From: Catalin Marinas <catalin.marinas@arm.com>
To: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: linux-arm-kernel@lists.infradead.org,
Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
Richard Earnshaw <Richard.Earnshaw@arm.com>,
Andrey Konovalov <andreyknvl@google.com>,
linux-mm@kvack.org, linux-arch@vger.kernel.org
Subject: Re: [PATCH 19/22] arm64: mte: Allow user control of the tag check mode via prctl()
Date: Wed, 12 Feb 2020 11:45:17 +0000 [thread overview]
Message-ID: <20200212114517.GF488264@arrakis.emea.arm.com> (raw)
In-Reply-To: <cdd9d203-00c8-0a63-69b5-66234c0e9d9a@arm.com>
On Fri, Dec 27, 2019 at 02:34:32PM +0000, Kevin Brodsky wrote:
> Not just related to this patch, but here goes. While trying to debug an
> MTE-enabled process, I realised that there's no way to tell the tagged addr
> / MTE thread configuration from outside of the thread. At this point I
> thought it'd be really nice if this were to be exposed in /proc/pid, maybe
> in /proc/pid/status. Unfortunately there seems to be no precedent for an
> arch-specific feature to be exposed there. I guess a ptrace call would work
> as well, although it wouldn't be as practical without using a debugger.
There is proc_pid_arch_status(), currently only used by x86 to report
the avx512 status. We could do the same on arm64 and provide information
information on the MTE status, SVE configuration, ptrauth. I think this
can be a separate patch covering all these.
--
Catalin
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: linux-arch@vger.kernel.org,
Richard Earnshaw <Richard.Earnshaw@arm.com>,
Szabolcs Nagy <szabolcs.nagy@arm.com>,
Marc Zyngier <maz@kernel.org>,
linux-mm@kvack.org, Andrey Konovalov <andreyknvl@google.com>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Will Deacon <will@kernel.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 19/22] arm64: mte: Allow user control of the tag check mode via prctl()
Date: Wed, 12 Feb 2020 11:45:17 +0000 [thread overview]
Message-ID: <20200212114517.GF488264@arrakis.emea.arm.com> (raw)
In-Reply-To: <cdd9d203-00c8-0a63-69b5-66234c0e9d9a@arm.com>
On Fri, Dec 27, 2019 at 02:34:32PM +0000, Kevin Brodsky wrote:
> Not just related to this patch, but here goes. While trying to debug an
> MTE-enabled process, I realised that there's no way to tell the tagged addr
> / MTE thread configuration from outside of the thread. At this point I
> thought it'd be really nice if this were to be exposed in /proc/pid, maybe
> in /proc/pid/status. Unfortunately there seems to be no precedent for an
> arch-specific feature to be exposed there. I guess a ptrace call would work
> as well, although it wouldn't be as practical without using a debugger.
There is proc_pid_arch_status(), currently only used by x86 to report
the avx512 status. We could do the same on arm64 and provide information
information on the MTE status, SVE configuration, ptrauth. I think this
can be a separate patch covering all these.
--
Catalin
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next prev parent reply other threads:[~2020-02-12 11:45 UTC|newest]
Thread overview: 139+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 18:40 [PATCH 00/22] arm64: Memory Tagging Extension user-space support Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 01/22] mm: Reserve asm-generic prot flags 0x10 and 0x20 for arch use Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 19:26 ` Arnd Bergmann
2019-12-11 19:26 ` Arnd Bergmann
2019-12-11 19:26 ` Arnd Bergmann
2019-12-11 18:40 ` [PATCH 02/22] kbuild: Add support for 'as-instr' to be used in Kconfig files Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-12 5:03 ` Masahiro Yamada
2019-12-12 5:03 ` Masahiro Yamada
2019-12-12 5:03 ` Masahiro Yamada
2019-12-11 18:40 ` [PATCH 03/22] arm64: alternative: Allow alternative_insn to always issue the first instruction Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 04/22] arm64: Use macros instead of hard-coded constants for MAIR_EL1 Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 05/22] arm64: mte: system register definitions Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 06/22] arm64: mte: CPU feature detection and initial sysreg configuration Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 07/22] arm64: mte: Use Normal Tagged attributes for the linear map Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 08/22] arm64: mte: Assembler macros and default architecture for .S files Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 09/22] arm64: mte: Tags-aware clear_page() implementation Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 10/22] arm64: mte: Tags-aware copy_page() implementation Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 11/22] arm64: Tags-aware memcmp_pages() implementation Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 12/22] arm64: mte: Add specific SIGSEGV codes Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 19:31 ` Arnd Bergmann
2019-12-11 19:31 ` Arnd Bergmann
2019-12-11 19:31 ` Arnd Bergmann
2019-12-12 9:34 ` Catalin Marinas
2019-12-12 9:34 ` Catalin Marinas
2019-12-12 9:34 ` Catalin Marinas
2019-12-12 18:26 ` Eric W. Biederman
2019-12-12 18:26 ` Eric W. Biederman
2019-12-12 18:26 ` Eric W. Biederman
2019-12-17 17:48 ` Catalin Marinas
2019-12-17 17:48 ` Catalin Marinas
2019-12-17 17:48 ` Catalin Marinas
2019-12-17 20:06 ` Eric W. Biederman
2019-12-17 20:06 ` Eric W. Biederman
2019-12-17 20:06 ` Eric W. Biederman
2019-12-11 18:40 ` [PATCH 13/22] arm64: mte: Handle synchronous and asynchronous tag check faults Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-14 1:43 ` Peter Collingbourne
2019-12-14 1:43 ` Peter Collingbourne
2019-12-14 1:43 ` Peter Collingbourne
2019-12-17 18:01 ` Catalin Marinas
2019-12-17 18:01 ` Catalin Marinas
2019-12-17 18:01 ` Catalin Marinas
2019-12-20 1:36 ` [PATCH] arm64: mte: Do not service syscalls after async tag fault Peter Collingbourne
2019-12-20 1:36 ` Peter Collingbourne
2020-02-12 11:09 ` Catalin Marinas
2020-02-12 11:09 ` Catalin Marinas
2020-02-18 21:59 ` Peter Collingbourne
2020-02-18 21:59 ` Peter Collingbourne
2020-02-19 16:16 ` Catalin Marinas
2020-02-19 16:16 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 14/22] mm: Introduce arch_calc_vm_flag_bits() Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 15/22] arm64: mte: Add PROT_MTE support to mmap() and mprotect() Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2020-01-21 22:06 ` Peter Collingbourne
2020-01-21 22:06 ` Peter Collingbourne
2019-12-11 18:40 ` [PATCH 16/22] mm: Introduce arch_validate_flags() Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 17/22] arm64: mte: Validate the PROT_MTE request via arch_validate_flags() Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 18/22] mm: Allow arm64 mmap(PROT_MTE) on RAM-based files Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 19/22] arm64: mte: Allow user control of the tag check mode via prctl() Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-19 20:32 ` Peter Collingbourne
2019-12-19 20:32 ` Peter Collingbourne
2019-12-19 20:32 ` Peter Collingbourne
2019-12-20 1:48 ` [PATCH] arm64: mte: Clear SCTLR_EL1.TCF0 on exec Peter Collingbourne
2019-12-20 1:48 ` Peter Collingbourne
2020-02-12 17:03 ` Catalin Marinas
2020-02-12 17:03 ` Catalin Marinas
2019-12-27 14:34 ` [PATCH 19/22] arm64: mte: Allow user control of the tag check mode via prctl() Kevin Brodsky
2019-12-27 14:34 ` Kevin Brodsky
2019-12-27 14:34 ` Kevin Brodsky
2020-02-12 11:45 ` Catalin Marinas [this message]
2020-02-12 11:45 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 20/22] arm64: mte: Allow user control of the excluded tags " Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-16 14:20 ` Kevin Brodsky
2019-12-16 14:20 ` Kevin Brodsky
2019-12-16 14:20 ` Kevin Brodsky
2019-12-16 17:30 ` Peter Collingbourne
2019-12-16 17:30 ` Peter Collingbourne
2019-12-16 17:30 ` Peter Collingbourne
2019-12-17 17:56 ` Catalin Marinas
2019-12-17 17:56 ` Catalin Marinas
2019-12-17 17:56 ` Catalin Marinas
2020-06-22 17:17 ` Catalin Marinas
2020-06-22 19:00 ` Peter Collingbourne
2020-06-23 16:42 ` Catalin Marinas
2020-06-23 16:42 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 21/22] arm64: mte: Kconfig entry Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` [PATCH 22/22] arm64: mte: Add Memory Tagging Extension documentation Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-11 18:40 ` Catalin Marinas
2019-12-24 15:03 ` Kevin Brodsky
2019-12-24 15:03 ` Kevin Brodsky
2019-12-24 15:03 ` Kevin Brodsky
2019-12-13 18:05 ` [PATCH 00/22] arm64: Memory Tagging Extension user-space support Peter Collingbourne
2019-12-13 18:05 ` Peter Collingbourne
2019-12-13 18:05 ` Peter Collingbourne
2020-02-13 11:23 ` Catalin Marinas
2020-02-13 11:23 ` Catalin Marinas
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