bpf/selftests: Add bpf_get_task_stack retval bounds verifier test

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Add a bpf_iter test 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/20210416204704.2816874-3-davemarchevsky@fb.com

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Dave Marchevsky 2021-04-16 13:47:03 -07:00 • committed by Alexei Starovoitov

parent fd0b88f73f

commit bdc4e36945

1 changed files with 43 additions and 0 deletions

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tools/testing/selftests/bpf/verifier/bpf_get_stack.c

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