Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Change kmem access check to match the actual kva layout.

Browse Source
This commit is contained in:
fvdl 2002-06-05 21:58:30 +00:00
parent 46f68cda83
commit 1c3269bdc6
1 changed files with 11 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
sys/arch/x86_64/x86_64/mem.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: mem.c,v 1.2 2002/02/27 01:20:56 christos Exp $ */
/* $NetBSD: mem.c,v 1.3 2002/06/05 21:58:30 fvdl Exp $ */
/*
* Copyright (c) 1988 University of Utah.
@ -61,6 +61,7 @@
extern char *vmmap; /* poor name! */
caddr_t zeropage;
extern int start, end, etext;
/*ARGSUSED*/
int
@ -136,9 +137,15 @@ mmrw(dev, uio, flags)
case DEV_KMEM:
v = uio->uio_offset;
c = min(iov->iov_len, MAXPHYS);
if (!uvm_kernacc((caddr_t)v, c,
uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
return (EFAULT);
if (v >= (vaddr_t)&start && (v + c) < (vaddr_t)&end) {
if (v < (vaddr_t)&etext &&
uio->uio_rw == UIO_WRITE)
return EFAULT;
} else {
if (!uvm_kernacc((caddr_t)v, c,
uio->uio_rw == UIO_READ ? B_READ : B_WRITE))
return EFAULT;
}
error = uiomove((caddr_t)v, c, uio);
break;