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[tsan] Disable randomized address space on aarch64 linux. 

Summary:
After patch https://lkml.org/lkml/2015/12/21/340 is introduced in
linux kernel, the random gap between stack and heap is increased
from 128M to 36G on 39-bit aarch64. And it is almost impossible
to cover this big range. So we need to disable randomized virtual
space on aarch64 linux.

Reviewers: llvm-commits, zatrazz, dvyukov, rengolin

Subscribers: aemerson, rengolin, tberghammer, danalbert, srhines

Differential Revision: http://reviews.llvm.org/D18526

llvm-svn: 265366
This commit is contained in:
Yabin Cui 2016-04-04 23:48:25 +00:00
parent 393b79ee00
commit e3f558ba14
1 changed files with 15 additions and 0 deletions
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15
compiler-rt/lib/tsan/rtl/tsan_platform_linux.cc
View File

@ -36,6 +36,7 @@
#include <string.h>
#include <stdarg.h>
#include <sys/mman.h>
#include <sys/personality.h>
#include <sys/syscall.h>
#include <sys/socket.h>
#include <sys/time.h>
@ -291,6 +292,20 @@ void InitializePlatform() {
SetAddressSpaceUnlimited();
reexec = true;
}
#if defined(__aarch64__)
// After patch "arm64: mm: support ARCH_MMAP_RND_BITS." is introduced in
// linux kernel, the random gap between stack and mapped area is increased
// from 128M to 36G on 39-bit aarch64. As it is almost impossible to cover
// this big range, we should disable randomized virtual space on aarch64.
int old_personality = personality(0xffffffff);
if (old_personality != -1 && (old_personality & ADDR_NO_RANDOMIZE) == 0) {
VReport(1, "WARNING: Program is run with randomized virtual address "
"space, which wouldn't work with ThreadSanitizer.\n"
"Re-execing with fixed virtual address space.\n");
CHECK_NE(personality(old_personality | ADDR_NO_RANDOMIZE), -1);
reexec = true;
}
#endif
if (reexec)
ReExec();
}