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Add a way for the process to request cleanup of the kernel cache of

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the process arguments.  New arguments length zero causes the drop of
the pargs instead of allocation of useless zero-length buffer.

Submitted by:	Thomas Munro
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D16111
This commit is contained in:
Konstantin Belousov 2018-07-04 13:22:48 +00:00
parent b0af06052c
commit d6eff0832c
1 changed files with 14 additions and 5 deletions
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19
sys/kern/kern_proc.c
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@ -1988,11 +1988,20 @@ 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;