drivers/usb/gadget/function/f_uvc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
When building s390 allmodconfig after commit 9b91a6523078 ("usb: gadget:
uvc: increase worker prio to WQ_HIGHPRI"), the following error occurs:
In file included from ../include/linux/string.h:253,
from ../include/linux/bitmap.h:11,
from ../include/linux/cpumask.h:12,
from ../include/linux/smp.h:13,
from ../include/linux/lockdep.h:14,
from ../include/linux/rcupdate.h:29,
from ../include/linux/rculist.h:11,
from ../include/linux/pid.h:5,
from ../include/linux/sched.h:14,
from ../include/linux/ratelimit.h:6,
from ../include/linux/dev_printk.h:16,
from ../include/linux/device.h:15,
from ../drivers/usb/gadget/function/f_uvc.c:9:
In function ‘fortify_memset_chk’,
inlined from ‘uvc_register_video’ at ../drivers/usb/gadget/function/f_uvc.c:424:2:
../include/linux/fortify-string.h:301:25: error: call to ‘__write_overflow_field’ declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning]
301 | __write_overflow_field(p_size_field, size);
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
This points to the memset() in uvc_register_video(). It is clear that
the argument to sizeof() is incorrect, as uvc->vdev (a 'struct
video_device') is being zeroed out but the size of uvc->video (a 'struct
uvc_video') is being used as the third arugment to memset().
pahole shows that prior to commit 9b91a6523078 ("usb: gadget: uvc:
increase worker prio to WQ_HIGHPRI"), 'struct video_device' and
'struct ucv_video' had the same size, meaning that the argument to
sizeof() is incorrect semantically but there is no visible issue:
$ pahole -s build/drivers/usb/gadget/function/f_uvc.o | grep -E "(uvc_video|video_device)\s+"
video_device 1400 4
uvc_video 1400 3
After that change, uvc_video becomes slightly larger, meaning that the
memset() will overwrite by 8 bytes:
$ pahole -s build/drivers/usb/gadget/function/f_uvc.o | grep -E "(uvc_video|video_device)\s+"
video_device 1400 4
uvc_video 1408 3
Fix the arugment to sizeof() so that there is no overwrite.
Cc: stable@vger.kernel.org
Fixes: e4ce9ed835bc ("usb: gadget: uvc: ensure the vdev is unset")
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
---
drivers/usb/gadget/function/f_uvc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 71669e0e4d00..86bb0098fb66 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -421,7 +421,7 @@ uvc_register_video(struct uvc_device *uvc)
int ret;
/* TODO reference counting. */
- memset(&uvc->vdev, 0, sizeof(uvc->video));
+ memset(&uvc->vdev, 0, sizeof(uvc->vdev));
uvc->vdev.v4l2_dev = &uvc->v4l2_dev;
uvc->vdev.v4l2_dev->dev = &cdev->gadget->dev;
uvc->vdev.fops = &uvc_v4l2_fops;
base-commit: f76349cf41451c5c42a99f18a9163377e4b364ff
--
2.37.3
On Wed, Sep 28, 2022 at 01:19:21PM -0700, Nathan Chancellor wrote: > When building s390 allmodconfig after commit 9b91a6523078 ("usb: gadget: > uvc: increase worker prio to WQ_HIGHPRI"), the following error occurs: > > In file included from ../include/linux/string.h:253, > from ../include/linux/bitmap.h:11, > from ../include/linux/cpumask.h:12, > from ../include/linux/smp.h:13, > from ../include/linux/lockdep.h:14, > from ../include/linux/rcupdate.h:29, > from ../include/linux/rculist.h:11, > from ../include/linux/pid.h:5, > from ../include/linux/sched.h:14, > from ../include/linux/ratelimit.h:6, > from ../include/linux/dev_printk.h:16, > from ../include/linux/device.h:15, > from ../drivers/usb/gadget/function/f_uvc.c:9: > In function ‘fortify_memset_chk’, > inlined from ‘uvc_register_video’ at ../drivers/usb/gadget/function/f_uvc.c:424:2: > ../include/linux/fortify-string.h:301:25: error: call to ‘__write_overflow_field’ declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning] > 301 | __write_overflow_field(p_size_field, size); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > This points to the memset() in uvc_register_video(). It is clear that > the argument to sizeof() is incorrect, as uvc->vdev (a 'struct > video_device') is being zeroed out but the size of uvc->video (a 'struct > uvc_video') is being used as the third arugment to memset(). > > pahole shows that prior to commit 9b91a6523078 ("usb: gadget: uvc: > increase worker prio to WQ_HIGHPRI"), 'struct video_device' and > 'struct ucv_video' had the same size, meaning that the argument to > sizeof() is incorrect semantically but there is no visible issue: > > $ pahole -s build/drivers/usb/gadget/function/f_uvc.o | grep -E "(uvc_video|video_device)\s+" > video_device 1400 4 > uvc_video 1400 3 > > After that change, uvc_video becomes slightly larger, meaning that the > memset() will overwrite by 8 bytes: > > $ pahole -s build/drivers/usb/gadget/function/f_uvc.o | grep -E "(uvc_video|video_device)\s+" > video_device 1400 4 > uvc_video 1408 3 > > Fix the arugment to sizeof() so that there is no overwrite. > > Cc: stable@vger.kernel.org > Fixes: e4ce9ed835bc ("usb: gadget: uvc: ensure the vdev is unset") > Signed-off-by: Nathan Chancellor <nathan@kernel.org> Thanks for tracking that down! Reviewed-by: Kees Cook <keescook@chromium.org> -- Kees Cook
Hi Nathan, Thank you for the patch. On Wed, Sep 28, 2022 at 01:19:21PM -0700, Nathan Chancellor wrote: > When building s390 allmodconfig after commit 9b91a6523078 ("usb: gadget: > uvc: increase worker prio to WQ_HIGHPRI"), the following error occurs: > > In file included from ../include/linux/string.h:253, > from ../include/linux/bitmap.h:11, > from ../include/linux/cpumask.h:12, > from ../include/linux/smp.h:13, > from ../include/linux/lockdep.h:14, > from ../include/linux/rcupdate.h:29, > from ../include/linux/rculist.h:11, > from ../include/linux/pid.h:5, > from ../include/linux/sched.h:14, > from ../include/linux/ratelimit.h:6, > from ../include/linux/dev_printk.h:16, > from ../include/linux/device.h:15, > from ../drivers/usb/gadget/function/f_uvc.c:9: > In function ‘fortify_memset_chk’, > inlined from ‘uvc_register_video’ at ../drivers/usb/gadget/function/f_uvc.c:424:2: > ../include/linux/fortify-string.h:301:25: error: call to ‘__write_overflow_field’ declared with attribute warning: detected write beyond size of field (1st parameter); maybe use struct_group()? [-Werror=attribute-warning] > 301 | __write_overflow_field(p_size_field, size); > | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > > This points to the memset() in uvc_register_video(). It is clear that > the argument to sizeof() is incorrect, as uvc->vdev (a 'struct > video_device') is being zeroed out but the size of uvc->video (a 'struct > uvc_video') is being used as the third arugment to memset(). > > pahole shows that prior to commit 9b91a6523078 ("usb: gadget: uvc: > increase worker prio to WQ_HIGHPRI"), 'struct video_device' and > 'struct ucv_video' had the same size, meaning that the argument to > sizeof() is incorrect semantically but there is no visible issue: > > $ pahole -s build/drivers/usb/gadget/function/f_uvc.o | grep -E "(uvc_video|video_device)\s+" > video_device 1400 4 > uvc_video 1400 3 > > After that change, uvc_video becomes slightly larger, meaning that the > memset() will overwrite by 8 bytes: > > $ pahole -s build/drivers/usb/gadget/function/f_uvc.o | grep -E "(uvc_video|video_device)\s+" > video_device 1400 4 > uvc_video 1408 3 > > Fix the arugment to sizeof() so that there is no overwrite. > > Cc: stable@vger.kernel.org > Fixes: e4ce9ed835bc ("usb: gadget: uvc: ensure the vdev is unset") > Signed-off-by: Nathan Chancellor <nathan@kernel.org> Good catch. Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> > --- > drivers/usb/gadget/function/f_uvc.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c > index 71669e0e4d00..86bb0098fb66 100644 > --- a/drivers/usb/gadget/function/f_uvc.c > +++ b/drivers/usb/gadget/function/f_uvc.c > @@ -421,7 +421,7 @@ uvc_register_video(struct uvc_device *uvc) > int ret; > > /* TODO reference counting. */ > - memset(&uvc->vdev, 0, sizeof(uvc->video)); > + memset(&uvc->vdev, 0, sizeof(uvc->vdev)); > uvc->vdev.v4l2_dev = &uvc->v4l2_dev; > uvc->vdev.v4l2_dev->dev = &cdev->gadget->dev; > uvc->vdev.fops = &uvc_v4l2_fops; > > base-commit: f76349cf41451c5c42a99f18a9163377e4b364ff -- Regards, Laurent Pinchart
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