Merge branch 'bpf-bound-rdonly-rdwr_buf_size-kfunc-return-size'

Nicholas Dudar says:

====================
bpf: bound rdonly/rdwr_buf_size kfunc return size

check_kfunc_args() stores a kfunc's rdonly_buf_size/rdwr_buf_size
argument into a u64 that check_kfunc_call() later narrows into the
returned register's u32 mem_size, so a value above U32_MAX truncates
instead of being rejected. Fix it and add a selftest for coverage.

Changelog:
----------
v1 -> v2 (v1 was a private report to security@kernel.org)

 * Split the fix and selftest into separate patches.
 * Target bpf-next instead of bpf.
====================

Link: https://patch.msgid.link/20260709155837.1879230-1-main.kalliope@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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