From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 459562C11C9; Fri, 23 Jan 2026 20:17:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769199428; cv=none; b=OWsdyaQ4vhMrMQjjPyCHuA/U4XX4n78MuvZoXhZaRHGw3r0sa/vo8xiCK3xo9Og+Gfh7hZJx+SytMrfCcnl5535GXVsmwZgRHSNOtGyl1O98n3MVpEcEaUpLF39kCUjZzeCEEQMyaaB2rLrvZPTUDv9pMIc32FsdOx7hefaOyW0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769199428; c=relaxed/simple; bh=W7fElqeXvLjGvdvBJvO01XNxYEd6W/KLt382xCvPQ8Q=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=kVTHeFjqSKgByP+rC1nzaZJOuhoJ/RiF2y0C64Z6rlrFbJjWNcQb8MbTxB5bzJtapT3zAjaHcEJd7dRmNllgIBBoZdL9FeVl3wzZcT5ZtbcDkC4ToNejojrOQoGcQhnpO/ZEdEjWnzhnPUJD9fnxgTdKL6acDme/PiIenz9wZkQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=hXlPRMs4; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="hXlPRMs4" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=vt1C7y6WfqXnSCjXstGpvtK6IOkDXE5Bg5gDzC2JlvE=; b=hXlPRMs4+JZtF9Dkhw1zfsvIZw egaGFK7HZyIt2OYbK5u0h09vvG9TG8dbUXeQ5ZB8zyK+KDNqGhYa9Fff3fqLWdAGWWg2sUKmZV3Uu pJkyVasOQinQAxvJk7waqyjxlDnJoWM8SWmXLqv5LuROOaRikICpY2mjCKZ29Ez0HZf+QBMiSz8qY x7QwGqF85a4n9Y8B0AD5hwpdW8Iu/AyC0YO7wt6CamyOZT5b+GqZnypNzwtnkx67h7vWwea2/hp0e rAnxAGCU0qck+KBdL+NxcP1S0fyRU51suYdjLuM72UtB9atYji+OLKLlu6NejuOXV8BxUNciQDKYS 4KQYMHDA==; Received: from [2001:8b0:10b::4] (helo=u09cd745991455d.ant.amazon.com) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vjNaQ-0000000300J-0KoM; Fri, 23 Jan 2026 20:16:58 +0000 Message-ID: Subject: Re: [v6,2/7] ptp: vmclock: support device notifications From: David Woodhouse To: Jakub Kicinski , itazur@amazon.com Cc: graf@amazon.de, itazur@amazon.co.uk, conor+dt@kernel.org, devicetree@vger.kernel.org, xmarcalx@amazon.co.uk, linux-kernel@vger.kernel.org, edumazet@google.com, robh@kernel.org, richardcochran@gmail.com, andrew+netdev@lunn.ch, mzxreary@0pointer.de, pabeni@redhat.com, netdev@vger.kernel.org, krzk+dt@kernel.org, davem@davemloft.net, mail@bchalios.io Date: Fri, 23 Jan 2026 12:16:46 -0800 In-Reply-To: <20260123031133.3059291-2-kuba@kernel.org> References: <20260121143402.3092-3-itazur@amazon.com> <20260123031133.3059291-2-kuba@kernel.org> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-N6jXm8iVxQHBPWb7ym/n" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-N6jXm8iVxQHBPWb7ym/n Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2026-01-22 at 19:11 -0800, Jakub Kicinski wrote: >=20 > > + status =3D acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTI= FY, > > + =C2=A0=C2=A0=C2=A0=C2=A0 vmclock_acpi_notification_handler, > > + =C2=A0=C2=A0=C2=A0=C2=A0 dev); >=20 > Since acpi_install_notify_handler() is called here, should there be a > corresponding acpi_remove_notify_handler() in vmclock_remove()? Currently > the handler remains registered after device removal, which could lead to > a use-after-free if the hypervisor sends a notification after the driver > state has been freed. >=20 > [ ... ] >=20 > > @@ -549,6 +653,11 @@ static int vmclock_probe(struct platform_device *p= dev) > > =C2=A0=C2=A0 if (ret) > > =C2=A0=C2=A0 return ret; > >=20 > > + init_waitqueue_head(&st->disrupt_wait); > > + ret =3D vmclock_setup_notification(dev, st); > > + if (ret) > > + return ret; >=20 > [ ... ] >=20 > > @@ -581,6 +690,8 @@ static int vmclock_probe(struct platform_device *pd= ev) > > =C2=A0=C2=A0 return -ENODEV; > > =C2=A0=C2=A0 } > >=20 > > + dev->driver_data =3D st; >=20 > Is there a race window here? The ACPI notification handler is installed > in vmclock_setup_notification() which runs earlier in vmclock_probe(), > but the handler accesses device->driver_data. If the hypervisor sends a > notification between vmclock_setup_notification() and this assignment, > vmclock_acpi_notification_handler() would dereference NULL or garbage. >=20 > I see this is fixed later in the series by commit 47fdd294385e which > moves dev->driver_data =3D st before vmclock_setup_notification(). With the incremental diff below, I've fixed both of these in https://git.infradead.org/?p=3Dusers/dwmw2/linux.git;a=3Dshortlog;h=3Drefs/= heads/vmclock Takahiro and Babis have the test environment set up to actually exercise the notifications, so I'll let one of them actually do the testing and repost v7. Takahiro, please remember to add your own 'Signed-off-by:' as you do. Thanks! --- a/drivers/ptp/ptp_vmclock.c +++ b/drivers/ptp/ptp_vmclock.c @@ -490,17 +490,6 @@ static const struct file_operations vmclock_miscdev_fo= ps =3D { =20 /* module operations */ =20 -static void vmclock_remove(void *data) -{ - struct vmclock_state *st =3D data; - - if (st->ptp_clock) - ptp_clock_unregister(st->ptp_clock); - - if (st->miscdev.minor !=3D MISC_DYNAMIC_MINOR) - misc_deregister(&st->miscdev); -} - #if IS_ENABLED(CONFIG_ACPI) static acpi_status vmclock_acpi_resources(struct acpi_resource *ares, void= *data) { @@ -636,6 +625,32 @@ static int vmclock_setup_notification(struct device *d= ev, return vmclock_setup_of_notification(dev); } =20 +static void vmclock_remove(void *data) +{ + struct device *dev =3D data; + struct vmclock_state *st =3D dev->driver_data; + + if (!st) { + dev_err(dev, "vmclock_remove() called with NULL driver_data"); + return; + } + +#if IS_ENABLED(CONFIG_ACPI) + if (has_acpi_companion(dev)) + acpi_remove_notify_handler(ACPI_COMPANION(dev)->handle, + ACPI_DEVICE_NOTIFY, + vmclock_acpi_notification_handler); +#endif + + if (st->ptp_clock) + ptp_clock_unregister(st->ptp_clock); + + if (st->miscdev.minor !=3D MISC_DYNAMIC_MINOR) + misc_deregister(&st->miscdev); + + dev->driver_data =3D NULL; +} + static void vmclock_put_idx(void *data) { struct vmclock_state *st =3D data; @@ -701,12 +716,13 @@ static int vmclock_probe(struct platform_device *pdev= ) =20 st->miscdev.minor =3D MISC_DYNAMIC_MINOR; =20 - ret =3D devm_add_action_or_reset(&pdev->dev, vmclock_remove, st); + init_waitqueue_head(&st->disrupt_wait); + dev->driver_data =3D st; + + ret =3D devm_add_action_or_reset(&pdev->dev, vmclock_remove, dev); if (ret) return ret; =20 - init_waitqueue_head(&st->disrupt_wait); - dev->driver_data =3D st; ret =3D vmclock_setup_notification(dev, st); if (ret) return ret; --=-N6jXm8iVxQHBPWb7ym/n Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 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