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| author | Kuba Mracek <mracek@apple.com> | 2017-07-12 23:29:21 +0000 |
|---|---|---|
| committer | Kuba Mracek <mracek@apple.com> | 2017-07-12 23:29:21 +0000 |
| commit | b40ba7db5e71b65a5c6a12d997403bf8fbac35f3 (patch) | |
| tree | 8609b70a6931a307125d9575c14ee4ce873bcc77 /lib/asan/asan_internal.h | |
| parent | 1832be2ba37b2ca197edf7239eead2f5b43ed838 (diff) | |
| download | compiler-rt-b40ba7db5e71b65a5c6a12d997403bf8fbac35f3.tar.gz | |
[asan] For iOS/AArch64, if the dynamic shadow doesn't fit, restrict the VM space
On iOS/AArch64, the address space is very limited and has a dynamic maximum address based on the configuration of the device. We're already using a dynamic shadow, and we find a large-enough "gap" in the VM where we place the shadow memory. In some cases and some device configuration, we might not be able to find a large-enough gap: E.g. if the main executable is linked against a large number of libraries that are not part of the system, these libraries can fragment the address space, and this happens before ASan starts initializing.
This patch has a solution, where we have a "backup plan" when we cannot find a large-enough gap: We will restrict the address space (via MmapFixedNoAccess) to a limit, for which the shadow limit will fit.
Differential Revision: https://reviews.llvm.org/D35098
git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@307865 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/asan/asan_internal.h')
| -rw-r--r-- | lib/asan/asan_internal.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/asan/asan_internal.h b/lib/asan/asan_internal.h index 3b7069524..f09bbd83a 100644 --- a/lib/asan/asan_internal.h +++ b/lib/asan/asan_internal.h @@ -75,6 +75,7 @@ void NORETURN ShowStatsAndAbort(); void ReplaceSystemMalloc(); // asan_linux.cc / asan_mac.cc / asan_win.cc +uptr FindDynamicShadowStart(); void *AsanDoesNotSupportStaticLinkage(); void AsanCheckDynamicRTPrereqs(); void AsanCheckIncompatibleRT(); |