diff options
Diffstat (limited to 'kernel/futex/core.c')
| -rw-r--r-- | kernel/futex/core.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/futex/core.c b/kernel/futex/core.c index 764e73622b38..d42245170a7a 100644 --- a/kernel/futex/core.c +++ b/kernel/futex/core.c @@ -570,7 +570,17 @@ 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; } |