All of lore.kernel.org
 help / color / mirror / Atom feed
From: Kuppuswamy Sathyanarayanan  <sathyanarayanan.kuppuswamy@linux.intel.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Borislav Petkov <bp@alien8.de>
Cc: x86@kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Andreas Noever <andreas.noever@gmail.com>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	Michael Jamet <michael.jamet@intel.com>,
	Yehezkel Bernat <YehezkelShB@gmail.com>,
	"Rafael J . Wysocki" <rafael@kernel.org>,
	Mika Westerberg <mika.westerberg@linux.intel.com>,
	Jonathan Corbet <corbet@lwn.net>,
	Jason Wang <jasowang@redhat.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Andi Kleen <ak@linux.intel.com>,
	Kuppuswamy Sathyanarayanan <knsathya@kernel.org>,
	linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org,
	linux-usb@vger.kernel.org,
	virtualization@lists.linux-foundation.org
Subject: [PATCH v2 3/6] driver core: Allow arch to initialize the authorized attribute
Date: Wed, 29 Sep 2021 18:05:08 -0700	[thread overview]
Message-ID: <20210930010511.3387967-4-sathyanarayanan.kuppuswamy@linux.intel.com> (raw)
In-Reply-To: <20210930010511.3387967-1-sathyanarayanan.kuppuswamy@linux.intel.com>

Authorized device attribute is used to authorize or deauthorize
the driver probe of the given device. Currently this attribute
is initialized to "true" (allow all) by default.

But for platforms like TDX guest, in which the host is an untrusted
entity, it has a requirement to disable all devices by default and
allow only a trusted list of devices with hardened drivers. So
define a variable "dev_default_authorization" which is used to
initialize the "authorized" attribute in device_initialize(). Also
allow arch code to override the default value by updating
dev_default_authorization value.

More discussion about the need for device/driver filter and the use
of allow list can be found in article [1] titled "firewall for
device drivers".

Also note that USB and Thunderbolt both override this initial value
in their respective device initializations so this is not a regression
for those buses.

[1] - https://lwn.net/Articles/865918/

Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
---
 drivers/base/core.c    | 7 +++++++
 include/linux/device.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/base/core.c b/drivers/base/core.c
index e65dd803a453..98717f00b90b 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -47,6 +47,12 @@ static int __init sysfs_deprecated_setup(char *arg)
 early_param("sysfs.deprecated", sysfs_deprecated_setup);
 #endif
 
+/*
+ * Default authorization status set as allow all. It can be
+ * overridden by arch code.
+ */
+bool __ro_after_init dev_default_authorization = true;
+
 /* Device links support. */
 static LIST_HEAD(deferred_sync);
 static unsigned int defer_sync_state_count = 1;
@@ -2855,6 +2861,7 @@ void device_initialize(struct device *dev)
 #ifdef CONFIG_SWIOTLB
 	dev->dma_io_tlb_mem = &io_tlb_default_mem;
 #endif
+	dev->authorized = dev_default_authorization;
 }
 EXPORT_SYMBOL_GPL(device_initialize);
 
diff --git a/include/linux/device.h b/include/linux/device.h
index 899be9a2c0cb..c97b1e59d23a 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -959,6 +959,8 @@ int devtmpfs_mount(void);
 static inline int devtmpfs_mount(void) { return 0; }
 #endif
 
+extern bool dev_default_authorization;
+
 /* drivers/base/power/shutdown.c */
 void device_shutdown(void);
 
-- 
2.25.1


  parent reply	other threads:[~2021-09-30  1:05 UTC|newest]

Thread overview: 132+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-30  1:05 [PATCH v2 0/6] Add device filter support Kuppuswamy Sathyanarayanan
2021-09-30  1:05 ` [PATCH v2 1/6] driver core: Move the "authorized" attribute from USB/Thunderbolt to core Kuppuswamy Sathyanarayanan
2021-09-30  1:42   ` Alan Stern
2021-09-30  1:42     ` Alan Stern
2021-09-30  1:55     ` Dan Williams
2021-09-30  1:55       ` Dan Williams
2021-09-30  2:38       ` Kuppuswamy, Sathyanarayanan
2021-09-30  4:59         ` Dan Williams
2021-09-30  4:59           ` Dan Williams
2021-09-30  9:05           ` Rafael J. Wysocki
2021-09-30  9:05             ` Rafael J. Wysocki
2021-09-30 14:59       ` Alan Stern
2021-09-30 14:59         ` Alan Stern
2021-09-30 15:25         ` Dan Williams
2021-09-30 15:25           ` Dan Williams
2021-09-30 11:19   ` Yehezkel Bernat
2021-09-30 15:28     ` Dan Williams
2021-09-30 15:28       ` Dan Williams
2021-09-30 18:25       ` Yehezkel Bernat
2021-09-30 19:04         ` Dan Williams
2021-09-30 19:04           ` Dan Williams
2021-09-30 19:50           ` Kuppuswamy, Sathyanarayanan
2021-09-30 20:23             ` Dan Williams
2021-09-30 20:23               ` Dan Williams
2021-09-30  1:05 ` [PATCH v2 2/6] driver core: Add common support to skip probe for un-authorized devices Kuppuswamy Sathyanarayanan
2021-09-30 10:59   ` Michael S. Tsirkin
2021-09-30 10:59     ` Michael S. Tsirkin
2021-09-30 13:52     ` Greg Kroah-Hartman
2021-09-30 13:52       ` Greg Kroah-Hartman
2021-09-30 14:38       ` Michael S. Tsirkin
2021-09-30 14:38         ` Michael S. Tsirkin
2021-09-30 14:49         ` Greg Kroah-Hartman
2021-09-30 14:49           ` Greg Kroah-Hartman
2021-09-30 15:00           ` Michael S. Tsirkin
2021-09-30 15:00             ` Michael S. Tsirkin
2021-09-30 15:22             ` Greg Kroah-Hartman
2021-09-30 15:22               ` Greg Kroah-Hartman
2021-09-30 17:17               ` Andi Kleen
2021-09-30 17:17                 ` Andi Kleen
2021-09-30 17:23                 ` Greg Kroah-Hartman
2021-09-30 17:23                   ` Greg Kroah-Hartman
2021-09-30 19:15                   ` Andi Kleen
2021-09-30 19:15                     ` Andi Kleen
2021-10-01  6:29                     ` Greg Kroah-Hartman
2021-10-01  6:29                       ` Greg Kroah-Hartman
2021-10-01 15:51                       ` Alan Stern
2021-10-01 15:51                         ` Alan Stern
2021-10-01 15:56                         ` Andi Kleen
2021-10-01 15:56                           ` Andi Kleen
2021-09-30 14:43       ` Alan Stern
2021-09-30 14:43         ` Alan Stern
2021-09-30 14:48         ` Michael S. Tsirkin
2021-09-30 14:48           ` Michael S. Tsirkin
2021-09-30 15:32           ` Alan Stern
2021-09-30 15:32             ` Alan Stern
2021-09-30 15:52             ` Michael S. Tsirkin
2021-09-30 15:52               ` Michael S. Tsirkin
2021-09-30 14:58         ` Michael S. Tsirkin
2021-09-30 14:58           ` Michael S. Tsirkin
2021-09-30 15:35           ` Alan Stern
2021-09-30 15:35             ` Alan Stern
2021-09-30 15:59             ` Michael S. Tsirkin
2021-09-30 15:59               ` Michael S. Tsirkin
2021-09-30 19:23               ` Andi Kleen
2021-09-30 19:23                 ` Andi Kleen
2021-09-30 20:44                 ` Alan Stern
2021-09-30 20:44                   ` Alan Stern
2021-09-30 20:52                   ` Dan Williams
2021-09-30 20:52                     ` Dan Williams
2021-10-01  1:41                     ` Alan Stern
2021-10-01  1:41                       ` Alan Stern
2021-10-01  2:20                       ` Dan Williams
2021-10-01  2:20                         ` Dan Williams
2021-09-30 21:12                   ` Andi Kleen
2021-09-30 21:12                     ` Andi Kleen
2021-09-30  1:05 ` Kuppuswamy Sathyanarayanan [this message]
2021-09-30  1:05 ` [PATCH v2 4/6] virtio: Initialize authorized attribute for confidential guest Kuppuswamy Sathyanarayanan
2021-09-30 11:03   ` Michael S. Tsirkin
2021-09-30 11:03     ` Michael S. Tsirkin
2021-09-30 13:36     ` Dan Williams
2021-09-30 13:36       ` Dan Williams
2021-09-30 13:49       ` Greg Kroah-Hartman
2021-09-30 13:49         ` Greg Kroah-Hartman
2021-09-30 15:18       ` Kuppuswamy, Sathyanarayanan
2021-09-30 15:20         ` Michael S. Tsirkin
2021-09-30 15:20           ` Michael S. Tsirkin
2021-09-30 15:23           ` Kuppuswamy, Sathyanarayanan
2021-09-30 15:23         ` Greg Kroah-Hartman
2021-09-30 15:23           ` Greg Kroah-Hartman
2021-09-30 19:04           ` Kuppuswamy, Sathyanarayanan
2021-09-30 19:16             ` Kuppuswamy, Sathyanarayanan
2021-09-30 19:30             ` Andi Kleen
2021-09-30 19:30               ` Andi Kleen
2021-09-30 19:40               ` Kuppuswamy, Sathyanarayanan
2021-10-01  7:03             ` Greg Kroah-Hartman
2021-10-01  7:03               ` Greg Kroah-Hartman
2021-10-01 15:49               ` Andi Kleen
2021-10-01 15:49                 ` Andi Kleen
2021-10-02 11:04                 ` Michael S. Tsirkin
2021-10-02 11:04                   ` Michael S. Tsirkin
2021-10-02 11:14                   ` Greg Kroah-Hartman
2021-10-02 11:14                     ` Greg Kroah-Hartman
2021-10-02 14:20                     ` Andi Kleen
2021-10-02 14:20                       ` Andi Kleen
2021-10-02 14:44                       ` Greg Kroah-Hartman
2021-10-02 14:44                         ` Greg Kroah-Hartman
2021-10-02 18:40                       ` Michael S. Tsirkin
2021-10-02 18:40                         ` Michael S. Tsirkin
2021-10-03  6:40                         ` Greg Kroah-Hartman
2021-10-03  6:40                           ` Greg Kroah-Hartman
2021-10-04 21:04                       ` Dan Williams
2021-10-04 21:04                         ` Dan Williams
2021-10-01 16:13               ` Dan Williams
2021-10-01 16:13                 ` Dan Williams
2021-10-01 16:45                 ` Alan Stern
2021-10-01 16:45                   ` Alan Stern
2021-10-01 18:09                   ` Dan Williams
2021-10-01 18:09                     ` Dan Williams
2021-10-01 19:00                     ` Alan Stern
2021-10-01 19:00                       ` Alan Stern
2021-10-01 19:45                       ` Kuppuswamy, Sathyanarayanan
2021-10-01 19:57                       ` Dan Williams
2021-10-01 19:57                         ` Dan Williams
2021-10-04  5:16                         ` Mika Westerberg
2021-10-05 22:33                           ` Dan Williams
2021-10-05 22:33                             ` Dan Williams
2021-10-06  5:45                             ` Greg Kroah-Hartman
2021-10-06  5:45                               ` Greg Kroah-Hartman
2021-09-30 19:25         ` Andi Kleen
2021-09-30 19:25           ` Andi Kleen
2021-09-30  1:05 ` [PATCH v2 5/6] x86/tdx: Add device filter support for x86 TDX guest platform Kuppuswamy Sathyanarayanan
2021-09-30  1:05 ` [PATCH v2 6/6] PCI: Initialize authorized attribute for confidential guest Kuppuswamy Sathyanarayanan

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20210930010511.3387967-4-sathyanarayanan.kuppuswamy@linux.intel.com \
    --to=sathyanarayanan.kuppuswamy@linux.intel.com \
    --cc=YehezkelShB@gmail.com \
    --cc=ak@linux.intel.com \
    --cc=andreas.noever@gmail.com \
    --cc=bhelgaas@google.com \
    --cc=bp@alien8.de \
    --cc=corbet@lwn.net \
    --cc=dan.j.williams@intel.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=jasowang@redhat.com \
    --cc=knsathya@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=linux-usb@vger.kernel.org \
    --cc=michael.jamet@intel.com \
    --cc=mika.westerberg@linux.intel.com \
    --cc=mingo@redhat.com \
    --cc=mst@redhat.com \
    --cc=rafael@kernel.org \
    --cc=tglx@linutronix.de \
    --cc=virtualization@lists.linux-foundation.org \
    --cc=x86@kernel.org \
    --subject='Re: [PATCH v2 3/6] driver core: Allow arch to initialize the authorized attribute' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.