linux.git/tools/testing/selftests/bpf, branch v6.18

selftests/bpf: Test widen_imprecise_scalars() with different stack depth

2025-11-14T17:26:28+00:00

A test case for a situation when widen_imprecise_scalars() is called
with old->allocated_stack > cur->allocated_stack. Test structure:

    def widening_stack_size_bug():
      r1 = 0
      for r6 in 0..1:
        iterator_with_diff_stack_depth(r1)
        r1 = 42

    def iterator_with_diff_stack_depth(r1):
      if r1 != 42:
        use 128 bytes of stack
      iterator based loop

iterator_with_diff_stack_depth() is verified with r1 == 0 first and
r1 == 42 next. Causing stack usage of 128 bytes on a first visit and 8
bytes on a second. Such arrangement triggered a KASAN error in
widen_imprecise_scalars().

Signed-off-by: Eduard Zingerman 
Link: https://lore.kernel.org/r/20251114025730.772723-2-eddyz87@gmail.com
Signed-off-by: Alexei Starovoitov

selftests/bpf: Add mptcp test with sockmap

2025-11-13T21:18:25+00:00

Add test cases to verify that when MPTCP falls back to plain TCP sockets,
they can properly work with sockmap.

Additionally, add test cases to ensure that sockmap correctly rejects
MPTCP sockets as expected.

Signed-off-by: Jiayuan Chen 
Signed-off-by: Martin KaFai Lau 
Acked-by: Matthieu Baerts (NGI0) 
Link: https://patch.msgid.link/20251111060307.194196-4-jiayuan.chen@linux.dev

selftests/bpf: Add stacktrace ips test for raw_tp

2025-11-06T01:05:19+00:00

Adding test that verifies we get expected initial 2 entries from
stacktrace for rawtp probe via ORC unwind.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20251104215405.168643-5-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov 
Acked-by: Steven Rostedt (Google)

selftests/bpf: Add stacktrace ips test for kprobe_multi/kretprobe_multi

2025-11-06T01:05:19+00:00

Adding test that attaches kprobe/kretprobe multi and verifies the
ORC stacktrace matches expected functions.

Adding bpf_testmod_stacktrace_test function to bpf_testmod kernel
module which is called through several functions so we get reliable
call path for stacktrace.

The test is only for ORC unwinder to keep it simple.

Signed-off-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20251104215405.168643-4-jolsa@kernel.org
Signed-off-by: Alexei Starovoitov 
Acked-by: Steven Rostedt (Google)

bpf: add _impl suffix for bpf_stream_vprintk() kfunc

2025-11-05T01:50:25+00:00

Rename bpf_stream_vprintk() to bpf_stream_vprintk_impl().

This makes bpf_stream_vprintk() follow the already established "_impl"
suffix-based naming convention for kfuncs with the bpf_prog_aux
argument provided by the verifier implicitly. This convention will be
taken advantage of with the upcoming KF_IMPLICIT_ARGS feature to
preserve backwards compatibility to BPF programs.

Acked-by: Andrii Nakryiko 
Signed-off-by: Mykyta Yatsenko 
Link: https://lore.kernel.org/r/20251104-implv2-v3-2-4772b9ae0e06@meta.com
Signed-off-by: Alexei Starovoitov 
Acked-by: Ihor Solodrai

bpf:add _impl suffix for bpf_task_work_schedule* kfuncs

2025-11-05T01:50:25+00:00

Rename:
bpf_task_work_schedule_resume()->bpf_task_work_schedule_resume_impl()
bpf_task_work_schedule_signal()->bpf_task_work_schedule_signal_impl()

This aligns task work scheduling kfuncs with the established naming
scheme for kfuncs with the bpf_prog_aux argument provided by the
verifier implicitly. This convention will be taken advantage of with the
upcoming KF_IMPLICIT_ARGS feature to preserve backwards compatibility to
BPF programs.

Acked-by: Andrii Nakryiko 
Signed-off-by: Mykyta Yatsenko 
Link: https://lore.kernel.org/r/20251104-implv2-v3-1-4772b9ae0e06@meta.com
Signed-off-by: Alexei Starovoitov 
Acked-by: Ihor Solodrai

selftests/bpf: Add tests for livepatch + bpf trampoline

2025-11-04T01:22:06+00:00

Both livepatch and BPF trampoline use ftrace. Special attention is needed
when livepatch and fexit program touch the same function at the same
time, because livepatch updates a kernel function and the BPF trampoline
need to call into the right version of the kernel function.

Use samples/livepatch/livepatch-sample.ko for the test.

The test covers two cases:
  1) When a fentry program is loaded first. This exercises the
     modify_ftrace_direct code path.
  2) When a fentry program is loaded first. This exercises the
     register_ftrace_direct code path.

Signed-off-by: Song Liu 
Reviewed-by: Jiri Olsa 
Link: https://lore.kernel.org/r/20251027175023.1521602-4-song@kernel.org
Signed-off-by: Alexei Starovoitov 
Acked-by: Steven Rostedt (Google)

selftests/bpf: Fix redefinition of 'off' as different kind of symbol

2025-10-17T18:33:23+00:00

This fixes the following build error

   CLNG-BPF [test_progs] verifier_global_ptr_args.bpf.o
progs/verifier_global_ptr_args.c:228:5: error: redefinition of 'off' as
different kind of symbol
   228 | u32 off;
       |     ^

The symbol 'off' was previously defined in
tools/testing/selftests/bpf/tools/include/vmlinux.h, which includes an
enum i40e_ptp_gpio_pin_state from
drivers/net/ethernet/intel/i40e/i40e_ptp.c:

	enum i40e_ptp_gpio_pin_state {
		end = -2,
		invalid = -1,
		off = 0,
		in_A = 1,
		in_B = 2,
		out_A = 3,
		out_B = 4,
	};

This enum is included when CONFIG_I40E is enabled. As of commit
032676ff8217 ("LoongArch: Update Loongson-3 default config file"),
CONFIG_I40E is set in the defconfig, which leads to the conflict.

Renaming the local variable avoids the redefinition and allows the
build to succeed.

Suggested-by: Yonghong Song 
Signed-off-by: Brahmajit Das 
Acked-by: Yonghong Song 
Link: https://lore.kernel.org/r/20251017171551.53142-1-listout@listout.xyz
Signed-off-by: Alexei Starovoitov

selftests: arg_parsing: Ensure data is flushed to disk before reading.

2025-10-16T16:34:39+00:00

test_parse_test_list_file writes some data to
/tmp/bpf_arg_parsing_test.XXXXXX and parse_test_list_file() will read
the data back.  However, after writing data to that file, we forget to
call fsync() and it's causing testing failure in my laptop.  This patch
helps fix it by adding the missing fsync() call.

Fixes: 64276f01dce8 ("selftests/bpf: Test_progs can read test lists from file")
Signed-off-by: Xing Guo 
Signed-off-by: Andrii Nakryiko 
Link: https://lore.kernel.org/bpf/20251016035330.3217145-1-higuoxing@gmail.com

selftests/bpf: make arg_parsing.c more robust to crashes

2025-10-14T23:39:33+00:00

We started getting a crash in BPF CI, which seems to originate from
test_parse_test_list_file() test and is happening at this line:

  ASSERT_OK(strcmp("test_with_spaces", set.tests[0].name), "test 0 name");

One way we can crash there is if set.cnt zero, which is checked for with
ASSERT_EQ() above, but we proceed after this regardless of the outcome.
Instead of crashing, we should bail out with test failure early.

Similarly, if parse_test_list_file() fails, we shouldn't be even looking
at set, so bail even earlier if ASSERT_OK() fails.

Fixes: 64276f01dce8 ("selftests/bpf: Test_progs can read test lists from file")
Signed-off-by: Andrii Nakryiko 
Tested-by: Ihor Solodrai 
Link: https://lore.kernel.org/r/20251014202037.72922-1-andrii@kernel.org
Signed-off-by: Alexei Starovoitov