Date: Mon, 31 Oct 2016 07:21:07 +0000 (UTC) From: Alexander Motin <mav@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r308122 - stable/11/sys/cam/scsi Message-ID: <201610310721.u9V7L7Lg061476@repo.freebsd.org>
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Author: mav Date: Mon Oct 31 07:21:07 2016 New Revision: 308122 URL: https://svnweb.freebsd.org/changeset/base/308122 Log: MFC r307523: Make pass driver better support CAM_CDB_POINTER flag. Previously pass driver just ignored the flag, making random kernel code access user-space pointer, sometime causing crashes even for correctly written applications if user-level context was switched or swapped out. This patch tries to copyin the CDB into kernel space to avoid it. Modified: stable/11/sys/cam/scsi/scsi_pass.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/cam/scsi/scsi_pass.c ============================================================================== --- stable/11/sys/cam/scsi/scsi_pass.c Mon Oct 31 05:58:11 2016 (r308121) +++ stable/11/sys/cam/scsi/scsi_pass.c Mon Oct 31 07:21:07 2016 (r308122) @@ -1876,6 +1876,18 @@ passdoioctl(struct cdev *dev, u_long cmd break; } + if (ccb->ccb_h.flags & CAM_CDB_POINTER) { + if (ccb->csio.cdb_len > IOCDBLEN) { + error = EINVAL; + break; + } + error = copyin(ccb->csio.cdb_io.cdb_ptr, + ccb->csio.cdb_io.cdb_bytes, ccb->csio.cdb_len); + if (error) + break; + ccb->ccb_h.flags &= ~CAM_CDB_POINTER; + } + /* * Some CCB types, like scan bus and scan lun can only go * through the transport layer device. @@ -2143,6 +2155,7 @@ passsendccb(struct cam_periph *periph, u { struct pass_softc *softc; struct cam_periph_map_info mapinfo; + uint8_t *cmd; xpt_opcode fc; int error; @@ -2154,6 +2167,14 @@ passsendccb(struct cam_periph *periph, u */ xpt_merge_ccb(ccb, inccb); + if (ccb->ccb_h.flags & CAM_CDB_POINTER) { + cmd = __builtin_alloca(ccb->csio.cdb_len); + error = copyin(ccb->csio.cdb_io.cdb_ptr, cmd, ccb->csio.cdb_len); + if (error) + return (error); + ccb->csio.cdb_io.cdb_ptr = cmd; + } + /* */ ccb->ccb_h.cbfcnp = passdone;
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