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use physical memory in kib to avoid overflow of size_t (issue #1010)

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daanx 2025-02-11 09:12:29 -08:00
parent 78dd3f0e38
commit ec4aa62b65
4 changed files with 18 additions and 18 deletions
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2
include/mimalloc/prim.h
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@ -25,7 +25,7 @@ typedef struct mi_os_mem_config_s {
size_t page_size; // default to 4KiB
size_t large_page_size; // 0 if not supported, usually 2MiB (4MiB on Windows)
size_t alloc_granularity; // smallest allocation size (usually 4KiB, on Windows 64KiB)
size_t physical_memory; // physical memory size
size_t physical_memory_in_kib; // physical memory size in KiB
size_t virtual_address_bits; // usually 48 or 56 bits on 64-bit systems. (used to determine secure randomization)
bool has_overcommit; // can we reserve more memory than can be actually committed?
bool has_partial_free; // can allocated blocks be freed partially? (true for mmap, false for VirtualAlloc)

8
src/os.c
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@ -24,11 +24,11 @@ terms of the MIT license. A copy of the license can be found in the file
#endif
#endif
#ifndef MI_DEFAULT_PHYSICAL_MEMORY
#ifndef MI_DEFAULT_PHYSICAL_MEMORY_IN_KIB
#if MI_INTPTR_SIZE < 8
#define MI_DEFAULT_PHYSICAL_MEMORY 4*MI_GiB
#define MI_DEFAULT_PHYSICAL_MEMORY_IN_KIB 4*MI_MiB // 4 GiB
#else
#define MI_DEFAULT_PHYSICAL_MEMORY 32*MI_GiB
#define MI_DEFAULT_PHYSICAL_MEMORY_IN_KIB 32*MI_MiB // 32 GiB
#endif
#endif
@ -36,7 +36,7 @@ static mi_os_mem_config_t mi_os_mem_config = {
4096, // page size
0, // large page size (usually 2MiB)
4096, // allocation granularity
MI_DEFAULT_PHYSICAL_MEMORY,
MI_DEFAULT_PHYSICAL_MEMORY_IN_KIB,
MI_DEFAULT_VIRTUAL_ADDRESS_BITS,
true, // has overcommit? (if true we use MAP_NORESERVE on mmap systems)
false, // can we partially free allocated blocks? (on mmap systems we can free anywhere in a mapped range, but on Windows we must free the entire span)

2
src/prim/unix/prim.c
View file

@ -143,7 +143,7 @@ void _mi_prim_mem_init( mi_os_mem_config_t* config )
#if defined(_SC_PHYS_PAGES)
long pphys = sysconf(_SC_PHYS_PAGES);
if (pphys > 0 && (size_t)pphys < (SIZE_MAX/(size_t)psize)) {
config->physical_memory = (size_t)pphys * (size_t)psize;
config->physical_memory_in_kib = (size_t)pphys * ((size_t)psize / MI_KiB);
}
#endif
}

2
src/prim/windows/prim.c
View file

@ -155,7 +155,7 @@ void _mi_prim_mem_init( mi_os_mem_config_t* config )
ULONGLONG memInKiB = 0;
if ((*pGetPhysicallyInstalledSystemMemory)(&memInKiB)) {
if (memInKiB > 0 && memInKiB < (SIZE_MAX / MI_KiB)) {
config->physical_memory = (size_t)memInKiB * MI_KiB;
config->physical_memory_in_kib = memInKiB;
}
}
}