diff options
| author | Laszlo Ersek <lersek@redhat.com> | 2013-11-02 20:14:21 +0100 |
|---|---|---|
| committer | Michael Roth <mdroth@linux.vnet.ibm.com> | 2013-12-09 14:49:49 -0600 |
| commit | 192d2f4cc7931668d4e4f10e882af3c097193c47 (patch) | |
| tree | a03e4072035e31d30eaca59415de7e1b39083023 | |
| parent | 9388fdb603e69d1c251f9bdfaac575ad3258583a (diff) | |
| download | qemu-192d2f4cc7931668d4e4f10e882af3c097193c47.tar.gz | |
scsi_target_send_command(): amend stable-1.6 port of the CVE-2013-4344 fix
The originally suggested fix for CVE-2013-4344 introduced a regression in
scsi_target_send_command() / REQUEST_SENSE; the third argument passed to
scsi_device_get_sense() -- for the "len" parameter -- ignored the
possibility of the guest SCSI driver requesting truncated (or shorter than
full) sense data.
This could result in (r->len > req->cmd.xfer) on return, which is not
valid SCSI.
The problem was addressed in the second round, and the commit on the
master branch (84642435) is correct. However the stable-1.6 branch (the
v1.6.1 release) has the original, regressive fix (commit fdcbe7d5); let's
update it.
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
| -rw-r--r-- | hw/scsi/scsi-bus.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/hw/scsi/scsi-bus.c b/hw/scsi/scsi-bus.c index ad26c252ee..d352da7020 100644 --- a/hw/scsi/scsi-bus.c +++ b/hw/scsi/scsi-bus.c @@ -460,7 +460,8 @@ static int32_t scsi_target_send_command(SCSIRequest *req, uint8_t *buf) break; case REQUEST_SENSE: scsi_target_alloc_buf(&r->req, SCSI_SENSE_LEN); - r->len = scsi_device_get_sense(r->req.dev, r->buf, r->buf_len, + r->len = scsi_device_get_sense(r->req.dev, r->buf, + MIN(req->cmd.xfer, r->buf_len), (req->cmd.buf[1] & 1) == 0); if (r->req.dev->sense_is_ua) { scsi_device_unit_attention_reported(req->dev); |