Message ID | ac42b33affe34c8146ac9a882f6c6be270726dc7.1529507994.git.andreyknvl@google.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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[209.85.220.65]) by mx.google.com with SMTPS id 207-v6sor988323wme.25.2018.06.20.08.24.39 for <linux-mm@kvack.org> (Google Transport Security); Wed, 20 Jun 2018 08:24:39 -0700 (PDT) Received-SPF: pass (google.com: domain of andreyknvl@google.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b="Yi5PvRI/"; spf=pass (google.com: domain of andreyknvl@google.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=andreyknvl@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=k+iZynWQRXvZ5615wlWaB9aY3Mmlz8ffNowSv6lWV9c=; b=Yi5PvRI/WvQZWuC7LBADIW/4S61zU6FsZnonsBPtHh1OnZr/tsw7/vgcilAYEPpp3P H7MOwSQfZAnX4kMMjr5GbcWRcrWLJUjgyo9MQQymOZwV6IhhzlVDJWd0fN0dkju/J6fP kuuowXeWkDK1Q1Zbw606Nm6H1UdvRSyROBOfOtpK/2ddCELHQLRsilicNU1P20TUmB+i ijMKrVL6HDf/W3bvGx1eijAeBX7IOub0BlEIuDAS2sPkjYisHX3IPc6514252u+k79/j 36kdUCz1UAbQ63TLoKQyKpwPU9dJP51RVzpkdc3SjxmH9ukUghNG1YH2/xltV/ZzVLLO uf7Q== X-Google-Smtp-Source: ADUXVKJXc6AKKDoJ+FdN8W93tAEIqcHbvpdSefvagKsbEhUe3hdApwEhSHA+uBzxdDaEIYJpEXocQA== X-Received: by 2002:a1c:3693:: with SMTP id y19-v6mr2024605wmh.71.1529508279217; Wed, 20 Jun 2018 08:24:39 -0700 (PDT) Received: from andreyknvl0.muc.corp.google.com ([2a00:79e0:15:10:84be:a42a:826d:c530]) by smtp.gmail.com with ESMTPSA id c11-v6sm3959244wrm.65.2018.06.20.08.24.37 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 20 Jun 2018 08:24:38 -0700 (PDT) From: Andrey Konovalov <andreyknvl@google.com> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will.deacon@arm.com>, Mark Rutland <mark.rutland@arm.com>, Robin Murphy <robin.murphy@arm.com>, Al Viro <viro@zeniv.linux.org.uk>, Andrey Konovalov <andreyknvl@google.com>, Kees Cook <keescook@chromium.org>, Kate Stewart <kstewart@linuxfoundation.org>, Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Andrew Morton <akpm@linux-foundation.org>, Ingo Molnar <mingo@kernel.org>, "Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>, Shuah Khan <shuah@kernel.org>, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Dmitry Vyukov <dvyukov@google.com>, Kostya Serebryany <kcc@google.com>, Evgeniy Stepanov <eugenis@google.com>, Lee Smith <Lee.Smith@arm.com>, Ramana Radhakrishnan <Ramana.Radhakrishnan@arm.com>, Jacob Bramley <Jacob.Bramley@arm.com>, Ruben Ayrapetyan <Ruben.Ayrapetyan@arm.com>, Chintan Pandya <cpandya@codeaurora.org> Subject: [PATCH v4 6/7] arm64: update Documentation/arm64/tagged-pointers.txt Date: Wed, 20 Jun 2018 17:24:25 +0200 Message-Id: <ac42b33affe34c8146ac9a882f6c6be270726dc7.1529507994.git.andreyknvl@google.com> X-Mailer: git-send-email 2.18.0.rc1.244.gcf134e6275-goog In-Reply-To: <cover.1529507994.git.andreyknvl@google.com> References: <cover.1529507994.git.andreyknvl@google.com> X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: <linux-mm.kvack.org> X-Virus-Scanned: ClamAV using ClamSMTP |
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
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@google.com> --- Documentation/arm64/tagged-pointers.txt | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)