linux-kernel - [RFC PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt

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Message-Id: <080040fac18377cb6b9cd418668a10e1113b3c2a.1522169685.git.andreyknvl@google.com>
Date:   Tue, 27 Mar 2018 18:57:42 +0200
From:   Andrey Konovalov <andreyknvl@...gle.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        Jonathan Corbet <corbet@....net>,
        Mark Rutland <mark.rutland@....com>,
        Robin Murphy <robin.murphy@....com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        James Morse <james.morse@....com>,
        Kees Cook <keescook@...omium.org>,
        Bart Van Assche <bart.vanassche@....com>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Zi Yan <zi.yan@...rutgers.edu>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        Kostya Serebryany <kcc@...gle.com>,
        Evgeniy Stepanov <eugenis@...gle.com>,
        Lee Smith <Lee.Smith@....com>,
        Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
        Jacob Bramley <Jacob.Bramley@....com>,
        Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>
Subject: [RFC PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt

Add a note that work on passing tagged user pointers to the kernel via
syscalls has started, but might not be complete yet.

Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
---
 Documentation/arm64/tagged-pointers.txt | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Documentation/arm64/tagged-pointers.txt b/Documentation/arm64/tagged-pointers.txt
index a25a99e82bb1..361481283f00 100644
--- a/Documentation/arm64/tagged-pointers.txt
+++ b/Documentation/arm64/tagged-pointers.txt
@@ -35,8 +35,9 @@ Using non-zero address tags in any of these locations may result in an
 error code being returned, a (fatal) signal being raised, or other modes
 of failure.
 
-For these reasons, passing non-zero address tags to the kernel via
-system calls is forbidden, and using a non-zero address tag for sp is
+Some initial work for supporting non-zero address tags passed to the
+kernel via system calls has been done, but the kernel doesn't provide
+any guarantees at this point. Using a non-zero address tag for sp is
 strongly discouraged.
 
 Programs maintaining a frame pointer and frame records that use non-zero
-- 
2.17.0.rc0.231.g781580f067-goog