d88acc95ab
restorecon_recursive updates the SELinux label of the files in the
filesystem, and then attempts to write the xattr "security.sehash" as an
optimization for future restorecons. Writing security.* extended
attributes requires CAP_SYS_ADMIN, which system_server doesn't have (and
shouldn't have).
Suppress the computation and writing of the hash value. It's not
needed.
This bug has been around for a long time, but due to the fix for
bug 62302954, the error message is being generated more frequently
now.
TODO: It would be better if the default for restorecon was to suppress
the hash computation, since otherwise it encourages programs to be
overprivileged with CAP_SYS_ADMIN. I'll plan on doing that in a followup
commit.
Bugs where this error message has been called out:
Bug: 129766333
Bug: 129271240
Bug: 128700692
Bug: 129925723
Test: install an APK and ensure that no "SELinux: setxattr failed"
error messages are generated.
(cherry picked from commit cb1dddad27)
Change-Id: Ifc5be24d14029cb616d5564366fc10a0b93c9939