1fwupd_selinux(8) SELinux Policy fwupd fwupd_selinux(8)
2
6 fwupd_selinux - Security Enhanced Linux Policy for the fwupd processes
7
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, /usr/libexec/fwupd/fwupdoffline,
28 /usr/libexec/fwupd/fwupd-detect-cet
29
31 SELinux defines process types (domains) for each process running on the
32 system
33 You can see the context of a process using the -Z option to ps
35 Policy governs the access confined processes have to files. SELinux
37 fwupd policy is very flexible allowing users to setup their fwupd pro‐
38 cesses in as secure a method as possible.
39 The following process types are defined for fwupd:
41 fwupd_t
43 Note: semanage permissive -a fwupd_t can be used to make the process
45 type fwupd_t permissive. SELinux does not deny access to permissive
46 process types, but the AVC (SELinux denials) messages are still gener‐
47 ated.
48
51 SELinux policy is customizable based on least access required. fwupd
52 policy is extremely flexible and has several booleans that allow you to
53 manipulate the policy and run fwupd with the tightest access possible.
54 If you want to dontaudit all daemons scheduling requests (setsched,
58 sys_nice), you must turn on the daemons_dontaudit_scheduling boolean.
59 Enabled by default.
60 setsebool -P daemons_dontaudit_scheduling 1
62 If you want to deny user domains applications to map a memory region as
66 both executable and writable, this is dangerous and the executable
67 should be reported in bugzilla, you must turn on the deny_execmem bool‐
68 ean. Disabled by default.
69 setsebool -P deny_execmem 1
71 If you want to control the ability to mmap a low area of the address
75 space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on
76 the mmap_low_allowed boolean. Disabled by default.
77 setsebool -P mmap_low_allowed 1
79 If you want to disable kernel module loading, you must turn on the se‐
83 cure_mode_insmod boolean. Disabled by default.
84 setsebool -P secure_mode_insmod 1
86 If you want to allow unconfined executables to make their heap memory
90 executable. Doing this is a really bad idea. Probably indicates a
91 badly coded executable, but could indicate an attack. This executable
92 should be reported in bugzilla, you must turn on the selinuxuser_ex‐
93 echeap boolean. Disabled by default.
94 setsebool -P selinuxuser_execheap 1
96 If you want to allow unconfined executables to make their stack exe‐
100 cutable. This should never, ever be necessary. Probably indicates a
101 badly coded executable, but could indicate an attack. This executable
102 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
103 stack boolean. Enabled by default.
104 setsebool -P selinuxuser_execstack 1
106
110 The SELinux process type fwupd_t can manage files labeled with the fol‐
111 lowing file types. The paths listed are the default paths for these
112 file types. Note the processes UID still need to have DAC permissions.
113 file_type
115 all files on the system
117
120 SELinux requires files to have an extended attribute to define the file
121 type.
122 You can see the context of a file using the -Z option to ls
124 Policy governs the access confined processes have to these files.
126 SELinux fwupd policy is very flexible allowing users to setup their
127 fwupd processes in as secure a method as possible.
128 STANDARD FILE CONTEXT
130 SELinux defines the file context types for the fwupd, if you wanted to
132 store files with these types in a different paths, you need to execute
133 the semanage command to specify alternate labeling and then use re‐
134 storecon to put the labels on disk.
135 semanage fcontext -a -t fwupd_exec_t '/srv/fwupd/content(/.*)?'
137 restorecon -R -v /srv/myfwupd_content
138 Note: SELinux often uses regular expressions to specify labels that
140 match multiple files.
141 The following file types are defined for fwupd:
143 fwupd_cache_t
147 - Set files with the fwupd_cache_t type, if you want to store the files
149 under the /var/cache directory.
150 Paths:
153 /var/cache/fwupd(/.*)?, /var/cache/app-info(/.*)?
154 fwupd_cert_t
157 - Set files with the fwupd_cert_t type, if you want to treat the files
159 as fwupd certificate data.
160 fwupd_exec_t
164 - Set files with the fwupd_exec_t type, if you want to transition an
166 executable to the fwupd_t domain.
167 Paths:
170 /usr/libexec/fwupd/fwupd, /usr/libexec/fwupd/fwupdoffline,
171 /usr/libexec/fwupd/fwupd-detect-cet
172 fwupd_unit_file_t
175 - Set files with the fwupd_unit_file_t type, if you want to treat the
177 files as fwupd unit content.
178 fwupd_var_lib_t
182 - Set files with the fwupd_var_lib_t type, if you want to store the
184 fwupd files under the /var/lib directory.
185 Note: File context can be temporarily modified with the chcon command.
189 If you want to permanently change the file context you need to use the
190 semanage fcontext command. This will modify the SELinux labeling data‐
191 base. You will need to use restorecon to apply the labels.
192
195 semanage fcontext can also be used to manipulate default file context
196 mappings.
197 semanage permissive can also be used to manipulate whether or not a
199 process type is permissive.
200 semanage module can also be used to enable/disable/install/remove pol‐
202 icy modules.
203 semanage boolean can also be used to manipulate the booleans
205 system-config-selinux is a GUI tool available to customize SELinux pol‐
208 icy settings.
209
212 This manual page was auto-generated using sepolicy manpage .
213
216 selinux(8), fwupd(8), semanage(8), restorecon(8), chcon(1), sepol‐
217 icy(8), setsebool(8)
218fwupd 23-12-15 fwupd_selinux(8)