Merge branch 'bpf-allow-bpf_for-bpf_repeat-while-holding-spin'

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Emil Tsalapatis says:

====================
In BPF programs, kfunc calls while holding a lock are not allowed
because kfuncs may sleep by default. The exception to this rule are the
functions in special_kfunc_list, which are guaranteed to not sleep. The
bpf_iter_num_* functions used by the bpf_for and bpf_repeat macros make
no function calls themselves, and as such are guaranteed to not sleep.
Add them to special_kfunc_list to allow them within BPF spinlock
critical sections.

Signed-off-by: Emil Tsalapatis (Meta) <emil@etsalapatis.com>
====================

Link: https://patch.msgid.link/20250104202528.882482-1-emil@etsalapatis.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Alexei Starovoitov 2025-01-06 10:59:50 -08:00

parent 2532608530 87091dd986

commit 859a7db4c7

2 changed files with 45 additions and 1 deletions

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20

kernel/bpf/verifier.c

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26

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

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