linux-kernel - Re: [PATCH 2/6] ptrace: introduce ptrace_syscall_enter to consolidate PTRACE

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Date:   Mon, 4 Mar 2019 08:03:47 +0000
From:   "Haibo Xu (Arm Technology China)" <Haibo.Xu@....com>
To:     Sudeep Holla <Sudeep.Holla@....com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
CC:     Catalin Marinas <Catalin.Marinas@....com>,
        Will Deacon <Will.Deacon@....com>,
        Oleg Nesterov <oleg@...hat.com>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Richard Weinberger <richard@....at>,
        "jdike@...toit.com" <jdike@...toit.com>,
        Steve Capper <Steve.Capper@....com>,
        "Bin Lu (Arm Technology China)" <Bin.Lu@....com>
Subject: Re: [PATCH 2/6] ptrace: introduce ptrace_syscall_enter to consolidate
 PTRACE_SYSEMU handling

On 2019/3/1 2:32, Sudeep Holla wrote:
> Currently each architecture handles PTRACE_SYSEMU in very similar way.
> It's completely arch independent and can be handled in the code helping
> to consolidate PTRACE_SYSEMU handling.
>
> Let's introduce a hook 'ptrace_syscall_enter' that arch specific syscall
> entry code can call.
>

The 'ptrace_syscall_enter' is dedicated for PTRACE_SYSEMU flag,
So I suggest to rename the function to something like 'ptrace_syscall_emu_enter".

> +/*
> + * Hook to check and report for PTRACE_SYSEMU, can be called from arch
> + * arch syscall entry code
> + */
> +long ptrace_syscall_enter(struct pt_regs *regs)
> +{
> +#ifdef TIF_SYSCALL_EMU
> +if (test_thread_flag(TIF_SYSCALL_EMU)) {
> +if (tracehook_report_syscall_entry(regs));

Shall we remove the semi-colon at end of the above line?

> +return -1L;
> +}
> +#endif
> +return 0;
> +}
> +
>  /*
>   * Detach all tasks we were using ptrace on. Called with tasklist held
>   * for writing.
>
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