[Xen-devel] [PATCH V2] libxl: relax readonly check introduced by XSA-142 fix

[Jim Fehlig <jfehlig@xxxxxxxx>]

The fix for XSA-142 is quite a big hammer, rejecting readonly
disk configuration even when the requested backend is known to
support readonly. While it is true that qemu doesn't support
readonly for emulated IDE or AHCI disks

$ /usr/lib/xen/bin/qemu-system-i386 \
 -drive file=/tmp/disk.raw,if=ide,media=disk,format=raw,readonly=on
qemu-system-i386: Can't use a read-only drive

$ /usr/lib/xen/bin/qemu-system-i386 -device ahci,id=ahci0 \
 -drive file=/tmp/disk.raw,if=none,id=ahcidisk-0,format=raw,readonly=on \
 -device ide-hd,bus=ahci0.0,unit=0,drive=ahcidisk-0
qemu-system-i386: -device ide-hd,bus=ahci0.0,unit=0,drive=ahcidisk-0:
Can't use a read-only drive

It does support readonly SCSI disks

$ /usr/lib/xen/bin/qemu-system-i386 \
 -drive file=/tmp/disk.raw,if=scsi,media=disk,format=raw,readonly=on
[ok]

Inside a guest using such a disk, the SCSI kernel driver sees write
protect on

[   7.339232] sd 2:0:1:0: [sdb] Write Protect is on

Also, PV drivers support readonly, but the patch rejects such
configuration even when PV drivers (vdev=xvd*) have been explicitly
specified and creation of an emulated twin is skiped.

This follow-up patch loosens the restriction to reject readonly when
creating and emulated IDE or AHCI disk, but allows it when the backend
is known to support readonly.

Signed-off-by: Jim Fehlig <jfehlig@xxxxxxxx>
---

V2: Along with IDE+readonly, blacklist AHCI+readonly since it is not
    supported by qemu either.

 tools/libxl/libxl_dm.c | 29 ++++++++++++++++-------------
 1 file changed, 16 insertions(+), 13 deletions(-)

diff --git a/tools/libxl/libxl_dm.c b/tools/libxl/libxl_dm.c
index 9c9eaa3..cb6deec 100644
--- a/tools/libxl/libxl_dm.c
+++ b/tools/libxl/libxl_dm.c
@@ -1152,12 +1152,6 @@ static int libxl__build_device_model_args_new(libxl__gc 
*gc,
                         (gc, 
"file=%s,if=ide,index=%d,readonly=%s,media=cdrom,format=%s,cache=writeback,id=ide-%i",
                          disks[i].pdev_path, disk, disks[i].readwrite ? "off" 
: "on", format, dev_number);
             } else {
-                if (!disks[i].readwrite) {
-                    LOG(ERROR,
-                        "qemu-xen doesn't support read-only disk drivers");
-                    return ERROR_INVAL;
-                }
-
                 if (disks[i].format == LIBXL_DISK_FORMAT_EMPTY) {
                     LOG(WARN, "cannot support"" empty disk format for %s",
                         disks[i].vdev);
@@ -1185,29 +1179,38 @@ static int libxl__build_device_model_args_new(libxl__gc 
*gc,
                  * For other disks we translate devices 0..3 into
                  * hd[a-d] and ignore the rest.
                  */
-                if (strncmp(disks[i].vdev, "sd", 2) == 0)
+                if (strncmp(disks[i].vdev, "sd", 2) == 0) {
                     drive = libxl__sprintf
-                        (gc, 
"file=%s,if=scsi,bus=0,unit=%d,format=%s,cache=writeback",
-                         pdev_path, disk, format);
-                else if (strncmp(disks[i].vdev, "xvd", 3) == 0)
+                        (gc, 
"file=%s,if=scsi,bus=0,unit=%d,format=%s,readonly=%s,cache=writeback",
+                         pdev_path, disk, format, disks[i].readwrite ? "off" : 
"on");
+                } else if (strncmp(disks[i].vdev, "xvd", 3) == 0) {
                     /*
                      * Do not add any emulated disk when PV disk are
                      * explicitly asked for.
                      */
                     continue;
-                else if (disk < 6 && b_info->u.hvm.hdtype == 
LIBXL_HDTYPE_AHCI) {
+                } else if (disk < 6 && b_info->u.hvm.hdtype == 
LIBXL_HDTYPE_AHCI) {
+                    if (!disks[i].readwrite) {
+                        LOG(ERROR, "qemu-xen doesn't support read-only AHCI 
disk drivers");
+                        return ERROR_INVAL;
+                    }
                     flexarray_vappend(dm_args, "-drive",
                         
GCSPRINTF("file=%s,if=none,id=ahcidisk-%d,format=%s,cache=writeback",
                         pdev_path, disk, format),
                         "-device", 
GCSPRINTF("ide-hd,bus=ahci0.%d,unit=0,drive=ahcidisk-%d",
                         disk, disk), NULL);
                     continue;
-                } else if (disk < 4)
+                } else if (disk < 4) {
+                    if (!disks[i].readwrite) {
+                        LOG(ERROR, "qemu-xen doesn't support read-only IDE 
disk drivers");
+                        return ERROR_INVAL;
+                    }
                     drive = libxl__sprintf
                         (gc, 
"file=%s,if=ide,index=%d,media=disk,format=%s,cache=writeback",
                          pdev_path, disk, format);
-                else
+                } else {
                     continue; /* Do not emulate this disk */
+                }
             }
 
             flexarray_append(dm_args, "-drive");
-- 
1.8.0.1


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel