D12238.id32799.diff
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D12238.id32799.diff
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	Index: sys/kern/kern_fork.c
	===================================================================
	--- sys/kern/kern_fork.c
	+++ sys/kern/kern_fork.c
	@@ -210,8 +210,12 @@
	if (error == 0 && req->newptr != NULL) {
	if (pid < 0 \|\| pid > pid_max - 100) /* out of range */
	pid = pid_max - 100;
	- else if (pid < 2) /* NOP */
	- pid = 0;
	+ else if (pid == 1) {
	+ /*
	+ * Generate a random PID modulus, range: 100 to 999
	+ */
	+ pid = (uint64_t) arc4random() * (999 + 1 - 100) / UINT32_MAX + 100;
	+ }
	else if (pid < 100) /* Make it reasonable */
	pid = 100;
	randompid = pid;
	@@ -221,7 +225,7 @@
	}

	SYSCTL_PROC(_kern, OID_AUTO, randompid, CTLTYPE_INT\|CTLFLAG_RW,
	- 0, 0, sysctl_kern_randompid, "I", "Random PID modulus");
	+ 0, 0, sysctl_kern_randompid, "I", "Random PID modulus. Special values: 0: disable, 1: choose random value");

	static int
	fork_findpid(int flags)