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

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Avoid missing possible candidates due to the large address range of the free segment.
Eg, 

48000000-49400000 r-xs 08000000 00:0f 39322841               segment1
7ffff2ec8000-7ffff2f49000 rw-p 00000000 00:00 0              segment2
7ffff6fae000-7ffff735c000 r-xp 00200000 08:02 11538515       /usr/local/sbin/php-fpm

original code will miss the opportunity between [7ffff2ec** - 7ffff2ec8000].

Fix issue #11265.

Signed-off-by: Long, Tao <tao.long@intel.com>
Signed-off-by: Dmitry Stogov <dmitrystogov@gmail.com>
This commit is contained in:
LoongT4o 2023-05-23 19:49:19 +08:00 committed by GitHub
parent 24ff7eee3f
commit a2af8ac371
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 10 additions and 2 deletions
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12
ext/opcache/shared_alloc_mmap.c
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@ -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 */
@ -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 */