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| author | Marcus Meissner <meissner@suse.de> | 2006-12-06 20:36:24 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2006-12-07 08:39:33 -0800 |
| commit | 59287c0913cc9a6c75712a775f6c1c1ef418ef3b (patch) | |
| tree | 0f1c12edec9496275e2b2a373a12b1e9e2e91173 /fs/binfmt_elf.c | |
| parent | b23984d0a12a4821b2e9712c71550f321eb88bb5 (diff) | |
| download | op-kernel-dev-59287c0913cc9a6c75712a775f6c1c1ef418ef3b.zip op-kernel-dev-59287c0913cc9a6c75712a775f6c1c1ef418ef3b.tar.gz | |
[PATCH] binfmt_elf: randomize PIE binaries (2nd try)
Randomizes -pie compiled binaries from 64k (0x10000) up to ELF_ET_DYN_BASE.
0 -> 64k is excluded to allow NULL ptr 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>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/binfmt_elf.c')
| -rw-r--r-- | fs/binfmt_elf.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c index cc72bb4..b2efbae 100644 --- a/fs/binfmt_elf.c +++ b/fs/binfmt_elf.c @@ -856,7 +856,13 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs) * 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, |
