bpf: add plumbing for file-backed dynptr

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Add the necessary verifier plumbing for the new file-backed dynptr type.
Introduce two kfuncs for its lifecycle management:
 * bpf_dynptr_from_file() for initialization
 * bpf_dynptr_file_discard() for destruction

Currently there is no mechanism for kfunc to release dynptr, this patch
add one:
 * Dynptr release function sets meta->release_regno
 * Call unmark_stack_slots_dynptr() if meta->release_regno is set and
 dynptr ref_obj_id is set as well.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20251026203853.135105-7-mykyta.yatsenko5@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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This commit is contained in:

Mykyta Yatsenko 2025-10-26 20:38:49 +00:00 • committed by Alexei Starovoitov

parent 9cba966f1c

commit 8d8771dc03

4 changed files with 45 additions and 7 deletions

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7

include/linux/bpf.h

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12

kernel/bpf/helpers.c

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2

kernel/bpf/log.c

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31

kernel/bpf/verifier.c

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