lkml.org 
[lkml]   [2006]   [Oct]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] binfmt_elf: randomize PIE binaries (2nd try)
On Fri, Oct 20, 2006 at 02:20:31PM +0200, Jesper Juhl wrote:
> On 20/10/06, Marcus Meissner <meissner@suse.de> wrote:
> >Randomizes -pie compiled binaries from PAGE_SIZE up to
> >ELF_ET_DYN_BASE.
> >
> >0 -> PAGE_SIZE is excluded to allow NULL ptr accesses
> >to fail.
> >
> >Signed-off-by: Marcus Meissner <meissner@suse.de>
> >
> >----
> > binfmt_elf.c | 8 +++++++-
> > 1 file changed, 7 insertions(+), 1 deletion(-)
> >
> >--- linux-2.6.18/fs/binfmt_elf.c.xx 2006-10-20 10:42:03.000000000 +0200
> >+++ linux-2.6.18/fs/binfmt_elf.c 2006-10-20 10:51:27.000000000 +0200
> >@@ -856,7 +856,13 @@
> > * default mmap base, as well as whatever program
> > they
> > * might try to exec. This is because the brk will
> > * follow the loader, and is not movable. */
> >- load_bias = ELF_PAGESTART(ELF_ET_DYN_BASE - vaddr);
> >+ if (current->flags & PF_RANDOMIZE)
> >+ load_bias = randomize_range(PAGE_SIZE,
> >+
> >ELF_ET_DYN_BASE,
> >+ 0);
>
> How about putting the two lines above on one line? ^^^^^

My editor said it would end at column 80. Starting from 0 it would col 79
actually, but I did not want to risk it.

Ciao, Marcus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-10-20 14:35    [W:0.055 / U:0.100 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site