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Part I of RLIMIT_VMEM implementation. Implement core functionality for

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a new resource limit that covers a process's entire VM space, including
mmap()'d space.

(Part II will be additional code to check RLIMIT_VMEM during exec() but it
needs more fleshing out).

PR:		kern/18209
Submitted by:	Andrey Alekseyev <uitm@zenon.net>, Dmitry Kim <jason@nichego.net>
MFC after:	7 days
This commit is contained in:
Matthew Dillon 2002-06-26 00:29:28 +00:00
parent 4e77f68011
commit 070f64fe6f
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=98833
3 changed files with 15 additions and 1 deletions
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4
sys/sys/resource.h
View File

@ -91,8 +91,9 @@ struct rusage {
#define RLIMIT_NPROC 7 /* number of processes */
#define RLIMIT_NOFILE 8 /* number of open files */
#define RLIMIT_SBSIZE 9 /* maximum size of all socket buffers */
#define RLIMIT_VMEM 10 /* virtual process size (inclusive of mmap) */
#define RLIM_NLIMITS 10 /* number of resource limits */
#define RLIM_NLIMITS 11 /* number of resource limits */
#define RLIM_INFINITY ((rlim_t)(((u_quad_t)1 << 63) - 1))
@ -113,6 +114,7 @@ static char *rlimit_ident[] = {
"nproc",
"nofile",
"sbsize",
"vmem",
};
#endif

7
sys/vm/vm_mmap.c
View File

@ -55,6 +55,8 @@
#include <sys/sysproto.h>
#include <sys/filedesc.h>
#include <sys/proc.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/vnode.h>
#include <sys/fcntl.h>
#include <sys/file.h>
@ -1124,6 +1126,11 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
objsize = size = round_page(size);
if (td->td_proc->p_vmspace->vm_map.size + size >
td->td_proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
return(ENOMEM);
}
/*
* We currently can only deal with page aligned file offsets.
* The check is here rather than in the syscall because the

5
sys/vm/vm_unix.c
View File

@ -107,6 +107,11 @@ obreak(td, uap)
goto done;
}
if (new > old) {
if (vm->vm_map.size + (new - old) >
td->td_proc->p_rlimit[RLIMIT_VMEM].rlim_cur) {
error = ENOMEM;
goto done;
}
rv = vm_map_insert(&vm->vm_map, NULL, 0, old, new,
VM_PROT_ALL, VM_PROT_ALL, 0);
if (rv != KERN_SUCCESS) {