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//===-- sanitizer_common_libcdep.cc ---------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
//===----------------------------------------------------------------------===//
#include "sanitizer_common.h"
#include "sanitizer_flags.h"
#include "sanitizer_stackdepot.h"
#include "sanitizer_stacktrace.h"
#include "sanitizer_symbolizer.h"
#if SANITIZER_POSIX
#include "sanitizer_posix.h"
#endif
namespace __sanitizer {
bool ReportFile::SupportsColors() {
SpinMutexLock l(mu);
ReopenIfNecessary();
return SupportsColoredOutput(fd);
}
bool ColorizeReports() {
// FIXME: Add proper Windows support to AnsiColorDecorator and re-enable color
// printing on Windows.
if (SANITIZER_WINDOWS)
return false;
const char *flag = common_flags()->color;
return internal_strcmp(flag, "always") == 0 ||
(internal_strcmp(flag, "auto") == 0 && report_file.SupportsColors());
}
static void (*sandboxing_callback)();
void SetSandboxingCallback(void (*f)()) {
sandboxing_callback = f;
}
void ReportErrorSummary(const char *error_type, StackTrace *stack) {
#if !SANITIZER_GO
if (!common_flags()->print_summary)
return;
if (stack->size == 0) {
ReportErrorSummary(error_type);
return;
}
// Currently, we include the first stack frame into the report summary.
// Maybe sometimes we need to choose another frame (e.g. skip memcpy/etc).
uptr pc = StackTrace::GetPreviousInstructionPc(stack->trace[0]);
SymbolizedStack *frame = Symbolizer::GetOrInit()->SymbolizePC(pc);
ReportErrorSummary(error_type, frame->info);
frame->ClearAll();
#endif
}
static void (*SoftRssLimitExceededCallback)(bool exceeded);
void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded)) {
CHECK_EQ(SoftRssLimitExceededCallback, nullptr);
SoftRssLimitExceededCallback = Callback;
}
void BackgroundThread(void *arg) {
uptr hard_rss_limit_mb = common_flags()->hard_rss_limit_mb;
uptr soft_rss_limit_mb = common_flags()->soft_rss_limit_mb;
uptr prev_reported_rss = 0;
uptr prev_reported_stack_depot_size = 0;
bool reached_soft_rss_limit = false;
while (true) {
SleepForMillis(100);
uptr current_rss_mb = GetRSS() >> 20;
if (Verbosity()) {
// If RSS has grown 10% since last time, print some information.
if (prev_reported_rss * 11 / 10 < current_rss_mb) {
Printf("%s: RSS: %zdMb\n", SanitizerToolName, current_rss_mb);
prev_reported_rss = current_rss_mb;
}
// If stack depot has grown 10% since last time, print it too.
StackDepotStats *stack_depot_stats = StackDepotGetStats();
if (prev_reported_stack_depot_size * 11 / 10 <
stack_depot_stats->allocated) {
Printf("%s: StackDepot: %zd ids; %zdM allocated\n",
SanitizerToolName,
stack_depot_stats->n_uniq_ids,
stack_depot_stats->allocated >> 20);
prev_reported_stack_depot_size = stack_depot_stats->allocated;
}
}
// Check RSS against the limit.
if (hard_rss_limit_mb && hard_rss_limit_mb < current_rss_mb) {
Report("%s: hard rss limit exhausted (%zdMb vs %zdMb)\n",
SanitizerToolName, hard_rss_limit_mb, current_rss_mb);
DumpProcessMap();
Die();
}
if (soft_rss_limit_mb) {
if (soft_rss_limit_mb < current_rss_mb && !reached_soft_rss_limit) {
reached_soft_rss_limit = true;
Report("%s: soft rss limit exhausted (%zdMb vs %zdMb)\n",
SanitizerToolName, soft_rss_limit_mb, current_rss_mb);
if (SoftRssLimitExceededCallback)
SoftRssLimitExceededCallback(true);
} else if (soft_rss_limit_mb >= current_rss_mb &&
reached_soft_rss_limit) {
reached_soft_rss_limit = false;
if (SoftRssLimitExceededCallback)
SoftRssLimitExceededCallback(false);
}
}
}
}
void WriteToSyslog(const char *msg) {
InternalScopedString msg_copy(kErrorMessageBufferSize);
msg_copy.append("%s", msg);
char *p = msg_copy.data();
char *q;
// Print one line at a time.
// syslog, at least on Android, has an implicit message length limit.
do {
q = internal_strchr(p, '\n');
if (q)
*q = '\0';
WriteOneLineToSyslog(p);
if (q)
p = q + 1;
} while (q);
}
void MaybeStartBackgroudThread() {
#if SANITIZER_LINUX && \
!SANITIZER_GO // Need to implement/test on other platforms.
// Start the background thread if one of the rss limits is given.
if (!common_flags()->hard_rss_limit_mb &&
!common_flags()->soft_rss_limit_mb) return;
if (!&real_pthread_create) return; // Can't spawn the thread anyway.
internal_start_thread(BackgroundThread, nullptr);
#endif
}
} // namespace __sanitizer
void NOINLINE
__sanitizer_sandbox_on_notify(__sanitizer_sandbox_arguments *args) {
PrepareForSandboxing(args);
if (sandboxing_callback)
sandboxing_callback();
}
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