Author: kib
Date: Wed Jul 11 19:23:11 2018
New Revision: 336204
URL: https://svnweb.freebsd.org/changeset/base/336204
Log:
MFC r335935:
Add a way for the process to request cleanup of the kernel cache of
the process arguments.
Modified:
stable/11/sys/kern/kern_proc.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/kern/kern_proc.c
==============================================================================
--- stable/11/sys/kern/kern_proc.c Wed Jul 11 18:53:18 2018
(r336203)
+++ stable/11/sys/kern/kern_proc.c Wed Jul 11 19:23:11 2018
(r336204)
@@ -1945,11 +1945,20 @@ sysctl_kern_proc_args(SYSCTL_HANDLER_ARGS)
if (req->newlen > ps_arg_cache_limit - sizeof(struct pargs))
return (ENOMEM);
- newpa = pargs_alloc(req->newlen);
- error = SYSCTL_IN(req, newpa->ar_args, req->newlen);
- if (error != 0) {
- pargs_free(newpa);
- return (error);
+
+ if (req->newlen == 0) {
+ /*
+ * Clear the argument pointer, so that we'll fetch arguments
+ * with proc_getargv() until further notice.
+ */
+ newpa = NULL;
+ } else {
+ newpa = pargs_alloc(req->newlen);
+ error = SYSCTL_IN(req, newpa->ar_args, req->newlen);
+ if (error != 0) {
+ pargs_free(newpa);
+ return (error);
+ }
}
PROC_LOCK(p);
pa = p->p_args;
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