derek.holloway
7502bf64a4
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60 lines
2.4 KiB
C
60 lines
2.4 KiB
C
// RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - %s | FileCheck -check-prefixes CHECK,WITHOUT %s
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// RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - %s -fsanitize=memory | FileCheck -check-prefixes CHECK,MSAN %s
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// RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - %s -fsanitize=kernel-memory | FileCheck -check-prefixes CHECK,KMSAN %s
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// RUN: %clang -target x86_64-linux-gnu -S -emit-llvm -o - %s -fsanitize=memory -fno-sanitize-memory-param-retval | FileCheck -check-prefixes CHECK,MSAN,RETTLS %s
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// Instrumented function.
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// MSan uses memset(addr, -1, size) to poison allocas and stores shadow of the return value in
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// __msan_retval_tls. KMSAN uses __msan_poison_alloca() to poison allocas and calls
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// __msan_get_context_state() at function prologue to access the task context struct (including the
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// shadow of the return value).
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//
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// CHECK-LABEL: i32 @instrumented1
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// KMSAN: __msan_get_context_state
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// WITHOUT-NOT: __msan_poison_alloca
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// WITHOUT-NOT: @llvm.memset
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// MSAN: @llvm.memset{{.*}}({{.*}}, i8 -1
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// KMSAN: __msan_poison_alloca
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// WITHOUT-NOT: __msan_retval_tls
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// RETTLS: __msan_retval_tls
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// CHECK: ret i32
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int instrumented1(int *a) {
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volatile char buf[8];
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return *a;
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}
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// Function with no_sanitize("memory")/no_sanitize("kernel-memory"): no shadow propagation, but
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// unpoisons memory to prevent false positives.
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// MSan uses memset(addr, 0, size) to unpoison locals, KMSAN uses __msan_unpoison_alloca(). Both
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// tools still access the retval shadow to write 0 to it.
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//
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// CHECK-LABEL: i32 @no_false_positives1
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// KMSAN: __msan_get_context_state
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// WITHOUT-NOT: __msan_unpoison_alloca
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// WITHOUT-NOT: @llvm.memset
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// MSAN: @llvm.memset{{.*}}({{.*}}, i8 0
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// KMSAN: __msan_unpoison_alloca
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// WITHOUT-NOT: __msan_retval_tls
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// RETTLS: __msan_retval_tls
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// CHECK: ret i32
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__attribute__((no_sanitize("memory"))) __attribute__((no_sanitize("kernel-memory"))) int no_false_positives1(int *a) {
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volatile char buf[8];
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return *a;
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}
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// Function with disable_sanitizer_instrumentation: no instrumentation at all.
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//
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// CHECK-LABEL: i32 @no_instrumentation1
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// KMSAN-NOT: __msan_get_context_state
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// WITHOUT-NOT: __msan_poison_alloca
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// WITHOUT-NOT: @llvm.memset
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// MSAN-NOT: @llvm.memset{{.*}}({{.*}}, i8 0
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// KMSAN-NOT: __msan_unpoison_alloca
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// WITHOUT-NOT: __msan_retval_tls
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// MSAN-NOT: __msan_retval_tls
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// CHECK: ret i32
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__attribute__((disable_sanitizer_instrumentation)) int no_instrumentation1(int *a) {
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volatile char buf[8];
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return *a;
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}
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