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[COFF, ARM64] Add support for MSVC buffer security check

Browse Source 
Reviewers: rnk, mstorsjo, compnerd, efriedma, TomTan

Reviewed By: rnk

Subscribers: javed.absar, kristof.beyls, chrib, llvm-commits

Differential Revision: https://reviews.llvm.org/D54248

llvm-svn: 346469
This commit is contained in:
Mandeep Singh Grang 2018-11-09 02:48:36 +00:00
parent 7f5a773b3e
commit 4404a659c5
3 changed files with 45 additions and 0 deletions
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33
lib/Target/AArch64/AArch64ISelLowering.cpp
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@ -11668,6 +11668,39 @@ Value *AArch64TargetLowering::getIRStackGuard(IRBuilder<> &IRB) const {
return TargetLowering::getIRStackGuard(IRB);
}
void AArch64TargetLowering::insertSSPDeclarations(Module &M) const {
// MSVC CRT provides functionalities for stack protection.
if (Subtarget->getTargetTriple().isWindowsMSVCEnvironment()) {
// MSVC CRT has a global variable holding security cookie.
M.getOrInsertGlobal("__security_cookie",
Type::getInt8PtrTy(M.getContext()));
// MSVC CRT has a function to validate security cookie.
auto *SecurityCheckCookie = cast<Function>(
M.getOrInsertFunction("__security_check_cookie",
Type::getVoidTy(M.getContext()),
Type::getInt8PtrTy(M.getContext())));
SecurityCheckCookie->setCallingConv(CallingConv::Win64);
SecurityCheckCookie->addAttribute(1, Attribute::AttrKind::InReg);
return;
}
TargetLowering::insertSSPDeclarations(M);
}
Value *AArch64TargetLowering::getSDagStackGuard(const Module &M) const {
// MSVC CRT has a global variable holding security cookie.
if (Subtarget->getTargetTriple().isWindowsMSVCEnvironment())
return M.getGlobalVariable("__security_cookie");
return TargetLowering::getSDagStackGuard(M);
}
Value *AArch64TargetLowering::getSSPStackGuardCheck(const Module &M) const {
// MSVC CRT has a function to validate security cookie.
if (Subtarget->getTargetTriple().isWindowsMSVCEnvironment())
return M.getFunction("__security_check_cookie");
return TargetLowering::getSSPStackGuardCheck(M);
}
Value *AArch64TargetLowering::getSafeStackPointerLocation(IRBuilder<> &IRB) const {
// Android provides a fixed TLS slot for the SafeStack pointer. See the
// definition of TLS_SLOT_SAFESTACK in

4
lib/Target/AArch64/AArch64ISelLowering.h
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@ -401,6 +401,10 @@ public:
/// returns the address of that location. Otherwise, returns nullptr.
Value *getIRStackGuard(IRBuilder<> &IRB) const override;
void insertSSPDeclarations(Module &M) const override;
Value *getSDagStackGuard(const Module &M) const override;
Value *getSSPStackGuardCheck(const Module &M) const override;
/// If the target has a standard location for the unsafe stack pointer,
/// returns the address of that location. Otherwise, returns nullptr.
Value *getSafeStackPointerLocation(IRBuilder<> &IRB) const override;

8
test/CodeGen/AArch64/stack-protector-target.ll
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@ -2,6 +2,7 @@
; RUN: llc -mtriple=aarch64-linux-android < %s -o - | FileCheck --check-prefix=ANDROID-AARCH64 %s
; RUN: llc -mtriple=aarch64-fuchsia < %s -o - | FileCheck --check-prefixes=FUCHSIA-AARCH64-COMMON,FUCHSIA-AARCH64-USER %s
; RUN: llc -mtriple=aarch64-fuchsia -code-model=kernel < %s -o - | FileCheck --check-prefixes=FUCHSIA-AARCH64-COMMON,FUCHSIA-AARCH64-KERNEL %s
; RUN: llc -mtriple=aarch64-windows < %s -o - | FileCheck --check-prefix=WINDOWS-AARCH64 %s
define void @_Z1fv() sspreq {
entry:
@ -27,3 +28,10 @@ declare void @_Z7CapturePi(i32*)
; FUCHSIA-AARCH64-COMMON: ldur [[C:.*]], {{\[}}[[A]], #-16]
; FUCHSIA-AARCH64-COMMON: ldr [[D:.*]], [sp,
; FUCHSIA-AARCH64-COMMON: cmp [[C]], [[D]]
; WINDOWS-AARCH64: adrp x8, __security_cookie
; WINDOWS-AARCH64: ldr x8, [x8, __security_cookie]
; WINDOWS-AARCH64: str x8, [sp, #8]
; WINDOWS-AARCH64: bl _Z7CapturePi
; WINDOWS-AARCH64: ldr x0, [sp, #8]
; WINDOWS-AARCH64: bl __security_check_cookie