From: Julien Thierry <julien.thierry@arm.com>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, mingo@redhat.com,
peterz@infradead.org, hpa@zytor.com
Cc: catalin.marinas@arm.com, will.deacon@arm.com,
james.morse@arm.com, valentin.schneider@arm.com
Subject: Re: [PATCH v3 0/4] uaccess: Add unsafe accessors for arm64
Date: Wed, 30 Jan 2019 16:17:00 +0000 [thread overview]
Message-ID: <3bb671a6-a7df-9c96-e4d3-09167df6dab1@arm.com> (raw)
In-Reply-To: <1547560709-56207-1-git-send-email-julien.thierry@arm.com>
Hi,
Gentle ping for patches 3 and 4.
Thanks,
Julien
On 15/01/2019 13:58, Julien Thierry wrote:
> Hi,
>
> First version of this series[1] was briefly in linux-next but had to be
> reverted due to a bug where schedule would end up being called while
> user_access was active[2].
>
> After clarifications[3], rescheduling while in a user_access region is not
> allowed.
>
> * Patches 1 and 2 implement the unsafe accessors for arm64
> * Patches 3 and 4 clarify this restriction in the API and attempts to
> check against violations of the restriction.
>
> Changes since v2[4]:
> - Rebase on v5.0-rc2
> - access_ok() is now done in user_access_begin(), so rework accessors
> so access_ok() is not called in unsafe_get/put_user()
> - Split addition of unsafe accessors and the user_access_region check
> into separate patches
> - Avoid reading SCTLR_EL1 in user_access_region check
> - Add build option for user_access_region checking
> - Reword clarifications on unsafe accessors API
>
> Changes since v1[1]:
> - Add a way to detect code calling schedule within a user_access region
> - Make sure put_user/get_user arguments are evaluated before disabling PAN
>
> [1] https://www.spinics.net/lists/arm-kernel/msg674925.html
> [2] https://patchwork.kernel.org/patch/10634783/
> [3] https://lkml.org/lkml/2018/11/28/50
> [4] http://lists.infradead.org/pipermail/linux-arm-kernel/2018-December/617080.html
>
> Cheers,
>
> Julien
>
> -->
>
> Julien Thierry (4):
> arm64: uaccess: Cleanup get/put_user()
> arm64: uaccess: Implement unsafe accessors
> uaccess: Check no rescheduling function is called in unsafe region
> arm64: uaccess: Implement user_access_region_active
>
> arch/arm64/include/asm/sysreg.h | 2 +
> arch/arm64/include/asm/uaccess.h | 123 ++++++++++++++++++++++++++-------------
> include/linux/kernel.h | 11 +++-
> include/linux/uaccess.h | 13 +++++
> kernel/sched/core.c | 22 +++++++
> lib/Kconfig.debug | 8 +++
> 6 files changed, 135 insertions(+), 44 deletions(-)
>
> --
> 1.9.1
>
--
Julien Thierry
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prev parent reply other threads:[~2019-01-30 16:17 UTC|newest]
Thread overview: 88+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-15 13:58 [PATCH v3 0/4] uaccess: Add unsafe accessors for arm64 Julien Thierry
2019-01-15 13:58 ` [PATCH v3 1/4] arm64: uaccess: Cleanup get/put_user() Julien Thierry
2019-01-15 13:58 ` [PATCH v3 2/4] arm64: uaccess: Implement unsafe accessors Julien Thierry
2019-01-15 13:58 ` [PATCH v3 3/4] uaccess: Check no rescheduling function is called in unsafe region Julien Thierry
2019-01-30 16:58 ` Valentin Schneider
2019-02-04 13:27 ` Julien Thierry
2019-02-11 13:45 ` Ingo Molnar
2019-02-11 13:51 ` Peter Zijlstra
2019-02-12 9:15 ` Julien Thierry
2019-02-13 8:21 ` Ingo Molnar
2019-02-13 10:35 ` Peter Zijlstra
2019-02-13 10:50 ` Julien Thierry
2019-02-13 13:17 ` Peter Zijlstra
2019-02-13 13:20 ` Peter Zijlstra
2019-02-13 14:00 ` Will Deacon
2019-02-13 14:07 ` Julien Thierry
2019-02-13 14:17 ` Peter Zijlstra
2019-02-13 14:24 ` Julien Thierry
2019-02-13 14:40 ` Peter Zijlstra
2019-02-13 15:08 ` Peter Zijlstra
2019-02-13 14:25 ` Peter Zijlstra
2019-02-13 14:39 ` Julien Thierry
2019-02-13 14:41 ` Peter Zijlstra
2019-02-13 15:45 ` Peter Zijlstra
2019-02-13 18:54 ` Peter Zijlstra
[not found] ` <D61C430D-4321-4114-AB85-671A3C7B8EAE@amacapital.net>
2019-02-13 22:21 ` Peter Zijlstra
2019-02-13 22:49 ` Andy Lutomirski
2019-02-14 10:14 ` [PATCH] sched/x86: Save [ER]FLAGS on context switch Peter Zijlstra
2019-02-14 16:18 ` Brian Gerst
2019-02-14 19:34 ` Peter Zijlstra
2019-02-15 14:34 ` Brian Gerst
2019-02-15 17:18 ` Linus Torvalds
2019-02-15 17:40 ` Peter Zijlstra
2019-02-15 18:28 ` Andy Lutomirski
2019-02-15 23:34 ` Peter Zijlstra
2019-02-16 0:21 ` Linus Torvalds
2019-02-16 10:32 ` Peter Zijlstra
2019-02-16 4:06 ` hpa
2019-02-16 10:30 ` Peter Zijlstra
2019-02-18 22:30 ` H. Peter Anvin
2019-02-19 0:24 ` Linus Torvalds
2019-02-19 2:20 ` Andy Lutomirski
2019-02-19 2:46 ` H. Peter Anvin
2019-02-19 9:07 ` Julien Thierry
2019-02-19 8:53 ` Julien Thierry
2019-02-19 9:15 ` Peter Zijlstra
2019-02-19 9:19 ` Peter Zijlstra
2019-02-19 9:04 ` Peter Zijlstra
2019-02-19 9:21 ` hpa
2019-02-19 9:44 ` Peter Zijlstra
2019-02-19 11:38 ` Thomas Gleixner
2019-02-19 11:58 ` Peter Zijlstra
2019-02-19 12:48 ` Will Deacon
2019-02-20 22:55 ` H. Peter Anvin
2019-02-21 12:06 ` Julien Thierry
2019-02-21 21:35 ` Thomas Gleixner
2019-02-21 22:08 ` Linus Torvalds
2019-02-22 12:58 ` Peter Zijlstra
2019-02-22 18:10 ` Thomas Gleixner
2019-02-22 22:26 ` [RFC][PATCH] objtool: STAC/CLAC validation Peter Zijlstra
2019-02-22 23:34 ` Linus Torvalds
2019-02-23 8:43 ` Peter Zijlstra
2019-02-22 23:39 ` hpa
2019-02-23 8:39 ` Peter Zijlstra
2019-02-25 8:47 ` hpa
2019-02-25 13:21 ` Peter Zijlstra
2019-03-01 15:07 ` Peter Zijlstra
2019-02-25 8:49 ` hpa
2019-02-22 23:55 ` Andy Lutomirski
2019-02-23 8:37 ` Peter Zijlstra
2019-02-23 10:52 ` Peter Zijlstra
2019-02-25 10:51 ` Peter Zijlstra
2019-02-25 11:53 ` Peter Zijlstra
2019-02-25 15:36 ` Andy Lutomirski
2019-02-23 0:34 ` Andy Lutomirski
2019-02-23 1:12 ` Linus Torvalds
2019-02-23 1:16 ` Andy Lutomirski
2019-02-23 1:33 ` Linus Torvalds
2019-02-23 1:40 ` Linus Torvalds
2019-02-25 8:33 ` Julien Thierry
2019-02-25 11:55 ` Peter Zijlstra
2019-02-21 12:46 ` [PATCH] sched/x86: Save [ER]FLAGS on context switch Will Deacon
2019-02-21 22:06 ` Andy Lutomirski
2019-02-18 9:03 ` [PATCH v2] " Peter Zijlstra
2019-02-13 23:19 ` [PATCH v3 3/4] uaccess: Check no rescheduling function is called in unsafe region Linus Torvalds
2019-01-15 13:58 ` [PATCH v3 4/4] arm64: uaccess: Implement user_access_region_active Julien Thierry
2019-01-25 14:27 ` [PATCH v3 0/4] uaccess: Add unsafe accessors for arm64 Catalin Marinas
2019-01-30 16:17 ` Julien Thierry [this message]
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