1fwupd_selinux(8) SELinux Policy fwupd fwupd_selinux(8)
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6 fwupd_selinux - Security Enhanced Linux Policy for the fwupd processes
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9 Security-Enhanced Linux secures the fwupd processes via flexible manda‐
10 tory access control.
11 The fwupd processes execute with the fwupd_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 fwupd_t
19
23 The fwupd_t SELinux type can be entered via the fwupd_exec_t file type.
24 The default entrypoint paths for the fwupd_t domain are the following:
26 /usr/libexec/fwupd/fwupd
28
30 SELinux defines process types (domains) for each process running on the
31 system
32 You can see the context of a process using the -Z option to ps
34 Policy governs the access confined processes have to files. SELinux
36 fwupd policy is very flexible allowing users to setup their fwupd pro‐
37 cesses in as secure a method as possible.
38 The following process types are defined for fwupd:
40 fwupd_t
42 Note: semanage permissive -a fwupd_t can be used to make the process
44 type fwupd_t permissive. SELinux does not deny access to permissive
45 process types, but the AVC (SELinux denials) messages are still gener‐
46 ated.
47
50 SELinux policy is customizable based on least access required. fwupd
51 policy is extremely flexible and has several booleans that allow you to
52 manipulate the policy and run fwupd with the tightest access possible.
53 If you want to deny user domains applications to map a memory region as
57 both executable and writable, this is dangerous and the executable
58 should be reported in bugzilla, you must turn on the deny_execmem bool‐
59 ean. Enabled by default.
60 setsebool -P deny_execmem 1
62 If you want to control the ability to mmap a low area of the address
66 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
67 the mmap_low_allowed boolean. Disabled by default.
68 setsebool -P mmap_low_allowed 1
70 If you want to disable kernel module loading, you must turn on the se‐
74 cure_mode_insmod boolean. Enabled by default.
75 setsebool -P secure_mode_insmod 1
77 If you want to allow unconfined executables to make their heap memory
81 executable. Doing this is a really bad idea. Probably indicates a
82 badly coded executable, but could indicate an attack. This executable
83 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
84 echeap boolean. Disabled by default.
85 setsebool -P selinuxuser_execheap 1
87 If you want to allow unconfined executables to make their stack exe‐
91 cutable. This should never, ever be necessary. Probably indicates a
92 badly coded executable, but could indicate an attack. This executable
93 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
94 stack boolean. Enabled by default.
95 setsebool -P selinuxuser_execstack 1
97
101 The SELinux process type fwupd_t can manage files labeled with the fol‐
102 lowing file types. The paths listed are the default paths for these
103 file types. Note the processes UID still need to have DAC permissions.
104 file_type
106 all files on the system
108
111 SELinux requires files to have an extended attribute to define the file
112 type.
113 You can see the context of a file using the -Z option to ls
115 Policy governs the access confined processes have to these files.
117 SELinux fwupd policy is very flexible allowing users to setup their
118 fwupd processes in as secure a method as possible.
119 STANDARD FILE CONTEXT
121 SELinux defines the file context types for the fwupd, if you wanted to
123 store files with these types in a diffent paths, you need to execute
124 the semanage command to sepecify alternate labeling and then use re‐
125 storecon to put the labels on disk.
126 semanage fcontext -a -t fwupd_unit_file_t '/srv/myfwupd_content(/.*)?'
128 restorecon -R -v /srv/myfwupd_content
129 Note: SELinux often uses regular expressions to specify labels that
131 match multiple files.
132 The following file types are defined for fwupd:
134 fwupd_cache_t
138 - Set files with the fwupd_cache_t type, if you want to store the files
140 under the /var/cache directory.
141 Paths:
144 /var/cache/fwupd(/.*)?, /var/cache/app-info(/.*)?
145 fwupd_cert_t
148 - Set files with the fwupd_cert_t type, if you want to treat the files
150 as fwupd certificate data.
151 fwupd_exec_t
155 - Set files with the fwupd_exec_t type, if you want to transition an
157 executable to the fwupd_t domain.
158 fwupd_unit_file_t
162 - Set files with the fwupd_unit_file_t type, if you want to treat the
164 files as fwupd unit content.
165 Paths:
168 /usr/lib/systemd/system/fwupd.*, /usr/lib/systemd/system/fwupd-
169 offline-update.*
170 fwupd_var_lib_t
173 - Set files with the fwupd_var_lib_t type, if you want to store the
175 fwupd files under the /var/lib directory.
176 Note: File context can be temporarily modified with the chcon command.
180 If you want to permanently change the file context you need to use the
181 semanage fcontext command. This will modify the SELinux labeling data‐
182 base. You will need to use restorecon to apply the labels.
183
186 semanage fcontext can also be used to manipulate default file context
187 mappings.
188 semanage permissive can also be used to manipulate whether or not a
190 process type is permissive.
191 semanage module can also be used to enable/disable/install/remove pol‐
193 icy modules.
194 semanage boolean can also be used to manipulate the booleans
196 system-config-selinux is a GUI tool available to customize SELinux pol‐
199 icy settings.
200
203 This manual page was auto-generated using sepolicy manpage .
204
207 selinux(8), fwupd(8), semanage(8), restorecon(8), chcon(1), sepol‐
208 icy(8), setsebool(8)
209fwupd 21-06-09 fwupd_selinux(8)