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Date: Thu, 19 Oct 2006 16:35:47 +0200 From: Marcus Meissner <meissner@...e.de> To: linux-kernel@...r.kernel.org, akpm@...l.org Subject: [PATCH] binfmt_elf: randomize PIE binaries Randomizes -pie compiled binaries over the whole address range from 0 up to ELF_ET_DYN_BASE. Signed-off-by: Marcus Meissner <meissner@...e.de> ---- 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, - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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