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From: Luis Machado <luis.machado@linaro.org>
To: Catalin Marinas <catalin.marinas@arm.com>,
	linux-arm-kernel@lists.infradead.org
Cc: Will Deacon <will@kernel.org>,
	Vincenzo Frascino <vincenzo.frascino@arm.com>,
	Szabolcs Nagy <szabolcs.nagy@arm.com>,
	Richard Earnshaw <Richard.Earnshaw@arm.com>,
	Kevin Brodsky <kevin.brodsky@arm.com>,
	Andrey Konovalov <andreyknvl@google.com>,
	Peter Collingbourne <pcc@google.com>,
	linux-mm@kvack.org, linux-arch@vger.kernel.org,
	Alan Hayward <Alan.Hayward@arm.com>,
	Omair Javaid <omair.javaid@linaro.org>
Subject: Re: [PATCH v3 19/23] arm64: mte: Add PTRACE_{PEEK,POKE}MTETAGS support
Date: Tue, 5 May 2020 15:03:29 -0300	[thread overview]
Message-ID: <b78fe0c4-f89e-9347-7d7d-a68085f70b1d@linaro.org> (raw)
In-Reply-To: <20200421142603.3894-20-catalin.marinas@arm.com>

On 4/21/20 11:25 AM, Catalin Marinas wrote:
> Add support for bulk setting/getting of the MTE tags in a tracee's
> address space at 'addr' in the ptrace() syscall prototype. 'data' points
> to a struct iovec in the tracer's address space with iov_base
> representing the address of a tracer's buffer of length iov_len. The
> tags to be copied to/from the tracer's buffer are stored as one tag per
> byte.
> 
> On successfully copying at least one tag, ptrace() returns 0 and updates
> the tracer's iov_len with the number of tags copied. In case of error,
> either -EIO or -EFAULT is returned, trying to follow the ptrace() man
> page.
> 
> Note that the tag copying functions are not performance critical,
> therefore they lack optimisations found in typical memory copy routines.
> 
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Alan Hayward <Alan.Hayward@arm.com>
> Cc: Luis Machado <luis.machado@linaro.org>
> Cc: Omair Javaid <omair.javaid@linaro.org>
> ---
> 
> Notes:
>      New in v3.
> 
>   arch/arm64/include/asm/mte.h         |  17 ++++
>   arch/arm64/include/uapi/asm/ptrace.h |   3 +
>   arch/arm64/kernel/mte.c              | 127 +++++++++++++++++++++++++++
>   arch/arm64/kernel/ptrace.c           |  15 +++-
>   arch/arm64/lib/mte.S                 |  50 +++++++++++
>   5 files changed, 211 insertions(+), 1 deletion(-)

I'll try to exercise the new ptrace requests with QEMU and GDB.


  parent reply	other threads:[~2020-05-05 18:03 UTC|newest]

Thread overview: 81+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21 14:25 [PATCH v3 00/23] arm64: Memory Tagging Extension user-space support Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 01/23] arm64: alternative: Allow alternative_insn to always issue the first instruction Catalin Marinas
2020-04-27 16:57   ` Dave Martin
2020-04-28 11:43     ` Catalin Marinas
2020-04-29 10:26       ` Dave Martin
2020-04-29 14:04         ` Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 02/23] arm64: mte: system register definitions Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 03/23] arm64: mte: CPU feature detection and initial sysreg configuration Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 04/23] arm64: mte: Use Normal Tagged attributes for the linear map Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 05/23] arm64: mte: Assembler macros and default architecture for .S files Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 06/23] arm64: mte: Tags-aware clear_page() implementation Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 07/23] arm64: mte: Tags-aware copy_page() implementation Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 08/23] arm64: Tags-aware memcmp_pages() implementation Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 09/23] arm64: mte: Add specific SIGSEGV codes Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 10/23] arm64: mte: Handle synchronous and asynchronous tag check faults Catalin Marinas
2020-04-23 10:38   ` Catalin Marinas
2020-04-27 16:58   ` Dave Martin
2020-04-28 13:43     ` Catalin Marinas
2020-04-29 10:26       ` Dave Martin
2020-04-21 14:25 ` [PATCH v3 11/23] mm: Introduce arch_calc_vm_flag_bits() Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 12/23] arm64: mte: Add PROT_MTE support to mmap() and mprotect() Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 13/23] mm: Introduce arch_validate_flags() Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 14/23] arm64: mte: Validate the PROT_MTE request via arch_validate_flags() Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 15/23] mm: Allow arm64 mmap(PROT_MTE) on RAM-based files Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 16/23] arm64: mte: Allow user control of the tag check mode via prctl() Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 17/23] arm64: mte: Allow user control of the generated random tags " Catalin Marinas
2020-04-21 14:25 ` [PATCH v3 18/23] arm64: mte: Restore the GCR_EL1 register after a suspend Catalin Marinas
2020-04-23 15:23   ` Lorenzo Pieralisi
2020-04-21 14:25 ` [PATCH v3 19/23] arm64: mte: Add PTRACE_{PEEK,POKE}MTETAGS support Catalin Marinas
2020-04-24 23:28   ` Peter Collingbourne
2020-04-29 10:27   ` Kevin Brodsky
2020-04-29 15:24     ` Catalin Marinas
2020-04-29 16:46   ` Dave Martin
2020-04-30 10:21     ` Catalin Marinas
2020-05-04 16:40       ` Dave Martin
2020-05-05 18:03   ` Luis Machado [this message]
2020-05-12 19:05   ` Luis Machado
2020-05-13 10:48     ` Catalin Marinas
2020-05-13 12:52       ` Luis Machado
2020-05-13 14:11         ` Catalin Marinas
2020-05-13 15:09           ` Luis Machado
2020-05-13 16:45             ` Luis Machado
2020-05-13 17:11               ` Catalin Marinas
2020-05-18 16:47               ` Dave Martin
2020-05-18 17:12                 ` Luis Machado
2020-05-19 16:10                   ` Catalin Marinas
2020-04-21 14:26 ` [PATCH v3 20/23] fs: Allow copy_mount_options() to access user-space in a single pass Catalin Marinas
2020-04-21 15:29   ` Al Viro
2020-04-21 16:45     ` Catalin Marinas
2020-04-27 16:56   ` Dave Martin
2020-04-28 14:06     ` Catalin Marinas
2020-04-29 10:28       ` Dave Martin
2020-04-28 18:16   ` Kevin Brodsky
2020-04-28 19:40     ` Catalin Marinas
2020-04-29 11:58     ` Catalin Marinas
2020-04-28 19:36   ` Catalin Marinas
2020-04-29 10:26   ` Dave Martin
2020-04-29 13:52     ` Catalin Marinas
2020-05-04 16:40       ` Dave Martin
2020-04-21 14:26 ` [PATCH v3 21/23] arm64: mte: Check the DT memory nodes for MTE support Catalin Marinas
2020-04-24 13:57   ` Catalin Marinas
2020-04-24 16:17     ` Catalin Marinas
2020-04-27 11:14       ` Suzuki K Poulose
2020-04-21 14:26 ` [PATCH v3 22/23] arm64: mte: Kconfig entry Catalin Marinas
2020-04-21 14:26 ` [PATCH v3 23/23] arm64: mte: Add Memory Tagging Extension documentation Catalin Marinas
2020-04-29 16:47   ` Dave Martin
2020-04-30 16:23     ` Catalin Marinas
2020-05-04 16:46       ` Dave Martin
2020-05-11 16:40         ` Catalin Marinas
2020-05-13 15:48           ` Dave Martin
2020-05-14 11:37             ` Catalin Marinas
2020-05-15 10:38               ` Catalin Marinas
2020-05-15 11:14                 ` Szabolcs Nagy
2020-05-15 11:27                   ` Catalin Marinas
2020-05-15 12:04                     ` Szabolcs Nagy
2020-05-15 12:13                       ` Catalin Marinas
2020-05-15 12:53                         ` Szabolcs Nagy
2020-05-18 16:52                           ` Dave Martin
2020-05-18 17:13               ` Catalin Marinas
2020-05-05 10:32   ` Szabolcs Nagy
2020-05-05 17:30     ` Catalin Marinas

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