From b185ac061645654f330543e6053dab2d77191747 Mon Sep 17 00:00:00 2001 From: Hang Lu Date: Wed, 24 Mar 2021 13:17:22 +0800 Subject: libbinder: support BR_ONEWAY_SPAM_SUSPECT This command tells userspace to dump current stack, which happened when oneway spamming is detected in kernel. And also add an ioctl command BINDER_ENABLE_ONEWAY_SPAM_DETECTION to enable/disable this feature per-proc. Bug: 181190340 Change-Id: I7afb1df46a4fbf59bc69b56649aa3ee779dfea5a --- libs/binder/ProcessState.cpp | 15 +++++++++++++++ 1 file changed, 15 insertions(+) (limited to 'libs/binder/ProcessState.cpp') diff --git a/libs/binder/ProcessState.cpp b/libs/binder/ProcessState.cpp index a8b2fb2ff8..ca99042342 100644 --- a/libs/binder/ProcessState.cpp +++ b/libs/binder/ProcessState.cpp @@ -43,6 +43,7 @@ #define BINDER_VM_SIZE ((1 * 1024 * 1024) - sysconf(_SC_PAGE_SIZE) * 2) #define DEFAULT_MAX_BINDER_THREADS 15 +#define DEFAULT_ENABLE_ONEWAY_SPAM_DETECTION 1 #ifdef __ANDROID_VNDK__ const char* kDefaultDriver = "/dev/vndbinder"; @@ -358,6 +359,15 @@ status_t ProcessState::setThreadPoolMaxThreadCount(size_t maxThreads) { return result; } +status_t ProcessState::enableOnewaySpamDetection(bool enable) { + uint32_t enableDetection = enable ? 1 : 0; + if (ioctl(mDriverFD, BINDER_ENABLE_ONEWAY_SPAM_DETECTION, &enableDetection) == -1) { + ALOGE("Binder ioctl to enable oneway spam detection failed: %s", strerror(errno)); + return -errno; + } + return NO_ERROR; +} + void ProcessState::giveThreadPoolName() { androidSetThreadName( makeBinderThreadName().string() ); } @@ -388,6 +398,11 @@ static int open_driver(const char *driver) if (result == -1) { ALOGE("Binder ioctl to set max threads failed: %s", strerror(errno)); } + uint32_t enable = DEFAULT_ENABLE_ONEWAY_SPAM_DETECTION; + result = ioctl(fd, BINDER_ENABLE_ONEWAY_SPAM_DETECTION, &enable); + if (result == -1) { + ALOGE("Binder ioctl to enable oneway spam detection failed: %s", strerror(errno)); + } } else { ALOGW("Opening '%s' failed: %s\n", driver, strerror(errno)); } -- cgit v1.2.3-59-g8ed1b