* [PATCH] mpt3sas_ctl: fix double-fetch bug in _ctl_ioctl_main()
@ 2019-05-30 1:10 Gen Zhang
2019-05-30 2:22 ` Martin K. Petersen
0 siblings, 1 reply; 5+ messages in thread
From: Gen Zhang @ 2019-05-30 1:10 UTC (permalink / raw)
To: sathya.prakash, chaitra.basappa, jejb, martin.petersen
Cc: suganath-prabu.subramani, MPT-FusionLinux.pdl, linux-scsi,
linux-kernel
In _ctl_ioctl_main(), 'ioctl_header' is fetched the first time from
userspace. 'ioctl_header.ioc_number' is then checked. The legal result
is saved to 'ioc'. Then, in condition MPT3COMMAND, the whole struct is
fetched again from the userspace. Then _ctl_do_mpt_command() is called,
'ioc' and 'karg' as inputs.
However, a malicious user can change the 'ioc_number' between the two
fetches, which will cause a potential security issues. Moreover, a
malicious user can provide a valid 'ioc_number' to pass the check in
first fetch, and then modify it in the second fetch.
To fix this, we need to recheck the 'ioc_number' in the second fetch.
Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
Ack-by: Suganath Prabu S <suganath-prabu.subramani@broadcom.com>
---
diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
index b2bb47c..5181c03 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
@@ -2319,6 +2319,10 @@ _ctl_ioctl_main(struct file *file, unsigned int cmd, void __user *arg,
break;
}
+ if (karg.hdr.ioc_number != ioctl_header.ioc_number) {
+ ret = -EINVAL;
+ break;
+ }
if (_IOC_SIZE(cmd) == sizeof(struct mpt3_ioctl_command)) {
uarg = arg;
ret = _ctl_do_mpt_command(ioc, karg, &uarg->mf);
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] mpt3sas_ctl: fix double-fetch bug in _ctl_ioctl_main()
2019-05-30 1:10 [PATCH] mpt3sas_ctl: fix double-fetch bug in _ctl_ioctl_main() Gen Zhang
@ 2019-05-30 2:22 ` Martin K. Petersen
0 siblings, 0 replies; 5+ messages in thread
From: Martin K. Petersen @ 2019-05-30 2:22 UTC (permalink / raw)
To: Gen Zhang
Cc: sathya.prakash, chaitra.basappa, jejb, martin.petersen,
suganath-prabu.subramani, MPT-FusionLinux.pdl, linux-scsi,
linux-kernel
Gen,
> In _ctl_ioctl_main(), 'ioctl_header' is fetched the first time from
> userspace. 'ioctl_header.ioc_number' is then checked. The legal result
> is saved to 'ioc'. Then, in condition MPT3COMMAND, the whole struct is
> fetched again from the userspace. Then _ctl_do_mpt_command() is called,
> 'ioc' and 'karg' as inputs.
>
> However, a malicious user can change the 'ioc_number' between the two
> fetches, which will cause a potential security issues. Moreover, a
> malicious user can provide a valid 'ioc_number' to pass the check in
> first fetch, and then modify it in the second fetch.
>
> To fix this, we need to recheck the 'ioc_number' in the second fetch.
Applied to 5.3/scsi-queue, thanks.
--
Martin K. Petersen Oracle Linux Engineering
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH] mpt3sas_ctl: fix double-fetch bug in _ctl_ioctl_main()
@ 2019-05-27 0:57 Gen Zhang
2019-05-28 6:14 ` Suganath Prabu Subramani
0 siblings, 1 reply; 5+ messages in thread
From: Gen Zhang @ 2019-05-27 0:57 UTC (permalink / raw)
To: sathya.prakash, chaitra.basappa, suganath-prabu.subramani, jejb,
martin.petersen
Cc: MPT-FusionLinux.pdl, linux-scsi, linux-kernel
In _ctl_ioctl_main(), 'ioctl_header' is fetched the first time from
userspace. 'ioctl_header.ioc_number' is then checked. The legal result
is saved to 'ioc'. Then, in condition MPT3COMMAND, the whole struct is
fetched again from the userspace. Then _ctl_do_mpt_command() is called,
'ioc' and 'karg' as inputs.
However, a malicious user can change the 'ioc_number' between the two
fetches, which will cause a potential security issues. Moreover, a
malicious user can provide a valid 'ioc_number' to pass the check in
first fetch, and then modify it in the second fetch.
To fix this, we need to recheck the 'ioc_number' in the second fetch.
Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
---
diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
index b2bb47c..5181c03 100644
--- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
+++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
@@ -2319,6 +2319,10 @@ _ctl_ioctl_main(struct file *file, unsigned int cmd, void __user *arg,
break;
}
+ if (karg.hdr.ioc_number != ioctl_header.ioc_number) {
+ ret = -EINVAL;
+ break;
+ }
if (_IOC_SIZE(cmd) == sizeof(struct mpt3_ioctl_command)) {
uarg = arg;
ret = _ctl_do_mpt_command(ioc, karg, &uarg->mf);
^ permalink raw reply related [flat|nested] 5+ messages in thread* Re: [PATCH] mpt3sas_ctl: fix double-fetch bug in _ctl_ioctl_main()
2019-05-27 0:57 Gen Zhang
@ 2019-05-28 6:14 ` Suganath Prabu Subramani
2019-05-28 7:05 ` Gen Zhang
0 siblings, 1 reply; 5+ messages in thread
From: Suganath Prabu Subramani @ 2019-05-28 6:14 UTC (permalink / raw)
To: Martin K. Petersen
Cc: Sathya Prakash, James E.J. Bottomley, PDL-MPT-FUSIONLINUX,
Gen Zhang, linux-scsi, linux-kernel
Please consider this patch as Ack-by: Suganath Prabu S
<suganath-prabu.subramani@broadcom.com>
Thanks,
Suganath.
On Mon, May 27, 2019 at 6:27 AM Gen Zhang <blackgod016574@gmail.com> wrote:
>
> In _ctl_ioctl_main(), 'ioctl_header' is fetched the first time from
> userspace. 'ioctl_header.ioc_number' is then checked. The legal result
> is saved to 'ioc'. Then, in condition MPT3COMMAND, the whole struct is
> fetched again from the userspace. Then _ctl_do_mpt_command() is called,
> 'ioc' and 'karg' as inputs.
>
> However, a malicious user can change the 'ioc_number' between the two
> fetches, which will cause a potential security issues. Moreover, a
> malicious user can provide a valid 'ioc_number' to pass the check in
> first fetch, and then modify it in the second fetch.
>
> To fix this, we need to recheck the 'ioc_number' in the second fetch.
>
> Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
> ---
> diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> index b2bb47c..5181c03 100644
> --- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> +++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> @@ -2319,6 +2319,10 @@ _ctl_ioctl_main(struct file *file, unsigned int cmd, void __user *arg,
> break;
> }
>
> + if (karg.hdr.ioc_number != ioctl_header.ioc_number) {
> + ret = -EINVAL;
> + break;
> + }
> if (_IOC_SIZE(cmd) == sizeof(struct mpt3_ioctl_command)) {
> uarg = arg;
> ret = _ctl_do_mpt_command(ioc, karg, &uarg->mf);
^ permalink raw reply [flat|nested] 5+ messages in thread* Re: [PATCH] mpt3sas_ctl: fix double-fetch bug in _ctl_ioctl_main()
2019-05-28 6:14 ` Suganath Prabu Subramani
@ 2019-05-28 7:05 ` Gen Zhang
0 siblings, 0 replies; 5+ messages in thread
From: Gen Zhang @ 2019-05-28 7:05 UTC (permalink / raw)
To: Suganath Prabu Subramani
Cc: Martin K. Petersen, Sathya Prakash, James E.J. Bottomley,
PDL-MPT-FUSIONLINUX, linux-scsi, linux-kernel
On Tue, May 28, 2019 at 11:44:35AM +0530, Suganath Prabu Subramani wrote:
> Please consider this patch as Ack-by: Suganath Prabu S
> <suganath-prabu.subramani@broadcom.com>
>
> Thanks,
> Suganath.
>
>
> On Mon, May 27, 2019 at 6:27 AM Gen Zhang <blackgod016574@gmail.com> wrote:
> >
> > In _ctl_ioctl_main(), 'ioctl_header' is fetched the first time from
> > userspace. 'ioctl_header.ioc_number' is then checked. The legal result
> > is saved to 'ioc'. Then, in condition MPT3COMMAND, the whole struct is
> > fetched again from the userspace. Then _ctl_do_mpt_command() is called,
> > 'ioc' and 'karg' as inputs.
> >
> > However, a malicious user can change the 'ioc_number' between the two
> > fetches, which will cause a potential security issues. Moreover, a
> > malicious user can provide a valid 'ioc_number' to pass the check in
> > first fetch, and then modify it in the second fetch.
> >
> > To fix this, we need to recheck the 'ioc_number' in the second fetch.
> >
> > Signed-off-by: Gen Zhang <blackgod016574@gmail.com>
> > ---
> > diff --git a/drivers/scsi/mpt3sas/mpt3sas_ctl.c b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> > index b2bb47c..5181c03 100644
> > --- a/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> > +++ b/drivers/scsi/mpt3sas/mpt3sas_ctl.c
> > @@ -2319,6 +2319,10 @@ _ctl_ioctl_main(struct file *file, unsigned int cmd, void __user *arg,
> > break;
> > }
> >
> > + if (karg.hdr.ioc_number != ioctl_header.ioc_number) {
> > + ret = -EINVAL;
> > + break;
> > + }
> > if (_IOC_SIZE(cmd) == sizeof(struct mpt3_ioctl_command)) {
> > uarg = arg;
> > ret = _ctl_do_mpt_command(ioc, karg, &uarg->mf);
Thanks for your reply, Suganath.
Thanks
Gen
^ permalink raw reply [flat|nested] 5+ messages in thread
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