Messages in this thread | | | Date | Fri, 20 Oct 2006 14:20:31 +0200 | From | "Jesper Juhl" <> | Subject | Re: [PATCH] binfmt_elf: randomize PIE binaries (2nd try) |
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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> Don't top-post http://www.catb.org/~esr/jargon/html/T/top-post.html Plain text mails only, please http://www.expita.com/nomime.html - 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/
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