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Fix the JIT buffer relocation failure at the corner case #11266

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merged 1 commit into from
May 23, 2023
Merged

Fix the JIT buffer relocation failure at the corner case #11266

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12 changes: 10 additions & 2 deletions ext/opcache/shared_alloc_mmap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -67,8 +67,13 @@ static void *find_prefered_mmap_base(size_t requested_size)
while (fgets(buffer, MAXPATHLEN, f) && sscanf(buffer, "%lx-%lx", &start, &end) == 2) {
if ((uintptr_t)execute_ex >= start) {
/* the current segment lays before PHP .text segment or PHP .text segment itself */
/*Search for candidates at the end of the free segment near the .text segment
to prevent candidates from being missed due to large hole*/
if (last_free_addr + requested_size <= start) {
last_candidate = last_free_addr;
last_candidate = ZEND_MM_ALIGNED_SIZE_EX(start - requested_size, huge_page_size);
if (last_candidate + requested_size > start) {
last_candidate -= huge_page_size;
}
}
if ((uintptr_t)execute_ex < end) {
/* the current segment is PHP .text segment itself */
Expand Down Expand Up @@ -117,7 +122,10 @@ static void *find_prefered_mmap_base(size_t requested_size)
if ((uintptr_t)execute_ex >= e_start) {
/* the current segment lays before PHP .text segment or PHP .text segment itself */
if (last_free_addr + requested_size <= e_start) {
last_candidate = last_free_addr;
last_candidate = ZEND_MM_ALIGNED_SIZE_EX(e_start - requested_size, huge_page_size);
if (last_candidate + requested_size > e_start) {
last_candidate -= huge_page_size;
}
}
if ((uintptr_t)execute_ex < e_end) {
/* the current segment is PHP .text segment itself */
Expand Down