1thumb_selinux(8) SELinux Policy thumb thumb_selinux(8)
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6 thumb_selinux - Security Enhanced Linux Policy for the thumb processes
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9 Security-Enhanced Linux secures the thumb processes via flexible manda‐
10 tory access control.
11 The thumb processes execute with the thumb_t SELinux type. You can
13 check if you have these processes running by executing the ps command
14 with the -Z qualifier.
15 For example:
17 ps -eZ | grep thumb_t
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23 The thumb_t SELinux type can be entered via the thumb_exec_t file type.
24 The default entrypoint paths for the thumb_t domain are the following:
26 /usr/bin/[^/]*thumbnailer, /usr/bin/gnome-[^/]*-thumbnailer(.sh)?,
28 /usr/lib/tumbler-?[^/]*/tumblerd, /usr/bin/raw-thumbnailer,
29 /usr/bin/ffmpegthumbnailer, /usr/bin/whaaw-thumbnailer,
30 /usr/bin/evince-thumbnailer, /usr/bin/mate-thumbnail-font,
31 /usr/bin/gnome-thumbnail-font, /usr/bin/gsf-office-thumbnailer,
32 /usr/bin/totem-video-thumbnailer, /usr/bin/shotwell-video-thumbnailer
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35 SELinux defines process types (domains) for each process running on the
36 system
37 You can see the context of a process using the -Z option to ps
39 Policy governs the access confined processes have to files. SELinux
41 thumb policy is very flexible allowing users to setup their thumb pro‐
42 cesses in as secure a method as possible.
43 The following process types are defined for thumb:
45 thumb_t
47 Note: semanage permissive -a thumb_t can be used to make the process
49 type thumb_t permissive. SELinux does not deny access to permissive
50 process types, but the AVC (SELinux denials) messages are still gener‐
51 ated.
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55 SELinux policy is customizable based on least access required. thumb
56 policy is extremely flexible and has several booleans that allow you to
57 manipulate the policy and run thumb with the tightest access possible.
58 If you want to deny user domains applications to map a memory region as
62 both executable and writable, this is dangerous and the executable
63 should be reported in bugzilla, you must turn on the deny_execmem bool‐
64 ean. Disabled by default.
65 setsebool -P deny_execmem 1
67 If you want to allow system to run with NIS, you must turn on the
71 nis_enabled boolean. Disabled by default.
72 setsebool -P nis_enabled 1
74 If you want to allow all unconfined executables to use libraries re‐
78 quiring text relocation that are not labeled textrel_shlib_t, you must
79 turn on the selinuxuser_execmod boolean. Enabled by default.
80 setsebool -P selinuxuser_execmod 1
82
86 The SELinux process type thumb_t can manage files labeled with the fol‐
87 lowing file types. The paths listed are the default paths for these
88 file types. Note the processes UID still need to have DAC permissions.
89 cifs_t
91 ecryptfs_t
94 /home/[^/]+/.Private(/.*)?
96 /home/[^/]+/.ecryptfs(/.*)?
97 fusefs_t
99 /var/run/user/[0-9]+/gvfs
101 nfs_t
103
107 SELinux requires files to have an extended attribute to define the file
108 type.
109 You can see the context of a file using the -Z option to ls
111 Policy governs the access confined processes have to these files.
113 SELinux thumb policy is very flexible allowing users to setup their
114 thumb processes in as secure a method as possible.
115 STANDARD FILE CONTEXT
117 SELinux defines the file context types for the thumb, if you wanted to
119 store files with these types in a different paths, you need to execute
120 the semanage command to specify alternate labeling and then use re‐
121 storecon to put the labels on disk.
122 semanage fcontext -a -t thumb_exec_t '/srv/thumb/content(/.*)?'
124 restorecon -R -v /srv/mythumb_content
125 Note: SELinux often uses regular expressions to specify labels that
127 match multiple files.
128 The following file types are defined for thumb:
130 thumb_exec_t
134 - Set files with the thumb_exec_t type, if you want to transition an
136 executable to the thumb_t domain.
137 Paths:
140 /usr/bin/[^/]*thumbnailer, /usr/bin/gnome-[^/]*-thumbnailer(.sh)?,
141 /usr/lib/tumbler-?[^/]*/tumblerd, /usr/bin/raw-thumbnailer,
142 /usr/bin/ffmpegthumbnailer, /usr/bin/whaaw-thumbnailer,
143 /usr/bin/evince-thumbnailer, /usr/bin/mate-thumbnail-font,
144 /usr/bin/gnome-thumbnail-font, /usr/bin/gsf-office-thumbnailer,
145 /usr/bin/totem-video-thumbnailer, /usr/bin/shotwell-video-thumb‐
146 nailer
147 thumb_home_t
150 - Set files with the thumb_home_t type, if you want to store thumb
152 files in the users home directory.
153 Paths:
156 /home/[^/]+/.thumbnails(/.*)?, /home/[^/]+/missfont.log.*,
157 /home/[^/]+/.cache/thumbnails(/.*)?
158 thumb_tmp_t
161 - Set files with the thumb_tmp_t type, if you want to store thumb tem‐
163 porary files in the /tmp directories.
164 thumb_tmpfs_t
168 - Set files with the thumb_tmpfs_t type, if you want to store thumb
170 files on a tmpfs file system.
171 Note: File context can be temporarily modified with the chcon command.
175 If you want to permanently change the file context you need to use the
176 semanage fcontext command. This will modify the SELinux labeling data‐
177 base. You will need to use restorecon to apply the labels.
178
181 semanage fcontext can also be used to manipulate default file context
182 mappings.
183 semanage permissive can also be used to manipulate whether or not a
185 process type is permissive.
186 semanage module can also be used to enable/disable/install/remove pol‐
188 icy modules.
189 semanage boolean can also be used to manipulate the booleans
191 system-config-selinux is a GUI tool available to customize SELinux pol‐
194 icy settings.
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198 This manual page was auto-generated using sepolicy manpage .
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202 selinux(8), thumb(8), semanage(8), restorecon(8), chcon(1), sepol‐
203 icy(8), setsebool(8)
204thumb 23-12-15 thumb_selinux(8)