Messages in this thread | | | Date | Sun, 26 Oct 2014 17:18:19 +0000 | From | Al Viro <> | Subject | Re: [PATCH] all arches, signal: Move restart_block to struct task_struct |
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On Sun, Oct 26, 2014 at 10:02:16AM -0700, Andy Lutomirski wrote: > If an attacker can cause a controlled kernel stack overflow, > overwriting the restart block is a very juicy exploit target. > Moving the restart block to struct task_struct prevents this type of > exploit.
The hell it does. In a _lot_ of cases current is current_thread_info()->task, which makes your variant just as vulnerable, in addition to being (slightly) more costly.
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