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[asan] Add a note to shadow memory setup error. 

Point to https://github.com/google/sanitizers/issues/856 as a possible cause of the failed mapping.

llvm-svn: 312687
This commit is contained in:
Evgeniy Stepanov 2017-09-07 01:35:59 +00:00
parent 4899a923db
commit 7d1ab555ae
1 changed files with 10 additions and 0 deletions
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10
compiler-rt/lib/asan/asan_shadow_setup.cc
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@ -81,6 +81,15 @@ static void ProtectGap(uptr addr, uptr size) {
Die();
}
static void MaybeReportLinuxPIEBug() {
#if SANITIZER_LINUX && (defined(__x86_64__) || defined(__aarch64__))
Report("This might be related to ELF_ET_DYN_BASE change in Linux 4.12.\n");
Report(
"See https://github.com/google/sanitizers/issues/837 for possible "
"workarounds.\n");
#endif
}
void InitializeShadowMemory() {
// Set the shadow memory address to uninitialized.
__asan_shadow_memory_dynamic_address = kDefaultShadowSentinel;
@ -141,6 +150,7 @@ void InitializeShadowMemory() {
"ASan cannot proceed correctly. ABORTING.\n");
Report("ASan shadow was supposed to be located in the [%p-%p] range.\n",
shadow_start, kHighShadowEnd);
MaybeReportLinuxPIEBug();
DumpProcessMap();
Die();
}