Date: Mon, 17 Oct 2011 05:42:53 +0000 (UTC) From: "Jayachandran C." <jchandra@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r226459 - head/sys/mips/mips Message-ID: <201110170542.p9H5gro3097024@svn.freebsd.org>
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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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