linux-kernel - about use wild cards for set_ftrace

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-next>] [day] [month] [year] [list]

Message-ID: <20081127152124.GA24616@ubuntu.mshome.net>
Date:	Thu, 27 Nov 2008 23:21:24 +0800
From:	walimis <walimisdev@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org
Subject: about use wild cards for set_ftrace_filter and so on

Hi Steven and Ingo,

I encountered an issue when using ftrace.
We know that we can use wild cards to set set_ftrace_filter, but there's 
problem when using such as "echo h* > /debug/tracing/set_ftrace_filter".
If there are files named with "h" prefix in current directory, echo "h*" 
will echo these files' name to set_ftrace_filter, not "h*".
For example:

#cat /debug/tracing/available_filter_functions |grep ^hr |wc -l
23
#ls
#touch hraa hrdd
#ls 
hraa  hrdd
#echo hr* > /debug/tracing/set_ftrace_filter
#cat /debug/tracing/set_ftrace_filter

No output in /debug/tracing/set_ftrace_filter!
If we use "" to enclose wild cards, it works:

#ls 
hraa  hrdd
#echo "hr*" > /debug/tracing/set_ftrace_filter
#cat /debug/tracing/set_ftrace_filter |wc -l 
23

This problem can lead to unexpected result if current directory has a 
lot of files.
I suppose that we can add some notes to document, so a patch attached.

View attachment "0001-Impact-imporve-document.patch" of type "text/x-diff" (627 bytes)