Re: CVE Request - Samsung Exynos GPU driver OOB read

[<cve-assign () mitre org>]

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA256

> http://security.samsungmobile.com/smrupdate.html#SMR-JAN-2017
> SVE-2016-6362: out of bound read in gpu driver
>
> Vulnerability in gpu driver does not properly check the boundary of
> buffers leading to a possible memory corruption.

> http://opensource.samsung.com/reception/receptionSub.do?method=sub&sub=F&searchValue=SM-G9200
> > there is no official git for tracking from Samsung

> > The bug itself resides in
> > <root>/drivers/gpu/arm/t7xx/r5p0/mali_kbase_core_linux.c of the src tree, in
> > function kbase_dispatch which is the main ioctl dispatcher of the driver:
> >
> > static mali_error kbase_dispatch(struct kbase_context *kctx, void * const
> > args, u32 args_size)
> > {
> > ...
> >     /* setup complete, perform normal operation */
> >
> >     switch (id) {
> > ...
> >         case KBASE_FUNC_TMU_SKIP:
> >                 {
> > /* MALI_SEC_INTEGRATION */
> > #ifdef CONFIG_SENSORS_SEC_THERMISTOR
> > #ifdef CONFIG_USE_VSYNC_SKIP
> >                         struct kbase_uk_tmu_skip *tskip = args;
> >                         int thermistor = sec_therm_get_ap_temperature();
> >                         u32 i, t_index = tskip->num_ratiometer;
> >
> >                         for (i = 0; i < tskip->num_ratiometer; i++) <== missing boundary check
> >                                 if (thermistor >= tskip->temperature[i])
> >                                         t_index = i;
> >
> > tskip->temperature is a uint32 array of static size(10 elements) and
> > tskip->num_ratiometer a uint32 which is user controlled. Since the boundary
> > check is missing, OOB read may happen leading to possible memory corruption.

Use CVE-2017-5538.

- -- 
CVE Assignment Team
M/S M300, 202 Burlington Road, Bedford, MA 01730 USA
[ A PGP key is available for encrypted communications at
  http://cve.mitre.org/cve/request_id.html ]
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
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=UjQq
-----END PGP SIGNATURE-----