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- uvm_fork()/uvm_swapin(): pass VM_PROT_READ|VM_PROT_WRITE access_type

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to uvm_fault_wire(), to guarantee that the kernel stacks will not
  cause even a mod/ref emulation fault.
- uvm_vslock(): pass VM_PROT_NONE until this function is updated.
This commit is contained in:
thorpej 1999-05-26 00:33:52 +00:00
parent 195c1a2741
commit 9d0ea0969e
1 changed files with 10 additions and 4 deletions
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14
sys/uvm/uvm_glue.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_glue.c,v 1.20 1999/05/13 21:58:38 thorpej Exp $ */
/* $NetBSD: uvm_glue.c,v 1.21 1999/05/26 00:33:52 thorpej Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -229,8 +229,10 @@ uvm_vslock(p, addr, len)
caddr_t addr;
size_t len;
{
/* XXX VM_PROT_NONE */
uvm_fault_wire(&p->p_vmspace->vm_map, trunc_page(addr),
round_page(addr+len));
round_page(addr+len), VM_PROT_NONE);
}
/*
@ -285,9 +287,12 @@ uvm_fork(p1, p2, shared, stack, stacksize)
* and the kernel stack. Wired state is stored in p->p_flag's
* P_INMEM bit rather than in the vm_map_entry's wired count
* to prevent kernel_map fragmentation.
*
* Note the kernel stack gets read/write accesses right off
* the bat.
*/
rv = uvm_fault_wire(kernel_map, (vaddr_t)up,
(vaddr_t)up + USPACE);
(vaddr_t)up + USPACE, VM_PROT_READ | VM_PROT_WRITE);
if (rv != KERN_SUCCESS)
panic("uvm_fork: uvm_fault_wire failed: %d", rv);
@ -373,7 +378,8 @@ uvm_swapin(p)
addr = (vaddr_t)p->p_addr;
/* make P_INMEM true */
uvm_fault_wire(kernel_map, addr, addr + USPACE);
uvm_fault_wire(kernel_map, addr, addr + USPACE,
VM_PROT_READ | VM_PROT_WRITE);
/*
* Some architectures need to be notified when the user area has