Fix bug in pipe code relating to writes of mmap'd but illegal address

    spaces which cross a segment boundry in the page table.  pmap_kextract()
    is not designed for access to the user space portion of the page
    table and cannot handle the null-page-directory-entry case.

    The fix is to have vm_fault_quick() return a success or failure which
    is then used to avoid calling pmap_kextract().

2 files changed, 10 insertions, 6 deletions

diff --git a/sys/powerpc/aim/vm_machdep.c b/sys/powerpc/aim/vm_machdep.c
index 2f0dabb..a77458c 100644
--- a/sys/powerpc/aim/vm_machdep.c
+++ b/sys/powerpc/aim/vm_machdep.c
@@ -97,15 +97,17 @@
 /*
  * quick version of vm_fault
  */
-void
+int
 vm_fault_quick(v, prot)
 	caddr_t v;
 	int prot;
 {
+	int r;
 	if (prot & VM_PROT_WRITE)
-		subyte(v, fubyte(v));
+		r = subyte(v, fubyte(v));
 	else
-		fubyte(v);
+		r = fubyte(v);
+	return(r);
 }
 
 /*
diff --git a/sys/powerpc/powerpc/vm_machdep.c b/sys/powerpc/powerpc/vm_machdep.c
index 2f0dabb..a77458c 100644
--- a/sys/powerpc/powerpc/vm_machdep.c
+++ b/sys/powerpc/powerpc/vm_machdep.c
@@ -97,15 +97,17 @@
 /*
  * quick version of vm_fault
  */
-void
+int
 vm_fault_quick(v, prot)
 	caddr_t v;
 	int prot;
 {
+	int r;
 	if (prot & VM_PROT_WRITE)
-		subyte(v, fubyte(v));
+		r = subyte(v, fubyte(v));
 	else
-		fubyte(v);
+		r = fubyte(v);
+	return(r);
 }
 
 /*