[PATCH v4 0/3] binder: handle PID namespace conversion for freeze operation

[jongan . kim]

From: JongAn Kim <jongan.kim@xxxxxxx>

This patch series fixes PID namespace handling in binder's freeze operation
for both C and Rust implementations.

Changes in v4

1. Patch 1/3
- change subject name more clearly
- comapre task_struct pointers directly instead of PID.

2. Patch 2/3
- Add __rust_helper annotation to rust_helper_get_pid

3. Patch 3/3
- change subject name more clearly
- Use Task pointer comparison instead of PID number comparison (Gary, Alice)
- Remove PidNamespace dependency entirely
- Use &mut KVec parameter to avoid intermediate allocation (Gary)
- Merge context.rs and process.rs changes into single patch

History

v1 : https://lore.kernel.org/lkml/20251203024140.175952-1-jongan.kim@xxxxxxx/T/#u

v2 : https://lore.kernel.org/lkml/20260129084119.32994-1-jongan.kim@xxxxxxx/T/#u
- add two more patches to implement the same logic in Rust binder

v3 : https://lore.kernel.org/lkml/20260203065928.4736-2-jongan.kim@xxxxxxx/

Test
- basic binder freeze test : OK
- binder freeze collision test in seperated namespace : OK

HeeSu Kim (2):
  rust: pid: add Pid abstraction and init_ns helper
  rust_binder: handle PID namespace conversion for freeze operation

JongAn Kim (1):
  binder: handle PID namespace conversion for freeze operation

 drivers/android/binder.c          |  22 ++++-
 drivers/android/binder/context.rs |  16 +++-
 drivers/android/binder/process.rs |  25 ++++--
 rust/helpers/helpers.c            |   1 +
 rust/helpers/pid.c                |  13 +++
 rust/kernel/lib.rs                |   1 +
 rust/kernel/pid.rs                | 138 ++++++++++++++++++++++++++++++
 rust/kernel/pid_namespace.rs      |  17 ++++
 rust/kernel/task.rs               |  13 +++
 9 files changed, 236 insertions(+), 10 deletions(-)
 create mode 100644 rust/helpers/pid.c
 create mode 100644 rust/kernel/pid.rs

-- 
2.25.1