Merge branch 'bpf-fix-stream-capacity-read-and-oversize-handling'

Jianlin Shi says:

====================
v3 addressed Kartikeya's review on v2 and the related Sashiko findings.
v4 fixes the stream_oversize selftest to verify capacity rollback on the
same BPF program stream, since streams live on prog->aux and are not
shared across programs.

Tested locally:
  stream_oversize and stream_partial_read (equivalent to
  ./test_progs -t stream_oversize,stream_partial_read).

Changelog:
v3 -> v4:
  - In stream_oversize, perform the oversized bpf_stream_printk() and a
    subsequent successful "foo" push in the same program; read that
    program's stream in userspace instead of switching to stream_syscall.
  - Drop a redundant vscnprintf() comment in bpf_stream_stage_printk().

v2 -> v3:
  - Refactor bpf_stream_release_capacity() to take a length.
  - Fix staging-path capacity leak; use vscnprintf().
  - Return partial bpf_stream_read() progress on copy_to_user() fault.
  - Reject truncated bpf_stream_vprintk() output with -E2BIG.
  - Add selftests for oversize and straddling-buffer partial read.

v1 -> v2:
  - Retarget to bpf-next as suggested by Pu Lehui.

Links:
v3: https://lore.kernel.org/bpf/?q=%22PATCH+bpf-next+v3+0%2F5%22+fix+stream+capacity
v2: https://lore.kernel.org/bpf/tencent_C919BB32458A4DAD645A68F441345B971E05@qq.com/
v1: https://lore.kernel.org/bpf/tencent_E69EAE29327E25B3548A9AF3F4FA289A6806@qq.com/
====================

Link: https://lore.kernel.org/r/cover.1787492521.git.shijianlin11@foxmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

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