<s>
kernel.org	B-Application
is	O
the	O
main	O
distribution	O
point	O
of	O
source	O
code	O
for	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
which	O
is	O
the	O
base	O
of	O
the	O
Linux	B-Application
operating	I-Application
system	I-Application
.	O
</s>
<s>
The	O
website	O
and	O
related	O
infrastructure	O
,	O
which	O
are	O
operated	O
by	O
the	O
Linux	B-Application
Kernel	I-Application
Organization	I-Application
,	O
host	O
the	O
repositories	B-General_Concept
that	O
make	O
all	O
versions	O
of	O
the	O
kernel	B-Operating_System
's	O
source	O
code	O
available	O
to	O
all	O
users	O
.	O
</s>
<s>
The	O
main	O
purpose	O
of	O
kernel.org	B-Application
is	O
to	O
host	O
repositories	B-General_Concept
used	O
by	O
Linux	B-Operating_System
kernel	I-Operating_System
developers	O
and	O
maintainers	O
of	O
various	O
Linux	B-Application
distributions	I-Application
.	O
</s>
<s>
Additionally	O
,	O
it	O
hosts	O
various	O
other	O
projects	O
or	O
their	O
mirrors	O
,	O
including	O
the	O
Linux	B-Application
Documentation	O
Project	O
(	O
LDP	O
)	O
and	O
CPAN	B-Language
.	O
</s>
<s>
Since	O
August	O
2014	O
,	O
kernel.org	B-Application
provides	O
additional	O
security	O
by	O
mandating	O
two-factor	O
authentication	O
for	O
commits	B-Language
performed	O
to	O
hosted	O
Git	B-Application
repositories	B-General_Concept
that	O
contain	O
source	O
code	O
of	O
the	O
Linux	B-Operating_System
kernel	I-Operating_System
,	O
with	O
support	O
for	O
both	O
soft	O
tokens	O
and	O
hard	O
tokens	O
.	O
</s>
<s>
On	O
28	O
August	O
2011	O
,	O
developers	O
at	O
kernel.org	B-Application
realized	O
that	O
there	O
had	O
been	O
a	O
major	O
security	O
breach	O
.	O
</s>
<s>
It	O
is	O
likely	O
,	O
although	O
not	O
confirmed	O
,	O
that	O
the	O
kernel.org	B-Application
intrusion	O
is	O
related	O
to	O
the	O
intrusions	O
of	O
LinuxFoundation.org	B-Operating_System
and	O
Linux.com	B-Application
websites	O
that	O
were	O
determined	O
shortly	O
afterwards	O
.	O
</s>
<s>
Git	B-Application
,	O
a	O
distributed	O
and	O
open-source	O
source	O
management	O
system	O
designed	O
by	O
Linus	O
Torvalds	O
to	O
guarantee	O
the	O
integrity	O
of	O
the	O
source	O
code	O
,	O
is	O
used	O
to	O
keep	O
track	O
of	O
changes	O
in	O
the	O
Linux	B-Application
source	O
code	O
.	O
</s>
<s>
All	O
that	O
makes	O
kernel.org	B-Application
not	O
the	O
primary	O
repository	B-General_Concept
,	O
but	O
rather	O
a	O
distribution	O
point	O
of	O
the	O
kernel	B-Operating_System
sources	O
.	O
</s>
<s>
Kernel.org	B-Application
was	O
back	O
online	O
by	O
November	O
2011	O
,	O
with	O
the	O
exception	O
of	O
a	O
few	O
secondary	O
services	O
.	O
</s>
