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Lines 40-46
static int sb_munmap(void *addr, size_t length)
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#define SB_MALLOC_TO_MMAP(ptr) ((void*)((uintptr_t)(ptr) - MIN_ALIGN)) |
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#define SB_MALLOC_TO_MMAP(ptr) ((void*)((uintptr_t)(ptr) - MIN_ALIGN)) |
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#define SB_MMAP_TO_MALLOC(ptr) ((void*)((uintptr_t)(ptr) + MIN_ALIGN)) |
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#define SB_MMAP_TO_MALLOC(ptr) ((void*)((uintptr_t)(ptr) + MIN_ALIGN)) |
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#define SB_MALLOC_TO_SIZE(ptr) (*((size_t*)SB_MALLOC_TO_MMAP(ptr))) |
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#define SB_MALLOC_TO_MMAP_SIZE(ptr) (*((size_t*)SB_MALLOC_TO_MMAP(ptr))) |
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void *malloc(size_t size) |
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void *malloc(size_t size) |
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{ |
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{ |
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Lines 57-63
void free(void *ptr)
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{ |
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{ |
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if (ptr == NULL) |
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if (ptr == NULL) |
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return; |
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return; |
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if (munmap(SB_MALLOC_TO_MMAP(ptr), SB_MALLOC_TO_SIZE(ptr))) |
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if (munmap(SB_MALLOC_TO_MMAP(ptr), SB_MALLOC_TO_MMAP_SIZE(ptr))) |
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sb_ebort("sandbox memory corruption with free(%p): %s\n", |
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sb_ebort("sandbox memory corruption with free(%p): %s\n", |
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ptr, strerror(errno)); |
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ptr, strerror(errno)); |
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} |
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} |
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Lines 83-89
void *realloc(void *ptr, size_t size)
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return ptr; |
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return ptr; |
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} |
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} |
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old_malloc_size = SB_MALLOC_TO_SIZE(ptr); |
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old_malloc_size = SB_MALLOC_TO_MMAP_SIZE(ptr) - MIN_ALIGN; |
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/* Since mmap() is heavy, don't bother shrinking */ |
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/* Since mmap() is heavy, don't bother shrinking */ |
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if (size <= old_malloc_size) |
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if (size <= old_malloc_size) |
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return ptr; |
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return ptr; |
