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commit: 60d89770b45fce6ae0eefabbbbebd1fbaa717eea |
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Author: David Sugar <dsugar <AT> tresys <DOT> com> |
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AuthorDate: Fri Dec 8 22:30:58 2017 +0000 |
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Commit: Jason Zaman <perfinion <AT> gentoo <DOT> org> |
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CommitDate: Tue Dec 12 07:06:27 2017 +0000 |
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URL: https://gitweb.gentoo.org/proj/hardened-refpolicy.git/commit/?id=60d89770 |
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label systemd-shutdown so shutdown works |
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I am seeing (on RHEL 7.4 w/systemd) that halting the system doesn't work. It took me a long time (and a lot of help from Steve L.) to figure out what was going on. It turns out in refpolicy the default label for /usr/lib/systemd/systemd-shutdown is bin_t. But when systemd tried to execve systemd-shutdown it fails because init_t isn't allowed file entrypoint for bin_t. When I labeled systemd-shutdown as init_exec_t shutting down the system works. |
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I was seeing the following log (from systemd) when I enabled systemd debug logging (which was very useful). |
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[ 59.745037] systemd[1]: Starting Final Step. |
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[ 59.746112] systemd[1]: Starting Power-Off... |
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[ 59.776320] systemd[1]: Shutting down. |
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[ 59.783559] systemd[1]: Failed to execute shutdown binary, freezing: Operation not permitted |
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At this point everything locks up instead of actually halting the system. |
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This is a patch to change the label for systemd-shutdown which solves the problem. I'm happy to go through and make a distinct type of systemd-shutdown if someone doesn't think it is a good idea to share the type with systemd. But based on what is going on, this might be reasonable. |
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Signed-off-by: Dave Sugar <dsugar <AT> tresys.com> |
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policy/modules/system/init.fc | 1 + |
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1 file changed, 1 insertion(+) |
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diff --git a/policy/modules/system/init.fc b/policy/modules/system/init.fc |
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index d029ea30..bf0acaf9 100644 |
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--- a/policy/modules/system/init.fc |
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+++ b/policy/modules/system/init.fc |
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@@ -29,6 +29,7 @@ ifdef(`distro_gentoo',` |
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/usr/bin/upstart -- gen_context(system_u:object_r:init_exec_t,s0) |
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/usr/lib/systemd/systemd -- gen_context(system_u:object_r:init_exec_t,s0) |
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+/usr/lib/systemd/systemd-shutdown -- gen_context(system_u:object_r:init_exec_t,s0) |
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/usr/lib/systemd/system-preset(/.*)? gen_context(system_u:object_r:systemd_unit_t,s0) |
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/usr/lib/systemd/user-preset(/.*)? gen_context(system_u:object_r:systemd_unit_t,s0) |
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/usr/lib/systemd/ntp-units\.d -d gen_context(system_u:object_r:systemd_unit_t,s0) |
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