selftests/bpf: Test stack-passed struct_ops arena arguments

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Add a test_arena_stack member with eight leading scalar arguments so the
arena pointer is passed on the stack.

The callback validates the first and last scalar ctx slots before
dereferencing the pointer in ctx[8]. This exercises the indirect
trampoline stack layout and arena conversion together, and prevents a
regression where stack arguments are read one slot late.

Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Tested-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://patch.msgid.link/20260808003938.3486067-13-memxor@gmail.com
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>

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Tejun Heo 2026-08-08 02:39:32 +02:00 • committed by Eduard Zingerman

parent 596824de8c

commit 2d4de9a493

4 changed files with 39 additions and 0 deletions

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21

tools/testing/selftests/bpf/progs/struct_ops_arena.c

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14

tools/testing/selftests/bpf/test_kmods/bpf_testmod.c

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3

tools/testing/selftests/bpf/test_kmods/bpf_testmod.h

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1

tools/testing/selftests/bpf/test_kmods/bpf_testmod_kfunc.h

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