From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B0C435977 for ; Thu, 19 Feb 2026 01:29:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771464558; cv=none; b=QwwnmIiHqHep4+m3C6vjbUBSTMhqefUQPVqjX8wjSQGlGFTZ2wZu5We8wNpjGIjp+4ARvHN4trw8iq72bL9dNoFk0YHFTL0551o5UCAzjlJ1ibmWJB/0YBvb5r5KyyJS2oKQ+O7KfJpmaY673Bm8W5E1IRgIC+PTDdZ3p/TI4q4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771464558; c=relaxed/simple; bh=ydVZtfO+v6WOe6L1r/nUXf2QAOfjebGCuTpIv0twkM8=; h=Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References: Mime-Version:Content-Type; b=MyNOtg6cceSn5J+ttDzANR6HhK3YuPZqaE+2R+5fXstv5p8jZL3DXSE5IwHFHbPiwpZTzPrNe8BpFd3d9QElMK6drze7j7b8PonWGdM1AkG7RxESden1QgWcTGiRDzXf3/TxK8eiZV0VL117lAzz15RbxUlOiVfG7+9pubTlxTg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=OHmKpztF; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="OHmKpztF" Received: by smtp.kernel.org (Postfix) with ESMTPSA id EC5A0C116D0; Thu, 19 Feb 2026 01:29:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771464558; bh=ydVZtfO+v6WOe6L1r/nUXf2QAOfjebGCuTpIv0twkM8=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=OHmKpztF1KOfZZTBrrcKbvfVgHOa3t5GuKdTJNqglJ/EImcspsnaIpjVDm8n34ann yhIrpEUMzfkYmcilLuAllwi2xkvdasD6BkZQ3cPK/qGnvwDWM2IzF5BKtMQsDdOzKu a9vYdq7rxNX+DAI+cRkMAXSM0vX5HFvGmIcfBztJTBb5/UKO0ir8AIzIDERmgUrSxS EbExbAEsCYhGQWQYBvVqMhIVLmR3DTc/bvTGTv6JSj8OjMLGRQcCK535H+LJqxPD2h agPZMa1IW71QH29UhHMP0aOT4cknbEL0lXmz4QefD9MYcEO6GYaoOWay8++UImxxgh A5V+fTgsWVbhA== Date: Thu, 19 Feb 2026 10:29:15 +0900 From: Masami Hiramatsu (Google) To: "Elly I. Esparza" Cc: linux-kernel@vger.kernel.org, will@kernel.org, akpm@linux-foundation.org, ast@kernel.org, yangfeng@kylinos.cn, gregkh@linuxfoundation.org, hch@lst.de, qperret@google.com Subject: Re: [PATCH 2/2] kernel/kallsyms: Prevent bypassing of kprobes blacklist Message-Id: <20260219102915.2a79f0713032d95814eee79f@kernel.org> In-Reply-To: <20260218144819.24326-1-ellyesparza8@gmail.com> References: <20260218144819.24326-1-ellyesparza8@gmail.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 18 Feb 2026 11:48:19 -0300 "Elly I. Esparza" wrote: > Kprobes can be used to get the adress of kallsyms_lookup_name() providing > access to blacklisted symbols. > > Add kallsyms_lookup_name() to kprobes blacklist. NACK, this NOKPROBE_SYMBOL() should be used for the functions which is called inside the kprobe callback handler. kallsyms_lookup_name() is used when setting up the kprobe, not from the callbacks. Thanks, > > Signed-off-by: Elly I. Esparza > --- > kernel/kallsyms.c | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c > index 1e7635864124..13a7c0fdb5da 100644 > --- a/kernel/kallsyms.c > +++ b/kernel/kallsyms.c > @@ -234,6 +234,7 @@ unsigned long kallsyms_lookup_name(const char *name) > > return module_kallsyms_lookup_name(name); > } > +NOKPROBE_SYMBOL(kallsyms_lookup_name) > > /* > * Iterate over all symbols in vmlinux. For symbols from modules use > -- > 2.43.0 > -- Masami Hiramatsu (Google)