linux-kernel - Re: [PATCH 3/3] uprobes: make uprobe

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Message-ID: <20240711092619.GA18031@redhat.com>
Date: Thu, 11 Jul 2024 11:26:19 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: andrii@...nel.org, mhiramat@...nel.org, peterz@...radead.org
Cc: clm@...a.com, jolsa@...nel.org, mingo@...nel.org, paulmck@...nel.org,
	rostedt@...dmis.org, linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] uprobes: make uprobe_register() return struct uprobe
 *

On 07/10, Oleg Nesterov wrote:
>
> -void uprobe_unregister(struct inode *inode, loff_t offset, struct uprobe_consumer *uc)
> +void uprobe_unregister(struct uprobe *uprobe, struct uprobe_consumer *uc)
>  {
> -	struct uprobe *uprobe;
> -
> -	uprobe = find_uprobe(inode, offset);
> -	if (WARN_ON(!uprobe))
> -		return;
> -
>  	down_write(&uprobe->register_rwsem);
>  	__uprobe_unregister(uprobe, uc);
>  	up_write(&uprobe->register_rwsem);
> -	put_uprobe(uprobe);

OK, this is obviously wrong, needs get_uprobe/put_uprobe. __uprobe_unregister()
can free this uprobe, so up_write(&uprobe->register_rwsem) is not safe.

I'll send V2 on top of Peter's new version.

Oleg.