From: Andrey Konovalov <andreyknvl@google.com>
To: "Catalin Marinas" <catalin.marinas@arm.com>,
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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>,
Andrey Konovalov <andreyknvl@google.com>
Subject: [RFC PATCH 0/6] arm64: untag user pointers passed to the kernel
Date: Fri, 9 Mar 2018 15:01:58 +0100 [thread overview]
Message-ID: <cover.1520600533.git.andreyknvl@google.com> (raw)
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.
It would be nice to learn about the interfaces that I missed though.
Sending this as an RFC, as I'm not sure if this should be committed as is,
and would like to receive some feedback.
Thanks!
[1] http://clang.llvm.org/docs/HardwareAssistedAddressSanitizerDesign.html
Andrey Konovalov (6):
arm64: add type casts to untagged_addr macro
arm64: untag user addresses in copy_from_user and others
mm, arm64: untag user addresses in memory syscalls
mm, arm64: untag user addresses in mm/gup.c
lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user
arch: add untagged_addr definition for other arches
arch/alpha/include/asm/uaccess.h | 2 ++
arch/arc/include/asm/uaccess.h | 1 +
arch/arm/include/asm/uaccess.h | 2 ++
arch/arm64/include/asm/uaccess.h | 9 +++++++--
arch/blackfin/include/asm/uaccess.h | 2 ++
arch/c6x/include/asm/uaccess.h | 2 ++
arch/cris/include/asm/uaccess.h | 2 ++
arch/frv/include/asm/uaccess.h | 2 ++
arch/ia64/include/asm/uaccess.h | 2 ++
arch/m32r/include/asm/uaccess.h | 2 ++
arch/m68k/include/asm/uaccess.h | 2 ++
arch/metag/include/asm/uaccess.h | 2 ++
arch/microblaze/include/asm/uaccess.h | 2 ++
arch/mips/include/asm/uaccess.h | 2 ++
arch/mn10300/include/asm/uaccess.h | 2 ++
arch/nios2/include/asm/uaccess.h | 2 ++
arch/openrisc/include/asm/uaccess.h | 2 ++
arch/parisc/include/asm/uaccess.h | 2 ++
arch/powerpc/include/asm/uaccess.h | 2 ++
arch/riscv/include/asm/uaccess.h | 2 ++
arch/score/include/asm/uaccess.h | 2 ++
arch/sh/include/asm/uaccess.h | 2 ++
arch/sparc/include/asm/uaccess.h | 2 ++
arch/tile/include/asm/uaccess.h | 2 ++
arch/x86/include/asm/uaccess.h | 2 ++
arch/xtensa/include/asm/uaccess.h | 2 ++
include/asm-generic/uaccess.h | 2 ++
lib/strncpy_from_user.c | 2 ++
lib/strnlen_user.c | 2 ++
mm/gup.c | 12 ++++++++++++
mm/madvise.c | 2 ++
mm/mempolicy.c | 6 ++++++
mm/mincore.c | 2 ++
mm/mlock.c | 5 +++++
mm/mmap.c | 9 +++++++++
mm/mprotect.c | 2 ++
mm/mremap.c | 2 ++
mm/msync.c | 3 +++
38 files changed, 105 insertions(+), 2 deletions(-)
--
2.16.2.395.g2e18187dfd-goog
next reply other threads:[~2018-03-09 14:02 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-09 14:01 Andrey Konovalov [this message]
2018-03-09 14:01 ` [RFC PATCH 1/6] arm64: add type casts to untagged_addr macro Andrey Konovalov
2018-03-09 14:02 ` [RFC PATCH 2/6] arm64: untag user addresses in copy_from_user and others Andrey Konovalov
2018-03-09 15:03 ` Mark Rutland
2018-03-09 15:58 ` Catalin Marinas
2018-03-09 17:57 ` Andrey Konovalov
2018-03-09 14:02 ` [RFC PATCH 3/6] mm, arm64: untag user addresses in memory syscalls Andrey Konovalov
2018-03-09 14:02 ` [RFC PATCH 4/6] mm, arm64: untag user addresses in mm/gup.c Andrey Konovalov
2018-03-09 14:02 ` [RFC PATCH 5/6] lib, arm64: untag addrs passed to strncpy_from_user and strnlen_user Andrey Konovalov
2018-03-09 14:02 ` [RFC PATCH 6/6] arch: add untagged_addr definition for other arches Andrey Konovalov
2018-03-09 14:11 ` Arnd Bergmann
2018-03-09 14:16 ` Robin Murphy
2018-03-09 15:47 ` Andrey Konovalov
2018-03-09 14:15 ` [RFC PATCH 0/6] arm64: untag user pointers passed to the kernel Robin Murphy
2018-03-09 17:58 ` Andrey Konovalov
2018-03-09 14:55 ` Mark Rutland
2018-03-09 15:16 ` Geert Uytterhoeven
2018-03-09 17:58 ` Andrey Konovalov
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