Merge https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf

Daniel Borkmann says:

====================
pull-request: bpf 2021-11-16

We've added 12 non-merge commits during the last 5 day(s) which contain
a total of 23 files changed, 573 insertions(+), 73 deletions(-).

The main changes are:

1) Fix pruning regression where verifier went overly conservative rejecting
   previsouly accepted programs, from Alexei Starovoitov and Lorenz Bauer.

2) Fix verifier TOCTOU bug when using read-only map's values as constant
   scalars during verification, from Daniel Borkmann.

3) Fix a crash due to a double free in XSK's buffer pool, from Magnus Karlsson.

4) Fix libbpf regression when cross-building runqslower, from Jean-Philippe Brucker.

5) Forbid use of bpf_ktime_get_coarse_ns() and bpf_timer_*() helpers in tracing
   programs due to deadlock possibilities, from Dmitrii Banshchikov.

6) Fix checksum validation in sockmap's udp_read_sock() callback, from Cong Wang.

7) Various BPF sample fixes such as XDP stats in xdp_sample_user, from Alexander Lobakin.

8) Fix libbpf gen_loader error handling wrt fd cleanup, from Kumar Kartikeya Dwivedi.

* https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  udp: Validate checksum in udp_read_sock()
  bpf: Fix toctou on read-only map's constant scalar tracking
  samples/bpf: Fix build error due to -isystem removal
  selftests/bpf: Add tests for restricted helpers
  bpf: Forbid bpf_ktime_get_coarse_ns and bpf_timer_* in tracing progs
  libbpf: Perform map fd cleanup for gen_loader in case of error
  samples/bpf: Fix incorrect use of strlen in xdp_redirect_cpu
  tools/runqslower: Fix cross-build
  samples/bpf: Fix summary per-sec stats in xdp_sample_user
  selftests/bpf: Check map in map pruning
  bpf: Fix inner map state pruning regression.
  xsk: Fix crash on double free in buffer pool
====================

Link: https://lore.kernel.org/r/20211116141134.6490-1-daniel@iogearbox.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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