The bdrv layer uses a signed offset. Furthermore, block-raw-posix
only seeks when that offset is positive. Passing a negative offset
to block-raw-posix can result in data being written at the current
seek cursor's position.
It may be possible to exploit this to seek to the end of the disk
and extend the virtual disk by writing data to a negative sector
offset. After a reboot, this could lead to the guest having a
larger disk than it had before.
Close the hole by sanity checking the lba against the size of the
disk.
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6475 c046a42c-6fe2-441c-8c8c-71466251a162
Paul Brook pointed out that the number of sectors reported
by the SCSI read capacity commands needs to be divided by
s->cluster_size, because bdrv_get_geometry reports the number
of 512 byte sectors, while emulated CDROMs report 2048 byte
sectors back to the guest.
This has no consequences for emulated hard disks, which use
a cluster size of 1.
aliguori: fixed typo
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6469 c046a42c-6fe2-441c-8c8c-71466251a162
Implement SCSI READ(16), WRITE(16) and SAI READ CAPACITY(16) commands,
so SCSI disks larger than 2TB can work with guests that support these
newer SCSI commands.
The cast to (uint64_t) is needed because otherwise gcc will use a
signed int, which gets sign extended into uint64_t lba, resulting
in bad block numbers for READ 10 and READ 16 with block numbers
larger than 2^31.
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6468 c046a42c-6fe2-441c-8c8c-71466251a162
Sector numbers can overflow on a virtual scsi disk of over 1TB
in size. Qemu's bdrv_read expects an int64_t, so fix the overflow
by going to that data type.
On large disks, we clip the capacity to 2TB instead of returning
"capacity modulo 2TB".
Turn sector_count into an unsigned to prevent a signed/unsigned
overflow with SCSI transfers larger than 2TB. We're unlikely to
ever hit this bug, but fixing it is just one line.
Signed-off-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6467 c046a42c-6fe2-441c-8c8c-71466251a162
Windows calculates HW "uniqueness" based on a hard drive serial number
among other things. The patch allows to specify drive serial number
from a command line.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6214 c046a42c-6fe2-441c-8c8c-71466251a162
Openserver 5.0.5 sends an Inquiry command to the emulated SCSI disk
expecting a response length of 40 bytes. Currently the response to an
Inquiry command is hardcoded to 36 bytes. When receiving a response of
length 36 instead of 40 Openserver panics.
Modifications to original patch based on feedback from Ryan Harper and Paul
Brook. Thanks guys.
Signed-off-by: Justin Chevrier <address@hidden>
Signed-off-by: Andrzej Zaborowski <andrew.zaborowski@intel.com>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5903 c046a42c-6fe2-441c-8c8c-71466251a162
taken from Xen 17267:f4a92f0db20f, original patch by Samuel Thibault.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5385 c046a42c-6fe2-441c-8c8c-71466251a162
aliguori