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 0/6] arm64: untag user pointers passed to the kernel
Date: Tue, 27 Mar 2018 18:57:36 +0200 [thread overview]
Message-ID: <cover.1522169685.git.andreyknvl@google.com> (raw)
Hi!
arm64 has a feature called Top Byte Ignore, which allows to embed pointer
tags into the top byte of each pointer. Userspace programs (such as
HWASan, a memory debugging tool [1]) might use this feature and pass
tagged user pointers to the kernel through syscalls or other interfaces.
This patch makes a few of the kernel interfaces accept tagged user
pointers. The kernel is already able to handle user faults with tagged
pointers and has the untagged_addr macro, which this patchset reuses.
We're not trying to cover all possible ways the kernel accepts user
pointers in one patchset, so this one should be considered as a start.
Thanks!
[1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
Changes in RFC v2:
- Added "#ifndef untagged_addr..." fallback in linux/uaccess.h instead of
defining it for each arch individually.
- Updated Documentation/arm64/tagged-pointers.txt.
- Dropped “mm, arm64: untag user addresses in memory syscalls”.
- Rebased onto 3eb2ce82 (4.16-rc7).
Andrey Konovalov (6):
arm64: add type casts to untagged_addr macro
uaccess: add untagged_addr definition for other arches
arm64: untag user addresses in copy_from_user and others
mm, arm64: untag user addresses in mm/gup.c
lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user
arm64: update Documentation/arm64/tagged-pointers.txt
Documentation/arm64/tagged-pointers.txt | 5 +++--
arch/arm64/include/asm/uaccess.h | 9 +++++++--
include/linux/uaccess.h | 4 ++++
lib/strncpy_from_user.c | 2 ++
lib/strnlen_user.c | 2 ++
mm/gup.c | 12 ++++++++++++
6 files changed, 30 insertions(+), 4 deletions(-)
--
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 0/6] arm64: untag user pointers passed to the kernel
Date: Tue, 27 Mar 2018 18:57:36 +0200 [thread overview]
Message-ID: <cover.1522169685.git.andreyknvl@google.com> (raw)
Hi!
arm64 has a feature called Top Byte Ignore, which allows to embed pointer
tags into the top byte of each pointer. Userspace programs (such as
HWASan, a memory debugging tool [1]) might use this feature and pass
tagged user pointers to the kernel through syscalls or other interfaces.
This patch makes a few of the kernel interfaces accept tagged user
pointers. The kernel is already able to handle user faults with tagged
pointers and has the untagged_addr macro, which this patchset reuses.
We're not trying to cover all possible ways the kernel accepts user
pointers in one patchset, so this one should be considered as a start.
Thanks!
[1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
Changes in RFC v2:
- Added "#ifndef untagged_addr..." fallback in linux/uaccess.h instead of
defining it for each arch individually.
- Updated Documentation/arm64/tagged-pointers.txt.
- Dropped “mm, arm64: untag user addresses in memory syscalls”.
- Rebased onto 3eb2ce82 (4.16-rc7).
Andrey Konovalov (6):
arm64: add type casts to untagged_addr macro
uaccess: add untagged_addr definition for other arches
arm64: untag user addresses in copy_from_user and others
mm, arm64: untag user addresses in mm/gup.c
lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user
arm64: update Documentation/arm64/tagged-pointers.txt
Documentation/arm64/tagged-pointers.txt | 5 +++--
arch/arm64/include/asm/uaccess.h | 9 +++++++--
include/linux/uaccess.h | 4 ++++
lib/strncpy_from_user.c | 2 ++
lib/strnlen_user.c | 2 ++
mm/gup.c | 12 ++++++++++++
6 files changed, 30 insertions(+), 4 deletions(-)
--
2.17.0.rc0.231.g781580f067-goog
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
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 0/6] arm64: untag user pointers passed to the kernel
Date: Tue, 27 Mar 2018 18:57:36 +0200 [thread overview]
Message-ID: <cover.1522169685.git.andreyknvl@google.com> (raw)
Hi!
arm64 has a feature called Top Byte Ignore, which allows to embed pointer
tags into the top byte of each pointer. Userspace programs (such as
HWASan, a memory debugging tool [1]) might use this feature and pass
tagged user pointers to the kernel through syscalls or other interfaces.
This patch makes a few of the kernel interfaces accept tagged user
pointers. The kernel is already able to handle user faults with tagged
pointers and has the untagged_addr macro, which this patchset reuses.
We're not trying to cover all possible ways the kernel accepts user
pointers in one patchset, so this one should be considered as a start.
Thanks!
[1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
Changes in RFC v2:
- Added "#ifndef untagged_addr..." fallback in linux/uaccess.h instead of
defining it for each arch individually.
- Updated Documentation/arm64/tagged-pointers.txt.
- Dropped a??mm, arm64: untag user addresses in memory syscallsa??.
- Rebased onto 3eb2ce82 (4.16-rc7).
Andrey Konovalov (6):
arm64: add type casts to untagged_addr macro
uaccess: add untagged_addr definition for other arches
arm64: untag user addresses in copy_from_user and others
mm, arm64: untag user addresses in mm/gup.c
lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user
arm64: update Documentation/arm64/tagged-pointers.txt
Documentation/arm64/tagged-pointers.txt | 5 +++--
arch/arm64/include/asm/uaccess.h | 9 +++++++--
include/linux/uaccess.h | 4 ++++
lib/strncpy_from_user.c | 2 ++
lib/strnlen_user.c | 2 ++
mm/gup.c | 12 ++++++++++++
6 files changed, 30 insertions(+), 4 deletions(-)
--
2.17.0.rc0.231.g781580f067-goog
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 0/6] arm64: untag user pointers passed to the kernel
Date: Tue, 27 Mar 2018 18:57:36 +0200 [thread overview]
Message-ID: <cover.1522169685.git.andreyknvl@google.com> (raw)
Hi!
arm64 has a feature called Top Byte Ignore, which allows to embed pointer
tags into the top byte of each pointer. Userspace programs (such as
HWASan, a memory debugging tool [1]) might use this feature and pass
tagged user pointers to the kernel through syscalls or other interfaces.
This patch makes a few of the kernel interfaces accept tagged user
pointers. The kernel is already able to handle user faults with tagged
pointers and has the untagged_addr macro, which this patchset reuses.
We're not trying to cover all possible ways the kernel accepts user
pointers in one patchset, so this one should be considered as a start.
Thanks!
[1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
Changes in RFC v2:
- Added "#ifndef untagged_addr..." fallback in linux/uaccess.h instead of
defining it for each arch individually.
- Updated Documentation/arm64/tagged-pointers.txt.
- Dropped ?mm, arm64: untag user addresses in memory syscalls?.
- Rebased onto 3eb2ce82 (4.16-rc7).
Andrey Konovalov (6):
arm64: add type casts to untagged_addr macro
uaccess: add untagged_addr definition for other arches
arm64: untag user addresses in copy_from_user and others
mm, arm64: untag user addresses in mm/gup.c
lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user
arm64: update Documentation/arm64/tagged-pointers.txt
Documentation/arm64/tagged-pointers.txt | 5 +++--
arch/arm64/include/asm/uaccess.h | 9 +++++++--
include/linux/uaccess.h | 4 ++++
lib/strncpy_from_user.c | 2 ++
lib/strnlen_user.c | 2 ++
mm/gup.c | 12 ++++++++++++
6 files changed, 30 insertions(+), 4 deletions(-)
--
2.17.0.rc0.231.g781580f067-goog
next 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 Andrey Konovalov [this message]
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 ` [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 ` [RFC PATCH v2 6/6] arm64: update Documentation/arm64/tagged-pointers.txt Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
2018-03-27 16:57 ` Andrey Konovalov
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=cover.1522169685.git.andreyknvl@google.com \
--to=andreyknvl@google.com \
--cc=Jacob.Bramley@arm.com \
--cc=Lee.Smith@arm.com \
--cc=Ramana.Radhakrishnan@arm.com \
--cc=Ruben.Ayrapetyan@arm.com \
--cc=akpm@linux-foundation.org \
--cc=aneesh.kumar@linux.vnet.ibm.com \
--cc=bart.vanassche@wdc.com \
--cc=catalin.marinas@arm.com \
--cc=corbet@lwn.net \
--cc=dan.j.williams@intel.com \
--cc=dvyukov@google.com \
--cc=eugenis@google.com \
--cc=gregkh@linuxfoundation.org \
--cc=james.morse@arm.com \
--cc=kcc@google.com \
--cc=keescook@chromium.org \
--cc=kirill.shutemov@linux.intel.com \
--cc=kstewart@linuxfoundation.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mark.rutland@arm.com \
--cc=mingo@kernel.org \
--cc=pombredanne@nexb.com \
--cc=robin.murphy@arm.com \
--cc=tglx@linutronix.de \
--cc=viro@zeniv.linux.org.uk \
--cc=will.deacon@arm.com \
--cc=zi.yan@cs.rutgers.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.