Benjamin Herrenschmidt writes:
> Maybe a better fix is to force alignment in the kernel by requesting
> size + 64k - 4k and aligning it.
Sure you are right.
Andreas.
>From b9441a3d2148d439e2730def3222a7b70dccc432 Mon Sep 17 00:00:00 2001
From: Andreas Schwab
Date: Sun, 4 Oct 2009 14:29:04 +02
On Sat, 2009-10-03 at 16:51 +0200, Andreas Schwab wrote:
> Andreas Schwab writes:
>
> > Andreas Schwab writes:
> >
> >> Anton Blanchard writes:
> >>
> >>> On 64bit applications the VDSO is the only thing in segment 0. Since the
> >>> VDSO
> >>> is position independent we can remove the hint an
Andreas Schwab writes:
> Andreas Schwab writes:
>
>> Anton Blanchard writes:
>>
>>> On 64bit applications the VDSO is the only thing in segment 0. Since the
>>> VDSO
>>> is position independent we can remove the hint and let get_unmapped_area
>>> pick
>>> an area.
>>
>> This breaks gdb. The
Andreas Schwab writes:
> Anton Blanchard writes:
>
>> On 64bit applications the VDSO is the only thing in segment 0. Since the VDSO
>> is position independent we can remove the hint and let get_unmapped_area pick
>> an area.
>
> This breaks gdb. The section table in the VDSO image when mapped i
Anton Blanchard writes:
> On 64bit applications the VDSO is the only thing in segment 0. Since the VDSO
> is position independent we can remove the hint and let get_unmapped_area pick
> an area.
This breaks gdb. The section table in the VDSO image when mapped into
the process no longer contains
Hi Ben,
> Don't we lose randomization ? Or do we randomize the whole mem map
> nowadays ?
The start of the top down mmap region is randomized, so the VDSO will be in a
different position each time. A quick example:
run 1:
fffb01f6000-fffb01f9000 r-xp 00:00 0 [vdso]
fffb01f9000
On 64bit applications the VDSO is the only thing in segment 0. Since the VDSO
is position independent we can remove the hint and let get_unmapped_area pick
an area. This will mean the vdso will be near other mmaps and will share
an SLB entry:
1000-10001000 r-xp 08:06 5778459/r
On Tue, 2009-07-14 at 16:53 +1000, Anton Blanchard wrote:
> plain text document attachment (move_vdso_v2)
> On 64bit applications the VDSO is the only thing in segment 0. Since the VDSO
> is position independent we can remove the hint and let get_unmapped_area pick
> an area. This will mean the vds
