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Support fixed address mmap without replacement

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Reapply changes for Zend fixed mapping but only for FreeBSD.
Other BSD might expose some day a similar flag (private
for OpenBSD for the moment for example).
The Linux's part could be brought back but not before 7.4,
at this time, distributions with kernel > 4.17 will be
more widely available.
This commit is contained in:
David Carlier 2018-08-29 21:04:32 +01:00 committed by Nikita Popov
parent 6c376996cf
commit f7b573b4e9
1 changed files with 6 additions and 2 deletions
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8
Zend/zend_alloc.c
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@ -423,11 +423,15 @@ static void *zend_mm_mmap_fixed(void *addr, size_t size)
#ifdef _WIN32
return VirtualAlloc(addr, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
#else
int flags = MAP_PRIVATE | MAP_ANON;
#if defined(MAP_EXCL)
flags |= MAP_FIXED | MAP_EXCL;
#endif
/* MAP_FIXED leads to discarding of the old mapping, so it can't be used. */
void *ptr = mmap(addr, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON /*| MAP_POPULATE | MAP_HUGETLB*/, -1, 0);
void *ptr = mmap(addr, size, PROT_READ | PROT_WRITE, flags /*| MAP_POPULATE | MAP_HUGETLB*/, -1, 0);
if (ptr == MAP_FAILED) {
#if ZEND_MM_ERROR
#if ZEND_MM_ERROR && !defined(MAP_EXCL)
fprintf(stderr, "\nmmap() failed: [%d] %s\n", errno, strerror(errno));
#endif
return NULL;