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shmget() with IPC_CREAT must not create 0 size SHM

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The recently committed fix for GH-9944 did only indirectly cater to
that, namely because in this case `CreateFileMapping()` with a zero
size couldn't be created.  As of PHP 8.2.0, the mappings of the actual
SHM and the info segment have been merged, so creating a zero size SHM
would be possible unless we explicitly prohibit this.
This commit is contained in:
Christoph M. Becker
2022-12-13 19:38:45 +01:00
parent 9089e15940
commit 4631e9de2b
1 changed files with 1 additions and 1 deletions
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2
TSRM/tsrm_win32.c
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@@ -645,7 +645,7 @@ TSRM_API int shmget(key_t key, size_t size, int flags)
if (!shm_handle) {
if (flags & IPC_CREAT) {
if (size > SIZE_MAX - sizeof(shm->descriptor)) {
if (size == 0 || size > SIZE_MAX - sizeof(shm->descriptor)) {
return -1;
}
size += sizeof(shm->descriptor);