selftests/bpf: Add tests for open-coded task_vma iter

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The open-coded task_vma iter added earlier in this series allows for
natural iteration over a task's vmas using existing open-coded iter
infrastructure, specifically bpf_for_each.

This patch adds a test demonstrating this pattern and validating
correctness. The vma->vm_start and vma->vm_end addresses of the first
1000 vmas are recorded and compared to /proc/PID/maps output. As
expected, both see the same vmas and addresses - with the exception of
the [vsyscall] vma - which is explained in a comment in the prog_tests
program.

Signed-off-by: Dave Marchevsky <davemarchevsky@fb.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20231013204426.1074286-5-davemarchevsky@fb.com

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Dave Marchevsky 2023-10-13 13:44:25 -07:00 • committed by Andrii Nakryiko

parent 4ac4546821

commit e0e1a7a5fc

3 changed files with 109 additions and 0 deletions

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8

tools/testing/selftests/bpf/bpf_experimental.h

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58

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

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43

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

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