
 
        return (0);
diff -r bcc42a01ad43 -r c725db9f135e sys/sys/ktrace.h
--- a/sys/sys/ktrace.h  Fri Jan 05 21:53:38 2001 +0000
+++ b/sys/sys/ktrace.h  Fri Jan 05 22:25:26 2001 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: ktrace.h,v 1.21 2000/12/28 11:10:17 jdolecek Exp $     */
+/*     $NetBSD: ktrace.h,v 1.22 2001/01/05 22:25:27 jdolecek Exp $     */
 
 /*
  * Copyright (c) 1988, 1993
@@ -145,6 +145,7 @@
  */
 #define        KTR_USER        8
 #define KTR_USER_MAXIDLEN      20
+#define KTR_USER_MAXLEN                2048    /* maximum length of passed data */
 struct ktr_user {
        char    ktr_id[KTR_USER_MAXIDLEN];      /* string id of caller */
        /*