kernel & KernelSU: More Optimization on SUS_MOUNT and AUTO_ADD_TRY_UMOUNT_FOR_BIND_MOUNT; Dropped HAS_MAGIC_MOUNT feature in Kconfig
- In order to stop more performance loss, the changes here is not to monitor any ksu mounts anymore during/after boot-completed stage,
since monitoring the free of mnt_id and reordering the mnt_id takes some CPU cycles already.
- HAS_MAGIC_MOUNT is not needed anymore and catching magic mounts can be simplifed by checking whether
1. It is bind mount
2. Its mnt_devname is "KSU"
3. It is a directory
4. mounted path begins with "/debug_ramdisk/workdir/"
- Some sus bind mounts still cannot be catched with these changes, like revanced youtube module,
since it bind mounts after the user data is decrypted, at this point user may need to manually
add the mounted path to try_umount.
Co-authored-by: simonpunk <simonpunk2016@gmail.com>
Run throne_tracker() in kthread instead of blocking the caller.
Prevents full lockup during installation and removing the manager.
By default, first run remains synchronous for compatibility purposes
(FDE, FBEv1, FBEv2)
Features:
- looks and waits for manager UID in /data/system/packages.list
- run track_throne() in a kthread after the first synchronous run
- prevent duplicate thread creation with a single-instance check
- spinlock-on-d_lock based polling adressing possible race conditions.
Race conditions adressed
- single instance kthread lock, smp_mb()
- track_throne_function, packages.list, spinlock-on-d_lock based polling
- is_manager_apk, apk, spinlock-on-d_lock based polling
This is a squash of:
https://github.com/tiann/KernelSU/pull/2632
Original skeleton based on:
`kernelsu: move throne_tracker() to kthread`
`kernelsu: check locking before accessing files and dirs during searching manager`
`kernelsu: look for manager UID in /data/system/packages.list, not /data/system/packages.list.tmp`
0b05e927...8783badd
Co-Authored-By: backslashxx <118538522+backslashxx@users.noreply.github.com>
Co-Authored-By: Yaroslav Zviezda <10716792+acroreiser@users.noreply.github.com>
Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
- In order to reduce the extra patch code and increase the rate of hunk succeed, we do not rename the symbols in KernelSU drvier but instead do it all in kernel/kallsym.c
- Make susfs_starts_with() global as it maybe useful in future
Co-authored-by: simonpunk <simonpunk2016@gmail.com>
Tracepoint is a predefined hook point in the kernel, compared to Kprobe,
it is more stable and has lower performance overhead, although compatibility
is relatively poor, it is still worth trying
By the way, we have also included the config definitions related to hook types
in Kconfig, to enhance cleanliness
These patches is based on https://github.com/backslashxx/KernelSU/issues/5
Co-authored-by: Cloud_Yun <1770669041@qq.com>
Co-authored-by: Prslc <prslc113@gmail.com>
kernel & KernelSU: Replace kabi member susfs_task_state of tast_struct and use tast_struct->thread_info.flags instead; Fix for sus_path not working on some OEM devices; KSU_SUSFS requires CONFIG_THREAD_INFO_IN_TASK now;
- Since the kabi member is not guaranteed to be unused by OEM, that is why some deivces may conflict with the kabi member added by susfs, we should use less kabi member as much as possible.
- Luckily we have task_struct->thread_info that is enabled by all gki kernels just like kprobes, so we can utilize thread_info->flags for faster check, but it needs CONFIG_THREAD_INFO_IN_TASK to be on which should always be enabled
- Big thanks to fatalcoder524 (https://github.com/fatalcoder524) who did an excellent debug process for me
Co-authored-by: simonpunk <simonpunk2016@gmail.com>
Revise the explanation for KSU_MULTI_MANAGER_SUPPORT
Change-Id: I097b4e0d1a30c02fadd75d4123c7bcf346782f18
Signed-off-by: WenHao2130 <wenhao2130@outlook.com>
- We don't know if KPM can run on arm32-bit devices, so to avoid some problems, add a dependency on 64-bit architectures
Signed-off-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>
