Date: Thu, 31 May 2001 21:50:07 -0700 From: Dima Dorfman <dima@unixfreak.org> To: audit@freebsd.org Subject: sysctl fix for zero-length data Message-ID: <20010601045007.629243E2F@bazooka.unixfreak.org>
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Please review the attached patch to fix the sysctl interface to accept
data of zero length. This fixes the case where one wants to clear a
string exported via sysctl, as in:
sysctl kern.hostname=
Right now, the above will do nothing. With this patch, it will clear
(i.e., set to "") "kern.hostname".
Thanks,
Dima Dorfman
dima@unixfreak.org
Index: kern_sysctl.c
===================================================================
RCS file: /stl/src/FreeBSD/src/sys/kern/kern_sysctl.c,v
retrieving revision 1.107
diff -u -r1.107 kern_sysctl.c
--- kern_sysctl.c 2001/05/19 05:45:55 1.107
+++ kern_sysctl.c 2001/06/01 04:46:47
@@ -862,7 +907,7 @@
req.oldptr= old;
}
- if (newlen) {
+ if (new != NULL) {
req.newlen = newlen;
req.newptr = new;
}
@@ -1126,7 +1171,7 @@
req.oldptr= old;
}
- if (newlen) {
+ if (new != NULL) {
if (!useracc(new, req.newlen, VM_PROT_READ))
return (EFAULT);
req.newlen = newlen;
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