linux-kernel - Re: [for-next][PATCH 08/12] tracing: Add binary & filter for events

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: <51C2B8AB.8060709@broadcom.com>
Date:	Thu, 20 Jun 2013 10:09:15 +0200
From:	"Arend van Spriel" <arend@...adcom.com>
To:	"Steven Rostedt" <rostedt@...dmis.org>
cc:	linux-kernel@...r.kernel.org, "Ingo Molnar" <mingo@...nel.org>,
	"Frederic Weisbecker" <fweisbec@...il.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [for-next][PATCH 08/12] tracing: Add binary & filter for
 events

On 06/20/2013 05:35 AM, Steven Rostedt wrote:
> By allowing a binary '&' operation, this gives the user the ability to
> test a bit.
>
> Note, a binary '|' is not added, as it doesn't make sense as fields must
> be compared to constants (for now), and ORing a constant will always return
> true.
>
> Link:http://lkml.kernel.org/r/1371057385.9844.261.camel@gandalf.local.home
>
> Suggested-by: Arend van Spriel<arend@...adcom.com>

Actually, my attempt was triggered by the trace-cmd manual page:

"-f filter
Specify a filter for the previous event. This must come after a -e. This 
will filter what events get recorded based on the content of the event. 
Filtering is passed to the kernel directly so what filtering is allowed 
may depend on what version of the kernel you have. Basically, it will 
let you use C notation to check if an event should be processed or not.

==, >=, <=, >, <, &, |, && and ||

The above are usually safe to use to compare fields."

> Tested-by: Arend van Spriel<arend@...adcom.com>
> Signed-off-by: Steven Rostedt<rostedt@...dmis.org>

Regards,
Arend

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/