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191 lines
6.2 KiB
C
191 lines
6.2 KiB
C
#ifndef INTERNAL_SANITIZERS_H /*-*-C-*-vi:se ft=c:*/
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#define INTERNAL_SANITIZERS_H
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/**
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* @file
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* @author Ruby developers <ruby-core@ruby-lang.org>
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* @copyright This file is a part of the programming language Ruby.
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* Permission is hereby granted, to either redistribute and/or
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* modify this file, provided that the conditions mentioned in the
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* file COPYING are met. Consult the file for details.
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* @brief Internal header for ASAN / MSAN / etc.
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*/
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#include "ruby/internal/config.h"
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#include "internal/compilers.h" /* for __has_feature */
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#ifdef HAVE_VALGRIND_MEMCHECK_H
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# include <valgrind/memcheck.h>
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#endif
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#ifdef HAVE_SANITIZER_ASAN_INTERFACE_H
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# include <sanitizer/asan_interface.h>
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#endif
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#ifdef HAVE_SANITIZER_MSAN_INTERFACE_H
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# if __has_feature(memory_sanitizer)
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# include <sanitizer/msan_interface.h>
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# endif
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#endif
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#include "ruby/internal/stdbool.h" /* for bool */
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#include "ruby/ruby.h" /* for VALUE */
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#if 0
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#elif __has_feature(memory_sanitizer) && __has_feature(address_sanitizer)
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# define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(x) \
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__attribute__((__no_sanitize__("memory, address"), __noinline__)) x
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#elif __has_feature(address_sanitizer)
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# define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(x) \
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__attribute__((__no_sanitize__("address"), __noinline__)) x
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#elif defined(NO_SANITIZE_ADDRESS)
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# define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(x) \
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NO_SANITIZE_ADDRESS(NOINLINE(x))
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#elif defined(NO_ADDRESS_SAFETY_ANALYSIS)
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# define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(x) \
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NO_ADDRESS_SAFETY_ANALYSIS(NOINLINE(x))
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#else
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# define ATTRIBUTE_NO_ADDRESS_SAFETY_ANALYSIS(x) x
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#endif
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#if defined(NO_SANITIZE) && RBIMPL_COMPILER_IS(GCC)
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/* GCC warns about unknown sanitizer, which is annoying. */
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# include "internal/warnings.h"
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# undef NO_SANITIZE
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# define NO_SANITIZE(x, y) \
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COMPILER_WARNING_PUSH; \
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COMPILER_WARNING_IGNORED(-Wattributes); \
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__attribute__((__no_sanitize__(x))) y; \
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COMPILER_WARNING_POP
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#endif
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#ifndef NO_SANITIZE
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# define NO_SANITIZE(x, y) y
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#endif
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#if !__has_feature(address_sanitizer)
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# define __asan_poison_memory_region(x, y)
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# define __asan_unpoison_memory_region(x, y)
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# define __asan_region_is_poisoned(x, y) 0
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#endif
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#if !__has_feature(memory_sanitizer)
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# define __msan_allocated_memory(x, y) ((void)(x), (void)(y))
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# define __msan_poison(x, y) ((void)(x), (void)(y))
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# define __msan_unpoison(x, y) ((void)(x), (void)(y))
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# define __msan_unpoison_string(x) ((void)(x))
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#endif
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#ifdef VALGRIND_MAKE_READABLE
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# define VALGRIND_MAKE_MEM_DEFINED(p, n) VALGRIND_MAKE_READABLE((p), (n))
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#endif
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#ifdef VALGRIND_MAKE_WRITABLE
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# define VALGRIND_MAKE_MEM_UNDEFINED(p, n) VALGRIND_MAKE_WRITABLE((p), (n))
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#endif
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#ifndef VALGRIND_MAKE_MEM_DEFINED
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# define VALGRIND_MAKE_MEM_DEFINED(p, n) 0
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#endif
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#ifndef VALGRIND_MAKE_MEM_UNDEFINED
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# define VALGRIND_MAKE_MEM_UNDEFINED(p, n) 0
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#endif
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#ifndef MJIT_HEADER
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/*!
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* This function asserts that a (continuous) memory region from ptr to size
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* being "poisoned". Both read / write access to such memory region are
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* prohibited until properly unpoisoned. The region must be previously
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* allocated (do not pass a freed pointer here), but not necessarily be an
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* entire object that the malloc returns. You can punch hole a part of a
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* gigantic heap arena. This is handy when you do not free an allocated memory
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* region to reuse later: poison when you keep it unused, and unpoison when you
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* reuse.
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*
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* \param[in] ptr pointer to the beginning of the memory region to poison.
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* \param[in] size the length of the memory region to poison.
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*/
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static inline void
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asan_poison_memory_region(const volatile void *ptr, size_t size)
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{
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__msan_poison(ptr, size);
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__asan_poison_memory_region(ptr, size);
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}
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/*!
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* This is a variant of asan_poison_memory_region that takes a VALUE.
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*
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* \param[in] obj target object.
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*/
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static inline void
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asan_poison_object(VALUE obj)
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{
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MAYBE_UNUSED(struct RVALUE *) ptr = (void *)obj;
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asan_poison_memory_region(ptr, SIZEOF_VALUE);
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}
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#if !__has_feature(address_sanitizer)
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#define asan_poison_object_if(ptr, obj) ((void)(ptr), (void)(obj))
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#else
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#define asan_poison_object_if(ptr, obj) do { \
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if (ptr) asan_poison_object(obj); \
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} while (0)
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#endif
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/*!
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* This function predicates if the given object is fully addressable or not.
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*
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* \param[in] obj target object.
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* \retval 0 the given object is fully addressable.
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* \retval otherwise pointer to first such byte who is poisoned.
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*/
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static inline void *
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asan_poisoned_object_p(VALUE obj)
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{
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MAYBE_UNUSED(struct RVALUE *) ptr = (void *)obj;
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return __asan_region_is_poisoned(ptr, SIZEOF_VALUE);
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}
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/*!
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* This function asserts that a (formally poisoned) memory region from ptr to
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* size is now addressable. Write access to such memory region gets allowed.
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* However read access might or might not be possible depending on situations,
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* because the region can have contents of previous usages. That information
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* should be passed by the malloc_p flag. If that is true, the contents of the
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* region is _not_ fully defined (like the return value of malloc behaves).
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* Reading from there is NG; write something first. If malloc_p is false on
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* the other hand, that memory region is fully defined and can be read
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* immediately.
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*
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* \param[in] ptr pointer to the beginning of the memory region to unpoison.
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* \param[in] size the length of the memory region.
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* \param[in] malloc_p if the memory region is like a malloc's return value or not.
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*/
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static inline void
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asan_unpoison_memory_region(const volatile void *ptr, size_t size, bool malloc_p)
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{
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__asan_unpoison_memory_region(ptr, size);
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if (malloc_p) {
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__msan_allocated_memory(ptr, size);
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}
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else {
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__msan_unpoison(ptr, size);
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}
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}
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/*!
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* This is a variant of asan_unpoison_memory_region that takes a VALUE.
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*
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* \param[in] obj target object.
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* \param[in] malloc_p if the memory region is like a malloc's return value or not.
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*/
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static inline void
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asan_unpoison_object(VALUE obj, bool newobj_p)
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{
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MAYBE_UNUSED(struct RVALUE *) ptr = (void *)obj;
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asan_unpoison_memory_region(ptr, SIZEOF_VALUE, newobj_p);
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}
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#endif /* MJIT_HEADER */
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#endif /* INTERNAL_SANITIZERS_H */
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