diff --git a/kernel/futex/core.c b/kernel/futex/core.c index 78cc66bca..1bd5fb20c 100755 --- a/kernel/futex/core.c +++ b/kernel/futex/core.c @@ -515,7 +515,17 @@ static int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key, * but access_ok() should be faster than find_vma() */ if (!fshared) { - key->private.mm = mm; + /* + * On no-MMU, shared futexes are treated as private, therefore + * we must not include the current process in the key. Since + * there is only one address space, the address is a unique key + * on its own. + */ + if (IS_ENABLED(CONFIG_MMU)) + key->private.mm = mm; + else + key->private.mm = NULL; + key->private.address = address; return 0; }