diff options
| author | kib <kib@FreeBSD.org> | 2012-08-15 15:56:21 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2012-08-15 15:56:21 +0000 |
| commit | 604f552e40a9a201162d6c070fd96bc504b30ff3 (patch) | |
| tree | a9682200639371dd135caf82e8d5130aa117d0c2 /sys/kern/subr_param.c | |
| parent | ba66fb6ab507c9347d6b74704834eddfad52ed48 (diff) | |
| download | FreeBSD-src-604f552e40a9a201162d6c070fd96bc504b30ff3.zip FreeBSD-src-604f552e40a9a201162d6c070fd96bc504b30ff3.tar.gz | |
Add a sysctl kern.pid_max, which limits the maximum pid the system is
allowed to allocate, and corresponding tunable with the same
name. Note that existing processes with higher pids are left intact.
MFC after: 1 week
Diffstat (limited to 'sys/kern/subr_param.c')
| -rw-r--r-- | sys/kern/subr_param.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/sys/kern/subr_param.c b/sys/kern/subr_param.c index 8c13336..1c6b867 100644 --- a/sys/kern/subr_param.c +++ b/sys/kern/subr_param.c @@ -41,12 +41,13 @@ __FBSDID("$FreeBSD$"); #include "opt_msgbuf.h" #include "opt_maxusers.h" -#include <sys/limits.h> #include <sys/param.h> #include <sys/systm.h> #include <sys/kernel.h> -#include <sys/sysctl.h> +#include <sys/limits.h> #include <sys/msgbuf.h> +#include <sys/sysctl.h> +#include <sys/proc.h> #include <vm/vm.h> #include <vm/vm_param.h> @@ -92,6 +93,7 @@ int ncallout; /* maximum # of timer events */ int nbuf; int ngroups_max; /* max # groups per process */ int nswbuf; +pid_t pid_max = PID_MAX; long maxswzone; /* max swmeta KVA storage */ long maxbcache; /* max buffer cache KVA storage */ long maxpipekva; /* Limit on pipe KVA */ @@ -250,6 +252,13 @@ init_param1(void) TUNABLE_INT_FETCH("kern.ngroups", &ngroups_max); if (ngroups_max < NGROUPS_MAX) ngroups_max = NGROUPS_MAX; + + /* + * Only allow to lower the maximal pid. + */ + TUNABLE_INT_FETCH("kern.pid_max", &pid_max); + if (pid_max > PID_MAX) + pid_max = PID_MAX; } /* |
