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SubjectRe: [PATCH] binfmt_elf: randomize PIE binaries (2nd try)
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? ^^^^^

> + ELF_ET_DYN_BASE, 0);


--
Jesper Juhl <jesper.juhl@gmail.com>
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