diff options
Diffstat (limited to 'fs/userfaultfd.c')
| -rw-r--r-- | fs/userfaultfd.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/fs/userfaultfd.c b/fs/userfaultfd.c index de86f5b2859f..1c44bf75f916 100644 --- a/fs/userfaultfd.c +++ b/fs/userfaultfd.c @@ -1925,10 +1925,8 @@ static int userfaultfd_api(struct userfaultfd_ctx *ctx, ret = -EFAULT; if (copy_from_user(&uffdio_api, buf, sizeof(uffdio_api))) goto out; - features = uffdio_api.features; - ret = -EINVAL; - if (uffdio_api.api != UFFD_API || (features & ~UFFD_API_FEATURES)) - goto err_out; + /* Ignore unsupported features (userspace built against newer kernel) */ + features = uffdio_api.features & UFFD_API_FEATURES; ret = -EPERM; if ((features & UFFD_FEATURE_EVENT_FORK) && !capable(CAP_SYS_PTRACE)) goto err_out; |