Messages in this thread | | | Subject | Re: [PATCH 1/9] x86, pkeys: do not special case protection key 0 | From | Dave Hansen <> | Date | Mon, 26 Mar 2018 10:53:35 -0700 |
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On 03/26/2018 10:47 AM, Shuah Khan wrote: > > Also what happens "pkey_free() pkey-0" - can you elaborate more on that > "silliness consequences"
It's just what happens if you free any other pkey that is in use: it might get reallocated later. The most likely scenario is that you will get pkey-0 back from pkey_alloc(), you will set an access-disable or write-disable bit in PKRU for it, and your next stack access will SIGSEGV.
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