On 09/15/2014 08:20 PM, Ren, Qiaowei wrote: >> What are the semantics across execve() ? >> > This will not impact on the semantics of execve(). One runtime > library > for MPX will be provided (or merged into Glibc), and when the > application starts, this runtime will be called to initialize MPX > runtime environment, including calling prctl() to notify the kernel to > start managing the bounds directories. You can see the discussion > about exec(): https://lkml.org/lkml/2014/1/26/199 I think he's asking what happens to the kernel value at execve() time. The short answer is that it is zero'd along with the rest of a new mm. It probably _shouldn't_ be, though. It's actually valid to have a bound directory at 0x0. We probably need to initialize it to -1 instead, and that means initializing to -1 at execve() time. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>