systemd/systemd-197-revert-only-add-support.patch

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2023-12-30 11:35:14 +01:00
From 48a849ee17fb25e0001bfcc0f28a4aa633d016a1 Mon Sep 17 00:00:00 2001
From: Kay Sievers <kay@vrfy.org>
Date: Fri, 04 Jan 2013 15:15:46 +0000
Subject: udev: set device node permissions only at "add" events
---
diff --git a/TODO b/TODO
index 8ebb951..35d96ec 100644
--- a/TODO
+++ b/TODO
@@ -29,8 +29,6 @@ Features:
* exec: when deinitializating a tty device fix the perms and group, too, not only when initializing. Set access mode/gid to 0620/tty.
-* udev: only reset mode/gid of /dev/tty1 and friends on ACTION=add, not ACTION=changed
-
* DeviceAllow/DeviceDeny: disallow everything by default, but whitelist /dev/zero, /dev/null and friends
* service: watchdog logic: for testing purposes allow ping, but do not require pong
diff --git a/src/udev/udev-node.c b/src/udev/udev-node.c
index 7774303..1e378ad 100644
--- a/src/udev/udev-node.c
+++ b/src/udev/udev-node.c
@@ -279,22 +279,23 @@ static int node_fixup(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid
goto out;
}
- if ((stats.st_mode & 0777) != (mode & 0777) || stats.st_uid != uid || stats.st_gid != gid) {
- log_debug("set permissions %s, %#o, uid=%u, gid=%u\n", devnode, mode, uid, gid);
- chmod(devnode, mode);
- chown(devnode, uid, gid);
- } else {
- log_debug("preserve permissions %s, %#o, uid=%u, gid=%u\n", devnode, mode, uid, gid);
- }
-
/*
- * Set initial selinux file context only on add events.
- * We set the proper context on bootup (triger) or for newly
- * added devices, but we don't change it later, in case
- * something else has set a custom context in the meantime.
+ * Set permissions and selinux file context only on add events. We always
+ * set it on bootup (coldplug) with "trigger --action=add" for all devices
+ * and for any newly added devices (hotplug). We don't want to change it
+ * later, in case something else has applied custom settings in the meantime.
*/
- if (strcmp(udev_device_get_action(dev), "add") == 0)
- label_fix(devnode, true, false);
+ if (strcmp(udev_device_get_action(dev), "add") == 0) {
+ if ((stats.st_mode & 0777) != (mode & 0777) || stats.st_uid != uid || stats.st_gid != gid) {
+ log_debug("set permissions %s, %#o, uid=%u, gid=%u\n", devnode, mode, uid, gid);
+ chmod(devnode, mode);
+ chown(devnode, uid, gid);
+ } else {
+ log_debug("preserve permissions %s, %#o, uid=%u, gid=%u\n", devnode, mode, uid, gid);
+ }
+
+ label_fix(devnode, true, false);
+ }
/* always update timestamp when we re-use the node, like on media change events */
utimensat(AT_FDCWD, devnode, NULL, 0);
--
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