tree dbbdcdfcf0e0ae6f386bce786b341ca372318875
parent 1ef094a89030ecb6acac551e1c6c77dde89eb63a
author Primiano Tucci <primiano@google.com> 1602248381 +0100
committer Primiano Tucci <primiano@google.com> 1603379921 +0100

Introduce security.lower_kptr_restrict property

This is to allow the tracing service to temporarily
lower kptr_restrict for the time it takes to build
its internal symbolization map (~200ms), only on
userdebug/eng builds.
kptr_restrict unfortunately cannot be lowered by
the tracing service itself. The main reason for that
is the fact that the kernel enforces a CAP_SYS_ADMIN
capability check at write() time, so the usual pattern
of opening the file in init and passing the FD to the
service won't work.

For more details see the design doc go/perfetto-kallsyms.
Bug: 136133013
Test: perfetto_integrationtests --gtest_filter=PerfettoTest.KernelAddressSymbolization in r.android.com/1454882

Change-Id: Ib2a8c69ed5348cc436223ff5e3eb8fd8df4ab860