From: Miroslav Benes <mbenes@suse.cz>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: linux-kernel@vger.kernel.org,
Masami Hiramatsu <mhiramat@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Jiri Kosina <jikos@kernel.org>, Petr Mladek <pmladek@suse.com>,
Joe Lawrence <joe.lawrence@redhat.com>,
live-patching@vger.kernel.org
Subject: Re: [PATCH 07/11 v3] livepatch: Trigger WARNING if livepatch function fails due to recursion
Date: Fri, 6 Nov 2020 11:07:24 +0100 (CET) [thread overview]
Message-ID: <alpine.LSU.2.21.2011061106090.10425@pobox.suse.cz> (raw)
In-Reply-To: <20201106023547.312639435@goodmis.org>
On Thu, 5 Nov 2020, Steven Rostedt wrote:
> From: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
>
> If for some reason a function is called that triggers the recursion
> detection of live patching, trigger a warning. By not executing the live
> patch code, it is possible that the old unpatched function will be called
> placing the system into an unknown state.
>
> Link: https://lore.kernel.org/r/20201029145709.GD16774@alley
>
> Cc: Josh Poimboeuf <jpoimboe@redhat.com>
> Cc: Jiri Kosina <jikos@kernel.org>
> Cc: Joe Lawrence <joe.lawrence@redhat.com>
> Cc: live-patching@vger.kernel.org
> Suggested-by: Miroslav Benes <mbenes@suse.cz>
> Reviewed-by: Petr Mladek <pmladek@suse.com>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Acked-by: Miroslav Benes <mbenes@suse.cz>
> ---
> Changes since v2:
>
> - Blame Miroslav instead of Petr ;-)
Thanks. Fortunately, if printk is broken in WARN_ON_ONCE(), I can always
blame Petr again :)
M
next prev parent reply other threads:[~2020-11-06 10:07 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201106023235.367190737@goodmis.org>
2020-11-06 2:32 ` [PATCH 06/11 v3] livepatch/ftrace: Add recursion protection to the ftrace callback Steven Rostedt
2020-11-06 10:05 ` Miroslav Benes
2020-11-06 2:32 ` [PATCH 07/11 v3] livepatch: Trigger WARNING if livepatch function fails due to recursion Steven Rostedt
2020-11-06 10:07 ` Miroslav Benes [this message]
2020-11-06 2:32 ` [PATCH 11/11 v3] ftrace: Add recording of functions that caused recursion Steven Rostedt
2020-11-06 13:13 ` Petr Mladek
2020-11-06 13:41 ` Steven Rostedt
2020-11-06 14:27 ` Petr Mladek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=alpine.LSU.2.21.2011061106090.10425@pobox.suse.cz \
--to=mbenes@suse.cz \
--cc=akpm@linux-foundation.org \
--cc=jikos@kernel.org \
--cc=joe.lawrence@redhat.com \
--cc=jpoimboe@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=live-patching@vger.kernel.org \
--cc=mhiramat@kernel.org \
--cc=mingo@kernel.org \
--cc=peterz@infradead.org \
--cc=pmladek@suse.com \
--cc=rostedt@goodmis.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).