* [Qemu-devel] [PATCH v2] sd: limit 'req.cmd' while using as an array index
@ 2016-01-20 18:50 P J P
2016-01-25 11:51 ` Peter Maydell
2016-02-09 17:04 ` Peter Maydell
0 siblings, 2 replies; 3+ messages in thread
From: P J P @ 2016-01-20 18:50 UTC (permalink / raw)
To: qemu-devel; +Cc: Qinghao Tang, Peter Maydell, Prasad J Pandit
From: Prasad J Pandit <pjp@fedoraproject.org>
While processing standard SD commands, the 'req.cmd' value could
lead to OOB read when used as an index into 'sd_cmd_type' or
'sd_cmd_class' arrays. Limit 'req.cmd' value to avoid such an
access.
Reported-by: Qinghao Tang <luodalongde@gmail.com>
Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
---
hw/sd/sd.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
Update as per review:
-> https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg03769.html
diff --git a/hw/sd/sd.c b/hw/sd/sd.c
index 1a9935c..5ee3e54 100644
--- a/hw/sd/sd.c
+++ b/hw/sd/sd.c
@@ -668,8 +668,10 @@ static sd_rsp_type_t sd_normal_command(SDState *sd,
/* Not interpreting this as an app command */
sd->card_status &= ~APP_CMD;
- if (sd_cmd_type[req.cmd] == sd_ac || sd_cmd_type[req.cmd] == sd_adtc)
+ if (sd_cmd_type[req.cmd & 0x3F] == sd_ac
+ || sd_cmd_type[req.cmd & 0x3F] == sd_adtc) {
rca = req.arg >> 16;
+ }
DPRINTF("CMD%d 0x%08x state %d\n", req.cmd, req.arg, sd->state);
switch (req.cmd) {
@@ -1340,7 +1342,8 @@ static int cmd_valid_while_locked(SDState *sd, SDRequest *req)
if (req->cmd == 16 || req->cmd == 55) {
return 1;
}
- return sd_cmd_class[req->cmd] == 0 || sd_cmd_class[req->cmd] == 7;
+ return sd_cmd_class[req->cmd & 0x3F] == 0
+ || sd_cmd_class[req->cmd & 0x3F] == 7;
}
int sd_do_command(SDState *sd, SDRequest *req,
--
2.5.0
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PATCH v2] sd: limit 'req.cmd' while using as an array index
2016-01-20 18:50 [Qemu-devel] [PATCH v2] sd: limit 'req.cmd' while using as an array index P J P
@ 2016-01-25 11:51 ` Peter Maydell
2016-02-09 17:04 ` Peter Maydell
1 sibling, 0 replies; 3+ messages in thread
From: Peter Maydell @ 2016-01-25 11:51 UTC (permalink / raw)
To: P J P; +Cc: Qinghao Tang, QEMU Developers, Prasad J Pandit
On 20 January 2016 at 18:50, P J P <ppandit@redhat.com> wrote:
> From: Prasad J Pandit <pjp@fedoraproject.org>
>
> While processing standard SD commands, the 'req.cmd' value could
> lead to OOB read when used as an index into 'sd_cmd_type' or
> 'sd_cmd_class' arrays. Limit 'req.cmd' value to avoid such an
> access.
>
> Reported-by: Qinghao Tang <luodalongde@gmail.com>
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
> ---
> hw/sd/sd.c | 7 +++++--
> 1 file changed, 5 insertions(+), 2 deletions(-)
>
> Update as per review:
> -> https://lists.gnu.org/archive/html/qemu-devel/2016-01/msg03769.html
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
thanks
-- PMM
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [Qemu-devel] [PATCH v2] sd: limit 'req.cmd' while using as an array index
2016-01-20 18:50 [Qemu-devel] [PATCH v2] sd: limit 'req.cmd' while using as an array index P J P
2016-01-25 11:51 ` Peter Maydell
@ 2016-02-09 17:04 ` Peter Maydell
1 sibling, 0 replies; 3+ messages in thread
From: Peter Maydell @ 2016-02-09 17:04 UTC (permalink / raw)
To: P J P; +Cc: Qinghao Tang, QEMU Developers, Prasad J Pandit
On 20 January 2016 at 18:50, P J P <ppandit@redhat.com> wrote:
> From: Prasad J Pandit <pjp@fedoraproject.org>
>
> While processing standard SD commands, the 'req.cmd' value could
> lead to OOB read when used as an index into 'sd_cmd_type' or
> 'sd_cmd_class' arrays. Limit 'req.cmd' value to avoid such an
> access.
>
> Reported-by: Qinghao Tang <luodalongde@gmail.com>
> Signed-off-by: Prasad J Pandit <pjp@fedoraproject.org>
Applied to target-arm.next, thanks.
-- PMM
^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-01-20 18:50 [Qemu-devel] [PATCH v2] sd: limit 'req.cmd' while using as an array index P J P
2016-01-25 11:51 ` Peter Maydell
2016-02-09 17:04 ` Peter Maydell
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