Randomizes -pie compiled binaries over the whole address
range from 0 up to ELF_ET_DYN_BASE.
Signed-off-by: Marcus Meissner <[email protected]>
----
binfmt_elf.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
--- linux-2.6.18/fs/binfmt_elf.c.xx 2006-10-19 11:21:49.000000000 +0200
+++ linux-2.6.18/fs/binfmt_elf.c 2006-10-19 11:24:58.000000000 +0200
@@ -856,7 +856,12 @@ static int load_elf_binary(struct linux_
* 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(0, ELF_ET_DYN_BASE,
+ vaddr);
+ else
+ load_bias = ELF_ET_DYN_BASE - vaddr;
+ load_bias = ELF_PAGESTART(load_bias);
}
error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt,
-
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