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Date:   Wed, 27 Sep 2023 15:40:09 +0000
To:     Bagas Sanjaya <bagasdotme@gmail.com>
From:   Turritopsis Dohrnii Teo En Ming <tdtem@protonmail.com>
Cc:     Turritopsis Dohrnii Teo En Ming <teo.en.ming@protonmail.com>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        ceo@teo-en-ming-corp.com
Subject: Re: My brand new vivo V25 Pro 5G Android mobile phone is running on Linux kernel 4.19.191+
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------- Original Message -------
On Friday, September 22nd, 2023 at 8:51 AM, Bagas Sanjaya <bagasdotme@gmail=
.com> wrote:


> [trimming personal and obvious political info]
>=20
> On Thu, Sep 21, 2023 at 04:20:06PM +0000, Turritopsis Dohrnii Teo En Ming=
 wrote:
>=20
> > My brand new vivo V25 Pro 5G Android mobile phone is running on Linux k=
ernel 4.19.191+. Are there any severe/critical security vulnerabilities in =
Linux kernel 4.19.191+ that will allow government-sponsored or state-backed=
 hackers or Advanced Persistent Threats (APTs) to take over absolute contro=
l of my brand new vivo mobile phone? Can I download, compile and install th=
e latest Linux kernel 6.5.4 from sources on my brand new vivo mobile phone =
by myself? I would like to know how I can do it.
>=20
>=20
> There are Android Security Bulletin listings on [1], with vivo-specific
> bulletins can be found at [2].
>=20
> For building kernels, you can follow official Android guide [3]. Or
> you can also visit XDA forums [4] where people posted their own custom
> kernels. But usually your vendor (vivo) takes care of kernel updates
> anyway.

So if I want to build the latest Linux kernel 6.5.4 for my vivo V25 Pro 5G =
mobile phone, I can follow the guides at link [3] and link [4].

>=20
> > I have decided to buy this vivo mobile phone because my Samsung Galaxy =
A32 5G mobile phone has now become extremely slow in performance and lags l=
ike hell. Maybe too many apps were installed.
>=20
>=20
> What are these apps besides built-in ones?

Besides the built-in apps, all the other apps come from Google Play Store. =
There is one exception though. The Douyin app was installed through an APK =
file and it does not come from Google Play Store.

>=20
> > Opening and using apps is now a slow and painful experience. The phone =
camera is even worse. Taking a photo or selfie takes 2-3 seconds. If you mo=
ve the phone by a bit before the 3 seconds is up, your photo or selfie will=
 turn out very blur. So you need to set a timer of 2 seconds when you take =
a selfie or photo. Taking videos with the phone camera is also very laggy a=
nd choppy. The recorded video will turn out to be choppy.
>=20
>=20
> What is your Samsung phone specification then?

My Samsung phone is the Samsung Galaxy A32 5G. The specs can be found on gs=
marena.com.

>=20
> Thanks.
>=20
> [1]: https://source.android.com/docs/security/bulletin/asb-overview
> [2]: https://www.vivo.com/en/security
> [3]: https://source.android.com/docs/setup/build/building-kernels
> [4]: https://forum.xda-developers.com
>
=20
Regards,

Mr. Turritopsis Dohrnii Teo En Ming
Targeted Individual in Singapore