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mmap: Check if size exceeds available memory when MAP_HUGETLB

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If size exceeds, mmap fails and set -ENOMEM

Change-Id: I4f0d6e18ee3a7c8e32e251b7ed07ee9f76305603
Refs: #1183
This commit is contained in:
Ken Sato
2019-07-02 15:42:13 +09:00
committed by Masamichi Takagi
parent 2dd8687974
commit 8efced7bf7
11 changed files with 542 additions and 0 deletions
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17
kernel/include/rusage_private.h
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@ -301,6 +301,23 @@ rusage_check_oom(int numa_id, unsigned long pages, int is_user)
return 0;
}
static inline int
rusage_check_overmap(size_t len, int pgshift)
{
int npages = 0, remain_pages = 0;
npages = (len + (1UL << pgshift) - 1) >> pgshift;
remain_pages = (rusage.total_memory - rusage.total_memory_usage)
>> pgshift;
if (npages > remain_pages) {
/* overmap */
return 1;
}
return 0;
}
static inline void
rusage_page_add(int numa_id, unsigned long pages, int is_user)
{