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      1 #ifndef JEMALLOC_INTERNAL_SAN_BUMP_H
      2 #define JEMALLOC_INTERNAL_SAN_BUMP_H
      3 
      4 #include "jemalloc/internal/edata.h"
      5 #include "jemalloc/internal/exp_grow.h"
      6 #include "jemalloc/internal/mutex.h"
      7 
      8 #define SBA_RETAINED_ALLOC_SIZE ((size_t)4 << 20)
      9 
     10 extern bool opt_retain;
     11 
     12 typedef struct ehooks_s ehooks_t;
     13 typedef struct pac_s pac_t;
     14 
     15 typedef struct san_bump_alloc_s san_bump_alloc_t;
     16 struct san_bump_alloc_s {
     17 	malloc_mutex_t mtx;
     18 
     19 	edata_t *curr_reg;
     20 };
     21 
     22 static inline bool
     23 san_bump_enabled(void) {
     24 	/*
     25 	 * We enable san_bump allocator only when it's possible to break up a
     26 	 * mapping and unmap a part of it (maps_coalesce). This is needed to
     27 	 * ensure the arena destruction process can destroy all retained guarded
     28 	 * extents one by one and to unmap a trailing part of a retained guarded
     29 	 * region when it's too small to fit a pending allocation.
     30 	 * opt_retain is required, because this allocator retains a large
     31 	 * virtual memory mapping and returns smaller parts of it.
     32 	 */
     33 	return maps_coalesce && opt_retain;
     34 }
     35 
     36 static inline bool
     37 san_bump_alloc_init(san_bump_alloc_t* sba) {
     38 	bool err = malloc_mutex_init(&sba->mtx, "sanitizer_bump_allocator",
     39 	    WITNESS_RANK_SAN_BUMP_ALLOC, malloc_mutex_rank_exclusive);
     40 	if (err) {
     41 		return true;
     42 	}
     43 	sba->curr_reg = NULL;
     44 
     45 	return false;
     46 }
     47 
     48 edata_t *
     49 san_bump_alloc(tsdn_t *tsdn, san_bump_alloc_t* sba, pac_t *pac, ehooks_t *ehooks,
     50     size_t size, bool zero);
     51 
     52 #endif /* JEMALLOC_INTERNAL_SAN_BUMP_H */
     53