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vm: allow readonly pages when sanity checking when they're supposed to be rw.

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This commit is contained in:
Ben Gras 2010-07-19 18:19:16 +00:00
parent e0701109ca
commit 5e2c84b119
1 changed files with 4 additions and 0 deletions
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4
servers/vm/arch/i386/pagetable.c
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@ -581,6 +581,10 @@ PUBLIC int pt_writemap(pt_t *pt, vir_bytes v, phys_bytes physaddr,
maskedentry = pt->pt_pt[pde][pte];
maskedentry &= ~(I386_VM_ACC|I386_VM_DIRTY);
/* Verify pagetable entry. */
if(entry & I386_VM_WRITE) {
/* If we expect a writable page, allow a readonly page. */
maskedentry |= I386_VM_WRITE;
}
if(maskedentry != entry) {
printf("pt_writemap: mismatch: ");
if((entry & I386_VM_ADDR_MASK) !=