[pve-devel] [PATCH container/manager v3 0/2] add a deny-write option for device passthrough

[pve-devel] [PATCH container/manager v3 0/2] add a deny-write option for device passthrough

[Filip Schauer]

Add the deny-write options for device passthrough, to restrict container
access to devices.

This allows for passing through a device in read-only mode without
giving the container full access to it.

Up until now a container with a device passed through to it was granted
full access to that device without an option to restrict that access as
pointed out by @Fiona.

Changes since v1:
* set default values for deny_read & deny_write
* remove the deny_read checkbox from the UI, since it is expected to
  only have a very niche use case.

Changes since v2:
* remove the deny_read option due to a lack of use-cases
* rename deny_write to deny-write

pve-container:

Filip Schauer (1):
  add deny-write option for device passthrough

 src/PVE/LXC.pm        | 7 ++++++-
 src/PVE/LXC/Config.pm | 6 ++++++
 2 files changed, 12 insertions(+), 1 deletion(-)


pve-manager:

Filip Schauer (1):
  ui: lxc: add readonly option for device passthrough

 www/manager6/lxc/DeviceEdit.js | 8 ++++++++
 1 file changed, 8 insertions(+)


Summary over all repositories:
  3 files changed, 20 insertions(+), 1 deletions(-)

-- 
Generated by git-murpp 0.6.0


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[pve-devel] [PATCH container v3 1/2] add deny-write option for device passthrough

[Filip Schauer]

Add the deny-write options for device passthrough, to restrict container
access to devices.

Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
 src/PVE/LXC.pm        | 7 ++++++-
 src/PVE/LXC/Config.pm | 6 ++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm
index 65d0fa8..cb24f2d 100644
--- a/src/PVE/LXC.pm
+++ b/src/PVE/LXC.pm
@@ -651,7 +651,12 @@ sub update_lxc_config {
 	my $major = PVE::Tools::dev_t_major($rdev);
 	my $minor = PVE::Tools::dev_t_minor($rdev);
 	my $device_type_char = S_ISBLK($mode) ? 'b' : 'c';
-	$raw .= "lxc.cgroup2.devices.allow = $device_type_char $major:$minor rw\n";
+	my $allow_perms = "r" . $device->{'deny-write'} ? "" : "w";
+	$raw .= "lxc.cgroup2.devices.allow = $device_type_char $major:$minor $allow_perms\n";
+
+	if ($device->{'deny-write'}) {
+	    $raw .= "lxc.cgroup2.devices.deny = $device_type_char $major:$minor w\n";
+	}
     });
 
     # WARNING: DO NOT REMOVE this without making sure that loop device nodes
diff --git a/src/PVE/LXC/Config.pm b/src/PVE/LXC/Config.pm
index 1664a35..ce64c4c 100644
--- a/src/PVE/LXC/Config.pm
+++ b/src/PVE/LXC/Config.pm
@@ -962,6 +962,12 @@ my $dev_desc = {
 	minimum => 0,
 	description => 'Group ID to be assigned to the device node',
     },
+    'deny-write' => {
+	optional => 1,
+	type => 'boolean',
+	description => 'Deny the container to write to the device',
+	default => 0,
+    },
 };
 
 for (my $i = 0; $i < $MAX_DEVICES; $i++) {
-- 
2.39.2



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[pve-devel] applied: [PATCH container v3 1/2] add deny-write option for device passthrough

[Thomas Lamprecht]

Am 09/09/2024 um 14:50 schrieb Filip Schauer:
> Add the deny-write options for device passthrough, to restrict container
> access to devices.
> 
> Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
> ---
>  src/PVE/LXC.pm        | 7 ++++++-
>  src/PVE/LXC/Config.pm | 6 ++++++
>  2 files changed, 12 insertions(+), 1 deletion(-)
> 
>

applied, thanks!


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[pve-devel] [PATCH manager v3 2/2] ui: lxc: add readonly option for device passthrough

[Filip Schauer]

Add a checkbox to the device passthrough dialogue for restricting
write access to a device passed through to a container.

Signed-off-by: Filip Schauer <f.schauer@proxmox.com>
---
 www/manager6/lxc/DeviceEdit.js | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/www/manager6/lxc/DeviceEdit.js b/www/manager6/lxc/DeviceEdit.js
index cdbd9acc..9aadb2ff 100644
--- a/www/manager6/lxc/DeviceEdit.js
+++ b/www/manager6/lxc/DeviceEdit.js
@@ -95,6 +95,13 @@ Ext.define('PVE.lxc.DeviceInputPanel', {
 		return gettext("Access mode has to be an octal number");
 	    },
 	},
+	{
+	    xtype: 'checkbox',
+	    name: 'deny-write',
+	    fieldLabel: gettext('Read only'),
+	    labelWidth: 120,
+	    checked: false,
+	},
     ],
 });
 
@@ -145,6 +152,7 @@ Ext.define('PVE.lxc.DeviceEdit', {
 		    mode: data.mode,
 		    uid: data.uid,
 		    gid: data.gid,
+		    'deny-write': data['deny-write'],
 		};
 
 		ipanel.setValues(values);
-- 
2.39.2



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