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531c210570
The current code does not take alloca array size into account and, as a result, considers any access past the first array element to be unsafe. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254350 91177308-0d34-0410-b5e6-96231b3b80d8
87 lines
2.7 KiB
LLVM
87 lines
2.7 KiB
LLVM
; RUN: opt -safe-stack -S -mtriple=i386-pc-linux-gnu < %s -o - | FileCheck %s
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; RUN: opt -safe-stack -S -mtriple=x86_64-pc-linux-gnu < %s -o - | FileCheck %s
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; array [4 x i8]
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; Requires protector.
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define void @foo(i8* %a) nounwind uwtable safestack {
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entry:
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; CHECK: %[[USP:.*]] = load i8*, i8** @__safestack_unsafe_stack_ptr
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; CHECK: %[[USST:.*]] = getelementptr i8, i8* %[[USP]], i32 -16
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; CHECK: store i8* %[[USST]], i8** @__safestack_unsafe_stack_ptr
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; CHECK: %[[AADDR:.*]] = alloca i8*, align 8
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%a.addr = alloca i8*, align 8
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; CHECK: %[[BUFPTR:.*]] = getelementptr i8, i8* %[[USP]], i32 -4
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; CHECK: %[[BUFPTR2:.*]] = bitcast i8* %[[BUFPTR]] to [4 x i8]*
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%buf = alloca [4 x i8], align 1
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; CHECK: store i8* {{.*}}, i8** %[[AADDR]], align 8
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store i8* %a, i8** %a.addr, align 8
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; CHECK: %[[GEP:.*]] = getelementptr inbounds [4 x i8], [4 x i8]* %[[BUFPTR2]], i32 0, i32 0
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%gep = getelementptr inbounds [4 x i8], [4 x i8]* %buf, i32 0, i32 0
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; CHECK: %[[A2:.*]] = load i8*, i8** %[[AADDR]], align 8
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%a2 = load i8*, i8** %a.addr, align 8
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; CHECK: call i8* @strcpy(i8* %[[GEP]], i8* %[[A2]])
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%call = call i8* @strcpy(i8* %gep, i8* %a2)
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; CHECK: store i8* %[[USP]], i8** @__safestack_unsafe_stack_ptr
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ret void
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}
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; Load from an array at a fixed offset, no overflow.
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define i8 @StaticArrayFixedSafe() nounwind uwtable safestack {
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entry:
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; CHECK-LABEL: define i8 @StaticArrayFixedSafe(
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; CHECK-NOT: __safestack_unsafe_stack_ptr
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; CHECK: ret i8
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%buf = alloca i8, i32 4, align 1
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%gep = getelementptr inbounds i8, i8* %buf, i32 2
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%x = load i8, i8* %gep, align 1
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ret i8 %x
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}
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; Load from an array at a fixed offset with overflow.
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define i8 @StaticArrayFixedUnsafe() nounwind uwtable safestack {
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entry:
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; CHECK-LABEL: define i8 @StaticArrayFixedUnsafe(
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; CHECK: __safestack_unsafe_stack_ptr
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; CHECK: ret i8
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%buf = alloca i8, i32 4, align 1
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%gep = getelementptr inbounds i8, i8* %buf, i32 5
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%x = load i8, i8* %gep, align 1
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ret i8 %x
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}
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; Load from an array at an unknown offset.
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define i8 @StaticArrayVariableUnsafe(i32 %ofs) nounwind uwtable safestack {
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entry:
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; CHECK-LABEL: define i8 @StaticArrayVariableUnsafe(
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; CHECK: __safestack_unsafe_stack_ptr
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; CHECK: ret i8
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%buf = alloca i8, i32 4, align 1
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%gep = getelementptr inbounds i8, i8* %buf, i32 %ofs
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%x = load i8, i8* %gep, align 1
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ret i8 %x
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}
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; Load from an array of an unknown size.
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define i8 @DynamicArrayUnsafe(i32 %sz) nounwind uwtable safestack {
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entry:
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; CHECK-LABEL: define i8 @DynamicArrayUnsafe(
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; CHECK: __safestack_unsafe_stack_ptr
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; CHECK: ret i8
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%buf = alloca i8, i32 %sz, align 1
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%gep = getelementptr inbounds i8, i8* %buf, i32 2
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%x = load i8, i8* %gep, align 1
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ret i8 %x
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}
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declare i8* @strcpy(i8*, i8*)
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