HBSD MFC r333405: Remove PG_U from the rest of the kernel pmap ptes.

Supposedly, they PG_U bits there were set to easier making some kernel page accessible to userspace in-place. Since it was not used for the whole existence of the amd64 pmap.c and current design of the shared pages prefers double-mapping over the in-place access, remove PG_U both from the direct map and KVA slots. Reviewed by: alc, markj Sponsored by: The FreeBSD Foundation MFC after: 1 week (cherry picked from commit 98f7017) Author: kib <[email protected]> Original-commit-date: Wed May 9 12:09:08 2018 +0000 svn-commit-id: /head/ r333405 Signed-off-by: Oliver Pinter <[email protected]>
HardenedBSD · Aug 7, 2018 · 6840ef5 · 6840ef5
1 parent badc1af
commit 6840ef5
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
@@ -1063,7 +1063,7 @@ create_pagetables(vm_paddr_t *firstaddr)
 			    bootaddr_rwx(i << PDRSHIFT);
 		for (i = 0; i < nkdmpde; i++)
 			pdp_p[i] = (DMPDkernphys + ptoa(i)) | X86_PG_RW |
-			    X86_PG_V | PG_U;
+			    X86_PG_V;
 	}
 
 	/* And recursively map PML4 to itself in order to get PTmap */