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initial working guarded pages

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daanx 2024-08-19 21:21:40 -07:00
parent 7b5df14bea
commit 0c19eb60cf
12 changed files with 196 additions and 37 deletions
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10
include/mimalloc/internal.h
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@ -323,6 +323,7 @@ static inline uintptr_t _mi_align_up(uintptr_t sz, size_t alignment) {
}
}
// Align a pointer upwards
static inline void* mi_align_up_ptr(void* p, size_t alignment) {
return (void*)_mi_align_up((uintptr_t)p, alignment);
@ -594,6 +595,15 @@ static inline void mi_page_set_has_aligned(mi_page_t* page, bool has_aligned) {
page->flags.x.has_aligned = has_aligned;
}
#if MI_DEBUG_GUARDED
static inline bool mi_page_has_guarded(const mi_page_t* page) {
return page->flags.x.has_guarded;
}
static inline void mi_page_set_has_guarded(mi_page_t* page, bool has_guarded) {
page->flags.x.has_guarded = has_guarded;
}
#endif
/* -------------------------------------------------------------------
Encoding/Decoding the free list next pointers

10
include/mimalloc/types.h
View file

@ -72,6 +72,12 @@ terms of the MIT license. A copy of the license can be found in the file
#endif
#endif
// Use guard pages behind objects of a certain size
#define MI_DEBUG_GUARDED 1
#if defined(MI_DEBUG_GUARDED) || defined(MI_DEBUG_GUARDEDX)
#define MI_PADDING 0
#endif
// Reserve extra padding at the end of each block to be more resilient against heap block overflows.
// The padding can detect buffer overflow on free.
#if !defined(MI_PADDING) && (MI_SECURE>=3 || MI_DEBUG>=1 || (MI_TRACK_VALGRIND || MI_TRACK_ASAN || MI_TRACK_ETW))
@ -243,15 +249,17 @@ typedef union mi_page_flags_s {
struct {
uint8_t in_full : 1;
uint8_t has_aligned : 1;
uint8_t has_guarded : 1; // only used with MI_DEBUG_GUARDED
} x;
} mi_page_flags_t;
#else
// under thread sanitizer, use a byte for each flag to suppress warning, issue #130
typedef union mi_page_flags_s {
uint16_t full_aligned;
uint32_t full_aligned;
struct {
uint8_t in_full;
uint8_t has_aligned;
uint8_t has_guarded; // only used with MI_DEBUG_GUARDED
} x;
} mi_page_flags_t;
#endif