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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
This commit is contained in:
Primiano Tucci 2020-10-09 13:59:41 +01:00
parent 1ef094a890
commit 253289fe07
1 changed files with 8 additions and 0 deletions
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8
rootdir/init.rc
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@ -1041,6 +1041,14 @@ on property:security.perf_harden=1
write /proc/sys/kernel/perf_cpu_time_max_percent 25
write /proc/sys/kernel/perf_event_mlock_kb 516
# This property can be set only on userdebug/eng. See neverallow rule in
# /system/sepolicy/private/property.te .
on property:security.lower_kptr_restrict=1
write /proc/sys/kernel/kptr_restrict 0
on property:security.lower_kptr_restrict=0
write /proc/sys/kernel/kptr_restrict 2
# on shutdown
# In device's init.rc, this trigger can be used to do device-specific actions