Merge branch 'add-missing-size-check-for-btf-based-ctx-access'

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Kumar Kartikeya Dwivedi says:

====================
Add missing size check for BTF-based ctx access

This set fixes a issue reported for tracing and struct ops programs
using btf_ctx_access for ctx checks, where loading a pointer argument
from the ctx doesn't enforce a BPF_DW access size check. The original
report is at link [0]. Also add a regression test along with the fix.

  [0]: https://lore.kernel.org/bpf/51338.1732985814@localhost
====================

Link: https://patch.msgid.link/20241212092050.3204165-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Alexei Starovoitov 2024-12-12 11:40:18 -08:00

parent 04789af756 8025731c28

commit e4c80f6975

3 changed files with 46 additions and 4 deletions

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6

kernel/bpf/btf.c

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40

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

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4

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

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