diff options
| author | Suresh Siddha <suresh.b.siddha@intel.com> | 2005-06-21 17:14:32 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-06-21 18:46:12 -0700 |
| commit | 84929801e14d968caeb84795bfbb88f04283fbd9 (patch) | |
| tree | 248fa9fd6cfb411a6df3b7f7fb42aa4f9ceca2bf /include/asm-x86_64/a.out.h | |
| parent | 589777eab7360894b7ca1c4ba9d252e03b51225b (diff) | |
[PATCH] x86_64: TASK_SIZE fixes for compatibility mode processes
Appended patch will setup compatibility mode TASK_SIZE properly. This will
fix atleast three known bugs that can be encountered while running
compatibility mode apps.
a) A malicious 32bit app can have an elf section at 0xffffe000. During
exec of this app, we will have a memory leak as insert_vm_struct() is
not checking for return value in syscall32_setup_pages() and thus not
freeing the vma allocated for the vsyscall page. And instead of exec
failing (as it has addresses > TASK_SIZE), we were allowing it to
succeed previously.
b) With a 32bit app, hugetlb_get_unmapped_area/arch_get_unmapped_area
may return addresses beyond 32bits, ultimately causing corruption
because of wrap-around and resulting in SEGFAULT, instead of returning
ENOMEM.
c) 32bit app doing this below mmap will now fail.
mmap((void *)(0xFFFFE000UL), 0x10000UL, PROT_READ|PROT_WRITE,
MAP_FIXED|MAP_PRIVATE|MAP_ANON, 0, 0);
Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/asm-x86_64/a.out.h')
| -rw-r--r-- | include/asm-x86_64/a.out.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/asm-x86_64/a.out.h b/include/asm-x86_64/a.out.h index 5952914f412..7255cde0653 100644 --- a/include/asm-x86_64/a.out.h +++ b/include/asm-x86_64/a.out.h @@ -21,7 +21,7 @@ struct exec #ifdef __KERNEL__ #include <linux/thread_info.h> -#define STACK_TOP (test_thread_flag(TIF_IA32) ? IA32_PAGE_OFFSET : TASK_SIZE) +#define STACK_TOP TASK_SIZE #endif #endif /* __A_OUT_GNU_H__ */ |