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[Sanitizer] checks ASLR on FreeBSD

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- Especially MemorySanitizer fails if those sysctl configs are enabled.

Reviewers: vitalybuka, emaste, dim

Reviewed By: dim

Differential Revision: https://reviews.llvm.org/D66582

llvm-svn: 369708
This commit is contained in:
David Carlier 2019-08-22 21:36:35 +00:00
parent 64adf7b6ae
commit e2ed800d62
3 changed files with 29 additions and 2 deletions
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2
compiler-rt/lib/asan/asan_rtl.cpp
View File

@ -402,7 +402,6 @@ static void AsanInitInternal() {
asan_init_is_running = true;
CacheBinaryName();
CheckASLR();
// Initialize flags. This must be done early, because most of the
// initialization steps look at flags().
@ -450,6 +449,7 @@ static void AsanInitInternal() {
SetLowLevelAllocateCallback(OnLowLevelAllocate);
InitializeAsanInterceptors();
CheckASLR();
// Enable system log ("adb logcat") on Android.
// Doing this before interceptors are initialized crashes in:

2
compiler-rt/lib/msan/msan.cpp
View File

@ -403,7 +403,6 @@ void __msan_init() {
AvoidCVE_2016_2143();
CacheBinaryName();
CheckASLR();
InitializeFlags();
// Install tool-specific callbacks in sanitizer_common.
@ -412,6 +411,7 @@ void __msan_init() {
__sanitizer_set_report_path(common_flags()->log_path);
InitializeInterceptors();
CheckASLR();
InitTlsSize();
InstallDeadlySignalHandlers(MsanOnDeadlySignal);
InstallAtExitHandler(); // Needs __cxa_atexit interceptor.

27
compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
View File

@ -2011,6 +2011,33 @@ void CheckASLR() {
CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1);
ReExec();
}
#elif SANITIZER_FREEBSD
int aslr_pie;
uptr len = sizeof(aslr_pie);
#if SANITIZER_WORDSIZE == 64
if (UNLIKELY(internal_sysctlbyname("kern.elf64.aslr.pie_enable",
&aslr_pie, &len, NULL, 0) == -1)) {
// We're making things less 'dramatic' here since
// the OID is not necessarily guaranteed to be here
// just yet regarding FreeBSD release
return;
}
if (aslr_pie > 0) {
Printf("This sanitizer is not compatible with enabled ASLR and binaries compiled with PIE\n");
Die();
}
#endif
// there might be 32 bits compat for 64 bits
if (UNLIKELY(internal_sysctlbyname("kern.elf32.aslr.pie_enable",
&aslr_pie, &len, NULL, 0) == -1)) {
return;
}
if (aslr_pie > 0) {
Printf("This sanitizer is not compatible with enabled ASLR and binaries compiled with PIE\n");
Die();
}
#else
// Do nothing
#endif