Attachment 167570 Details for Bug 204426 – Debugging patch to track source of KERN_PROTECTION_FAILURE

[patch] Debugging patch to track source of KERN_PROTECTION_FAILURE

1.patch (text/plain), 2.23 KB, created by Konstantin Belousov on 2016-02-29 15:16:04 UTC

(hide)

Description:

Filename:

MIME Type:

Creator: Konstantin Belousov

Created: 2016-02-29 15:16:04 UTC

Size: 2.23 KB

patch

obsolete

>diff --git a/sys/vm/vm_fault.c b/sys/vm/vm_fault.c
>index cddf1eb..01f3d39 100644
>--- a/sys/vm/vm_fault.c
>+++ b/sys/vm/vm_fault.c
>@@ -263,6 +263,7 @@ vm_fault(vm_map_t map, vm_offset_t vaddr, vm_prot_t fault_type,
> 	int result;
> 
> 	td = curthread;
>+if ((td->td_pflags & TDP_NOFAULTING) != 0) printf("pid %d kpf 1\n", curproc->p_pid);
> 	if ((td->td_pflags & TDP_NOFAULTING) != 0)
> 		return (KERN_PROTECTION_FAILURE);
> #ifdef KTRACE
>@@ -425,6 +426,7 @@ fast_failed:
> 		 */
> 		if (fs.object->flags & OBJ_DEAD) {
> 			unlock_and_deallocate(&fs);
>+printf("pid %d kpf 2\n", curproc->p_pid);
> 			return (KERN_PROTECTION_FAILURE);
> 		}
> 
>@@ -506,6 +508,7 @@ fast_failed:
> 		    fs.object == fs.first_object) {
> 			if (fs.pindex >= fs.object->size) {
> 				unlock_and_deallocate(&fs);
>+printf("pid %d kpf 3 %jd %jd\n", curproc->p_pid, (uintmax_t)fs.pindex, (uintmax_t)fs.object->size);
> 				return (KERN_PROTECTION_FAILURE);
> 			}
> 
>@@ -698,6 +701,7 @@ vnode_locked:
> 				vm_page_unlock(fs.m);
> 				fs.m = NULL;
> 				unlock_and_deallocate(&fs);
>+if (rv != VM_PAGER_ERROR) printf("pid %d kpf 4\n", curproc->p_pid);
> 				return ((rv == VM_PAGER_ERROR) ? KERN_FAILURE : KERN_PROTECTION_FAILURE);
> 			}
> 			if (fs.object != fs.first_object) {
>diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c
>index 5e22b3e..deecc3a 100644
>--- a/sys/vm/vm_map.c
>+++ b/sys/vm/vm_map.c
>@@ -4011,6 +4011,7 @@ RetryLookup:;
> 	prot = entry->protection;
> 	fault_type &= (VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
> 	if ((fault_type & prot) != fault_type || prot == VM_PROT_NONE) {
>+printf("pid %d kpf 5 %x %x\n", curproc->p_pid, fault_type, prot);
> 		vm_map_unlock_read(map);
> 		return (KERN_PROTECTION_FAILURE);
> 	}
>@@ -4022,6 +4023,7 @@ RetryLookup:;
> 	    (entry->max_protection & VM_PROT_WRITE) == 0 &&
> 	    (entry->eflags & MAP_ENTRY_COW) == 0) {
> 		vm_map_unlock_read(map);
>+printf("pid %d kpf 6\n", curproc->p_pid);
> 		return (KERN_PROTECTION_FAILURE);
> 	}
> 
>@@ -4169,6 +4171,7 @@ vm_map_lookup_locked(vm_map_t *var_map,		/* IN/OUT */
> 	 */
> 	prot = entry->protection;
> 	fault_type &= VM_PROT_READ | VM_PROT_WRITE | VM_PROT_EXECUTE;
>+if ((fault_type & prot) != fault_type) printf("pid %d kpf 7 %x %x\n", curproc->p_pid, fault_type, prot);
> 	if ((fault_type & prot) != fault_type)
> 		return (KERN_PROTECTION_FAILURE);
>

Actions: View | Diff

Attachments on bug 204426: 167570 | 168808 | 168832 | 168870 | 168872 | 169679