dfa8732d05
For the AllocToken pass to accurately calculate token ID hints, we need to attach `!alloc_token` metadata for allocation calls. Unlike new expressions, untyped allocation calls (like `malloc`, `calloc`, `::operator new(..)`, `__builtin_operator_new`, etc.) have no syntactic type associated with them. For -fsanitize=alloc-token, type hints are sufficient, and we can attempt to infer the type based on common idioms. When encountering allocation calls (with `__attribute__((malloc))` or `__attribute__((alloc_size(..))`), attach `!alloc_token` by inferring the allocated type from (a) sizeof argument expressions such as `malloc(sizeof(MyType))`, and (b) casts such as `(MyType*)malloc(4096)`. Note that non-standard allocation functions with these attributes are not instrumented by default. Use `-fsanitize-alloc-token-extended` to instrument them as well. Link: https://discourse.llvm.org/t/rfc-a-framework-for-allocator-partitioning-hints/87434 --- This change is part of the following series: 1. https://github.com/llvm/llvm-project/pull/160131 2. https://github.com/llvm/llvm-project/pull/156838 3. https://github.com/llvm/llvm-project/pull/162098 4. https://github.com/llvm/llvm-project/pull/162099 5. https://github.com/llvm/llvm-project/pull/156839 6. https://github.com/llvm/llvm-project/pull/156840 7. https://github.com/llvm/llvm-project/pull/156841 8. https://github.com/llvm/llvm-project/pull/156842
41 lines
2.1 KiB
C
41 lines
2.1 KiB
C
// RUN: %clang_cc1 -fsanitize=alloc-token -triple x86_64-linux-gnu -emit-llvm -disable-llvm-passes %s -o - | FileCheck %s
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typedef __typeof(sizeof(int)) size_t;
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void *aligned_alloc(size_t alignment, size_t size) __attribute__((malloc));
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void *malloc(size_t size) __attribute__((malloc));
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void *calloc(size_t num, size_t size) __attribute__((malloc));
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void *realloc(void *ptr, size_t size) __attribute__((malloc));
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void *reallocarray(void *ptr, size_t nmemb, size_t size) __attribute__((malloc));
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void *memalign(size_t alignment, size_t size) __attribute__((malloc));
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void *valloc(size_t size) __attribute__((malloc));
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void *pvalloc(size_t size) __attribute__((malloc));
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int posix_memalign(void **memptr, size_t alignment, size_t size);
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void *sink;
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// CHECK-LABEL: define dso_local void @test_malloc_like(
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// CHECK: call noalias ptr @malloc(i64 noundef 4){{.*}} !alloc_token [[META_INT:![0-9]+]]
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// CHECK: call noalias ptr @calloc(i64 noundef 3, i64 noundef 4){{.*}} !alloc_token [[META_INT]]
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// CHECK: call noalias ptr @realloc(ptr noundef {{.*}}, i64 noundef 8){{.*}} !alloc_token [[META_LONG:![0-9]+]]
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// CHECK: call noalias ptr @reallocarray(ptr noundef {{.*}}, i64 noundef 5, i64 noundef 8), !alloc_token [[META_LONG]]
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// CHECK: call noalias align 128 ptr @aligned_alloc(i64 noundef 128, i64 noundef 4){{.*}} !alloc_token [[META_INT]]
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// CHECK: call noalias align 16 ptr @memalign(i64 noundef 16, i64 noundef 4){{.*}} !alloc_token [[META_INT]]
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// CHECK: call noalias ptr @valloc(i64 noundef 4), !alloc_token [[META_INT]]
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// CHECK: call noalias ptr @pvalloc(i64 noundef 4), !alloc_token [[META_INT]]
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// CHECK: call i32 @posix_memalign(ptr noundef @sink, i64 noundef 64, i64 noundef 4)
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void test_malloc_like() {
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sink = malloc(sizeof(int));
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sink = calloc(3, sizeof(int));
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sink = realloc(sink, sizeof(long));
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sink = reallocarray(sink, 5, sizeof(long));
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sink = aligned_alloc(128, sizeof(int));
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sink = memalign(16, sizeof(int));
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sink = valloc(sizeof(int));
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sink = pvalloc(sizeof(int));
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posix_memalign(&sink, 64, sizeof(int)); // FIXME: support posix_memalign
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}
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// CHECK: [[META_INT]] = !{!"int", i1 false}
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// CHECK: [[META_LONG]] = !{!"long", i1 false}
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