Merge branch 'add-open-coded-task-css_task-and-css-iters'

Chuyi Zhou says:

====================
Add Open-coded task, css_task and css iters

This is version 6 of task, css_task and css iters support.

--- Changelog ---

v5 -> v6:

Patch #3:
 * In bpf_iter_task_next, return pos rather than goto out. (Andrii)
Patch #2, #3, #4:
 * Add the missing __diag_ignore_all to avoid kernel build warning
Patch #5, #6, #7:
 * Add Andrii's ack

Patch #8:
 * In BPF prog iter_css_task_for_each, return -EPERM rather than 0, and
   ensure stack_mprotect() in iters.c not success. If not, it would cause
   the subsequent 'test_lsm' fail, since the 'is_stack' check in
   test_int_hook(lsm.c) would not be guaranteed.
   (https://github.com/kernel-patches/bpf/actions/runs/6489662214/job/17624665086?pr=5790)

v4 -> v5:https://lore.kernel.org/lkml/20231007124522.34834-1-zhouchuyi@bytedance.com/

Patch 3~4:
 * Relax the BUILD_BUG_ON check in bpf_iter_task_new and bpf_iter_css_new to avoid
   netdev/build_32bit CI error.
   (https://netdev.bots.linux.dev/static/nipa/790929/13412333/build_32bit/stderr)
Patch 8:
 * Initialize skel pointer to fix the LLVM-16 build CI error
   (https://github.com/kernel-patches/bpf/actions/runs/6462875618/job/17545170863)

v3 -> v4:https://lore.kernel.org/all/20230925105552.817513-1-zhouchuyi@bytedance.com/

* Address all the comments from Andrii in patch-3 ~ patch-6
* Collect Tejun's ack
* Add a extra patch to rename bpf_iter_task.c to bpf_iter_tasks.c
* Seperate three BPF program files for selftests (iters_task.c iters_css_task.c iters_css.c)

v2 -> v3:https://lore.kernel.org/lkml/20230912070149.969939-1-zhouchuyi@bytedance.com/

Patch 1 (cgroup: Prepare for using css_task_iter_*() in BPF)
  * Add tj's ack and Alexei's suggest-by.
Patch 2 (bpf: Introduce css_task open-coded iterator kfuncs)
  * Use bpf_mem_alloc/bpf_mem_free rather than kzalloc()
  * Add KF_TRUSTED_ARGS for bpf_iter_css_task_new (Alexei)
  * Move bpf_iter_css_task's definition from uapi/linux/bpf.h to
    kernel/bpf/task_iter.c and we can use it from vmlinux.h
  * Move bpf_iter_css_task_XXX's declaration from bpf_helpers.h to
    bpf_experimental.h
Patch 3 (Introduce task open coded iterator kfuncs)
  * Change th API design keep consistent with SEC("iter/task"), support
    iterating all threads(BPF_TASK_ITERATE_ALL) and threads of a
    specific task (BPF_TASK_ITERATE_THREAD).（Andrii)
  * Move bpf_iter_task's definition from uapi/linux/bpf.h to
    kernel/bpf/task_iter.c and we can use it from vmlinux.h
  * Move bpf_iter_task_XXX's declaration from bpf_helpers.h to
    bpf_experimental.h
Patch 4 (Introduce css open-coded iterator kfuncs)
  * Change th API design keep consistent with cgroup_iters, reuse
    BPF_CGROUP_ITER_DESCENDANTS_PRE/BPF_CGROUP_ITER_DESCENDANTS_POST
    /BPF_CGROUP_ITER_ANCESTORS_UP(Andrii)
  * Add KF_TRUSTED_ARGS for bpf_iter_css_new
  * Move bpf_iter_css's definition from uapi/linux/bpf.h to
    kernel/bpf/task_iter.c and we can use it from vmlinux.h
  * Move bpf_iter_css_XXX's declaration from bpf_helpers.h to
    bpf_experimental.h
Patch 5 (teach the verifier to enforce css_iter and task_iter in RCU CS)
  * Add KF flag KF_RCU_PROTECTED to maintain kfuncs which need RCU CS.(Andrii)
  * Consider STACK_ITER when using bpf_for_each_spilled_reg.
Patch 6 (Let bpf_iter_task_new accept null task ptr)
  * Add this extra patch to let bpf_iter_task_new accept a 'nullable'
  * task pointer(Andrii)
Patch 7 (selftests/bpf: Add tests for open-coded task and css iter)
  * Add failure testcase(Alexei)

Changes from v1(https://lore.kernel.org/lkml/20230827072057.1591929-1-zhouchuyi@bytedance.com/):
- Add a pre-patch to make some preparations before supporting css_task
  iters.(Alexei)
- Add an allowlist for css_task iters(Alexei)
- Let bpf progs do explicit bpf_rcu_read_lock() when using process
  iters and css_descendant iters.(Alexei)
---------------------

In some BPF usage scenarios, it will be useful to iterate the process and
css directly in the BPF program. One of the expected scenarios is
customizable OOM victim selection via BPF[1].

Inspired by Dave's task_vma iter[2], this patchset adds three types of
open-coded iterator kfuncs:

1. bpf_task_iters. It can be used to
1) iterate all process in the system, like for_each_forcess() in kernel.
2) iterate all threads in the system.
3) iterate all threads of a specific task

2. bpf_css_iters. It works like css_task_iter_{start, next, end} and would
be used to iterating tasks/threads under a css.

3. css_iters. It works like css_next_descendant_{pre, post} to iterating all
descendant css.

BPF programs can use these kfuncs directly or through bpf_for_each macro.

link[1]: https://lore.kernel.org/lkml/20230810081319.65668-1-zhouchuyi@bytedance.com/
link[2]: https://lore.kernel.org/all/20230810183513.684836-1-davemarchevsky@fb.com/
====================

Link: https://lore.kernel.org/r/20231018061746.111364-1-zhouchuyi@bytedance.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 65 insertions, 0 deletions

diff --git a/kernel/bpf/cgroup_iter.c b/kernel/bpf/cgroup_iter.c
index 810378f04fbc..209e5135f9fb 100644
--- a/kernel/bpf/cgroup_iter.c
+++ b/kernel/bpf/cgroup_iter.c
@@ -294,3 +294,68 @@ static int __init bpf_cgroup_iter_init(void)
 }
 
 late_initcall(bpf_cgroup_iter_init);
+
+struct bpf_iter_css {
+	__u64 __opaque[3];
+} __attribute__((aligned(8)));
+
+struct bpf_iter_css_kern {
+	struct cgroup_subsys_state *start;
+	struct cgroup_subsys_state *pos;
+	unsigned int flags;
+} __attribute__((aligned(8)));
+
+__diag_push();
+__diag_ignore_all("-Wmissing-prototypes",
+		"Global functions as their definitions will be in vmlinux BTF");
+
+__bpf_kfunc int bpf_iter_css_new(struct bpf_iter_css *it,
+		struct cgroup_subsys_state *start, unsigned int flags)
+{
+	struct bpf_iter_css_kern *kit = (void *)it;
+
+	BUILD_BUG_ON(sizeof(struct bpf_iter_css_kern) > sizeof(struct bpf_iter_css));
+	BUILD_BUG_ON(__alignof__(struct bpf_iter_css_kern) != __alignof__(struct bpf_iter_css));
+
+	kit->start = NULL;
+	switch (flags) {
+	case BPF_CGROUP_ITER_DESCENDANTS_PRE:
+	case BPF_CGROUP_ITER_DESCENDANTS_POST:
+	case BPF_CGROUP_ITER_ANCESTORS_UP:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	kit->start = start;
+	kit->pos = NULL;
+	kit->flags = flags;
+	return 0;
+}
+
+__bpf_kfunc struct cgroup_subsys_state *bpf_iter_css_next(struct bpf_iter_css *it)
+{
+	struct bpf_iter_css_kern *kit = (void *)it;
+
+	if (!kit->start)
+		return NULL;
+
+	switch (kit->flags) {
+	case BPF_CGROUP_ITER_DESCENDANTS_PRE:
+		kit->pos = css_next_descendant_pre(kit->pos, kit->start);
+		break;
+	case BPF_CGROUP_ITER_DESCENDANTS_POST:
+		kit->pos = css_next_descendant_post(kit->pos, kit->start);
+		break;
+	case BPF_CGROUP_ITER_ANCESTORS_UP:
+		kit->pos = kit->pos ? kit->pos->parent : kit->start;
+	}
+
+	return kit->pos;
+}
+
+__bpf_kfunc void bpf_iter_css_destroy(struct bpf_iter_css *it)
+{
+}
+
+__diag_pop();
\ No newline at end of file