linux-kernel - Re: kprobe: __blkdev

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20200619081954.3d72a252@oasis.local.home>
Date:   Fri, 19 Jun 2020 08:19:54 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Ming Lei <tom.leiming@...il.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        linux-block <linux-block@...r.kernel.org>
Subject: Re: kprobe: __blkdev_put probe is missed

On Fri, 19 Jun 2020 15:28:59 +0800
Ming Lei <ming.lei@...hat.com> wrote:

> > 
> > OK, then let's make events (for sure)
> > 
> > root@...note2:/sys/kernel/debug/tracing# echo p __blkdev_put >> kprobe_events 
> > root@...note2:/sys/kernel/debug/tracing# echo r __blkdev_put >> kprobe_events 
> > root@...note2:/sys/kernel/debug/tracing# echo p blkdev_put >> kprobe_events 

Hi Ming,

Do you have the kprobe_events file?

> > root@...note2:/sys/kernel/debug/tracing# echo 1 > events/kprobes/enable   
> 
> I can't find 'events/kprobes' in my VM with upstream kernel, also not found
> the dir under fedora31(5.5.15-200) & rhel8(v4.18 based).

The events/kprobes directly will be created when you create a
kprobe_event. It wont exist until then.

-- Steve