Date: Wed, 11 Jul 2018 19:23:11 +0000 (UTC) From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r336204 - stable/11/sys/kern Message-ID: <201807111923.w6BJNBlW096468@repo.freebsd.org>
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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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