Messages in this thread | | | Date | Fri, 20 Oct 2006 14:32:33 +0200 | From | Marcus Meissner <> | Subject | Re: [PATCH] binfmt_elf: randomize PIE binaries (2nd try) |
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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.
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