Re: [PATCH 02/10] udev: Add watch perms

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On 2/16/20 3:03 PM, Jason Zaman wrote:
Udev watches all the fixed_disks and udevadm watches the runtime dir.

udevd[3010]: inotify_add_watch(6, /dev/sde, 10) failed: Permission denied

avc:  denied  { watch } for  pid=4669 comm="udevadm" path="/run/udev" dev="tmpfs" ino=19464 scontext=system_u:system_r:udevadm_t:s0 tcontext=system_u:object_r:udev_runtime_t:s0 tclass=dir permissive=0
avc:  denied  { watch } for  pid=3022 comm="udevd" path="/dev/loop3" dev="devtmpfs" ino=10247 scontext=system_u:system_r:udev_t:s0-s0:c0.c1023 tcontext=system_u:object_r:fixed_disk_device_t:s0 tclass=blk_file permissive=0
Signed-off-by: Jason Zaman <jason@xxxxxxxxxxxxx>
---
  policy/modules/kernel/storage.if | 20 ++++++++++++++++++++
  policy/modules/system/udev.te    |  3 +++
  2 files changed, 23 insertions(+)

diff --git a/policy/modules/kernel/storage.if b/policy/modules/kernel/storage.if
index c14bb13b..f9dcbaf5 100644
--- a/policy/modules/kernel/storage.if
+++ b/policy/modules/kernel/storage.if
@@ -364,6 +364,26 @@ interface(`storage_swapon_fixed_disk',`
  	allow $1 fixed_disk_device_t:blk_file getattr;
  ')
+########################################
+## <summary>
+##	Watch fixed disk device nodes.
+## </summary>
+## <param name="domain">
+##	<summary>
+##	Domain allowed access.
+##	</summary>
+## </param>
+#
+interface(`storage_watch_fixed_disk',`
+	gen_require(`
+		type fixed_disk_device_t;
+	')
+
+	dev_list_all_dev_nodes($1)
+	allow $1 fixed_disk_device_t:blk_file watch;
+	allow $1 fixed_disk_device_t:chr_file watch;
+')
+
  ########################################
  ## <summary>
  ##	Allow the caller to get the attributes
diff --git a/policy/modules/system/udev.te b/policy/modules/system/udev.te
index 0ccbcb51..e0e27a9d 100644
--- a/policy/modules/system/udev.te
+++ b/policy/modules/system/udev.te
@@ -154,6 +154,8 @@ selinux_compute_create_context(udev_t)
  selinux_compute_relabel_context(udev_t)
  selinux_compute_user_contexts(udev_t)
+storage_watch_fixed_disk(udev_t)
+
  auth_read_pam_console_data(udev_t)
  auth_domtrans_pam_console(udev_t)
  auth_use_nsswitch(udev_t)
@@ -401,6 +403,7 @@ delete_files_pattern(udevadm_t, udev_runtime_t, udev_runtime_t)
  delete_lnk_files_pattern(udevadm_t, udev_runtime_t, udev_runtime_t)
  list_dirs_pattern(udevadm_t, udev_runtime_t, udev_runtime_t)
  read_files_pattern(udevadm_t, udev_runtime_t, udev_runtime_t)
+allow udevadm_t udev_runtime_t:dir watch;
list_dirs_pattern(udevadm_t, udev_tbl_t, udev_tbl_t)
  read_files_pattern(udevadm_t, udev_tbl_t, udev_tbl_t)

Merged.

--
Chris PeBenito



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