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Lock object while we iterate through it's backing objects.

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Discussed with:	alc
This commit is contained in:
Christian S.J. Peron 2005-10-09 02:37:27 +00:00
parent cd604283af
commit a5b7fde722
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=151115
1 changed files with 7 additions and 6 deletions
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13
sys/security/mac/mac_process.c
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@ -327,7 +327,7 @@ mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
struct vm_map_entry *vme;
int vfslocked, result;
vm_prot_t revokeperms;
vm_object_t object;
vm_object_t backing_object, object;
vm_ooffset_t offset;
struct vnode *vp;
@ -354,13 +354,14 @@ mac_cred_mmapped_drop_perms_recurse(struct thread *td, struct ucred *cred,
object = vme->object.vm_object;
if (object == NULL)
continue;
/* XXXCSJP We need to lock the object before walking
* the backing object list.
*/
while (object->backing_object != NULL) {
VM_OBJECT_LOCK(object);
while ((backing_object = object->backing_object) != NULL) {
VM_OBJECT_LOCK(backing_object);
offset += object->backing_object_offset;
object = object->backing_object;
VM_OBJECT_UNLOCK(object);
object = backing_object;
}
VM_OBJECT_UNLOCK(object);
/*
* At the moment, vm_maps and objects aren't considered
* by the MAC system, so only things with backing by a