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Reject userland CCBs that have CAM_UNLOCKED set.

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CAM_UNLOCKED is internal flag and cannot correctly be set by userland.
Return EINVAL from CAMIOCOMMAND and CAMIOQUEUE if it is set.

Also fix leaks in some of the error paths for CAMIOQUEUE.

PR:		215356
Reviewed by:	ken, mav
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D9869
This commit is contained in:
Mark Johnston 2017-03-03 20:51:57 +00:00
parent 8ff15e8613
commit a0bbf9e0e3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=314624
2 changed files with 25 additions and 14 deletions
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3
sys/cam/cam_xpt.c
View File

@ -435,6 +435,9 @@ xptdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread *
inccb->csio.bio = NULL;
#endif
if (inccb->ccb_h.flags & CAM_UNLOCKED)
return (EINVAL);
bus = xpt_find_bus(inccb->ccb_h.path_id);
if (bus == NULL)
return (EINVAL);

36
sys/cam/scsi/scsi_pass.c
View File

@ -1782,6 +1782,11 @@ passdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread
inccb->csio.bio = NULL;
#endif
if (inccb->ccb_h.flags & CAM_UNLOCKED) {
error = EINVAL;
break;
}
/*
* Some CCB types, like scan bus and scan lun can only go
* through the transport layer device.
@ -1875,24 +1880,27 @@ passdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread
xpt_print(periph->path, "Copy of user CCB %p to "
"kernel address %p failed with error %d\n",
*user_ccb, ccb, error);
uma_zfree(softc->pass_zone, io_req);
cam_periph_lock(periph);
break;
goto camioqueue_error;
}
#if defined(BUF_TRACKING) || defined(FULL_BUF_TRACKING)
if (ccb->ccb_h.func_code == XPT_SCSI_IO)
ccb->csio.bio = NULL;
#endif
if (ccb->ccb_h.flags & CAM_UNLOCKED) {
error = EINVAL;
goto camioqueue_error;
}
if (ccb->ccb_h.flags & CAM_CDB_POINTER) {
if (ccb->csio.cdb_len > IOCDBLEN) {
error = EINVAL;
break;
goto camioqueue_error;
}
error = copyin(ccb->csio.cdb_io.cdb_ptr,
ccb->csio.cdb_io.cdb_bytes, ccb->csio.cdb_len);
if (error)
break;
if (error != 0)
goto camioqueue_error;
ccb->ccb_h.flags &= ~CAM_CDB_POINTER;
}
@ -1904,10 +1912,8 @@ passdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread
xpt_print(periph->path, "CCB function code %#x is "
"restricted to the XPT device\n",
ccb->ccb_h.func_code);
uma_zfree(softc->pass_zone, io_req);
cam_periph_lock(periph);
error = ENODEV;
break;
goto camioqueue_error;
}
/*
@ -1953,11 +1959,8 @@ passdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread
|| (fc == XPT_SMP_IO) || (fc == XPT_DEV_MATCH)
|| (fc == XPT_DEV_ADVINFO)) {
error = passmemsetup(periph, io_req);
if (error != 0) {
uma_zfree(softc->pass_zone, io_req);
cam_periph_lock(periph);
break;
}
if (error != 0)
goto camioqueue_error;
} else
io_req->mapinfo.num_bufs_used = 0;
@ -2002,6 +2005,11 @@ passdoioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flag, struct thread
TAILQ_INSERT_TAIL(&softc->done_queue, io_req, links);
}
break;
camioqueue_error:
uma_zfree(softc->pass_zone, io_req);
cam_periph_lock(periph);
break;
}
case CAMIOGET:
{