configs for jailed procs to dump code coverage data

list system calls used for dumping code coverage information; empty on
non code coverage builds. Mini-jail configurations can include this file
instead of trying to manage the list themselves.

Bug: 139313557
Test: arm32/arm64/x86 media svcs w/native coverage on, kill -37 to dump stats.
Change-Id: I7323a9739803756a76f54e4a98e995522cab71ef

code_coverage/Android.mk

@@ -0,0 +1,37 @@
+# policies to allow processes inside minijail to dump code coverage information
+#
+
+LOCAL_PATH := $(call my-dir)
+
+
+include $(CLEAR_VARS)
+LOCAL_MODULE := code_coverage.policy
+LOCAL_MODULE_CLASS := ETC
+LOCAL_MULTILIB := both
+
+ifeq ($(TARGET_ARCH), $(filter $(TARGET_ARCH), arm arm64))
+LOCAL_MODULE_STEM_32 := code_coverage.arm.policy
+LOCAL_MODULE_STEM_64 := code_coverage.arm64.policy
+endif
+
+ifeq ($(TARGET_ARCH), $(filter $(TARGET_ARCH), x86 x86_64))
+LOCAL_MODULE_STEM_32 := code_coverage.x86.policy
+LOCAL_MODULE_STEM_64 := code_coverage.x86_64.policy
+endif
+
+# different files for different configurations
+ifeq ($(NATIVE_COVERAGE),true)
+LOCAL_SRC_FILES_arm := seccomp_policy/code_coverage.arm.policy
+LOCAL_SRC_FILES_arm64 := seccomp_policy/code_coverage.arm64.policy
+LOCAL_SRC_FILES_x86 := seccomp_policy/code_coverage.x86.policy
+LOCAL_SRC_FILES_x86_64 := seccomp_policy/code_coverage.x86_64.policy
+else
+LOCAL_SRC_FILES_arm := empty_policy/code_coverage.arm.policy
+LOCAL_SRC_FILES_arm64 := empty_policy/code_coverage.arm64.policy
+LOCAL_SRC_FILES_x86 := empty_policy/code_coverage.x86.policy
+LOCAL_SRC_FILES_x86_64 := empty_policy/code_coverage.x86_64.policy
+endif
+
+LOCAL_MODULE_TARGET_ARCH := arm arm64 x86 x86_64
+LOCAL_MODULE_PATH := $(TARGET_OUT)/etc/seccomp_policy
+include $(BUILD_PREBUILT)

code_coverage/empty_policy/code_coverage.arm.policy

@@ -0,0 +1,2 @@
+# empty unless code_coverage is enabled.
+# code_coverage.arm.policy

code_coverage/empty_policy/code_coverage.arm64.policy

@@ -0,0 +1,2 @@
+# empty unless code_coverage is enabled.
+# code_coverage.arm64.policy

code_coverage/empty_policy/code_coverage.x86.policy

@@ -0,0 +1,2 @@
+# empty unless code_coverage is enabled.
+# code_coverage.x86.policy

code_coverage/empty_policy/code_coverage.x86_64.policy

@@ -0,0 +1,2 @@
+# empty unless code_coverage is enabled.
+# code_coverage.x86_64.policy

code_coverage/seccomp_policy/code_coverage.arm.policy

@@ -0,0 +1,14 @@
+close: 1
+mkdirat: 1
+msync: 1
+munmap: 1
+openat: 1
+write: 1
+fcntl64: 1
+fstat64: 1
+geteuid32: 1
+_llseek: 1
+mmap2: 1
+sigreturn: 1
+gettimeofday: 1
+prctl: 1

code_coverage/seccomp_policy/code_coverage.arm64.policy

@@ -0,0 +1,13 @@
+close: 1
+mkdirat: 1
+msync: 1
+munmap: 1
+openat: 1
+write: 1
+fcntl: 1
+fstat: 1
+geteuid: 1
+lseek: 1
+mmap: 1
+rt_sigreturn: 1
+prctl: 1

code_coverage/seccomp_policy/code_coverage.policy.def

@@ -0,0 +1,51 @@
+// SECCOMP_MODE_STRICT
+//
+// minijail allowances for code coverage
+// this is processed with generate.sh, so we can use appropriate directives
+// size specific: __LP64__ for 64 bit, else 32 bit
+// arch specific: __arm__, __aarch64__, __i386__, __x86_64__
+
+// includes *all* syscalls used during the coverage dumping
+// no skipping just because they might have been in another policy file.
+
+// coverage tool uses different operations on different passes
+// 1st: uses write() to fill the file
+// 2nd-Nth: uses mmap() to update in place
+
+close: 1
+mkdirat: 1
+msync: 1
+munmap: 1
+openat: 1
+write: 1
+
+#if     defined(__LP64__)
+fcntl: 1
+fstat: 1
+geteuid: 1
+lseek: 1
+mmap: 1
+rt_sigreturn: 1
+#else
+fcntl64: 1
+fstat64: 1
+geteuid32: 1
+_llseek: 1
+mmap2: 1
+sigreturn: 1
+#endif
+
+#if     defined(__arm__)
+gettimeofday: 1
+#endif
+
+#if     defined(__i386__)
+madvise: 1
+#endif
+
+#if     defined(__arm__)
+prctl: 1
+#elif   defined(__aarch64__)
+prctl: 1
+#endif
+

code_coverage/seccomp_policy/code_coverage.x86.policy

@@ -0,0 +1,13 @@
+close: 1
+mkdirat: 1
+msync: 1
+munmap: 1
+openat: 1
+write: 1
+fcntl64: 1
+fstat64: 1
+geteuid32: 1
+_llseek: 1
+mmap2: 1
+sigreturn: 1
+madvise: 1

code_coverage/seccomp_policy/code_coverage.x86_64.policy

@@ -0,0 +1,12 @@
+close: 1
+mkdirat: 1
+msync: 1
+munmap: 1
+openat: 1
+write: 1
+fcntl: 1
+fstat: 1
+geteuid: 1
+lseek: 1
+mmap: 1
+rt_sigreturn: 1

code_coverage/seccomp_policy/generate.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# generate the arch-specific files from the generic one
+
+set -ex
+
+cd "$(dirname "$0")"
+CPP='cpp -undef -E -P code_coverage.policy.def'
+$CPP -D__arm__ -o code_coverage.arm.policy
+$CPP -D__aarch64__ -D__LP64__ -o code_coverage.arm64.policy
+$CPP -D__i386__ -o code_coverage.x86.policy
+$CPP -D__x86_64__ -D__LP64__ -o code_coverage.x86_64.policy