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//===-- sanitizer_common_libcdep.cc ---------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file is shared between AddressSanitizer and ThreadSanitizer
// run-time libraries.
//===----------------------------------------------------------------------===//
#include "sanitizer_allocator_interface.h"
#include "sanitizer_common.h"
#include "sanitizer_flags.h"
#include "sanitizer_procmaps.h"
namespace __sanitizer {
static void (*SoftRssLimitExceededCallback)(bool exceeded);
void SetSoftRssLimitExceededCallback(void (*Callback)(bool exceeded)) {
CHECK_EQ(SoftRssLimitExceededCallback, nullptr);
SoftRssLimitExceededCallback = Callback;
}
#if (SANITIZER_LINUX || SANITIZER_NETBSD) && !SANITIZER_GO
// Weak default implementation for when sanitizer_stackdepot is not linked in.
SANITIZER_WEAK_ATTRIBUTE StackDepotStats *StackDepotGetStats() {
return nullptr;
}
void BackgroundThread(void *arg) {
const uptr hard_rss_limit_mb = common_flags()->hard_rss_limit_mb;
const uptr soft_rss_limit_mb = common_flags()->soft_rss_limit_mb;
const bool heap_profile = common_flags()->heap_profile;
uptr prev_reported_rss = 0;
uptr prev_reported_stack_depot_size = 0;
bool reached_soft_rss_limit = false;
uptr rss_during_last_reported_profile = 0;
while (true) {
SleepForMillis(100);
const 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 (stack_depot_stats) {
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);
}
}
if (heap_profile &&
current_rss_mb > rss_during_last_reported_profile * 1.1) {
Printf("\n\nHEAP PROFILE at RSS %zdMb\n", current_rss_mb);
__sanitizer_print_memory_profile(90, 20);
rss_during_last_reported_profile = current_rss_mb;
}
}
}
#endif
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.
while ((q = internal_strchr(p, '\n'))) {
*q = '\0';
WriteOneLineToSyslog(p);
p = q + 1;
}
// Print remaining characters, if there are any.
// Note that this will add an extra newline at the end.
// FIXME: buffer extra output. This would need a thread-local buffer, which
// on Android requires plugging into the tools (ex. ASan's) Thread class.
if (*p)
WriteOneLineToSyslog(p);
}
void MaybeStartBackgroudThread() {
#if (SANITIZER_LINUX || SANITIZER_NETBSD) && \
!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 &&
!common_flags()->heap_profile) return;
if (!&real_pthread_create) return; // Can't spawn the thread anyway.
internal_start_thread(BackgroundThread, nullptr);
#endif
}
static void (*sandboxing_callback)();
void SetSandboxingCallback(void (*f)()) {
sandboxing_callback = f;
}
} // namespace __sanitizer
SANITIZER_INTERFACE_WEAK_DEF(void, __sanitizer_sandbox_on_notify,
__sanitizer_sandbox_arguments *args) {
__sanitizer::PlatformPrepareForSandboxing(args);
if (__sanitizer::sandboxing_callback)
__sanitizer::sandboxing_callback();
}
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