From: Albert Cahalan <albert@users.sf.net>
To: linux-kernel mailing list <linux-kernel@vger.kernel.org>
Subject: unsafe printk
Date: 16 Oct 2003 21:36:18 -0400 [thread overview]
Message-ID: <1066354577.15921.111.camel@cube> (raw)
Suppose I name an executable this:
"\n<0>Oops: EIP=0"
That comes out as a KERN_EMERG log message,
hitting the console and maybe a pager even.
There seem to be a number of places in the
kernel that printk current->comm without
concern for what it may contain.
Escape codes and non-ASCII can make for some
interesting log messages as well. Terminals
may have some programmable keys or answerback
messages. So one day root is using grep on
the log files, and they program the answerback
string to contain a "\r\nrm -r /\r\n"...
BTW, the 0x9b character is often an escape.
next reply other threads:[~2003-10-17 1:50 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-10-17 1:36 Albert Cahalan [this message]
2003-10-17 9:52 ` unsafe printk Pavel Machek
2003-10-17 23:52 ` Albert Cahalan
2003-10-17 12:38 ` Richard B. Johnson
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