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Code Issues Releases Activity

When forking a vm space that has wired map entries, do not forget to

Browse Source 
charge the objects created by vm_fault_copy_entry. The object charge
was set, but reserve not incremented.

Reported by:	Greg Rivers <gcr+freebsd-current tharned org>
Reviewed by:	alc (previous version)
Approved by:	re (kensmith)
This commit is contained in:
Konstantin Belousov 2009-07-03 22:17:37 +00:00
parent 9e760f2578
commit 121fd46175
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=195329
3 changed files with 16 additions and 12 deletions
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3
sys/vm/vm_extern.h
View File

@ -55,7 +55,8 @@ vm_map_t kmem_suballoc(vm_map_t, vm_offset_t *, vm_offset_t *, vm_size_t,
void swapout_procs(int);
int useracc(void *, int, int);
int vm_fault(vm_map_t, vm_offset_t, vm_prot_t, int);
void vm_fault_copy_entry(vm_map_t, vm_map_t, vm_map_entry_t, vm_map_entry_t);
void vm_fault_copy_entry(vm_map_t, vm_map_t, vm_map_entry_t, vm_map_entry_t,
vm_ooffset_t *);
void vm_fault_unwire(vm_map_t, vm_offset_t, vm_offset_t, boolean_t);
int vm_fault_wire(vm_map_t, vm_offset_t, vm_offset_t, boolean_t, boolean_t);
int vm_forkproc(struct thread *, struct proc *, struct thread *, struct vmspace *, int);

21
sys/vm/vm_fault.c
View File

@ -1126,11 +1126,9 @@ vm_fault_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
* entry corresponding to a main map entry that is wired down).
*/
void
vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry)
vm_map_t dst_map;
vm_map_t src_map;
vm_map_entry_t dst_entry;
vm_map_entry_t src_entry;
vm_fault_copy_entry(vm_map_t dst_map, vm_map_t src_map,
vm_map_entry_t dst_entry, vm_map_entry_t src_entry,
vm_ooffset_t *fork_charge)
{
vm_object_t backing_object, dst_object, object;
vm_object_t src_object;
@ -1161,13 +1159,16 @@ vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry)
#endif
VM_OBJECT_LOCK(dst_object);
KASSERT(dst_entry->object.vm_object == NULL,
("vm_fault_copy_entry: vm_object not NULL"));
dst_entry->object.vm_object = dst_object;
dst_entry->offset = 0;
if (dst_entry->uip != NULL) {
dst_object->uip = dst_entry->uip;
dst_object->charge = dst_entry->end - dst_entry->start;
dst_entry->uip = NULL;
}
dst_object->uip = curthread->td_ucred->cr_ruidinfo;
uihold(dst_object->uip);
dst_object->charge = dst_entry->end - dst_entry->start;
KASSERT(dst_entry->uip == NULL,
("vm_fault_copy_entry: leaked swp charge"));
*fork_charge += dst_object->charge;
prot = dst_entry->max_protection;
/*

4
sys/vm/vm_map.c
View File

@ -2909,7 +2909,8 @@ vm_map_copy_entry(
* Cause wired pages to be copied into the new map by
* simulating faults (the new pages are pageable)
*/
vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry);
vm_fault_copy_entry(dst_map, src_map, dst_entry, src_entry,
fork_charge);
}
}
@ -3073,6 +3074,7 @@ vmspace_fork(struct vmspace *vm1, vm_ooffset_t *fork_charge)
MAP_ENTRY_IN_TRANSITION);
new_entry->wired_count = 0;
new_entry->object.vm_object = NULL;
new_entry->uip = NULL;
vm_map_entry_link(new_map, new_map->header.prev,
new_entry);
vmspace_map_entry_forked(vm1, vm2, new_entry);