vmspace_fork(): do not override offset for the guard entries

The offset field contains protection for the stack guards.

Reported by:	cy
Fixes:	21e45c30c3
MFC after:	1 week

This commit is contained in:

Konstantin Belousov

2023-07-20 20:45:01 +03:00

parent a29916a6f8

commit db6c7c7f8d

1 changed files with 2 additions and 1 deletions

									
										sys/vm/vm_map.c
									
		+2
		-1
	
												View File
												
				@@ -4181,7 +4181,8 @@ vm_map_copy_entry(

							    src_entry->start);

						} else {

							dst_entry->object.vm_object = NULL;

							dst_entry->offset = 0;

							if ((dst_entry->eflags & MAP_ENTRY_GUARD) == 0)

								dst_entry->offset = 0;

							if (src_entry->cred != NULL) {

								dst_entry->cred = curthread->td_ucred;

								crhold(dst_entry->cred);