Merge tag 'bpf-next-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Pull bpf updates from Alexei Starovoitov:

- Support pulling non-linear xdp data with bpf_xdp_pull_data() kfu

Merge tag 'bpf-next-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Pull bpf updates from Alexei Starovoitov:

- Support pulling non-linear xdp data with bpf_xdp_pull_data() kfunc
(Amery Hung)

Applied as a stable branch in bpf-next and net-next trees.

- Support reading skb metadata via bpf_dynptr (Jakub Sitnicki)

Also a stable branch in bpf-next and net-next trees.

- Enforce expected_attach_type for tailcall compatibility (Daniel
Borkmann)

- Replace path-sensitive with path-insensitive live stack analysis in
the verifier (Eduard Zingerman)

This is a significant change in the verification logic. More details,
motivation, long term plans are in the cover letter/merge commit.

- Support signed BPF programs (KP Singh)

This is another major feature that took years to materialize.

Algorithm details are in the cover letter/marge commit

- Add support for may_goto instruction to s390 JIT (Ilya Leoshkevich)

- Add support for may_goto instruction to arm64 JIT (Puranjay Mohan)

- Fix USDT SIB argument handling in libbpf (Jiawei Zhao)

- Allow uprobe-bpf program to change context registers (Jiri Olsa)

- Support signed loads from BPF arena (Kumar Kartikeya Dwivedi and
Puranjay Mohan)

- Allow access to union arguments in tracing programs (Leon Hwang)

- Optimize rcu_read_lock() + migrate_disable() combination where it's
used in BPF subsystem (Menglong Dong)

- Introduce bpf_task_work_schedule*() kfuncs to schedule deferred
execution of BPF callback in the context of a specific task using the
kernel’s task_work infrastructure (Mykyta Yatsenko)

- Enforce RCU protection for KF_RCU_PROTECTED kfuncs (Kumar Kartikeya
Dwivedi)

- Add stress test for rqspinlock in NMI (Kumar Kartikeya Dwivedi)

- Improve the precision of tnum multiplier verifier operation
(Nandakumar Edamana)

- Use tnums to improve is_branch_taken() logic (Paul Chaignon)

- Add support for atomic operations in arena in riscv JIT (Pu Lehui)

- Report arena faults to BPF error stream (Puranjay Mohan)

- Search for tracefs at /sys/kernel/tracing first in bpftool (Quentin
Monnet)

- Add bpf_strcasecmp() kfunc (Rong Tao)

- Support lookup_and_delete_elem command in BPF_MAP_STACK_TRACE (Tao
Chen)

* tag 'bpf-next-6.18' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (197 commits)
libbpf: Replace AF_ALG with open coded SHA-256
selftests/bpf: Add stress test for rqspinlock in NMI
selftests/bpf: Add test case for different expected_attach_type
bpf: Enforce expected_attach_type for tailcall compatibility
bpftool: Remove duplicate string.h header
bpf: Remove duplicate crypto/sha2.h header
libbpf: Fix error when st-prefix_ops and ops from differ btf
selftests/bpf: Test changing packet data from kfunc
selftests/bpf: Add stacktrace map lookup_and_delete_elem test case
selftests/bpf: Refactor stacktrace_map case with skeleton
bpf: Add lookup_and_delete_elem for BPF_MAP_STACK_TRACE
selftests/bpf: Fix flaky bpf_cookie selftest
selftests/bpf: Test changing packet data from global functions with a kfunc
bpf: Emit struct bpf_xdp_sock type in vmlinux BTF
selftests/bpf: Task_work selftest cleanup fixes
MAINTAINERS: Delete inactive maintainers from AF_XDP
bpf: Mark kfuncs as __noclone
selftests/bpf: Add kprobe multi write ctx attach test
selftests/bpf: Add kprobe write ctx attach test
selftests/bpf: Add uprobe context ip register change test
...

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Merge branch 'selftests-bpf-introduce-experimental-bpf_in_interrupt'

Leon Hwang says:

====================
selftests/bpf: Introduce experimental bpf_in_interrupt()

Filtering pid_tgid is meanlingle

Merge branch 'selftests-bpf-introduce-experimental-bpf_in_interrupt'

Leon Hwang says:

====================
selftests/bpf: Introduce experimental bpf_in_interrupt()

Filtering pid_tgid is meanlingless when the current task is preempted by
an interrupt.

To address this, introduce 'bpf_in_interrupt()' helper function, which
allows BPF programs to determine whether they are executing in interrupt
context.

'get_preempt_count()':

* On x86, '*(int *) bpf_this_cpu_ptr(&__preempt_count)'.
* On arm64, 'bpf_get_current_task_btf()->thread_info.preempt.count'.

Then 'bpf_in_interrupt()' will be:

* If !PREEMPT_RT, 'get_preempt_count() & (NMI_MASK | HARDIRQ_MASK
| SOFTIRQ_MASK)'.
* If PREEMPT_RT, '(get_preempt_count() & (NMI_MASK | HARDIRQ_MASK))
| (bpf_get_current_task_btf()->softirq_disable_cnt & SOFTIRQ_MASK)'.

'bpf_in_interrupt()' runs well when PREEMPT_RT is enabled. But it's
difficult for me to test it well because I'm not familiar with
PREEMPT_RT.

Changes:
v2 -> v3:
* Address comments from Alexei:
* Move bpf_in_interrupt() to bpf_experimental.h.
* Add support for arm64.
v2: https://lore.kernel.org/bpf/20250825131502.54269-1-leon.hwang@linux.dev/

v1 -> v2:
* Fix a build error reported by test bot.
====================

Link: https://patch.msgid.link/20250903140438.59517-1-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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selftests/bpf: Add case to test bpf_in_interrupt()

Add a timer test case to test 'bpf_in_interrupt()'.

cd tools/testing/selftests/bpf
./test_progs -t timer_interrupt
462 timer_interrupt:OK
Summ

selftests/bpf: Add case to test bpf_in_interrupt()

Add a timer test case to test 'bpf_in_interrupt()'.

cd tools/testing/selftests/bpf
./test_progs -t timer_interrupt
462 timer_interrupt:OK
Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/r/20250903140438.59517-3-leon.hwang@linux.dev
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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