Author: jchandra
Date: Mon Oct 17 05:42:53 2011
New Revision: 226459
URL: http://svn.freebsd.org/changeset/base/226459
Log:
Fix for crash on MIPS /dev/mem read.
Reading /dev/mem in 64 bit kernel crashes. This is because the page
used to call uiomove_fromphys() from memrw() does not have md.pv_list
initialized correctly.
The fix is to call pmap_page_init() on the page to initialize it.
Modified:
head/sys/mips/mips/mem.c
Modified: head/sys/mips/mips/mem.c
==============================================================================
--- head/sys/mips/mips/mem.c Mon Oct 17 05:41:03 2011 (r226458)
+++ head/sys/mips/mips/mem.c Mon Oct 17 05:42:53 2011 (r226459)
@@ -87,6 +87,7 @@ memrw(struct cdev *dev, struct uio *uio,
GIANT_REQUIRED;
+ pmap_page_init(&m);
while (uio->uio_resid > 0 && !error) {
iov = uio->uio_iov;
if (iov->iov_len == 0) {
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