The user can pass in any value to the driver through the 'ioctl'
interface. The driver dost not check, which may cause DoS bugs.
The following log reveals it:
divide error: 0000 [#1] PREEMPT SMP KASAN PTI
RIP: 0010:SetOverlayViewPort+0x133/0x5f0 drivers/video/fbdev/kyro/STG4000OverlayDevice.c:476
Call Trace:
kyro_dev_overlay_viewport_set drivers/video/fbdev/kyro/fbdev.c:378 [inline]
kyrofb_ioctl+0x2eb/0x330 drivers/video/fbdev/kyro/fbdev.c:603
do_fb_ioctl+0x1f3/0x700 drivers/video/fbdev/core/fbmem.c:1171
fb_ioctl+0xeb/0x130 drivers/video/fbdev/core/fbmem.c:1185
vfs_ioctl fs/ioctl.c:48 [inline]
__do_sys_ioctl fs/ioctl.c:753 [inline]
__se_sys_ioctl fs/ioctl.c:739 [inline]
__x64_sys_ioctl+0x19b/0x220 fs/ioctl.c:739
do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46
entry_SYSCALL_64_after_hwframe+0x44/0xae
Signed-off-by: Zheyu Ma <[email protected]>
---
Changes in v2:
- Validate the inputs on a higher level
---
drivers/video/fbdev/kyro/fbdev.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/video/fbdev/kyro/fbdev.c b/drivers/video/fbdev/kyro/fbdev.c
index 8fbde92ae8b9..eb0cbd1d12d5 100644
--- a/drivers/video/fbdev/kyro/fbdev.c
+++ b/drivers/video/fbdev/kyro/fbdev.c
@@ -372,6 +372,11 @@ static int kyro_dev_overlay_viewport_set(u32 x, u32 y, u32 ulWidth, u32 ulHeight
/* probably haven't called CreateOverlay yet */
return -EINVAL;
+ if (ulWidth == 0 || ulWidth == 0xffffffff ||
+ ulHeight == 0 || ulHeight == 0xffffffff ||
+ (x < 2 && ulWidth + 2 == 0))
+ return -EINVAL;
+
/* Stop Ramdac Output */
DisableRamdacOutput(deviceInfo.pSTGReg);
--
2.17.6
On Tue, Jul 20, 2021 at 2:50 AM Sam Ravnborg <[email protected]> wrote:
>
> Hi Zheyu,
> On Wed, Jul 14, 2021 at 04:09:22AM +0000, Zheyu Ma wrote:
> > The user can pass in any value to the driver through the 'ioctl'
> > interface. The driver dost not check, which may cause DoS bugs.
> >
> > The following log reveals it:
> >
> > divide error: 0000 [#1] PREEMPT SMP KASAN PTI
> > RIP: 0010:SetOverlayViewPort+0x133/0x5f0 drivers/video/fbdev/kyro/STG4000OverlayDevice.c:476
> > Call Trace:
> > kyro_dev_overlay_viewport_set drivers/video/fbdev/kyro/fbdev.c:378 [inline]
> > kyrofb_ioctl+0x2eb/0x330 drivers/video/fbdev/kyro/fbdev.c:603
> > do_fb_ioctl+0x1f3/0x700 drivers/video/fbdev/core/fbmem.c:1171
> > fb_ioctl+0xeb/0x130 drivers/video/fbdev/core/fbmem.c:1185
> > vfs_ioctl fs/ioctl.c:48 [inline]
> > __do_sys_ioctl fs/ioctl.c:753 [inline]
> > __se_sys_ioctl fs/ioctl.c:739 [inline]
> > __x64_sys_ioctl+0x19b/0x220 fs/ioctl.c:739
> > do_syscall_64+0x32/0x80 arch/x86/entry/common.c:46
> > entry_SYSCALL_64_after_hwframe+0x44/0xae
> >
> > Signed-off-by: Zheyu Ma <[email protected]>
> > ---
> > Changes in v2:
> > - Validate the inputs on a higher level
>
> Much better, thanks.
> When a line is continued like here the statement shall aling with the
> opening brace. I fixed it up when applying the patch to drm-misc-next so
> no need to do anything this time.
Thanks for your kind reminder, I will pay attention next time.
Regards,
Zheyu Ma