linux-kernel - [PATCH 2/2] audit: Handle embedded NUL in TTY input auditing

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Date:	Thu, 11 Sep 2008 00:29:33 +0200
From:	Miloslav Trmač <mitr@...hat.com>
To:	viro@...iv.linux.org.uk, Eric Paris <eparis@...hat.com>
Cc:	linux-audit <linux-audit@...hat.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/2] audit: Handle embedded NUL in TTY input auditing

From: Miloslav Trmac <mitr@...hat.com>

Data read from a TTY can contain an embedded NUL byte (e.g. after
pressing Ctrl-2, or sent to a PTY).  After the previous patch, the data
would be logged only up to the first NUL.

This patch modifies the AUDIT_TTY record to always use the hexadecimal
format, which does not terminate at the first NUL byte.  The vast
majority of recorded TTY input data will contain either ' ' or '\n', so
the hexadecimal format would have been used anyway.

Signed-off-by: Miloslav Trmac <mitr@...hat.com>
---
 tty_audit.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/char/tty_audit.c b/drivers/char/tty_audit.c
index 3582f43..5787249 100644
--- a/drivers/char/tty_audit.c
+++ b/drivers/char/tty_audit.c
@@ -93,7 +93,7 @@ static void tty_audit_buf_push(struct task_struct *tsk, uid_t loginuid,
 		get_task_comm(name, tsk);
 		audit_log_untrustedstring(ab, name);
 		audit_log_format(ab, " data=");
-		audit_log_n_untrustedstring(ab, buf->data, buf->valid);
+		audit_log_n_hex(ab, buf->data, buf->valid);
 		audit_log_end(ab);
 	}
 	buf->valid = 0;


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