linux-kernel - Re: [PATCH 4/6] ptrace_get_syscall_info: factor out ptrace_get_syscall_info

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Message-ID: <20250109100943.GA26424@redhat.com>
Date: Thu, 9 Jan 2025 11:09:44 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: "Dmitry V. Levin" <ldv@...ace.io>
Cc: Eugene Syromyatnikov <evgsyr@...il.com>,
	Mike Frysinger <vapier@...too.org>,
	Renzo Davoli <renzo@...unibo.it>,
	Davide Berardi <berardi.dav@...il.com>,
	strace-devel@...ts.strace.io, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/6] ptrace_get_syscall_info: factor out
 ptrace_get_syscall_info_op

On 01/08, Dmitry V. Levin wrote:
>
> +static int
> +ptrace_get_syscall_info(struct task_struct *child, unsigned long user_size,
> +			void __user *datavp)
> +{
> +	struct pt_regs *regs = task_pt_regs(child);
> +	struct ptrace_syscall_info info = {
> +		.op = ptrace_get_syscall_info_op(child),
> +		.arch = syscall_get_arch(child),
> +		.instruction_pointer = instruction_pointer(regs),
> +		.stack_pointer = user_stack_pointer(regs),
> +	};
> +	unsigned long actual_size = offsetof(struct ptrace_syscall_info, entry);
> +	unsigned long write_size;
> +
> +	switch (info.op) {
> +	case PTRACE_SYSCALL_INFO_ENTRY:
> +		actual_size = ptrace_get_syscall_info_entry(child, regs, &info);
> +		break;
> +	case PTRACE_SYSCALL_INFO_EXIT:
> +		actual_size = ptrace_get_syscall_info_exit(child, regs, &info);
> +		break;
> +	case PTRACE_SYSCALL_INFO_SECCOMP:
> +		actual_size = ptrace_get_syscall_info_seccomp(child, regs, &info);
>  		break;

OK... but unless I misread this patch, all 3 ptrace_get_syscall_info_xxx()
helpers will do the pointless info->op = PTRACE_SYSCALL_INFO_XXX ?

Oleg.