linux-kernel - Re: [PATCH v1 1/2] Missing instruction_pointer

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Message-ID: <CAMo8BfJBsU4xvUZe8HEJ=t8cYRh4RpQBqdustYRovjk4FUYsQg@mail.gmail.com>
Date:   Tue, 4 Aug 2020 14:31:39 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        jolsa@...nel.org, LKML <Linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>, kan.liang@...el.com,
        yao.jin@...el.com, alexander.shishkin@...ux.intel.com,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH v1 1/2] Missing instruction_pointer_set() instances

On Thu, Jul 30, 2020 at 7:59 PM Jin Yao <yao.jin@...ux.intel.com> wrote:
>
> There is a potential security issue that perf kernel samples
> may be leaked even though kernel sampling is disabled. For fixing
> the potential leakage, the idea is to use instruction_pointer_set
> to set invalid ip address in leaked perf samples in some cases.
>
> But instruction_pointer_set is missing on some architectures.
> Define instruction_pointer_set for these architectures.
>
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  arch/alpha/include/asm/ptrace.h  | 6 ++++++
>  arch/arc/include/asm/ptrace.h    | 6 ++++++
>  arch/nds32/include/asm/ptrace.h  | 7 +++++++
>  arch/xtensa/include/asm/ptrace.h | 6 ++++++
>  4 files changed, 25 insertions(+)

For xtensa:
Acked-by: Max Filippov <jcmvbkbc@...il.com>

-- 
Thanks.
-- Max