| ### Unreleased |
| |
| - Added `Uffd::read_events` that can read multiple events from the userfaultfd file descriptor. |
| - Updated `bitflags` dependency to `2.2.1`. |
| - Use `/dev/userfaultfd` as the default API for creating userfaultfd file descriptors. |
| |
| Since Linux 5.11 a process can select if it wants to handle page faults triggered in kernel space |
| or not. Under this mechanism, processes that wish to handle those, need to have `CAP_SYS_PTRACE` |
| capability. `CAP_SYS_PTRACE` allows a process to do much more than create userfault fds, so with |
| 6.1 Linux introduces `/dev/userfaultfd`, a special character device that allows creating |
| userfault file descriptors using the `USERFAULTFD_IOC_NEW` `ioctl`. Access to this device is |
| granted via file system permissions and does not require `CAP_SYS_PTRACE` to handle kernel |
| triggered page faults. |
| |
| We now default to using `/dev/userfaultfd` for creating the descriptors and only if that file is |
| not present, we fall back to using the syscall. |
| |
| ### 0.3.1 (2021-02-17) |
| |
| - Added support for the `UFFD_FEATURE_THREAD_ID` flag when compiled with the `linux4_14` Cargo |
| feature. |
| |
| ### 0.3.0 (2021-02-03) |
| |
| - Update `bindgen` dependency of `userfaultfd-sys` to `0.57`. Thank you @jgowans |
| |
| ### 0.2.1 (2020-11-20) |
| |
| - Make `ReadWrite` public. Thank you @electroCutie |
| |
| ### 0.2.0 (2020-04-10) |
| |
| - Removed the compile-time Linux version check, and replaced it with a Cargo feature. |
| |
| The Linux version check was overly restrictive, even on systems that did have the right kernel |
| version installed but had older headers in `/usr/include/linux`. Beyond that, this check made it |
| more difficult to compile on a different host than what's targeted. |
| |
| There is now a `linux4_14` feature flag on `userfaultfd-sys`, which turns on and tests the extra |
| constants available in that version. Since `userfaultfd` did not make use of any of those newer |
| features, it doesn't have a feature flag yet. |
| |
| Applications should take care when initializing with `UffdBuilder` to specify the features and |
| ioctls they require, so that an unsupported version will be detected at runtime. |
| |
| |
| ### 0.1.0 (2020-04-07) |
| |
| - Initial public release of userfaultfd-rs. |
