linux-kernel - Re: [PATCH v5 2/2] tracing: remove igrab() iput() call from uprobes.c

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Date:   Thu, 26 Apr 2018 15:25:53 +0200
From:   Miklos Szeredi <miklos@...redi.hu>
To:     Song Liu <songliubraving@...com>
Cc:     linux-kernel@...r.kernel.org, kernel-team <kernel-team@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>,
        Howard McLauchlan <hmclauchlan@...com>,
        Josef Bacik <jbacik@...com>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Subject: Re: [PATCH v5 2/2] tracing: remove igrab() iput() call from uprobes.c

On Mon, Apr 23, 2018 at 7:21 PM, Song Liu <songliubraving@...com> wrote:
> Caller of uprobe_register is required to keep the inode and containing
> mount point referenced.
>
> There was misuse of igrab() in uprobes.c and trace_uprobe.c. This is
> because igrab() will not prevent umount of the containing mount point.
> To fix this, we added path to struct trace_uprobe, which keeps the inode
> and containing mount reference.
>
> For uprobes.c, it is not necessary to call igrab() in uprobe_register(),
> as the caller is required to keep the inode reference. The igrab() is
> removed and comments on this requirement is added to uprobe_register().
>
> Link: http://lkml.kernel.org/r/CAELBmZB2XX=qEOLAdvGG4cPx4GEntcSnWQquJLUK1ongRj35cA@mail.gmail.com
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Howard McLauchlan <hmclauchlan@...com>
> Cc: Josef Bacik <jbacik@...com>
> Cc: Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
> Cc: Miklos Szeredi <miklos@...redi.hu>
> Signed-off-by: Song Liu <songliubraving@...com>

Acked-by: Miklos Szeredi <mszeredi@...hat.com>