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llvm-mirror/test/Instrumentation/AddressSanitizer/stack-poisoning-and-lifetime.ll
Hans Wennborg db19639e06 Asan use-after-scope: don't poison allocas if there were untraced lifetime intrinsics in the function (PR41481) 
If there are any intrinsics that cannot be traced back to an alloca, we
might have missed the start of a variable's scope, leading to false
error reports if the variable is poisoned at function entry. Instead, if
there are some intrinsics that can't be traced, fail safe and don't
poison the variables in that function.

Differential revision: https://reviews.llvm.org/D60686

llvm-svn: 358478
2019-04-16 07:54:20 +00:00

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; Regular stack poisoning.
; RUN: opt < %s -asan -asan-module -asan-use-after-scope=0 -S | FileCheck --check-prefixes=CHECK,ENTRY,EXIT %s
; Stack poisoning with stack-use-after-scope.
; RUN: opt < %s -asan -asan-module -asan-use-after-scope=1 -S | FileCheck --check-prefixes=CHECK,ENTRY-UAS,EXIT-UAS %s
target datalayout = "e-i64:64-f80:128-s:64-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
declare void @Foo(i8*)
define void @Bar() uwtable sanitize_address {
entry:
%x = alloca [650 x i8], align 16
%xx = getelementptr inbounds [650 x i8], [650 x i8]* %x, i64 0, i64 0
%y = alloca [13 x i8], align 1
%yy = getelementptr inbounds [13 x i8], [13 x i8]* %y, i64 0, i64 0
%z = alloca [40 x i8], align 1
%zz = getelementptr inbounds [40 x i8], [40 x i8]* %z, i64 0, i64 0
; CHECK: [[SHADOW_BASE:%[0-9]+]] = add i64 %{{[0-9]+}}, 2147450880
; F1F1F1F1
; ENTRY-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 0
; ENTRY-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i32]]*
; ENTRY-NEXT: store [[TYPE]] -235802127, [[TYPE]]* [[PTR]], align 1
; 02F2F2F2F2F2F2F2
; ENTRY-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 85
; ENTRY-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; ENTRY-NEXT: store [[TYPE]] -940422246894996990, [[TYPE]]* [[PTR]], align 1
; F2F2F2F2F2F2F2F2
; ENTRY-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 93
; ENTRY-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; ENTRY-NEXT: store [[TYPE]] -940422246894996750, [[TYPE]]* [[PTR]], align 1
; F20005F2F2000000
; ENTRY-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 101
; ENTRY-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; ENTRY-NEXT: store [[TYPE]] 1043442499826, [[TYPE]]* [[PTR]], align 1
; F3F3F3F3
; ENTRY-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 111
; ENTRY-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i32]]*
; ENTRY-NEXT: store [[TYPE]] -202116109, [[TYPE]]* [[PTR]], align 1
; F3
; ENTRY-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 115
; ENTRY-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i8]]*
; ENTRY-NEXT: store [[TYPE]] -13, [[TYPE]]* [[PTR]], align 1
; F1F1F1F1
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 0
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i32]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -235802127, [[TYPE]]* [[PTR]], align 1
; F8F8F8...
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 4
; ENTRY-UAS-NEXT: call void @__asan_set_shadow_f8(i64 [[OFFSET]], i64 82)
; F2F2F2F2F2F2F2F2
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 86
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -940422246894996750, [[TYPE]]* [[PTR]], align 1
; F2F2F2F2F2F2F2F2
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 94
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -940422246894996750, [[TYPE]]* [[PTR]], align 1
; F8F8F2F2F8F8F8F8
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 102
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -506381209967593224, [[TYPE]]* [[PTR]], align 1
; F8F3F3F3
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 110
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i32]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -202116104, [[TYPE]]* [[PTR]], align 1
; F3F3
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 114
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i16]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -3085, [[TYPE]]* [[PTR]], align 1
; CHECK-LABEL: %xx = getelementptr inbounds
; CHECK-NEXT: %yy = getelementptr inbounds
; CHECK-NEXT: %zz = getelementptr inbounds
call void @llvm.lifetime.start.p0i8(i64 650, i8* %xx)
; 0000...
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 4
; ENTRY-UAS-NEXT: call void @__asan_set_shadow_00(i64 [[OFFSET]], i64 81)
; 02
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 85
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i8]]*
; ENTRY-UAS-NEXT: store [[TYPE]] 2, [[TYPE]]* [[PTR]], align 1
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 650, i8* %xx)
call void @Foo(i8* %xx)
; CHECK-NEXT: call void @Foo(i8* %xx)
call void @llvm.lifetime.end.p0i8(i64 650, i8* %xx)
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 4
; ENTRY-UAS-NEXT: call void @__asan_set_shadow_f8(i64 [[OFFSET]], i64 82)
; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 650, i8* %xx)
call void @llvm.lifetime.start.p0i8(i64 13, i8* %yy)
; 0005
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 102
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i16]]*
; ENTRY-UAS-NEXT: store [[TYPE]] 1280, [[TYPE]]* [[PTR]], align 1
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 13, i8* %yy)
call void @Foo(i8* %yy)
; CHECK-NEXT: call void @Foo(i8* %yy)
call void @llvm.lifetime.end.p0i8(i64 13, i8* %yy)
; F8F8
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 102
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i16]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -1800, [[TYPE]]* [[PTR]], align 1
; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 13, i8* %yy)
call void @llvm.lifetime.start.p0i8(i64 40, i8* %zz)
; 00000000
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 106
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i32]]*
; ENTRY-UAS-NEXT: store [[TYPE]] 0, [[TYPE]]* [[PTR]], align 1
; 00
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 110
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i8]]*
; ENTRY-UAS-NEXT: store [[TYPE]] 0, [[TYPE]]* [[PTR]], align 1
; CHECK-NEXT: call void @llvm.lifetime.start.p0i8(i64 40, i8* %zz)
call void @Foo(i8* %zz)
; CHECK-NEXT: call void @Foo(i8* %zz)
call void @llvm.lifetime.end.p0i8(i64 40, i8* %zz)
; F8F8F8F8
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 106
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i32]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -117901064, [[TYPE]]* [[PTR]], align 1
; F8
; ENTRY-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 110
; ENTRY-UAS-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i8]]*
; ENTRY-UAS-NEXT: store [[TYPE]] -8, [[TYPE]]* [[PTR]], align 1
; CHECK-NEXT: call void @llvm.lifetime.end.p0i8(i64 40, i8* %zz)
; CHECK: {{^[0-9]+}}:
; CHECK-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 0
; CHECK-NEXT: call void @__asan_set_shadow_f5(i64 [[OFFSET]], i64 128)
; CHECK-NOT: add i64 [[SHADOW_BASE]]
; CHECK: {{^[0-9]+}}:
; 00000000
; EXIT-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 0
; EXIT-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i32]]*
; EXIT-NEXT: store [[TYPE]] 0, [[TYPE]]* [[PTR]], align 1
; 0000000000000000
; EXIT-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 85
; EXIT-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; EXIT-NEXT: store [[TYPE]] 0, [[TYPE]]* [[PTR]], align 1
; 0000000000000000
; EXIT-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 93
; EXIT-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; EXIT-NEXT: store [[TYPE]] 0, [[TYPE]]* [[PTR]], align 1
; 0000000000000000
; EXIT-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 101
; EXIT-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i64]]*
; EXIT-NEXT: store [[TYPE]] 0, [[TYPE]]* [[PTR]], align 1
; 00000000
; EXIT-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 111
; EXIT-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i32]]*
; EXIT-NEXT: store [[TYPE]] 0, [[TYPE]]* [[PTR]], align 1
; 00
; EXIT-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 115
; EXIT-NEXT: [[PTR:%[0-9]+]] = inttoptr i64 [[OFFSET]] to [[TYPE:i8]]*
; EXIT-NEXT: store [[TYPE]] 0, [[TYPE]]* [[PTR]], align 1
; 0000...
; EXIT-UAS-NEXT: [[OFFSET:%[0-9]+]] = add i64 [[SHADOW_BASE]], 0
; EXIT-UAS-NEXT: call void @__asan_set_shadow_00(i64 [[OFFSET]], i64 116)
; CHECK-NOT: add i64 [[SHADOW_BASE]]
ret void
; CHECK: {{^[0-9]+}}:
; CHECK: ret void
}
declare void @foo(i32*)
define void @PR41481(i1 %b) sanitize_address {
; CHECK-LABEL: @PR41481
entry:
%p1 = alloca i32
%p2 = alloca i32
%q1 = bitcast i32* %p1 to i8*
%q2 = bitcast i32* %p2 to i8*
br label %bb1
; Since we cannot account for all lifetime intrinsics in this function, we
; might have missed a lifetime.start one and therefore shouldn't poison the
; allocas at function entry.
; ENTRY: store i64 -935356719533264399
; ENTRY-UAS: store i64 -935356719533264399
bb1:
%p = select i1 %b, i32* %p1, i32* %p2
%q = select i1 %b, i8* %q1, i8* %q2
call void @llvm.lifetime.start.p0i8(i64 4, i8* %q)
call void @foo(i32* %p)
br i1 %b, label %bb2, label %bb3
bb2:
call void @llvm.lifetime.end.p0i8(i64 4, i8* %q1)
br label %end
bb3:
call void @llvm.lifetime.end.p0i8(i64 4, i8* %q2)
br label %end
end:
ret void
}
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture)
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture)
; CHECK-ON: declare void @__asan_set_shadow_00(i64, i64)
; CHECK-ON: declare void @__asan_set_shadow_f1(i64, i64)
; CHECK-ON: declare void @__asan_set_shadow_f2(i64, i64)
; CHECK-ON: declare void @__asan_set_shadow_f3(i64, i64)
; CHECK-ON: declare void @__asan_set_shadow_f5(i64, i64)
; CHECK-ON: declare void @__asan_set_shadow_f8(i64, i64)
; CHECK-OFF-NOT: declare void @__asan_set_shadow_
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