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From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Mark Rutland <mark.rutland@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Andrey Konovalov <andreyknvl@google.com>,
	James Morse <james.morse@arm.com>,
	Kees Cook <keescook@chromium.org>,
	Bart Van Assche <bart.vanassche@wdc.com>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Philippe Ombredanne <pombredanne@nexb.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>,
	Zi Yan <zi.yan@cs.rutgers.edu>,
	linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.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>
Subject: [RFC PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt
Date: Tue, 27 Mar 2018 18:57:42 +0200	[thread overview]
Message-ID: <080040fac18377cb6b9cd418668a10e1113b3c2a.1522169685.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1522169685.git.andreyknvl@google.com>
In-Reply-To: <cover.1522169685.git.andreyknvl@google.com>

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(-)

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

WARNING: multiple messages have this Message-ID (diff)
From: Andrey Konovalov <andreyknvl@google.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Mark Rutland <mark.rutland@arm.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Al Viro <viro@zeniv.linux.org.uk>,
	Andrey Konovalov <andreyknvl@google.com>,
	James Morse <james.morse@arm.com>,
	Kees Cook <keescook@chromium.org>,
	Bart Van Assche <bart.vanassche@wdc.com>,
	Kate Stewart <kstewart@linuxfoundation.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Philippe Ombredanne <pombredanne@nexb.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Ingo Molnar <mingo@kernel.org>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	"Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>,
	Zi Yan <zi.yan@cs.rutgers.edu>,
	linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.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>
Subject: [RFC PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt
Date: Tue, 27 Mar 2018 18:57:42 +0200	[thread overview]
Message-ID: <080040fac18377cb6b9cd418668a10e1113b3c2a.1522169685.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1522169685.git.andreyknvl@google.com>
In-Reply-To: <cover.1522169685.git.andreyknvl@google.com>

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(-)

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

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WARNING: multiple messages have this Message-ID (diff)
From: andreyknvl@google.com (Andrey Konovalov)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt
Date: Tue, 27 Mar 2018 18:57:42 +0200	[thread overview]
Message-ID: <080040fac18377cb6b9cd418668a10e1113b3c2a.1522169685.git.andreyknvl@google.com> (raw)
In-Reply-To: <cover.1522169685.git.andreyknvl@google.com>

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(-)

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

  parent reply	other threads:[~2018-03-27 16:57 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-27 16:57 [RFC PATCH v2 0/6] arm64: untag user pointers passed to the kernel Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57 ` [RFC PATCH v2 1/6] arm64: add type casts to untagged_addr macro Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57 ` [RFC PATCH v2 2/6] uaccess: add untagged_addr definition for other arches Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57 ` [RFC PATCH v2 3/6] arm64: untag user addresses in copy_from_user and others Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57 ` [RFC PATCH v2 4/6] mm, arm64: untag user addresses in mm/gup.c Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57 ` [RFC PATCH v2 5/6] lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov [this message]
2018-03-27 16:57   ` [RFC PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt Andrey Konovalov
2018-03-27 16:57   ` Andrey Konovalov

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