From e1856ce1ee4d4ef25c6005bedb23206dbc20161c Mon Sep 17 00:00:00 2001 From: Anna Zaks Date: Tue, 4 Oct 2016 19:02:29 +0000 Subject: [PATCH] [asan] LLVM: Switch to using dynamic shadow offset on iOS The VM layout is not stable between iOS version releases, so switch to dynamic shadow offset. This is the LLVM counterpart of https://reviews.llvm.org/D25218 Differential Revision: https://reviews.llvm.org/D25219 llvm-svn: 283239 --- lib/Transforms/Instrumentation/AddressSanitizer.cpp | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/lib/Transforms/Instrumentation/AddressSanitizer.cpp b/lib/Transforms/Instrumentation/AddressSanitizer.cpp index 5442a099b4a..f08672a5857 100644 --- a/lib/Transforms/Instrumentation/AddressSanitizer.cpp +++ b/lib/Transforms/Instrumentation/AddressSanitizer.cpp @@ -69,7 +69,6 @@ static const uint64_t kDefaultShadowOffset32 = 1ULL << 29; static const uint64_t kDefaultShadowOffset64 = 1ULL << 44; static const uint64_t kDynamicShadowSentinel = ~(uint64_t)0; static const uint64_t kIOSShadowOffset32 = 1ULL << 30; -static const uint64_t kIOSShadowOffset64 = 0x120200000; static const uint64_t kIOSSimShadowOffset32 = 1ULL << 30; static const uint64_t kIOSSimShadowOffset64 = kDefaultShadowOffset64; static const uint64_t kSmallX86_64ShadowOffset = 0x7FFF8000; // < 2G. @@ -434,7 +433,9 @@ static ShadowMapping getShadowMapping(Triple &TargetTriple, int LongSize, Mapping.Offset = kMIPS64_ShadowOffset64; else if (IsIOS) // If we're targeting iOS and x86, the binary is built for iOS simulator. - Mapping.Offset = IsX86_64 ? kIOSSimShadowOffset64 : kIOSShadowOffset64; + // We are using dynamic shadow offset on the 64-bit devices. + Mapping.Offset = + IsX86_64 ? kIOSSimShadowOffset64 : kDynamicShadowSentinel; else if (IsAArch64) Mapping.Offset = kAArch64_ShadowOffset64; else