hardened_malloc_rs/
bindings.rs

1use core::ffi::{c_int, c_void};
2
3// ideally we would use c_size_t but it's unstable
4
5#[allow(dead_code)]
6extern "C" {
7	/* C standard */
8	pub fn malloc(size: usize) -> *mut c_void;
9	pub fn calloc(nmemb: usize, size: usize) -> *mut c_void;
10	pub fn realloc(ptr: *mut c_void, size: usize) -> *mut c_void;
11	pub fn aligned_alloc(alignment: usize, size: usize) -> *mut c_void;
12	pub fn free(ptr: *mut c_void);
13
14	/* POSIX */
15	pub fn posix_memalign(memptr: *mut *mut c_void, alignment: usize, size: usize) -> c_int;
16
17	/* glibc extensions */
18	#[cfg(target_os = "android")]
19	pub fn malloc_usable_size(ptr: *const c_void) -> usize;
20	#[cfg(not(target_os = "android"))]
21	pub fn malloc_usable_size(ptr: *mut c_void) -> usize;
22	pub fn mallopt(param: c_int, value: c_int) -> c_int;
23	pub fn malloc_trim(pad: usize) -> c_int;
24	pub fn malloc_stats() -> c_void;
25
26	/* TODO: add support for these
27		#if defined(__GLIBC__) || defined(__ANDROID__)
28	struct mallinfo h_mallinfo(void);
29	#endif
30	#ifndef __ANDROID__
31	int h_malloc_info(int options, FILE *fp);
32	#endif
33	*/
34
35	/* obsolete glbc extensions */
36	pub fn memalign(alignment: usize, size: usize) -> *mut c_void;
37	#[cfg(not(target_os = "android"))]
38	pub fn valloc(size: usize) -> *mut c_void;
39	#[cfg(not(target_os = "android"))]
40	pub fn pvalloc(size: usize) -> *mut c_void;
41	pub fn cfree(ptr: *mut c_void) -> c_void;
42	pub fn malloc_get_state() -> *mut c_void;
43	pub fn malloc_set_state(state: *mut c_void) -> c_int;
44
45	/* TODO: add support for these android extensions
46		// Android extensions
47	#ifdef __ANDROID__
48	size_t h_mallinfo_narenas(void);
49	size_t h_mallinfo_nbins(void);
50	struct mallinfo h_mallinfo_arena_info(size_t arena);
51	struct mallinfo h_mallinfo_bin_info(size_t arena, size_t bin);
52	int h_malloc_iterate(uintptr_t base, size_t size, void (*callback)(uintptr_t ptr, size_t size, void *arg),
53				  void *arg);
54	void h_malloc_disable(void);
55	void h_malloc_enable(void);
56	void h_malloc_disable_memory_tagging(void);
57	#endif */
58
59	/* hardened_malloc extensions */
60	/// return an upper bound on object size for any pointer based on malloc
61	/// metadata
62	pub fn malloc_object_size(ptr: *const c_void) -> usize;
63
64	/// similar to malloc_object_size, but avoiding locking so the results are
65	/// much more limited
66	pub fn malloc_object_size_fast(ptr: *const c_void) -> usize;
67
68	/// The free function with an extra parameter for passing the size requested
69	/// at allocation time.
70	///
71	/// This offers the same functionality as C++14 sized deallocation and can
72	/// be used to implement it.
73	///
74	/// A performance-oriented allocator would use this as a performance
75	/// enhancement with undefined behavior on a mismatch. Instead, this
76	/// hardened allocator implementation uses it to improve security by
77	/// checking that the passed size matches the allocated size.
78	pub fn free_sized(ptr: *mut c_void, expected_size: usize) -> c_void;
79}
hardened_malloc_rs/bindings.rs

hardened_malloc_rs/
bindings.rs
