Messages in this thread | | | From | Kees Cook <> | Date | Fri, 19 May 2017 12:16:27 -0700 | Subject | Re: next-20170515: WARNING: CPU: 0 PID: 1 at arch/x86/mm/dump_pagetables.c:236 note_page+0x630/0x7e0 |
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On Fri, May 19, 2017 at 11:27 AM, Andy Lutomirski <luto@kernel.org> wrote: > One thing I've pondered: can we make some debugging mode (kmemleak, > perhaps?) check that freed memory is RW at the time it's freed? I > once wrote some buggy code that freed an R page and caused an OOPS > much later, and this bug here seems likely to be some code that frees > RWX memory.
Which begs for even more checks: nothing should ever make a page RWX. Either R, RW, or RX only... (or X too I guess, in the future).
-Kees
-- Kees Cook Pixel Security
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