mirror of
https://github.com/frida/tinycc
synced 2024-12-29 16:19:40 +03:00
use malloc hooks to properly catch all mallocs
This commit is contained in:
bellard
parent
9eab1030f7
commit
ad28d4c5b0
168
bcheck.c
168
bcheck.c
@ -56,17 +56,29 @@ void __bound_init(void);
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void __bound_new_region(void *p, unsigned long size);
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void __bound_delete_region(void *p);
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/* currently, tcc cannot compile that because we use GNUC extensions */
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#if !defined(__TINYC__)
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void *__bound_ptr_add(void *p, int offset) __attribute__((regparm(2)));
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char __bound_ptr_indir_b(void *p, int offset) __attribute__((regparm(2)));
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unsigned char __bound_ptr_indir_ub(void *p, int offset) __attribute__((regparm(2)));
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short __bound_ptr_indir_w(void *p, int offset) __attribute__((regparm(2)));
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unsigned short __bound_ptr_indir_uw(void *p, int offset) __attribute__((regparm(2)));
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int __bound_ptr_indir_i(void *p, int offset) __attribute((regparm(2)));
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#endif
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void *__bound_calloc(size_t nmemb, size_t size);
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void *__bound_malloc(size_t size);
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void __bound_free(void *ptr);
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void *__bound_realloc(void *ptr, size_t size);
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void *__bound_malloc(size_t size, const void *caller);
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void *__bound_memalign(size_t size, size_t align, const void *caller);
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void __bound_free(void *ptr, const void *caller);
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void *__bound_realloc(void *ptr, size_t size, const void *caller);
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static void *libc_malloc(size_t size);
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static void libc_free(void *ptr);
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static void install_malloc_hooks(void);
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static void restore_malloc_hooks(void);
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static void *saved_malloc_hook;
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static void *saved_free_hook;
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static void *saved_realloc_hook;
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static void *saved_memalign_hook;
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extern char _end;
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@ -122,12 +134,15 @@ static void bound_alloc_error(void)
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bound_error("not enough memory for bound checking code\n");
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}
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/* currently, tcc cannot compile that because we use GNUC extensions */
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#if !defined(__TINYC__)
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/* do: return (p + offset); */
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void *__bound_ptr_add(void *p, int offset)
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{
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unsigned long addr = (unsigned long)p;
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BoundEntry *e;
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#ifdef BOUND_DEBUG
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#if defined(BOUND_DEBUG)
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printf("add: 0x%x %d\n", (int)p, offset);
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#endif
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@ -168,6 +183,21 @@ type __bound_ptr_indir_ ## suffix (void *p, int offset) \
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return *(type *)(p + offset); \
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}
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#else
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void *__bound_ptr_add(void *p, int offset)
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{
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return p + offset;
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}
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#define BOUND_PTR_INDIR(suffix, type) \
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type __bound_ptr_indir_ ## suffix (void *p, int offset) \
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{ \
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return *(type *)(p + offset); \
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}
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#endif
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BOUND_PTR_INDIR(b, char)
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BOUND_PTR_INDIR(ub, unsigned char)
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BOUND_PTR_INDIR(w, short)
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@ -179,7 +209,7 @@ static BoundEntry *__bound_new_page(void)
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BoundEntry *page;
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int i;
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page = malloc(sizeof(BoundEntry) * BOUND_T2_SIZE);
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page = libc_malloc(sizeof(BoundEntry) * BOUND_T2_SIZE);
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if (!page)
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bound_alloc_error();
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for(i=0;i<BOUND_T2_SIZE;i++) {
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@ -196,13 +226,13 @@ static BoundEntry *__bound_new_page(void)
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static BoundEntry *bound_new_entry(void)
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{
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BoundEntry *e;
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e = malloc(sizeof(BoundEntry));
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e = libc_malloc(sizeof(BoundEntry));
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return e;
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}
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static void bound_free_entry(BoundEntry *e)
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{
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free(e);
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libc_free(e);
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}
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static inline BoundEntry *get_page(int index)
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@ -233,7 +263,9 @@ static void mark_invalid(unsigned long addr, unsigned long size)
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else
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t2_end = 1 << (BOUND_T1_BITS + BOUND_T2_BITS);
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#if 0
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printf("mark_invalid: start = %x %x\n", t2_start, t2_end);
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#endif
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/* first we handle full pages */
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t1_start = (t2_start + BOUND_T2_SIZE - 1) >> BOUND_T2_BITS;
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@ -275,8 +307,11 @@ void __bound_init(void)
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BoundEntry *page;
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unsigned long start, size;
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/* save malloc hooks and install bound check hooks */
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install_malloc_hooks();
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#ifndef BOUND_STATIC
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__bound_t1 = malloc(BOUND_T1_SIZE * sizeof(BoundEntry *));
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__bound_t1 = libc_malloc(BOUND_T1_SIZE * sizeof(BoundEntry *));
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if (!__bound_t1)
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bound_alloc_error();
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#endif
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@ -300,10 +335,12 @@ void __bound_init(void)
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size = BOUND_T23_SIZE;
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mark_invalid(start, size);
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#if !defined(__TINYC__)
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/* malloc zone is also marked invalid */
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start = (unsigned long)&_end;
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size = 128 * 0x100000;
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mark_invalid(start, size);
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#endif
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}
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static inline void add_region(BoundEntry *e,
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@ -453,7 +490,7 @@ void __bound_delete_region(void *p)
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e = __bound_find_region(e, p);
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/* test if invalid region */
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if (e->size == EMPTY_SIZE || (unsigned long)p != e->start)
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bound_error("deleting invalid region");
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bound_error("freeing invalid region");
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/* compute the size we put in invalid regions */
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if (e->is_invalid)
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empty_size = INVALID_SIZE;
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@ -529,62 +566,109 @@ static unsigned long get_region_size(void *p)
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/* patched memory functions */
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static void install_malloc_hooks(void)
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{
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saved_malloc_hook = __malloc_hook;
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saved_free_hook = __free_hook;
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saved_realloc_hook = __realloc_hook;
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saved_memalign_hook = __memalign_hook;
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__malloc_hook = __bound_malloc;
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__free_hook = __bound_free;
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__realloc_hook = __bound_realloc;
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__memalign_hook = __bound_memalign;
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}
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static void restore_malloc_hooks(void)
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{
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__malloc_hook = saved_malloc_hook;
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__free_hook = saved_free_hook;
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__realloc_hook = saved_realloc_hook;
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__memalign_hook = saved_memalign_hook;
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}
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static void *libc_malloc(size_t size)
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{
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void *ptr;
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restore_malloc_hooks();
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ptr = malloc(size);
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install_malloc_hooks();
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return ptr;
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}
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static void libc_free(void *ptr)
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{
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restore_malloc_hooks();
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free(ptr);
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install_malloc_hooks();
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}
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/* XXX: we should use a malloc which ensure that it is unlikely that
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two malloc'ed data have the same address if 'free' are made in
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between. */
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void *__bound_malloc(size_t size)
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void *__bound_malloc(size_t size, const void *caller)
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{
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void *ptr;
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/* we allocate one more byte to ensure the regions will be
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separated by at least one byte. With the glibc malloc, it may
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be in fact not necessary */
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ptr = malloc(size + 1);
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ptr = libc_malloc(size + 1);
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if (!ptr)
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return NULL;
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__bound_new_region(ptr, size);
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return ptr;
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}
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void __bound_free(void *ptr)
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void *__bound_memalign(size_t size, size_t align, const void *caller)
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{
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void *ptr;
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restore_malloc_hooks();
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/* we allocate one more byte to ensure the regions will be
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separated by at least one byte. With the glibc malloc, it may
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be in fact not necessary */
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ptr = memalign(size + 1, align);
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install_malloc_hooks();
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if (!ptr)
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return NULL;
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__bound_new_region(ptr, size);
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return ptr;
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}
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void __bound_free(void *ptr, const void *caller)
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{
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if (ptr == NULL)
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return;
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__bound_delete_region(ptr);
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free(ptr);
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libc_free(ptr);
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}
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void *__bound_realloc(void *ptr, size_t size)
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void *__bound_realloc(void *ptr, size_t size, const void *caller)
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{
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void *ptr1;
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int old_size;
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if (size == 0) {
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__bound_free(ptr);
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__bound_free(ptr, caller);
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return NULL;
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} else {
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ptr1 = __bound_malloc(size);
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ptr1 = __bound_malloc(size, caller);
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if (ptr == NULL || ptr1 == NULL)
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return ptr1;
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old_size = get_region_size(ptr);
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if (old_size == EMPTY_SIZE)
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bound_error("realloc'ing invalid pointer");
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memcpy(ptr1, ptr, old_size);
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__bound_free(ptr);
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__bound_free(ptr, caller);
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return ptr1;
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}
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}
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void *__bound_calloc(size_t nmemb, size_t size)
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{
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void *ptr;
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size = size * nmemb;
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ptr = __bound_malloc(size);
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if (!ptr)
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return NULL;
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memset(ptr, 0, size);
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return ptr;
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}
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#if 0
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static void bound_dump(void)
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{
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@ -611,3 +695,29 @@ static void bound_dump(void)
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}
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}
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#endif
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#if 0
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/* resolve check check syms */
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typedef struct BCSyms {
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char *str;
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void *ptr;
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} BCSyms;
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static BCSyms bcheck_syms[] = {
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{ NULL, NULL },
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};
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#endif
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static void *bound_resolve_sym(const char *sym)
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{
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#if 0
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BCSyms *p;
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p = bcheck_syms;
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while (p->str != NULL) {
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if (!strcmp(p->str, sym))
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return p->ptr;
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p++;
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}
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#endif
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return NULL;
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}
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