In general, it appears that libselinux and libsepol interpret paths and
contexts as bytes. For instance, selabel_file(5) mentions about the path
field of file_contexts:
Strings representing paths are processed as bytes (as opposed to
Unicode), meaning that non-ASCII characters are not matched
by a single wildcard.
libsepol also uses primitives such as strchr[1], which explicitly
operate at the byte level (see strchr(3)). However, practically, Android
paths and contexts all uses ASCII characters.
Use the str type (i.e., Unicode) for all Python code to avoid a larger
refactoring. Ensure we convert to bytes for inputs and outputs of
libsepolwrap.so. The encoding "ascii" is used, which will raise an error
should a context or type contain non-ASCII characters.
Update headers to match development/docs/copyright-templates.
[1] https://cs.android.com/android/platform/superproject/+/master:external/selinux/libsepol/src/context_record.c;l=224;drc=454466e2e49fd99f36db78396e604962b8682cb4
Bug: 200119288
Test: lunch aosp_bramble-userdebug && m
Test: atest --host fc_sort_test
Test: manually run searchpolicy
Change-Id: I72d41a35f90b2d4112e481cd8d7408764a6c8132
New maintenance scheme for mapping files:
Say, V is the current SELinux platform version, then at any point in time we
only maintain (V->V-1) mapping. (V->V-n) map is constructed from top (V->V-n+1)
and bottom (V-n+1->V-n) without changes to previously maintained mapping files.
Caveats:
- 26.0.cil doesn't technically represent 27.0->26.0 map, but rather
current->26.0. We'll fully migrate to the scheme with future releases.
Bug: 67510052
Test: adding new public type only requires changing the latest compat map
Change-Id: Iab5564e887ef2c8004cb493505dd56c6220c61f8
Private types are not visible to vendor/odm policy, so we don't need mapping
entries for them.
We build platform-only public policy .cil file and give it as input to
treble_sepolicy_tests. Using this public policy the test can now figure out if
the newly added type in public or private.
Bug: 116344577
Test: adding public type triggers mapping test failure, adding private type does
not.
Change-Id: I421f335e37274b24aa73109e260653d7b73788b5
treble_sepolicy_tests emit during build time warnings for
expandtypeattribute statements in the mapping file.
Silence those warning.
Bug: 72757373
Test: build sepolicy
Change-Id: Ia40d80d8172c96c75854d2e1ec0d284ea0724b5c
