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Message-ID: <20061114122625.GA25856@suse.de> Date: Tue, 14 Nov 2006 13:26:25 +0100 From: Marcus Meissner <meissner@...e.de> To: akpm@...l.org, linux-kernel@...r.kernel.org 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@...e.de> Cc: Ingo Molnar <mingo@...e.hu> Cc: Dave Jones <davej@...emonkey.org.uk> Cc: Arjan van de Ven <arjan@...ux.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@...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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