* Re: [PATCH v2] Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper().
@ 2018-01-31 15:49 ` Mathieu Malaterre
0 siblings, 0 replies; 11+ messages in thread
From: Mathieu Malaterre @ 2018-01-31 15:49 UTC (permalink / raw)
To: Peter Malone
Cc: Linux Fbdev development list, Bartlomiej Zolnierkiewicz,
dri-devel, linux-kernel
Hi Peter,
On Wed, Jan 31, 2018 at 3:57 PM, Peter Malone <peter.malone@gmail.com> wrote:
> Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in
> sbusfb_ioctl_helper().
>
> 'index' is defined as an int in sbusfb_ioctl_helper().
> We retrieve this from the user:
> if (get_user(index, &c->index) ||
> __get_user(count, &c->count) ||
> __get_user(ured, &c->red) ||
> __get_user(ugreen, &c->green) ||
> __get_user(ublue, &c->blue))
> return -EFAULT;
>
> and then we use 'index' in the following way:
> red = cmap->red[index + i] >> 8;
> green = cmap->green[index + i] >> 8;
> blue = cmap->blue[index + i] >> 8;
>
> This is a classic information leak vulnerability. 'index' should be
> an unsigned int, given its usage above.
>
> This patch is straight-forward; it changes 'index' to unsigned int
> in two switch-cases: FBIOGETCMAP_SPARC && FBIOPUTCMAP_SPARC.
>
> Signed-off-by: Peter Malone <peter.malone@gmail.com>
> ---
much better :)
> v2: fixed formatting
>
> drivers/video/fbdev/sbuslib.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/video/fbdev/sbuslib.c b/drivers/video/fbdev/sbuslib.c
> index af6fc97f4ba4..a436d44f1b7f 100644
> --- a/drivers/video/fbdev/sbuslib.c
> +++ b/drivers/video/fbdev/sbuslib.c
> @@ -122,7 +122,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
> unsigned char __user *ured;
> unsigned char __user *ugreen;
> unsigned char __user *ublue;
> - int index, count, i;
> + unsigned int index, count, i;
>
> if (get_user(index, &c->index) ||
> __get_user(count, &c->count) ||
> @@ -161,7 +161,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
> unsigned char __user *ugreen;
> unsigned char __user *ublue;
> struct fb_cmap *cmap = &info->cmap;
> - int index, count, i;
> + unsigned int index, count, i;
> u8 red, green, blue;
>
> if (get_user(index, &c->index) ||
> --
> 2.14.3
>
By just looking at the code and commit message:
Acked-by: Mathieu Malaterre <malat@debian.org>
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2] Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper().
2018-01-31 15:49 ` Mathieu Malaterre
(?)
@ 2018-02-04 14:12 ` Peter Malone
-1 siblings, 0 replies; 11+ messages in thread
From: Peter Malone @ 2018-02-04 14:12 UTC (permalink / raw)
To: Mathieu Malaterre
Cc: Linux Fbdev development list, linux-kernel, dri-devel,
Bartlomiej Zolnierkiewicz
[-- Attachment #1.1: Type: text/plain, Size: 2694 bytes --]
Hi folks,
CVE-2018-6412 has been created for this. Is it possible for you to add a
note indicating the CVE number when merging the patch?
I received the CVE number after the patch was created and ack'd, which is
why I didn't include it in the commit message.
On Jan 31, 2018 10:49, "Mathieu Malaterre" <malat@debian.org> wrote:
> Hi Peter,
>
> On Wed, Jan 31, 2018 at 3:57 PM, Peter Malone <peter.malone@gmail.com>
> wrote:
> > Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in
> > sbusfb_ioctl_helper().
> >
> > 'index' is defined as an int in sbusfb_ioctl_helper().
> > We retrieve this from the user:
> > if (get_user(index, &c->index) ||
> > __get_user(count, &c->count) ||
> > __get_user(ured, &c->red) ||
> > __get_user(ugreen, &c->green) ||
> > __get_user(ublue, &c->blue))
> > return -EFAULT;
> >
> > and then we use 'index' in the following way:
> > red = cmap->red[index + i] >> 8;
> > green = cmap->green[index + i] >> 8;
> > blue = cmap->blue[index + i] >> 8;
> >
> > This is a classic information leak vulnerability. 'index' should be
> > an unsigned int, given its usage above.
> >
> > This patch is straight-forward; it changes 'index' to unsigned int
> > in two switch-cases: FBIOGETCMAP_SPARC && FBIOPUTCMAP_SPARC.
> >
> > Signed-off-by: Peter Malone <peter.malone@gmail.com>
> > ---
>
> much better :)
>
> > v2: fixed formatting
> >
> > drivers/video/fbdev/sbuslib.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/video/fbdev/sbuslib.c
> b/drivers/video/fbdev/sbuslib.c
> > index af6fc97f4ba4..a436d44f1b7f 100644
> > --- a/drivers/video/fbdev/sbuslib.c
> > +++ b/drivers/video/fbdev/sbuslib.c
> > @@ -122,7 +122,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned
> long arg,
> > unsigned char __user *ured;
> > unsigned char __user *ugreen;
> > unsigned char __user *ublue;
> > - int index, count, i;
> > + unsigned int index, count, i;
> >
> > if (get_user(index, &c->index) ||
> > __get_user(count, &c->count) ||
> > @@ -161,7 +161,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned
> long arg,
> > unsigned char __user *ugreen;
> > unsigned char __user *ublue;
> > struct fb_cmap *cmap = &info->cmap;
> > - int index, count, i;
> > + unsigned int index, count, i;
> > u8 red, green, blue;
> >
> > if (get_user(index, &c->index) ||
> > --
> > 2.14.3
> >
>
> By just looking at the code and commit message:
>
> Acked-by: Mathieu Malaterre <malat@debian.org>
>
[-- Attachment #1.2: Type: text/html, Size: 3913 bytes --]
[-- Attachment #2: Type: text/plain, Size: 160 bytes --]
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2] Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper().
2018-01-31 15:49 ` Mathieu Malaterre
@ 2018-02-04 14:18 ` Peter Malone
-1 siblings, 0 replies; 11+ messages in thread
From: Peter Malone @ 2018-02-04 14:18 UTC (permalink / raw)
To: Mathieu Malaterre
Cc: Linux Fbdev development list, Bartlomiej Zolnierkiewicz,
dri-devel, linux-kernel
Hi folks,
CVE-2018-6412 has been created for this. Is it possible for you to add
a note indicating the CVE number when merging the patch?
I received the CVE number after the patch was created and ack'd, which
is why I didn't include it in the commit message.
On Wed, Jan 31, 2018 at 10:49 AM, Mathieu Malaterre <malat@debian.org> wrote:
> Hi Peter,
>
> On Wed, Jan 31, 2018 at 3:57 PM, Peter Malone <peter.malone@gmail.com> wrote:
>> Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in
>> sbusfb_ioctl_helper().
>>
>> 'index' is defined as an int in sbusfb_ioctl_helper().
>> We retrieve this from the user:
>> if (get_user(index, &c->index) ||
>> __get_user(count, &c->count) ||
>> __get_user(ured, &c->red) ||
>> __get_user(ugreen, &c->green) ||
>> __get_user(ublue, &c->blue))
>> return -EFAULT;
>>
>> and then we use 'index' in the following way:
>> red = cmap->red[index + i] >> 8;
>> green = cmap->green[index + i] >> 8;
>> blue = cmap->blue[index + i] >> 8;
>>
>> This is a classic information leak vulnerability. 'index' should be
>> an unsigned int, given its usage above.
>>
>> This patch is straight-forward; it changes 'index' to unsigned int
>> in two switch-cases: FBIOGETCMAP_SPARC && FBIOPUTCMAP_SPARC.
>>
>> Signed-off-by: Peter Malone <peter.malone@gmail.com>
>> ---
>
> much better :)
>
>> v2: fixed formatting
>>
>> drivers/video/fbdev/sbuslib.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/video/fbdev/sbuslib.c b/drivers/video/fbdev/sbuslib.c
>> index af6fc97f4ba4..a436d44f1b7f 100644
>> --- a/drivers/video/fbdev/sbuslib.c
>> +++ b/drivers/video/fbdev/sbuslib.c
>> @@ -122,7 +122,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
>> unsigned char __user *ured;
>> unsigned char __user *ugreen;
>> unsigned char __user *ublue;
>> - int index, count, i;
>> + unsigned int index, count, i;
>>
>> if (get_user(index, &c->index) ||
>> __get_user(count, &c->count) ||
>> @@ -161,7 +161,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
>> unsigned char __user *ugreen;
>> unsigned char __user *ublue;
>> struct fb_cmap *cmap = &info->cmap;
>> - int index, count, i;
>> + unsigned int index, count, i;
>> u8 red, green, blue;
>>
>> if (get_user(index, &c->index) ||
>> --
>> 2.14.3
>>
>
> By just looking at the code and commit message:
>
> Acked-by: Mathieu Malaterre <malat@debian.org>
--
Regards,
Peter.
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2] Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper().
@ 2018-02-04 14:18 ` Peter Malone
0 siblings, 0 replies; 11+ messages in thread
From: Peter Malone @ 2018-02-04 14:18 UTC (permalink / raw)
To: Mathieu Malaterre
Cc: Linux Fbdev development list, Bartlomiej Zolnierkiewicz,
dri-devel, linux-kernel
Hi folks,
CVE-2018-6412 has been created for this. Is it possible for you to add
a note indicating the CVE number when merging the patch?
I received the CVE number after the patch was created and ack'd, which
is why I didn't include it in the commit message.
On Wed, Jan 31, 2018 at 10:49 AM, Mathieu Malaterre <malat@debian.org> wrote:
> Hi Peter,
>
> On Wed, Jan 31, 2018 at 3:57 PM, Peter Malone <peter.malone@gmail.com> wrote:
>> Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in
>> sbusfb_ioctl_helper().
>>
>> 'index' is defined as an int in sbusfb_ioctl_helper().
>> We retrieve this from the user:
>> if (get_user(index, &c->index) ||
>> __get_user(count, &c->count) ||
>> __get_user(ured, &c->red) ||
>> __get_user(ugreen, &c->green) ||
>> __get_user(ublue, &c->blue))
>> return -EFAULT;
>>
>> and then we use 'index' in the following way:
>> red = cmap->red[index + i] >> 8;
>> green = cmap->green[index + i] >> 8;
>> blue = cmap->blue[index + i] >> 8;
>>
>> This is a classic information leak vulnerability. 'index' should be
>> an unsigned int, given its usage above.
>>
>> This patch is straight-forward; it changes 'index' to unsigned int
>> in two switch-cases: FBIOGETCMAP_SPARC && FBIOPUTCMAP_SPARC.
>>
>> Signed-off-by: Peter Malone <peter.malone@gmail.com>
>> ---
>
> much better :)
>
>> v2: fixed formatting
>>
>> drivers/video/fbdev/sbuslib.c | 4 ++--
>> 1 file changed, 2 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/video/fbdev/sbuslib.c b/drivers/video/fbdev/sbuslib.c
>> index af6fc97f4ba4..a436d44f1b7f 100644
>> --- a/drivers/video/fbdev/sbuslib.c
>> +++ b/drivers/video/fbdev/sbuslib.c
>> @@ -122,7 +122,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
>> unsigned char __user *ured;
>> unsigned char __user *ugreen;
>> unsigned char __user *ublue;
>> - int index, count, i;
>> + unsigned int index, count, i;
>>
>> if (get_user(index, &c->index) ||
>> __get_user(count, &c->count) ||
>> @@ -161,7 +161,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
>> unsigned char __user *ugreen;
>> unsigned char __user *ublue;
>> struct fb_cmap *cmap = &info->cmap;
>> - int index, count, i;
>> + unsigned int index, count, i;
>> u8 red, green, blue;
>>
>> if (get_user(index, &c->index) ||
>> --
>> 2.14.3
>>
>
> By just looking at the code and commit message:
>
> Acked-by: Mathieu Malaterre <malat@debian.org>
--
Regards,
Peter.
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2] Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper().
2018-02-04 14:18 ` Peter Malone
@ 2018-03-07 13:03 ` Bartlomiej Zolnierkiewicz
-1 siblings, 0 replies; 11+ messages in thread
From: Bartlomiej Zolnierkiewicz @ 2018-03-07 13:03 UTC (permalink / raw)
To: Peter Malone
Cc: Mathieu Malaterre, Linux Fbdev development list, dri-devel, linux-kernel
On Sunday, February 04, 2018 09:18:03 AM Peter Malone wrote:
> Hi folks,
Hi,
> CVE-2018-6412 has been created for this. Is it possible for you to add
> a note indicating the CVE number when merging the patch?
>
> I received the CVE number after the patch was created and ack'd, which
> is why I didn't include it in the commit message.
I queued the patch (with Mathieu's ACK and CVE number added to the patch
description) for v4.16, thanks.
> On Wed, Jan 31, 2018 at 10:49 AM, Mathieu Malaterre <malat@debian.org> wrote:
> > Hi Peter,
> >
> > On Wed, Jan 31, 2018 at 3:57 PM, Peter Malone <peter.malone@gmail.com> wrote:
> >> Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in
> >> sbusfb_ioctl_helper().
> >>
> >> 'index' is defined as an int in sbusfb_ioctl_helper().
> >> We retrieve this from the user:
> >> if (get_user(index, &c->index) ||
> >> __get_user(count, &c->count) ||
> >> __get_user(ured, &c->red) ||
> >> __get_user(ugreen, &c->green) ||
> >> __get_user(ublue, &c->blue))
> >> return -EFAULT;
> >>
> >> and then we use 'index' in the following way:
> >> red = cmap->red[index + i] >> 8;
> >> green = cmap->green[index + i] >> 8;
> >> blue = cmap->blue[index + i] >> 8;
> >>
> >> This is a classic information leak vulnerability. 'index' should be
> >> an unsigned int, given its usage above.
> >>
> >> This patch is straight-forward; it changes 'index' to unsigned int
> >> in two switch-cases: FBIOGETCMAP_SPARC && FBIOPUTCMAP_SPARC.
> >>
> >> Signed-off-by: Peter Malone <peter.malone@gmail.com>
> >> ---
> >
> > much better :)
> >
> >> v2: fixed formatting
> >>
> >> drivers/video/fbdev/sbuslib.c | 4 ++--
> >> 1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/video/fbdev/sbuslib.c b/drivers/video/fbdev/sbuslib.c
> >> index af6fc97f4ba4..a436d44f1b7f 100644
> >> --- a/drivers/video/fbdev/sbuslib.c
> >> +++ b/drivers/video/fbdev/sbuslib.c
> >> @@ -122,7 +122,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
> >> unsigned char __user *ured;
> >> unsigned char __user *ugreen;
> >> unsigned char __user *ublue;
> >> - int index, count, i;
> >> + unsigned int index, count, i;
> >>
> >> if (get_user(index, &c->index) ||
> >> __get_user(count, &c->count) ||
> >> @@ -161,7 +161,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
> >> unsigned char __user *ugreen;
> >> unsigned char __user *ublue;
> >> struct fb_cmap *cmap = &info->cmap;
> >> - int index, count, i;
> >> + unsigned int index, count, i;
> >> u8 red, green, blue;
> >>
> >> if (get_user(index, &c->index) ||
> >> --
> >> 2.14.3
> >>
> >
> > By just looking at the code and commit message:
> >
> > Acked-by: Mathieu Malaterre <malat@debian.org>
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
^ permalink raw reply [flat|nested] 11+ messages in thread
* Re: [PATCH v2] Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in sbusfb_ioctl_helper().
@ 2018-03-07 13:03 ` Bartlomiej Zolnierkiewicz
0 siblings, 0 replies; 11+ messages in thread
From: Bartlomiej Zolnierkiewicz @ 2018-03-07 13:03 UTC (permalink / raw)
To: Peter Malone
Cc: Mathieu Malaterre, Linux Fbdev development list, dri-devel, linux-kernel
On Sunday, February 04, 2018 09:18:03 AM Peter Malone wrote:
> Hi folks,
Hi,
> CVE-2018-6412 has been created for this. Is it possible for you to add
> a note indicating the CVE number when merging the patch?
>
> I received the CVE number after the patch was created and ack'd, which
> is why I didn't include it in the commit message.
I queued the patch (with Mathieu's ACK and CVE number added to the patch
description) for v4.16, thanks.
> On Wed, Jan 31, 2018 at 10:49 AM, Mathieu Malaterre <malat@debian.org> wrote:
> > Hi Peter,
> >
> > On Wed, Jan 31, 2018 at 3:57 PM, Peter Malone <peter.malone@gmail.com> wrote:
> >> Fixing arbitrary kernel leak in case FBIOGETCMAP_SPARC in
> >> sbusfb_ioctl_helper().
> >>
> >> 'index' is defined as an int in sbusfb_ioctl_helper().
> >> We retrieve this from the user:
> >> if (get_user(index, &c->index) ||
> >> __get_user(count, &c->count) ||
> >> __get_user(ured, &c->red) ||
> >> __get_user(ugreen, &c->green) ||
> >> __get_user(ublue, &c->blue))
> >> return -EFAULT;
> >>
> >> and then we use 'index' in the following way:
> >> red = cmap->red[index + i] >> 8;
> >> green = cmap->green[index + i] >> 8;
> >> blue = cmap->blue[index + i] >> 8;
> >>
> >> This is a classic information leak vulnerability. 'index' should be
> >> an unsigned int, given its usage above.
> >>
> >> This patch is straight-forward; it changes 'index' to unsigned int
> >> in two switch-cases: FBIOGETCMAP_SPARC && FBIOPUTCMAP_SPARC.
> >>
> >> Signed-off-by: Peter Malone <peter.malone@gmail.com>
> >> ---
> >
> > much better :)
> >
> >> v2: fixed formatting
> >>
> >> drivers/video/fbdev/sbuslib.c | 4 ++--
> >> 1 file changed, 2 insertions(+), 2 deletions(-)
> >>
> >> diff --git a/drivers/video/fbdev/sbuslib.c b/drivers/video/fbdev/sbuslib.c
> >> index af6fc97f4ba4..a436d44f1b7f 100644
> >> --- a/drivers/video/fbdev/sbuslib.c
> >> +++ b/drivers/video/fbdev/sbuslib.c
> >> @@ -122,7 +122,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
> >> unsigned char __user *ured;
> >> unsigned char __user *ugreen;
> >> unsigned char __user *ublue;
> >> - int index, count, i;
> >> + unsigned int index, count, i;
> >>
> >> if (get_user(index, &c->index) ||
> >> __get_user(count, &c->count) ||
> >> @@ -161,7 +161,7 @@ int sbusfb_ioctl_helper(unsigned long cmd, unsigned long arg,
> >> unsigned char __user *ugreen;
> >> unsigned char __user *ublue;
> >> struct fb_cmap *cmap = &info->cmap;
> >> - int index, count, i;
> >> + unsigned int index, count, i;
> >> u8 red, green, blue;
> >>
> >> if (get_user(index, &c->index) ||
> >> --
> >> 2.14.3
> >>
> >
> > By just looking at the code and commit message:
> >
> > Acked-by: Mathieu Malaterre <malat@debian.org>
Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics
^ permalink raw reply [flat|nested] 11+ messages in thread