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30b20f259e
Summary: ICF prevented by removing unnamed_addr and local_unnamed_addr for all sanitized globals. Also in general unnamed_addr is not valid here as address now is important for ODR violation detector and redzone poisoning. Before the patch ICF on globals caused: 1. false ODR reports when we register global on the same address more than once 2. globals buffer overflow if we fold variables of smaller type inside of large type. Then the smaller one will poison redzone which overlaps with the larger one. Reviewers: eugenis, pcc Subscribers: hiraditya, llvm-commits Differential Revision: https://reviews.llvm.org/D55857 llvm-svn: 349706
75 lines
3.7 KiB
LLVM
75 lines
3.7 KiB
LLVM
; RUN: opt < %s -asan -asan-module -asan-globals-live-support=1 -S | FileCheck %s
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; RUN: opt < %s -asan -asan-module -asan-globals-live-support=1 -asan-mapping-scale=5 -S | FileCheck %s
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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; Globals:
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@global = global i32 0, align 4
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@dyn_init_global = global i32 0, align 4
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@blacklisted_global = global i32 0, align 4
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@_ZZ4funcvE10static_var = internal global i32 0, align 4
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@.str = private unnamed_addr constant [14 x i8] c"Hello, world!\00", align 1
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@llvm.global_ctors = appending global [1 x { i32, void ()*, i8* }] [{ i32, void ()*, i8* } { i32 65535, void ()* @_GLOBAL__sub_I_asan_globals.cpp, i8* null }]
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; Check that globals were instrumented:
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; CHECK: @global = global { i32, [60 x i8] } zeroinitializer, comdat, align 32
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; CHECK: @.str = internal constant { [14 x i8], [50 x i8] } { [14 x i8] c"Hello, world!\00", [50 x i8] zeroinitializer }, comdat($".str${{[01-9a-f]+}}"), align 32
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; Check emitted location descriptions:
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; CHECK: [[VARNAME:@___asan_gen_.[0-9]+]] = private unnamed_addr constant [7 x i8] c"global\00", align 1
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; CHECK: [[FILENAME:@___asan_gen_.[0-9]+]] = private unnamed_addr constant [22 x i8] c"/tmp/asan-globals.cpp\00", align 1
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; CHECK: [[LOCDESCR:@___asan_gen_.[0-9]+]] = private unnamed_addr constant { [22 x i8]*, i32, i32 } { [22 x i8]* [[FILENAME]], i32 5, i32 5 }
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; CHECK: @__asan_global_global = {{.*}}i64 ptrtoint ({ i32, [60 x i8] }* @global to i64){{.*}} section "asan_globals"{{.*}}, !associated
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; CHECK: @__asan_global_.str = {{.*}}i64 ptrtoint ({ [14 x i8], [50 x i8] }* @{{.str|1}} to i64){{.*}} section "asan_globals"{{.*}}, !associated
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; The metadata has to be inserted to llvm.compiler.used to avoid being stripped
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; during LTO.
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; CHECK: @llvm.compiler.used {{.*}} @__asan_global_global {{.*}} section "llvm.metadata"
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; Check that location descriptors and global names were passed into __asan_register_globals:
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; CHECK: call void @__asan_register_elf_globals(i64 ptrtoint (i64* @___asan_globals_registered to i64), i64 ptrtoint (i64* @__start_asan_globals to i64), i64 ptrtoint (i64* @__stop_asan_globals to i64))
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; Function Attrs: nounwind sanitize_address
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define internal void @__cxx_global_var_init() #0 section ".text.startup" {
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entry:
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%0 = load i32, i32* @global, align 4
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store i32 %0, i32* @dyn_init_global, align 4
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ret void
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}
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; Function Attrs: nounwind sanitize_address
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define void @_Z4funcv() #1 {
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entry:
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%literal = alloca i8*, align 8
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store i8* getelementptr inbounds ([14 x i8], [14 x i8]* @.str, i32 0, i32 0), i8** %literal, align 8
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ret void
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}
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; Function Attrs: nounwind sanitize_address
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define internal void @_GLOBAL__sub_I_asan_globals.cpp() #0 section ".text.startup" {
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entry:
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call void @__cxx_global_var_init()
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ret void
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}
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attributes #0 = { nounwind sanitize_address }
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attributes #1 = { nounwind sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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!llvm.asan.globals = !{!0, !1, !2, !3, !4}
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!llvm.ident = !{!5}
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!0 = !{i32* @global, !6, !"global", i1 false, i1 false}
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!1 = !{i32* @dyn_init_global, !7, !"dyn_init_global", i1 true, i1 false}
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!2 = !{i32* @blacklisted_global, null, null, i1 false, i1 true}
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!3 = !{i32* @_ZZ4funcvE10static_var, !8, !"static_var", i1 false, i1 false}
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!4 = !{[14 x i8]* @.str, !9, !"<string literal>", i1 false, i1 false}
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!5 = !{!"clang version 3.5.0 (211282)"}
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!6 = !{!"/tmp/asan-globals.cpp", i32 5, i32 5}
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!7 = !{!"/tmp/asan-globals.cpp", i32 7, i32 5}
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!8 = !{!"/tmp/asan-globals.cpp", i32 12, i32 14}
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!9 = !{!"/tmp/asan-globals.cpp", i32 14, i32 25}
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