mmap-cache: check if mmap protection mode is consistent when fd is already managed

Otherwise, MMapFileDescriptor with an unexpected protection mode may be returned.
2023-10-01 06:35:02 +09:00
parent 8926a6a467
commit 8ff0f36e00
1 changed files with 2 additions and 0 deletions
@@ -551,6 +551,8 @@ int mmap_cache_add_fd(MMapCache *m, int fd, int prot, MMapFileDescriptor **ret)

        existing = hashmap_get(m->fds, FD_TO_PTR(fd));
        if (existing) {
+                if (existing->prot != prot)
+                        return -EEXIST;
                if (ret)
                        *ret = existing;
                return 0;