Merge patch series "bpf: Fix OOB in pcpu_init_value and add a test"

xulang <xulang@uniontech.com> says:
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Fix OOB read when copying element from a BPF_MAP_TYPE_CGROUP_STORAGE
map to another pcpu map with the same value_size that is not rounded
up to 8 bytes, and add a test case to reproduce the issue.

The root cause is that pcpu_init_value() uses copy_map_value_long() which
rounds up the copy size to 8 bytes, but CGROUP_STORAGE map values are not
8-byte aligned (e.g., 4-byte). This causes a 4-byte OOB read when
the copy is performed.
====================

Link: https://lore.kernel.org/r/7653EEEC2BAB17DF+20260402073948.2185396-1-xulang@uniontech.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --cc kernel/bpf/hashtab.c
Simple merge

diff --cc tools/testing/selftests/bpf/prog_tests/cgroup_storage.c
Simple merge