[GWP-ASan] Provide runtime configuration through an env var + sysprop.
This patch introduces GWP-ASan system properties and environment
variables to control the internal sampling rates of GWP-ASan. This can
be used for:
1. "Torture testing" the system, i.e. running it under an extremely
high sampling rate under GWP-ASan.
2. Increasing sampling remotely to allow further crash report
collection of rare issues.
There are three sets of system properites:
1. libc.debug.gwp_asan.*.system_default: Default values for native
executables and system apps.
2. libc.debug.gwp_asan.*.app_default: Default values for non-system
apps, and
3. libc.debug.gwp_asan.*.<basename/app_name>: Default values for an
individual app or native process.
There are three variables that can be changed:
1. The allocation sampling rate (default: 2500) - using the environment
variable GWP_ASAN_SAMPLE_RATE or the libc.debug.gwp_asan.sample_rate.*
system property.
2. The process sampling rate (default: 128 for system apps/processes, 1
for opted-in apps) - using the environment variable
GWP_ASAN_PROCESS_SAMPLING or the libc.debug.gwp_asan.process_sampling.*
system property,
3. The number of slots available (default: 32) - using the environment
variable GWP_ASAN_MAX_ALLOCS or the libc.debug.gwp_asan.max_allocs.*
system property.
If not specified, #3 will be calculated as a ratio of the default
|2500 SampleRate : 32 slots|. So, a sample rate of "1250" (i.e. twice as
frequent sampling) will result in a doubling of the max_allocs to "64".
Bug: 219651032
Test: atest bionic-unit-tests
Change-Id: Idb40a2a4d074e01ce3c4e635ad639a91a32d570f
diff --git a/tests/Android.bp b/tests/Android.bp
index 3061142..ee49e65 100644
--- a/tests/Android.bp
+++ b/tests/Android.bp
@@ -62,7 +62,10 @@
// For glibc.
"-D__STDC_LIMIT_MACROS",
],
- header_libs: ["libcutils_headers"],
+ header_libs: [
+ "libcutils_headers",
+ "gwp_asan_headers"
+ ],
// Ensure that the tests exercise shadow call stack support and
// the hint space PAC/BTI instructions.
arch: {
@@ -571,6 +574,18 @@
],
}
+cc_test_library {
+ name: "libBionicGwpAsanTests",
+ defaults: ["bionic_tests_defaults"],
+ srcs: [
+ "gwp_asan_test.cpp",
+ ],
+ include_dirs: [
+ "bionic/libc",
+ ],
+ static_libs: ["libbase"],
+}
+
// -----------------------------------------------------------------------------
// Fortify tests.
// -----------------------------------------------------------------------------
@@ -735,6 +750,7 @@
"libBionicStandardTests",
"libBionicElfTlsTests",
"libBionicFramePointerTests",
+ "libBionicGwpAsanTests",
"libfortify1-tests-clang",
"libfortify1-new-tests-clang",
"libfortify2-tests-clang",