openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[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>
This commit is contained in:
Marcus Meissner 2006-12-06 20:36:24 -08:00 committed by Linus Torvalds
parent b23984d0a1
commit 59287c0913
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/binfmt_elf.c
View File

@ -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,