I am repasting here what I posted on the source code originally:
/*
* turns out path_umount backport is completely unneeded
* we copy the trick used on strncpy_from_unsafe_user / strncpy_from_user_nofault
* https://elixir.bootlin.com/linux/v4.4.302/source/mm/maccess.c#L184
* basically
*
* mm_segment_t old_fs = get_fs(); // remember original fs segment
* set_fs(USER_DS); // or KERNEL_DS *
* do_whatever_in_userspace();
* set_fs(old_fs); // restore fs segment
*
* * kernel -> user, KERNEL_DS, user -> kernel, USER_DS
*
* so yes, we can try to straight up call a syscall from kernel space
*
* NOTE: on newer kernels you can use force_uaccess_begin + force_uaccess_end
* ref: https://elixir.bootlin.com/linux/v5.10.237/source/mm/maccess.c#L250
*
*/
path_umount backport now optional — neat trick, werks, what can I say.
Backports? Nah, we’re good.
Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
On plain ARMv8.0 devices (A53,A57,A73), strncpy_from_user_nofault() sometimes
fails to copy `filename_user` string correctly. This breaks su ofc, breaking
some apps like Termux (Play Store ver), ZArchiver and Root Explorer.
This does NOT seem to affect newer ARMv8.2+ CPUs (A75/A76 and newer)
My speculation? ARMv8.0 has weak speculation :)
here we replace `strncpy_from_user_nofault()` with another routine:
- access_ok() to validate the pointer
- strncpy_from_user() to copy and validate string
- manual null-termination just in case, as strncpy_from_user_nofault also does it
- remove that memset, seems useless as it is an strncpy, not strncat
Kind of mimicking _nofault, but yes with this one we allow pagefaults.
Tested on:
- ARMv8.0 A73.a53, A57.a53, A53.a53
- ARMv8.2 A76.a55
Tested-by: iDead XD <rafifirdaus12bb@gmail.com>
Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.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
kernel/throne_tracker: we just uninstalled the manager, stop looking for it
When the manager UID disappears from packages.list, we correctly
invalidate it — good. But, in the very next breath, we start scanning
/data/app hoping to find it again?
Skip the scan — we’ll catch the reinstall next time packages.list updates.
Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
Signed-off-by: ShirkNeko <109797057+ShirkNeko@users.noreply.github.com>
disabling this removes the need for LSM_HOOK_INIT, security_add_hooks and such,.
furthermore, this will also allow easier integration on pre-4.1 kernels.
Expose this and make it a configurable option.
Signed-off-by: backslashxx <118538522+backslashxx@users.noreply.github.com>
`thread_pid` is not defined in kernel 4.14 and lower, leading to compilation issue.
To fix this, use `pids[PIDTYPE_PID].pid` for kernel versions 4.14 and lower.
Else use `thread_pid` for kernel versions 4.19 and higher.
Reference: 107717913b/tracee/tracee.bpf.c (L354)
* Some samsung kernel source have SEC_SELINUX_PORTING_COMMON
* This commit mayfix false warning to sepolicy.
Mayfix: I haven't test it yet
Signed-off-by: rsuntk <90097027+rsuntk@users.noreply.github.com>
