* [PATCH-for-6.0? v2] mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392)
@ 2021-04-18 5:30 Philippe Mathieu-Daudé
2021-04-18 5:31 ` Philippe Mathieu-Daudé
2021-04-19 13:32 ` Peter Maydell
0 siblings, 2 replies; 4+ messages in thread
From: Philippe Mathieu-Daudé @ 2021-04-18 5:30 UTC (permalink / raw)
To: qemu-devel
Cc: Fam Zheng, Peter Maydell, Mauro Matteo Cascella, Prasad J Pandit,
Michael Tokarev, Don Slutz, Li Qiang, qemu-stable, Paolo Bonzini,
Philippe Mathieu-Daudé,
Cheolwoo Myung
From: Michael Tokarev <mjt@tls.msk.ru>
While processing SCSI i/o requests in mptsas_process_scsi_io_request(),
the Megaraid emulator appends new MPTSASRequest object 'req' to
the 's->pending' queue. In case of an error, this same object gets
dequeued in mptsas_free_request() only if SCSIRequest object
'req->sreq' is initialised. This may lead to a use-after-free issue.
Since s->pending is actually not used, simply remove it from
MPTSASState.
Cc: qemu-stable@nongnu.org
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
Reported-by: Cheolwoo Myung <cwmyung@snu.ac.kr>
BugLink: https://bugs.launchpad.net/qemu/+bug/1914236 (CVE-2021-3392)
Fixes: e351b826112 ("hw: Add support for LSI SAS1068 (mptsas) device")
[PMD: Reworded description, added more tags]
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
Supersedes: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
MJT patch:
https://www.mail-archive.com/qemu-devel@nongnu.org/msg799236.html
Since rc4 is soon, I'm directly respining his patch with my comments
addressed.
This is not a new regression (present since QEMU v2.6.0) but is a
CVE...
PJP first patch:
https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg02660.html
---
hw/scsi/mptsas.h | 1 -
hw/scsi/mptsas.c | 4 ----
2 files changed, 5 deletions(-)
diff --git a/hw/scsi/mptsas.h b/hw/scsi/mptsas.h
index b85ac1a5fcc..c046497db71 100644
--- a/hw/scsi/mptsas.h
+++ b/hw/scsi/mptsas.h
@@ -79,7 +79,6 @@ struct MPTSASState {
uint16_t reply_frame_size;
SCSIBus bus;
- QTAILQ_HEAD(, MPTSASRequest) pending;
};
void mptsas_fix_scsi_io_endianness(MPIMsgSCSIIORequest *req);
diff --git a/hw/scsi/mptsas.c b/hw/scsi/mptsas.c
index 7416e787061..5abbc742aaf 100644
--- a/hw/scsi/mptsas.c
+++ b/hw/scsi/mptsas.c
@@ -257,7 +257,6 @@ static void mptsas_free_request(MPTSASRequest *req)
req->sreq->hba_private = NULL;
scsi_req_unref(req->sreq);
req->sreq = NULL;
- QTAILQ_REMOVE(&s->pending, req, next);
}
qemu_sglist_destroy(&req->qsg);
g_free(req);
@@ -303,7 +302,6 @@ static int mptsas_process_scsi_io_request(MPTSASState *s,
}
req = g_new0(MPTSASRequest, 1);
- QTAILQ_INSERT_TAIL(&s->pending, req, next);
req->scsi_io = *scsi_io;
req->dev = s;
@@ -1319,8 +1317,6 @@ static void mptsas_scsi_realize(PCIDevice *dev, Error **errp)
s->request_bh = qemu_bh_new(mptsas_fetch_requests, s);
- QTAILQ_INIT(&s->pending);
-
scsi_bus_new(&s->bus, sizeof(s->bus), &dev->qdev, &mptsas_scsi_info, NULL);
}
--
2.26.3
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH-for-6.0? v2] mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392)
2021-04-18 5:30 [PATCH-for-6.0? v2] mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392) Philippe Mathieu-Daudé
@ 2021-04-18 5:31 ` Philippe Mathieu-Daudé
2021-04-19 13:32 ` Peter Maydell
1 sibling, 0 replies; 4+ messages in thread
From: Philippe Mathieu-Daudé @ 2021-04-18 5:31 UTC (permalink / raw)
To: qemu-devel
Cc: Fam Zheng, Peter Maydell, Mauro Matteo Cascella, Prasad J Pandit,
Michael Tokarev, Don Slutz, Li Qiang, qemu-stable, Paolo Bonzini,
Cheolwoo Myung
On 4/18/21 7:30 AM, Philippe Mathieu-Daudé wrote:
> From: Michael Tokarev <mjt@tls.msk.ru>
>
> While processing SCSI i/o requests in mptsas_process_scsi_io_request(),
> the Megaraid emulator appends new MPTSASRequest object 'req' to
> the 's->pending' queue. In case of an error, this same object gets
> dequeued in mptsas_free_request() only if SCSIRequest object
> 'req->sreq' is initialised. This may lead to a use-after-free issue.
>
> Since s->pending is actually not used, simply remove it from
> MPTSASState.
>
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Message-Id: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
> Reported-by: Cheolwoo Myung <cwmyung@snu.ac.kr>
> BugLink: https://bugs.launchpad.net/qemu/+bug/1914236 (CVE-2021-3392)
> Fixes: e351b826112 ("hw: Add support for LSI SAS1068 (mptsas) device")
> [PMD: Reworded description, added more tags]
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> Supersedes: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
>
> MJT patch:
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg799236.html
>
> Since rc4 is soon, I'm directly respining his patch with my comments
> addressed.
>
> This is not a new regression (present since QEMU v2.6.0) but is a
> CVE...
>
> PJP first patch:
> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg02660.html
> ---
> hw/scsi/mptsas.h | 1 -
> hw/scsi/mptsas.c | 4 ----
> 2 files changed, 5 deletions(-)
>
> diff --git a/hw/scsi/mptsas.h b/hw/scsi/mptsas.h
> index b85ac1a5fcc..c046497db71 100644
> --- a/hw/scsi/mptsas.h
> +++ b/hw/scsi/mptsas.h
> @@ -79,7 +79,6 @@ struct MPTSASState {
> uint16_t reply_frame_size;
>
> SCSIBus bus;
> - QTAILQ_HEAD(, MPTSASRequest) pending;
> };
>
> void mptsas_fix_scsi_io_endianness(MPIMsgSCSIIORequest *req);
> diff --git a/hw/scsi/mptsas.c b/hw/scsi/mptsas.c
> index 7416e787061..5abbc742aaf 100644
> --- a/hw/scsi/mptsas.c
> +++ b/hw/scsi/mptsas.c
> @@ -257,7 +257,6 @@ static void mptsas_free_request(MPTSASRequest *req)
> req->sreq->hba_private = NULL;
> scsi_req_unref(req->sreq);
> req->sreq = NULL;
> - QTAILQ_REMOVE(&s->pending, req, next);
> }
> qemu_sglist_destroy(&req->qsg);
> g_free(req);
> @@ -303,7 +302,6 @@ static int mptsas_process_scsi_io_request(MPTSASState *s,
> }
>
> req = g_new0(MPTSASRequest, 1);
> - QTAILQ_INSERT_TAIL(&s->pending, req, next);
> req->scsi_io = *scsi_io;
> req->dev = s;
>
> @@ -1319,8 +1317,6 @@ static void mptsas_scsi_realize(PCIDevice *dev, Error **errp)
>
> s->request_bh = qemu_bh_new(mptsas_fetch_requests, s);
>
> - QTAILQ_INIT(&s->pending);
> -
> scsi_bus_new(&s->bus, sizeof(s->bus), &dev->qdev, &mptsas_scsi_info, NULL);
> }
>
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH-for-6.0? v2] mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392)
2021-04-18 5:30 [PATCH-for-6.0? v2] mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392) Philippe Mathieu-Daudé
2021-04-18 5:31 ` Philippe Mathieu-Daudé
@ 2021-04-19 13:32 ` Peter Maydell
2021-04-19 13:42 ` Philippe Mathieu-Daudé
1 sibling, 1 reply; 4+ messages in thread
From: Peter Maydell @ 2021-04-19 13:32 UTC (permalink / raw)
To: Philippe Mathieu-Daudé
Cc: Fam Zheng, Mauro Matteo Cascella, Prasad J Pandit,
Michael Tokarev, Don Slutz, Li Qiang, QEMU Developers,
qemu-stable, Paolo Bonzini, Cheolwoo Myung
On Sun, 18 Apr 2021 at 06:30, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>
> From: Michael Tokarev <mjt@tls.msk.ru>
>
> While processing SCSI i/o requests in mptsas_process_scsi_io_request(),
> the Megaraid emulator appends new MPTSASRequest object 'req' to
> the 's->pending' queue. In case of an error, this same object gets
> dequeued in mptsas_free_request() only if SCSIRequest object
> 'req->sreq' is initialised. This may lead to a use-after-free issue.
>
> Since s->pending is actually not used, simply remove it from
> MPTSASState.
>
> Cc: qemu-stable@nongnu.org
> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Message-Id: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
> Reported-by: Cheolwoo Myung <cwmyung@snu.ac.kr>
> BugLink: https://bugs.launchpad.net/qemu/+bug/1914236 (CVE-2021-3392)
> Fixes: e351b826112 ("hw: Add support for LSI SAS1068 (mptsas) device")
> [PMD: Reworded description, added more tags]
> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> ---
> Supersedes: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
>
> MJT patch:
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg799236.html
>
> Since rc4 is soon, I'm directly respining his patch with my comments
> addressed.
>
> This is not a new regression (present since QEMU v2.6.0) but is a
> CVE...
>
> PJP first patch:
> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg02660.html
> ---
> hw/scsi/mptsas.h | 1 -
> hw/scsi/mptsas.c | 4 ----
> 2 files changed, 5 deletions(-)
This fails to compile:
../../hw/scsi/mptsas.c: In function ‘mptsas_free_request’:
../../hw/scsi/mptsas.c:254:18: error: unused variable ‘s’
[-Werror=unused-variable]
MPTSASState *s = req->dev;
^
cc1: all warnings being treated as errors
thanks
-- PMM
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [PATCH-for-6.0? v2] mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392)
2021-04-19 13:32 ` Peter Maydell
@ 2021-04-19 13:42 ` Philippe Mathieu-Daudé
0 siblings, 0 replies; 4+ messages in thread
From: Philippe Mathieu-Daudé @ 2021-04-19 13:42 UTC (permalink / raw)
To: Peter Maydell
Cc: Fam Zheng, Mauro Matteo Cascella, Prasad J Pandit,
Michael Tokarev, Don Slutz, Li Qiang, QEMU Developers,
qemu-stable, Paolo Bonzini, Cheolwoo Myung
On 4/19/21 3:32 PM, Peter Maydell wrote:
> On Sun, 18 Apr 2021 at 06:30, Philippe Mathieu-Daudé <philmd@redhat.com> wrote:
>>
>> From: Michael Tokarev <mjt@tls.msk.ru>
>>
>> While processing SCSI i/o requests in mptsas_process_scsi_io_request(),
>> the Megaraid emulator appends new MPTSASRequest object 'req' to
>> the 's->pending' queue. In case of an error, this same object gets
>> dequeued in mptsas_free_request() only if SCSIRequest object
>> 'req->sreq' is initialised. This may lead to a use-after-free issue.
>>
>> Since s->pending is actually not used, simply remove it from
>> MPTSASState.
>>
>> Cc: qemu-stable@nongnu.org
>> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
>> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>> Message-Id: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
>> Reported-by: Cheolwoo Myung <cwmyung@snu.ac.kr>
>> BugLink: https://bugs.launchpad.net/qemu/+bug/1914236 (CVE-2021-3392)
>> Fixes: e351b826112 ("hw: Add support for LSI SAS1068 (mptsas) device")
>> [PMD: Reworded description, added more tags]
>> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
>> ---
>> Supersedes: <20210416102243.1293871-1-mjt@msgid.tls.msk.ru>
>>
>> MJT patch:
>> https://www.mail-archive.com/qemu-devel@nongnu.org/msg799236.html
>>
>> Since rc4 is soon, I'm directly respining his patch with my comments
>> addressed.
>>
>> This is not a new regression (present since QEMU v2.6.0) but is a
>> CVE...
>>
>> PJP first patch:
>> https://lists.gnu.org/archive/html/qemu-devel/2021-02/msg02660.html
>> ---
>> hw/scsi/mptsas.h | 1 -
>> hw/scsi/mptsas.c | 4 ----
>> 2 files changed, 5 deletions(-)
>
> This fails to compile:
>
> ../../hw/scsi/mptsas.c: In function ‘mptsas_free_request’:
> ../../hw/scsi/mptsas.c:254:18: error: unused variable ‘s’
> [-Werror=unused-variable]
> MPTSASState *s = req->dev;
> ^
> cc1: all warnings being treated as errors
What a shame... Sorry, v3 coming.
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-04-18 5:30 [PATCH-for-6.0? v2] mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392) Philippe Mathieu-Daudé
2021-04-18 5:31 ` Philippe Mathieu-Daudé
2021-04-19 13:32 ` Peter Maydell
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