kernel.git/tools/testing/selftests/bpf/test_kmods/bpf_testmod.c, branch master

selftests/bpf: Fix map_kptr grace period wait

2026-02-13T22:14:27Z

Commit c27cea4416a3 ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast") broke map_kptr selftest since it removed the function we were kprobing. Use a new kfunc that invokes call_rcu_tasks_trace and sets a program provided pointer to an integer to 1. Technically this can be unsafe if the memory being written to from the callback disappears, but this is just for usage in a test where we ensure we spin until we see the value to be set to 1, so it's ok. Reported-by: Shung-Hsi Yu Fixes: c27cea4416a3 ("rcu: Re-implement RCU Tasks Trace in terms of SRCU-fast") Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260211185747.3630539-1-memxor@gmail.com Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tests for execution context helpers

2026-01-25T16:20:50Z

Add a new selftest suite `exe_ctx` to verify the accuracy of the bpf_in_task(), bpf_in_hardirq(), and bpf_in_serving_softirq() helpers introduced in bpf_experimental.h. Testing these execution contexts deterministically requires crossing context boundaries within a single CPU. To achieve this, the test implements a "Trigger-Observer" pattern using bpf_testmod: 1. Trigger: A BPF syscall program calls a new bpf_testmod kfunc bpf_kfunc_trigger_ctx_check(). 2. Task to HardIRQ: The kfunc uses irq_work_queue() to trigger a self-IPI on the local CPU. 3. HardIRQ to SoftIRQ: The irq_work handler calls a dummy function (observed by BPF fentry) and then schedules a tasklet to transition into SoftIRQ context. The user-space runner ensures determinism by pinning itself to CPU 0 before execution, forcing the entire interrupt chain to remain on a single core. Dummy noinline functions with compiler barriers are added to bpf_testmod.c to serve as stable attachment points for fentry programs. A retry loop is used in user-space to wait for the asynchronous SoftIRQ to complete. Note that testing on s390x is avoided because supporting those helpers purely in BPF on s390x is not possible at this point. Reviewed-by: Alexei Starovoitov Signed-off-by: Changwoo Min Link: https://lore.kernel.org/r/20260125115413.117502-3-changwoo@igalia.com Signed-off-by: Alexei Starovoitov

selftests/bpf: test bpf_get_func_arg() for tp_btf

2026-01-21T17:31:35Z

Test bpf_get_func_arg() and bpf_get_func_arg_cnt() for tp_btf. The code is most copied from test1 and test2. Signed-off-by: Menglong Dong Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20260121044348.113201-3-dongml2@chinatelecom.cn Signed-off-by: Alexei Starovoitov

selftests/bpf: update verifier test for default trusted pointer semantics

2026-01-21T01:11:24Z

Replace the verifier test for default trusted pointer semantics, which previously relied on BPF kfunc bpf_get_root_mem_cgroup(), with a new test utilizing dedicated BPF kfuncs defined within the bpf_testmod. bpf_get_root_mem_cgroup() was modified such that it again relies on KF_ACQUIRE semantics, therefore no longer making it a suitable candidate to test BPF verifier default trusted pointer semantics against. Link: https://lore.kernel.org/bpf/20260113083949.2502978-2-mattbobrowski@google.com Signed-off-by: Matt Bobrowski Link: https://lore.kernel.org/r/20260120091630.3420452-1-mattbobrowski@google.com Signed-off-by: Alexei Starovoitov

selftests/bpf: Migrate struct_ops_assoc test to KF_IMPLICIT_ARGS

2026-01-21T00:22:38Z

A test kfunc named bpf_kfunc_multi_st_ops_test_1_impl() is a user of __prog suffix. Subsequent patch removes __prog support in favor of KF_IMPLICIT_ARGS, so migrate this kfunc to use implicit argument. Signed-off-by: Ihor Solodrai Link: https://lore.kernel.org/r/20260120222638.3976562-12-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov

selftests/bpf: Add tests for KF_IMPLICIT_ARGS

2026-01-21T00:15:57Z

Add trivial end-to-end tests to validate that KF_IMPLICIT_ARGS flag is properly handled by both resolve_btfids and the verifier. Declare kfuncs in bpf_testmod. Check that bpf_prog_aux pointer is set in the kfunc implementation. Verify that calls with implicit args and a legacy case all work. Acked-by: Eduard Zingerman Signed-off-by: Ihor Solodrai Link: https://lore.kernel.org/r/20260120222638.3976562-7-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov

selftests/bpf: Use the correct destructor kfunc type

2026-01-13T02:53:57Z

With CONFIG_CFI enabled, the kernel strictly enforces that indirect function calls use a function pointer type that matches the target function. As bpf_testmod_ctx_release() signature differs from the btf_dtor_kfunc_t pointer type used for the destructor calls in bpf_obj_free_fields(), add a stub function with the correct type to fix the type mismatch. Signed-off-by: Sami Tolvanen Acked-by: Yonghong Song Link: https://lore.kernel.org/r/20260110082548.113748-9-samitolvanen@google.com Signed-off-by: Alexei Starovoitov

bpf: Remove redundant KF_TRUSTED_ARGS flag from all kfuncs

2026-01-02T20:04:28Z

Now that KF_TRUSTED_ARGS is the default for all kfuncs, remove the explicit KF_TRUSTED_ARGS flag from all kfunc definitions and remove the flag itself. Acked-by: Eduard Zingerman Reviewed-by: Emil Tsalapatis Signed-off-by: Puranjay Mohan Link: https://lore.kernel.org/r/20260102180038.2708325-3-puranjay@kernel.org Signed-off-by: Alexei Starovoitov

selftests/bpf: Test BPF_PROG_ASSOC_STRUCT_OPS command

2025-12-06T00:17:58Z

Test BPF_PROG_ASSOC_STRUCT_OPS command that associates a BPF program with a struct_ops. The test follows the same logic in commit ba7000f1c360 ("selftests/bpf: Test multi_st_ops and calling kfuncs from different programs"), but instead of using map id to identify a specific struct_ops, this test uses the new BPF command to associate a struct_ops with a program. The test consists of two sets of almost identical struct_ops maps and BPF programs associated with the map. Their only difference is the unique value returned by bpf_testmod_multi_st_ops::test_1(). The test first loads the programs and associates them with struct_ops maps. Then, it exercises the BPF programs. They will in turn call kfunc bpf_kfunc_multi_st_ops_test_1_prog_arg() to trigger test_1() of the associated struct_ops map, and then check if the right unique value is returned. Signed-off-by: Amery Hung Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20251203233748.668365-5-ameryhung@gmail.com

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

2025-11-20T17:13:26Z

Cross-merge networking fixes after downstream PR (net-6.18-rc7). No conflicts, adjacent changes: tools/testing/selftests/net/af_unix/Makefile e1bb28bf13f4 ("selftest: af_unix: Add test for SO_PEEK_OFF.") 45a1cd8346ca ("selftests: af_unix: Add tests for ECONNRESET and EOF semantics") Signed-off-by: Jakub Kicinski