Thank you for your notification. The information is very helpful. 2015-03-31 8:57 GMT+09:00 Nick Kralevich <[email protected]>:
> Just spent some time debugging a problem that I thought I'd share with > the wider SEAndroid community. Hopefully someone won't experience the > same problem in the future. > > Problem: Device boots slowly. The bulk of the boot time is in > ueventd's function fixup_sys_perms, which calls restorecon_recursive > on nodes in /sys. Code which performed this operation was added in > https://android-review.googlesource.com/100249 . > > Device contains the following entry in /file_contexts: > > /sys/devices/.*asdf.*(/.*)? u:object_r:sysfs_asdf:s0 > > While doing the directory tree walk, restorecon_recursive() is > optimized to avoid recursing down paths which will never match a > regular expression in /file_contexts. This is an important > optimization which keeps boot times down. > > However, the file_contexts entry above defeats the optimization. It > tries looking for any file/directory named "asdf" in any subdirectory > of /sys/devices, which requires recursing into every directory of > /sys/devices > > Changing the regex to: > > /sys/devices/[^/]+asdf[^/]+(/.*)? u:object_r:sysfs_asdf:s0 > > substantially improved boot times, as it allowed the > restorecon_recursive optimizations to be effective and avoids visiting > unnecessary directories. > > -- > Nick Kralevich | Android Security | [email protected] | 650.214.4037 > _______________________________________________ > Seandroid-list mailing list > [email protected] > To unsubscribe, send email to [email protected]. > To get help, send an email containing "help" to > [email protected]. >
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