From: Arjan van de Ven <arjan@infradead.org>
Introduce a personality that disables randomisation, so that users can use
setarch and related commands to run specific applications without
randomisation.
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/fs/binfmt_elf.c | 2 +-
25-akpm/include/linux/personality.h | 3 ++-
2 files changed, 3 insertions(+), 2 deletions(-)
diff -puN fs/binfmt_elf.c~randomisation-addr_no_randomize-personality fs/binfmt_elf.c
--- 25/fs/binfmt_elf.c~randomisation-addr_no_randomize-personality 2005-02-22 18:16:07.000000000 -0800
+++ 25-akpm/fs/binfmt_elf.c 2005-02-22 18:16:07.000000000 -0800
@@ -753,7 +753,7 @@ static int load_elf_binary(struct linux_
if (elf_read_implies_exec(loc->elf_ex, executable_stack))
current->personality |= READ_IMPLIES_EXEC;
- if (executable_stack == EXSTACK_DISABLE_X && randomize_va_space)
+ if ( !(current->personality & ADDR_NO_RANDOMIZE) && randomize_va_space)
current->flags |= PF_RANDOMIZE;
arch_pick_mmap_layout(current->mm);
diff -puN include/linux/personality.h~randomisation-addr_no_randomize-personality include/linux/personality.h
--- 25/include/linux/personality.h~randomisation-addr_no_randomize-personality 2005-02-22 18:16:07.000000000 -0800
+++ 25-akpm/include/linux/personality.h 2005-02-22 18:16:07.000000000 -0800
@@ -18,6 +18,7 @@ extern int __set_personality(unsigned l
* These occupy the top three bytes.
*/
enum {
+ ADDR_NO_RANDOMIZE = 0x0040000, /* disable randomization of VA space */
FDPIC_FUNCPTRS = 0x0080000, /* userspace function ptrs point to descriptors
* (signal handling)
*/
@@ -35,7 +36,7 @@ enum {
* Security-relevant compatibility flags that must be
* cleared upon setuid or setgid exec:
*/
-#define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC)
+#define PER_CLEAR_ON_SETID (READ_IMPLIES_EXEC|ADDR_NO_RANDOMIZE)
/*
* Personality types.
_