bpf/selftests: Add bpf_get_task_stack retval bounds test_prog

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Add a libbpf test prog which feeds bpf_get_task_stack's return value
into seq_write after confirming it's positive. No attempt to bound the
value from above is made.

Load will fail if verifier does not refine retval range based on buf sz
input to bpf_get_task_stack.

Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/bpf/20210416204704.2816874-4-davemarchevsky@fb.com

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Dave Marchevsky 2021-04-16 13:47:04 -07:00 • committed by Alexei Starovoitov

parent bdc4e36945

commit c77cec5c20

2 changed files with 28 additions and 0 deletions

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1

tools/testing/selftests/bpf/prog_tests/bpf_iter.c

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27

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

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