From: Florent Revest <revest@chromium.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
catalin.marinas@arm.com, anshuman.khandual@arm.com,
joey.gouly@arm.com, mhocko@suse.com, keescook@chromium.org,
david@redhat.com, peterx@redhat.com, izbyshev@ispras.ru,
broonie@kernel.org, szabolcs.nagy@arm.com, kpsingh@kernel.org,
gthelen@google.com, toiwoton@gmail.com, ayush.jain3@amd.com
Subject: Re: [PATCH v4 5/6] mm: Add a NO_INHERIT flag to the PR_SET_MDWE prctl
Date: Tue, 3 Oct 2023 17:52:38 +0200 [thread overview]
Message-ID: <CABRcYmJpSAppk315vzitO9N-D=p7sJ+QiKWtA6w5mEven=Cm6A@mail.gmail.com> (raw)
In-Reply-To: <20230921183323.c990c57d0b43832b39d3e363@linux-foundation.org>
On Fri, Sep 22, 2023 at 3:33 AM Andrew Morton <akpm@linux-foundation.org> wrote:
>
> On Mon, 28 Aug 2023 17:08:57 +0200 Florent Revest <revest@chromium.org> wrote:
>
> > This extends the current PR_SET_MDWE prctl arg with a bit to indicate
> > that the process doesn't want MDWE protection to propagate to children.
> >
> > To implement this no-inherit mode, the tag in current->mm->flags must be
> > absent from MMF_INIT_MASK. This means that the encoding for "MDWE but
> > without inherit" is different in the prctl than in the mm flags. This
> > leads to a bit of bit-mangling in the prctl implementation.
>
> Is a manpage update planned?
Ah that's a good point, I didn't think about it, thank you.
> And did we update the manpage for PR_SET_MDWE?
No we didn't but I sent a patch to man-pages here:
https://lore.kernel.org/linux-man/20231003155010.3651349-1-revest@chromium.org/
next prev parent reply other threads:[~2023-10-03 15:52 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-28 15:08 [PATCH v4 0/6] MDWE without inheritance Florent Revest
2023-08-28 15:08 ` [PATCH v4 1/6] kselftest: vm: Fix tabs/spaces inconsistency in the mdwe test Florent Revest
2023-08-28 15:08 ` [PATCH v4 2/6] kselftest: vm: Fix mdwe's mmap_FIXED test case Florent Revest
2023-08-28 15:08 ` [PATCH v4 3/6] kselftest: vm: Check errnos in mdwe_test Florent Revest
2023-08-28 18:45 ` Kees Cook
2023-09-21 9:51 ` Catalin Marinas
2023-08-28 15:08 ` [PATCH v4 4/6] mm: Make PR_MDWE_REFUSE_EXEC_GAIN an unsigned long Florent Revest
2023-09-22 1:29 ` Andrew Morton
2023-09-22 13:10 ` Florent Revest
2023-08-28 15:08 ` [PATCH v4 5/6] mm: Add a NO_INHERIT flag to the PR_SET_MDWE prctl Florent Revest
2023-09-22 1:33 ` Andrew Morton
2023-10-03 15:52 ` Florent Revest [this message]
2023-08-28 15:08 ` [PATCH v4 6/6] kselftest: vm: Add tests for no-inherit memory-deny-write-execute Florent Revest
2023-08-28 18:45 ` Kees Cook
2023-09-20 19:56 ` [PATCH v4 0/6] MDWE without inheritance Florent Revest
2023-09-21 9:52 ` Catalin Marinas
2023-09-21 9:57 ` Florent Revest
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