Messages in this thread Patch in this message | | | Date | Tue, 14 Nov 2006 13:26:25 +0100 | From | Marcus Meissner <> | Subject | PATCH: binfmt_elf: randomize PIE binaries (3rd try) |
| |
Randomizes -pie compiled binaries from 64k (0x10000) up to ELF_ET_DYN_BASE.
0 -> 64k is excluded to allow NULL ptr array accesses to fail.
Signed-off-by: Marcus Meissner <meissner@suse.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Dave Jones <davej@codemonkey.org.uk> Cc: Arjan van de Ven <arjan@linux.intel.com>
---- 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(0x10000, + ELF_ET_DYN_BASE, + 0); + else + load_bias = ELF_ET_DYN_BASE; + load_bias = ELF_PAGESTART(load_bias - vaddr); } error = elf_map(bprm->file, load_bias + vaddr, elf_ppnt, - 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/
| |