Date: Thu, 2 Feb 2017 23:04:06 +0000 (UTC) From: Warner Losh <imp@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r313113 - head/sys/dev/nvme Message-ID: <201702022304.v12N460i035525@repo.freebsd.org>
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Author: imp Date: Thu Feb 2 23:04:06 2017 New Revision: 313113 URL: https://svnweb.freebsd.org/changeset/base/313113 Log: Ensure that the passthrough request will fit in MAXPHYS bytes after it has been rounded to full pages. This avoids a panic in vm_fault_quick_hold_pages due to this off-by-one error passing one page too many into vmapbuf. Modified: head/sys/dev/nvme/nvme_ctrlr.c Modified: head/sys/dev/nvme/nvme_ctrlr.c ============================================================================== --- head/sys/dev/nvme/nvme_ctrlr.c Thu Feb 2 23:04:01 2017 (r313112) +++ head/sys/dev/nvme/nvme_ctrlr.c Thu Feb 2 23:04:06 2017 (r313113) @@ -874,8 +874,20 @@ nvme_ctrlr_passthrough_cmd(struct nvme_c struct mtx *mtx; struct buf *buf = NULL; int ret = 0; + vm_offset_t addr, end; if (pt->len > 0) { + /* + * vmapbuf calls vm_fault_quick_hold_pages which only maps full + * pages. Ensure this request has fewer than MAXPHYS bytes when + * extended to full pages. + */ + addr = (vm_offset_t)pt->buf; + end = round_page(addr + pt->len); + addr = trunc_page(addr); + if (end - addr > MAXPHYS) + return EIO; + if (pt->len > ctrlr->max_xfer_size) { nvme_printf(ctrlr, "pt->len (%d) " "exceeds max_xfer_size (%d)\n", pt->len,
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