c/r: prctl: add minimal address test to PR_SET_MM
authorCyrill Gorcunov <gorcunov@openvz.org>
Thu, 7 Jun 2012 21:21:11 +0000 (14:21 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 7 Jun 2012 21:43:55 +0000 (14:43 -0700)
Make sure the address being set is greater than mmap_min_addr (as
suggested by Kees Cook).

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Kees Cook <keescook@chromium.org>
Cc: Serge Hallyn <serge.hallyn@canonical.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
kernel/sys.c

index 54f20fdee93c300a57556e004ffbf7f0b5e83cff..19a2c7139960c174a953560173fb778f0e67378f 100644 (file)
@@ -1869,7 +1869,7 @@ static int prctl_set_mm(int opt, unsigned long addr,
        if (opt == PR_SET_MM_EXE_FILE)
                return prctl_set_mm_exe_file(mm, (unsigned int)addr);
 
-       if (addr >= TASK_SIZE)
+       if (addr >= TASK_SIZE || addr < mmap_min_addr)
                return -EINVAL;
 
        error = -EINVAL;