linux-kernel - Re: [PATCH] Transparently handle <.symbol> lookup for kprobes

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Message-ID: <17965.40145.647933.480761@cargo.ozlabs.ibm.com>
Date:	Tue, 24 Apr 2007 15:59:45 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Srinivasa Ds <srinivasa@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, ananth@...ibm.com,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] Transparently handle <.symbol> lookup for kprobes

Srinivasa Ds writes:

> +	} else {							\
> +		char dot_name[KSYM_NAME_LEN+1];				\
> +		dot_name[0] = '.';					\
> +		dot_name[1] = '\0';					\
> +		strncat(dot_name, name, KSYM_NAME_LEN);			\

Assuming the kernel strncat works like the userspace one does, there
is a possibility that dot_name[] won't be properly null-terminated
here.  If strlen(name) >= KSYM_NAME_LEN-1, then strncat will set
dot_name[KSYM_NAME_LEN-1] to something non-null and won't touch
dot_name[KSYM_NAME_LEN].

Paul.
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