[PATCH] D44827: hwasan: add -hwasan-match-all-tag flag
Evgenii Stepanov via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Wed Apr 4 13:49:26 PDT 2018
This revision was automatically updated to reflect the committed changes.
Closed by commit rL329228: hwasan: add -hwasan-match-all-tag flag (authored by eugenis, committed by ).
Herald added a subscriber: llvm-commits.
Changed prior to commit:
https://reviews.llvm.org/D44827?vs=140071&id=141049#toc
Repository:
rL LLVM
https://reviews.llvm.org/D44827
Files:
llvm/trunk/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
llvm/trunk/test/Instrumentation/HWAddressSanitizer/kernel.ll
Index: llvm/trunk/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
===================================================================
--- llvm/trunk/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
+++ llvm/trunk/lib/Transforms/Instrumentation/HWAddressSanitizer.cpp
@@ -101,6 +101,11 @@
cl::desc("offset of hwasan shadow mapping [EXPERIMENTAL]"), cl::Hidden,
cl::init(0));
+static cl::opt<int> ClMatchAllTag(
+ "hwasan-match-all-tag",
+ cl::desc("don't report bad accesses via pointers with this tag"), cl::Hidden,
+ cl::init(-1));
+
static cl::opt<bool> ClEnableKhwasan(
"hwasan-kernel", cl::desc("Enable KernelHWAddressSanitizer instrumentation"),
cl::Hidden, cl::init(false));
@@ -330,6 +335,12 @@
IRB.CreateLoad(IRB.CreateIntToPtr(ShadowLong, IRB.getInt8PtrTy()));
Value *TagMismatch = IRB.CreateICmpNE(PtrTag, MemTag);
+ if (ClMatchAllTag != -1) {
+ Value *TagNotIgnored = IRB.CreateICmpNE(PtrTag,
+ ConstantInt::get(PtrTag->getType(), ClMatchAllTag));
+ TagMismatch = IRB.CreateAnd(TagMismatch, TagNotIgnored);
+ }
+
TerminatorInst *CheckTerm =
SplitBlockAndInsertIfThen(TagMismatch, InsertBefore, !Recover,
MDBuilder(*C).createBranchWeights(1, 100000));
Index: llvm/trunk/test/Instrumentation/HWAddressSanitizer/kernel.ll
===================================================================
--- llvm/trunk/test/Instrumentation/HWAddressSanitizer/kernel.ll
+++ llvm/trunk/test/Instrumentation/HWAddressSanitizer/kernel.ll
@@ -1,10 +1,11 @@
; Test kernel hwasan instrumentation.
;
; RUN: opt < %s -hwasan -hwasan-kernel=1 -S | FileCheck %s --allow-empty --check-prefixes=INIT
-; RUN: opt < %s -hwasan -hwasan-kernel=1 -S | FileCheck %s --check-prefixes=CHECK,NOOFFSET
-; RUN: opt < %s -hwasan -hwasan-kernel=1 -hwasan-mapping-offset=12345678 -S | FileCheck %s --check-prefixes=CHECK,OFFSET
-; RUN: opt < %s -hwasan -hwasan-kernel=1 -hwasan-recover=0 -S | FileCheck %s --check-prefixes=CHECK,NOOFFSET,ABORT
-; RUN: opt < %s -hwasan -hwasan-kernel=1 -hwasan-recover=1 -S | FileCheck %s --check-prefixes=CHECK,NOOFFSET,RECOVER
+; RUN: opt < %s -hwasan -hwasan-kernel=1 -S | FileCheck %s --check-prefixes=CHECK,NOOFFSET,NO-MATCH-ALL
+; RUN: opt < %s -hwasan -hwasan-kernel=1 -hwasan-mapping-offset=12345678 -S | FileCheck %s --check-prefixes=CHECK,OFFSET,NO-MATCH-ALL
+; RUN: opt < %s -hwasan -hwasan-kernel=1 -hwasan-recover=0 -S | FileCheck %s --check-prefixes=CHECK,NOOFFSET,ABORT,NO-MATCH-ALL
+; RUN: opt < %s -hwasan -hwasan-kernel=1 -hwasan-recover=1 -S | FileCheck %s --check-prefixes=CHECK,NOOFFSET,RECOVER,NO-MATCH-ALL
+; RUN: opt < %s -hwasan -hwasan-kernel=1 -hwasan-recover=1 -hwasan-match-all-tag=0xff -S | FileCheck %s --check-prefixes=CHECK,NOOFFSET,RECOVER,MATCH-ALL
target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64--linux-android"
@@ -24,7 +25,12 @@
; CHECK: %[[MEMTAG:[^ ]*]] = load i8, i8* %[[E]]
; CHECK: %[[F:[^ ]*]] = icmp ne i8 %[[PTRTAG]], %[[MEMTAG]]
-; CHECK: br i1 %[[F]], label {{.*}}, label {{.*}}, !prof {{.*}}
+
+; MATCH-ALL: %[[G:[^ ]*]] = icmp ne i8 %[[PTRTAG]], -1
+; MATCH-ALL: %[[H:[^ ]*]] = and i1 %[[F]], %[[G]]
+; MATCH-ALL: br i1 %[[H]], label {{.*}}, label {{.*}}, !prof {{.*}}
+
+; NO-MATCH-ALL: br i1 %[[F]], label {{.*}}, label {{.*}}, !prof {{.*}}
; ABORT: call void asm sideeffect "brk #2304", "{x0}"(i64 %[[A]])
; ABORT: unreachable
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