<s>
In	O
computing	O
,	O
rebasing	B-Library
is	O
the	O
process	O
of	O
modifying	O
data	O
based	O
on	O
one	O
reference	O
to	O
another	O
.	O
</s>
<s>
Rebasing	B-Library
is	O
the	O
process	O
of	O
creating	O
a	O
shared	O
library	O
image	O
in	O
such	O
a	O
way	O
that	O
it	O
is	O
guaranteed	O
to	O
use	O
virtual	B-Architecture
memory	I-Architecture
without	O
conflicting	O
with	O
any	O
other	O
shared	B-Library
libraries	I-Library
loadable	O
in	O
the	O
system	O
.	O
</s>
<s>
IBM	O
VM/370	B-Application
discontinuous	O
saved	O
segments	O
(	O
DCSS	O
)	O
were	O
an	O
early	O
example	O
of	O
this	O
technique	O
,	O
though	O
not	O
called	O
rebasing	B-Library
.	O
</s>
<s>
The	O
technique	O
is	O
used	O
extensively	O
on	O
Win32	B-Library
platforms	O
to	O
avoid	O
the	O
overhead	O
of	O
address	O
relocation	B-Library
of	O
system	O
DLLs	O
by	O
the	O
loader	O
.	O
</s>
<s>
Some	O
security	O
extensions	O
to	O
Linux/x86	O
use	O
rebasing	B-Library
to	O
force	O
the	O
use	O
of	O
code	O
addresses	O
below	O
0x00ffffff	O
in	O
order	O
to	O
introduce	O
a	O
0x00	O
byte	O
into	O
all	O
code	O
pointers	O
;	O
This	O
eliminates	O
a	O
certain	O
class	O
of	O
buffer	B-General_Concept
overflow	I-General_Concept
security	O
problems	O
related	O
to	O
improper	O
checking	O
of	O
null-terminated	B-Data_Structure
strings	I-Data_Structure
,	O
common	O
in	O
the	O
C	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
Rebasing	B-Library
is	O
the	O
act	O
of	O
moving	O
changesets	B-Protocol
to	O
a	O
different	O
branch	B-General_Concept
when	O
using	O
a	O
revision	B-Architecture
control	I-Architecture
system	I-Architecture
or	O
in	O
some	O
systems	O
,	O
by	O
synchronizing	O
a	O
branch	B-General_Concept
with	O
the	O
originating	O
branch	B-General_Concept
by	O
merging	O
all	O
new	O
changes	O
in	O
the	O
latter	O
to	O
the	O
former	O
.	O
</s>
<s>
For	O
example	O
,	O
Git	B-Application
and	O
Darcs	B-Protocol
do	O
this	O
(	O
but	O
Darcs	B-Protocol
extends	O
the	O
concept	O
and	O
calls	O
it	O
"	O
patch	O
commutation	O
"	O
)	O
.	O
</s>
<s>
The	O
mechanism	O
that	O
the	O
Microsoft	B-Operating_System
Exchange	I-Operating_System
or	O
Outlook	B-Application
daylight	O
saving	O
time	O
(	O
DST	O
)	O
rebasing	B-Library
tool	O
TZMOVE.EXE	O
uses	O
to	O
recalculate	O
and	O
reschedule	O
appointment	O
dates	O
that	O
are	O
affected	O
by	O
DST	O
.	O
</s>
