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* [PATCH] memstick: rtsx_usb_ms: fix UAF
@ 2021-05-09 21:54 Tong Zhang
  2021-05-11 10:39 ` Ulf Hansson
  0 siblings, 1 reply; 5+ messages in thread
From: Tong Zhang @ 2021-05-09 21:54 UTC (permalink / raw)
  To: Maxim Levitsky, Alex Dubov, Ulf Hansson, Tong Zhang, linux-mmc,
	linux-kernel

This patch fixes the following issues:
1. memstick_free_host() will free the host, so the use of ms_dev(host) after
it will be a problem. To fix this, move memstick_free_host() after when we
are done with ms_dev(host).
2. if something bad happens in memstick_add_host() and we end up taking
err_out in rtsx_usb_ms_drv_probe(), we'd better avoid running rtsx_usb_ms_drv_remove()
3. In rtsx_usb_ms_drv_remove(), pm need to be disabled before we remove
and free host otherwise memstick_check will be called and UAF will
happen.

[   11.351173] BUG: KASAN: use-after-free in rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
[   11.357077]  rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
[   11.357376]  platform_remove+0x2a/0x50
[   11.367531] Freed by task 298:
[   11.368537]  kfree+0xa4/0x2a0
[   11.368711]  device_release+0x51/0xe0
[   11.368905]  kobject_put+0xa2/0x120
[   11.369090]  rtsx_usb_ms_drv_remove+0x8c/0x140 [rtsx_usb_ms]
[   11.369386]  platform_remove+0x2a/0x50

[   12.038408] BUG: KASAN: use-after-free in __mutex_lock.isra.0+0x3ec/0x7c0
[   12.045432]  mutex_lock+0xc9/0xd0
[   12.046080]  memstick_check+0x6a/0x578 [memstick]
[   12.046509]  process_one_work+0x46d/0x750
[   12.052107] Freed by task 297:
[   12.053115]  kfree+0xa4/0x2a0
[   12.053272]  device_release+0x51/0xe0
[   12.053463]  kobject_put+0xa2/0x120
[   12.053647]  rtsx_usb_ms_drv_remove+0xc4/0x140 [rtsx_usb_ms]
[   12.053939]  platform_remove+0x2a/0x50

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
---
 drivers/memstick/host/rtsx_usb_ms.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
index 102dbb8080da..851643d007b7 100644
--- a/drivers/memstick/host/rtsx_usb_ms.c
+++ b/drivers/memstick/host/rtsx_usb_ms.c
@@ -799,9 +799,10 @@ static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
 
 	return 0;
 err_out:
-	memstick_free_host(msh);
 	pm_runtime_disable(ms_dev(host));
 	pm_runtime_put_noidle(ms_dev(host));
+	memstick_free_host(msh);
+	platform_set_drvdata(pdev, NULL);
 	return err;
 }
 
@@ -811,6 +812,8 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 	struct memstick_host *msh = host->msh;
 	int err;
 
+	if (!host)
+		return 0;
 	host->eject = true;
 	cancel_work_sync(&host->handle_req);
 
@@ -828,9 +831,6 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 	}
 	mutex_unlock(&host->host_mutex);
 
-	memstick_remove_host(msh);
-	memstick_free_host(msh);
-
 	/* Balance possible unbalanced usage count
 	 * e.g. unconditional module removal
 	 */
@@ -838,10 +838,11 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 		pm_runtime_put(ms_dev(host));
 
 	pm_runtime_disable(ms_dev(host));
-	platform_set_drvdata(pdev, NULL);
-
+	memstick_remove_host(msh);
 	dev_dbg(ms_dev(host),
 		": Realtek USB Memstick controller has been removed\n");
+	memstick_free_host(msh);
+	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread
* Re: [PATCH] memstick: rtsx_usb_ms: fix UAF
  2021-05-09 21:54 [PATCH] memstick: rtsx_usb_ms: fix UAF Tong Zhang
@ 2021-05-11 10:39 ` Ulf Hansson
  2021-05-11 16:39   ` [PATCH v2] " Tong Zhang
  2021-05-11 16:41   ` [PATCH] " Tong Zhang
  0 siblings, 2 replies; 5+ messages in thread
From: Ulf Hansson @ 2021-05-11 10:39 UTC (permalink / raw)
  To: Tong Zhang
  Cc: Maxim Levitsky, Alex Dubov, linux-mmc, Linux Kernel Mailing List

On Sun, 9 May 2021 at 23:54, Tong Zhang <ztong0001@gmail.com> wrote:
>
> This patch fixes the following issues:
> 1. memstick_free_host() will free the host, so the use of ms_dev(host) after
> it will be a problem. To fix this, move memstick_free_host() after when we
> are done with ms_dev(host).
> 2. if something bad happens in memstick_add_host() and we end up taking
> err_out in rtsx_usb_ms_drv_probe(), we'd better avoid running rtsx_usb_ms_drv_remove()

If the ->probe() function returns a negative error code, the driver
core will not invoke the corresponding ->remove() callback.

Looks like you may want to double check that ->probe() doesn't return
0, even in case of failure.

> 3. In rtsx_usb_ms_drv_remove(), pm need to be disabled before we remove
> and free host otherwise memstick_check will be called and UAF will
> happen.
>
> [   11.351173] BUG: KASAN: use-after-free in rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
> [   11.357077]  rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
> [   11.357376]  platform_remove+0x2a/0x50
> [   11.367531] Freed by task 298:
> [   11.368537]  kfree+0xa4/0x2a0
> [   11.368711]  device_release+0x51/0xe0
> [   11.368905]  kobject_put+0xa2/0x120
> [   11.369090]  rtsx_usb_ms_drv_remove+0x8c/0x140 [rtsx_usb_ms]
> [   11.369386]  platform_remove+0x2a/0x50
>
> [   12.038408] BUG: KASAN: use-after-free in __mutex_lock.isra.0+0x3ec/0x7c0
> [   12.045432]  mutex_lock+0xc9/0xd0
> [   12.046080]  memstick_check+0x6a/0x578 [memstick]
> [   12.046509]  process_one_work+0x46d/0x750
> [   12.052107] Freed by task 297:
> [   12.053115]  kfree+0xa4/0x2a0
> [   12.053272]  device_release+0x51/0xe0
> [   12.053463]  kobject_put+0xa2/0x120
> [   12.053647]  rtsx_usb_ms_drv_remove+0xc4/0x140 [rtsx_usb_ms]
> [   12.053939]  platform_remove+0x2a/0x50
>
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> ---
>  drivers/memstick/host/rtsx_usb_ms.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
> index 102dbb8080da..851643d007b7 100644
> --- a/drivers/memstick/host/rtsx_usb_ms.c
> +++ b/drivers/memstick/host/rtsx_usb_ms.c
> @@ -799,9 +799,10 @@ static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
>
>         return 0;
>  err_out:
> -       memstick_free_host(msh);
>         pm_runtime_disable(ms_dev(host));
>         pm_runtime_put_noidle(ms_dev(host));
> +       memstick_free_host(msh);
> +       platform_set_drvdata(pdev, NULL);
>         return err;
>  }
>
> @@ -811,6 +812,8 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
>         struct memstick_host *msh = host->msh;
>         int err;
>
> +       if (!host)
> +               return 0;

According to my comment above. You should not reach this point, unless
->probe() was successful and returned 0.

>         host->eject = true;
>         cancel_work_sync(&host->handle_req);
>
> @@ -828,9 +831,6 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
>         }
>         mutex_unlock(&host->host_mutex);
>
> -       memstick_remove_host(msh);
> -       memstick_free_host(msh);
> -
>         /* Balance possible unbalanced usage count
>          * e.g. unconditional module removal
>          */
> @@ -838,10 +838,11 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
>                 pm_runtime_put(ms_dev(host));
>
>         pm_runtime_disable(ms_dev(host));
> -       platform_set_drvdata(pdev, NULL);
> -
> +       memstick_remove_host(msh);
>         dev_dbg(ms_dev(host),
>                 ": Realtek USB Memstick controller has been removed\n");
> +       memstick_free_host(msh);
> +       platform_set_drvdata(pdev, NULL);
>
>         return 0;
>  }
> --
> 2.25.1
>

Besides the above, the change looks reasonable to me.

Kind regards
Uffe

^ permalink raw reply	[flat|nested] 5+ messages in thread
* [PATCH v2] memstick: rtsx_usb_ms: fix UAF
  2021-05-11 10:39 ` Ulf Hansson
@ 2021-05-11 16:39   ` Tong Zhang
  2021-05-24 14:10     ` Ulf Hansson
  2021-05-11 16:41   ` [PATCH] " Tong Zhang
  1 sibling, 1 reply; 5+ messages in thread
From: Tong Zhang @ 2021-05-11 16:39 UTC (permalink / raw)
  To: Maxim Levitsky, Alex Dubov, Ulf Hansson, Tong Zhang, linux-mmc,
	linux-kernel

This patch fixes the following issues:
1. memstick_free_host() will free the host, so the use of ms_dev(host) after
it will be a problem. To fix this, move memstick_free_host() after when we
are done with ms_dev(host).
2. In rtsx_usb_ms_drv_remove(), pm need to be disabled before we remove
and free host otherwise memstick_check will be called and UAF will
happen.

[   11.351173] BUG: KASAN: use-after-free in rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
[   11.357077]  rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
[   11.357376]  platform_remove+0x2a/0x50
[   11.367531] Freed by task 298:
[   11.368537]  kfree+0xa4/0x2a0
[   11.368711]  device_release+0x51/0xe0
[   11.368905]  kobject_put+0xa2/0x120
[   11.369090]  rtsx_usb_ms_drv_remove+0x8c/0x140 [rtsx_usb_ms]
[   11.369386]  platform_remove+0x2a/0x50

[   12.038408] BUG: KASAN: use-after-free in __mutex_lock.isra.0+0x3ec/0x7c0
[   12.045432]  mutex_lock+0xc9/0xd0
[   12.046080]  memstick_check+0x6a/0x578 [memstick]
[   12.046509]  process_one_work+0x46d/0x750
[   12.052107] Freed by task 297:
[   12.053115]  kfree+0xa4/0x2a0
[   12.053272]  device_release+0x51/0xe0
[   12.053463]  kobject_put+0xa2/0x120
[   12.053647]  rtsx_usb_ms_drv_remove+0xc4/0x140 [rtsx_usb_ms]
[   12.053939]  platform_remove+0x2a/0x50

Signed-off-by: Tong Zhang <ztong0001@gmail.com>
Co-Developed-by: Ulf Hansson <ulf.hansson@linaro.org>
---
v2: remove useless code in err_out label

 drivers/memstick/host/rtsx_usb_ms.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
index 102dbb8080da..29271ad4728a 100644
--- a/drivers/memstick/host/rtsx_usb_ms.c
+++ b/drivers/memstick/host/rtsx_usb_ms.c
@@ -799,9 +799,9 @@ static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
 
 	return 0;
 err_out:
-	memstick_free_host(msh);
 	pm_runtime_disable(ms_dev(host));
 	pm_runtime_put_noidle(ms_dev(host));
+	memstick_free_host(msh);
 	return err;
 }
 
@@ -828,9 +828,6 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 	}
 	mutex_unlock(&host->host_mutex);
 
-	memstick_remove_host(msh);
-	memstick_free_host(msh);
-
 	/* Balance possible unbalanced usage count
 	 * e.g. unconditional module removal
 	 */
@@ -838,10 +835,11 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
 		pm_runtime_put(ms_dev(host));
 
 	pm_runtime_disable(ms_dev(host));
-	platform_set_drvdata(pdev, NULL);
-
+	memstick_remove_host(msh);
 	dev_dbg(ms_dev(host),
 		": Realtek USB Memstick controller has been removed\n");
+	memstick_free_host(msh);
+	platform_set_drvdata(pdev, NULL);
 
 	return 0;
 }
-- 
2.25.1


^ permalink raw reply related	[flat|nested] 5+ messages in thread
* Re: [PATCH] memstick: rtsx_usb_ms: fix UAF
  2021-05-11 10:39 ` Ulf Hansson
  2021-05-11 16:39   ` [PATCH v2] " Tong Zhang
@ 2021-05-11 16:41   ` Tong Zhang
  1 sibling, 0 replies; 5+ messages in thread
From: Tong Zhang @ 2021-05-11 16:41 UTC (permalink / raw)
  To: Ulf Hansson
  Cc: Maxim Levitsky, Alex Dubov, linux-mmc, Linux Kernel Mailing List

On Tue, May 11, 2021 at 3:40 AM Ulf Hansson <ulf.hansson@linaro.org> wrote:
>
> On Sun, 9 May 2021 at 23:54, Tong Zhang <ztong0001@gmail.com> wrote:
> >
> > This patch fixes the following issues:
> > 1. memstick_free_host() will free the host, so the use of ms_dev(host) after
> > it will be a problem. To fix this, move memstick_free_host() after when we
> > are done with ms_dev(host).
> > 2. if something bad happens in memstick_add_host() and we end up taking
> > err_out in rtsx_usb_ms_drv_probe(), we'd better avoid running rtsx_usb_ms_drv_remove()
>
> If the ->probe() function returns a negative error code, the driver
> core will not invoke the corresponding ->remove() callback.
>
> Looks like you may want to double check that ->probe() doesn't return
> 0, even in case of failure.
>
> > 3. In rtsx_usb_ms_drv_remove(), pm need to be disabled before we remove
> > and free host otherwise memstick_check will be called and UAF will
> > happen.
> >
> > [   11.351173] BUG: KASAN: use-after-free in rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
> > [   11.357077]  rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
> > [   11.357376]  platform_remove+0x2a/0x50
> > [   11.367531] Freed by task 298:
> > [   11.368537]  kfree+0xa4/0x2a0
> > [   11.368711]  device_release+0x51/0xe0
> > [   11.368905]  kobject_put+0xa2/0x120
> > [   11.369090]  rtsx_usb_ms_drv_remove+0x8c/0x140 [rtsx_usb_ms]
> > [   11.369386]  platform_remove+0x2a/0x50
> >
> > [   12.038408] BUG: KASAN: use-after-free in __mutex_lock.isra.0+0x3ec/0x7c0
> > [   12.045432]  mutex_lock+0xc9/0xd0
> > [   12.046080]  memstick_check+0x6a/0x578 [memstick]
> > [   12.046509]  process_one_work+0x46d/0x750
> > [   12.052107] Freed by task 297:
> > [   12.053115]  kfree+0xa4/0x2a0
> > [   12.053272]  device_release+0x51/0xe0
> > [   12.053463]  kobject_put+0xa2/0x120
> > [   12.053647]  rtsx_usb_ms_drv_remove+0xc4/0x140 [rtsx_usb_ms]
> > [   12.053939]  platform_remove+0x2a/0x50
> >
> > Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> > ---
> >  drivers/memstick/host/rtsx_usb_ms.c | 13 +++++++------
> >  1 file changed, 7 insertions(+), 6 deletions(-)
> >
> > diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
> > index 102dbb8080da..851643d007b7 100644
> > --- a/drivers/memstick/host/rtsx_usb_ms.c
> > +++ b/drivers/memstick/host/rtsx_usb_ms.c
> > @@ -799,9 +799,10 @@ static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
> >
> >         return 0;
> >  err_out:
> > -       memstick_free_host(msh);
> >         pm_runtime_disable(ms_dev(host));
> >         pm_runtime_put_noidle(ms_dev(host));
> > +       memstick_free_host(msh);
> > +       platform_set_drvdata(pdev, NULL);
> >         return err;
> >  }
> >
> > @@ -811,6 +812,8 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
> >         struct memstick_host *msh = host->msh;
> >         int err;
> >
> > +       if (!host)
> > +               return 0;
>
> According to my comment above. You should not reach this point, unless
> ->probe() was successful and returned 0.
>
> >         host->eject = true;
> >         cancel_work_sync(&host->handle_req);
> >
> > @@ -828,9 +831,6 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
> >         }
> >         mutex_unlock(&host->host_mutex);
> >
> > -       memstick_remove_host(msh);
> > -       memstick_free_host(msh);
> > -
> >         /* Balance possible unbalanced usage count
> >          * e.g. unconditional module removal
> >          */
> > @@ -838,10 +838,11 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
> >                 pm_runtime_put(ms_dev(host));
> >
> >         pm_runtime_disable(ms_dev(host));
> > -       platform_set_drvdata(pdev, NULL);
> > -
> > +       memstick_remove_host(msh);
> >         dev_dbg(ms_dev(host),
> >                 ": Realtek USB Memstick controller has been removed\n");
> > +       memstick_free_host(msh);
> > +       platform_set_drvdata(pdev, NULL);
> >
> >         return 0;
> >  }
> > --
> > 2.25.1
> >
>
> Besides the above, the change looks reasonable to me.
>
> Kind regards
> Uffe
Thanks Uffe!
I modified the patch as suggested and sent as v2.
Best,
- Tong

^ permalink raw reply	[flat|nested] 5+ messages in thread
* Re: [PATCH v2] memstick: rtsx_usb_ms: fix UAF
  2021-05-11 16:39   ` [PATCH v2] " Tong Zhang
@ 2021-05-24 14:10     ` Ulf Hansson
  0 siblings, 0 replies; 5+ messages in thread
From: Ulf Hansson @ 2021-05-24 14:10 UTC (permalink / raw)
  To: Tong Zhang
  Cc: Maxim Levitsky, Alex Dubov, linux-mmc, Linux Kernel Mailing List

On Tue, 11 May 2021 at 18:40, Tong Zhang <ztong0001@gmail.com> wrote:
>
> This patch fixes the following issues:
> 1. memstick_free_host() will free the host, so the use of ms_dev(host) after
> it will be a problem. To fix this, move memstick_free_host() after when we
> are done with ms_dev(host).
> 2. In rtsx_usb_ms_drv_remove(), pm need to be disabled before we remove
> and free host otherwise memstick_check will be called and UAF will
> happen.
>
> [   11.351173] BUG: KASAN: use-after-free in rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
> [   11.357077]  rtsx_usb_ms_drv_remove+0x94/0x140 [rtsx_usb_ms]
> [   11.357376]  platform_remove+0x2a/0x50
> [   11.367531] Freed by task 298:
> [   11.368537]  kfree+0xa4/0x2a0
> [   11.368711]  device_release+0x51/0xe0
> [   11.368905]  kobject_put+0xa2/0x120
> [   11.369090]  rtsx_usb_ms_drv_remove+0x8c/0x140 [rtsx_usb_ms]
> [   11.369386]  platform_remove+0x2a/0x50
>
> [   12.038408] BUG: KASAN: use-after-free in __mutex_lock.isra.0+0x3ec/0x7c0
> [   12.045432]  mutex_lock+0xc9/0xd0
> [   12.046080]  memstick_check+0x6a/0x578 [memstick]
> [   12.046509]  process_one_work+0x46d/0x750
> [   12.052107] Freed by task 297:
> [   12.053115]  kfree+0xa4/0x2a0
> [   12.053272]  device_release+0x51/0xe0
> [   12.053463]  kobject_put+0xa2/0x120
> [   12.053647]  rtsx_usb_ms_drv_remove+0xc4/0x140 [rtsx_usb_ms]
> [   12.053939]  platform_remove+0x2a/0x50
>
> Signed-off-by: Tong Zhang <ztong0001@gmail.com>
> Co-Developed-by: Ulf Hansson <ulf.hansson@linaro.org>

Applied for next, thanks!

Kind regards
Uffe


> ---
> v2: remove useless code in err_out label
>
>  drivers/memstick/host/rtsx_usb_ms.c | 10 ++++------
>  1 file changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/memstick/host/rtsx_usb_ms.c b/drivers/memstick/host/rtsx_usb_ms.c
> index 102dbb8080da..29271ad4728a 100644
> --- a/drivers/memstick/host/rtsx_usb_ms.c
> +++ b/drivers/memstick/host/rtsx_usb_ms.c
> @@ -799,9 +799,9 @@ static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
>
>         return 0;
>  err_out:
> -       memstick_free_host(msh);
>         pm_runtime_disable(ms_dev(host));
>         pm_runtime_put_noidle(ms_dev(host));
> +       memstick_free_host(msh);
>         return err;
>  }
>
> @@ -828,9 +828,6 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
>         }
>         mutex_unlock(&host->host_mutex);
>
> -       memstick_remove_host(msh);
> -       memstick_free_host(msh);
> -
>         /* Balance possible unbalanced usage count
>          * e.g. unconditional module removal
>          */
> @@ -838,10 +835,11 @@ static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
>                 pm_runtime_put(ms_dev(host));
>
>         pm_runtime_disable(ms_dev(host));
> -       platform_set_drvdata(pdev, NULL);
> -
> +       memstick_remove_host(msh);
>         dev_dbg(ms_dev(host),
>                 ": Realtek USB Memstick controller has been removed\n");
> +       memstick_free_host(msh);
> +       platform_set_drvdata(pdev, NULL);
>
>         return 0;
>  }
> --
> 2.25.1
>

^ permalink raw reply	[flat|nested] 5+ messages in thread
end of thread, other threads:[~2021-05-24 14:11 UTC | newest]

Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-09 21:54 [PATCH] memstick: rtsx_usb_ms: fix UAF Tong Zhang
2021-05-11 10:39 ` Ulf Hansson
2021-05-11 16:39   ` [PATCH v2] " Tong Zhang
2021-05-24 14:10     ` Ulf Hansson
2021-05-11 16:41   ` [PATCH] " Tong Zhang

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