From: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
To: sean.j.christopherson@intel.com
Cc: linux-sgx@vger.kernel.org
Subject: mmap(), #PF handler and EADD interaction
Date: Mon, 19 Aug 2019 18:24:31 +0300 [thread overview]
Message-ID: <20190819152431.x5ajhd67cpqag5ue@linux.intel.com> (raw)
I did some backtracking today how the permission flow worked.
With the maximum VM flags defined for a page, what if EADD is done after
mmap()? E.g. we first do mmap() with RWX and later EADD with lets say
RW.
The first thing that comes to mind is that the #PF handler should caught
this corner case.
Now the code correctly validates when you do either mmap() and
mprotect() after EADD(s) but I think "other way around" is missing.
/Jarkko
next reply other threads:[~2019-08-19 15:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-19 15:24 Jarkko Sakkinen [this message]
2019-08-19 17:54 ` mmap(), #PF handler and EADD interaction Sean Christopherson
2019-08-21 18:15 ` Jarkko Sakkinen
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