netdev - [PATCH bpf v2 0/2] bpf, fix for subprogs with tailcalls

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Date:   Wed,  7 Jul 2021 15:38:46 -0700
From:   John Fastabend <john.fastabend@...il.com>
To:     ast@...nel.org, daniel@...earbox.net, andriin@...com
Cc:     john.fastabend@...il.com, bpf@...r.kernel.org,
        netdev@...r.kernel.org
Subject: [PATCH bpf v2 0/2] bpf, fix for subprogs with tailcalls

This fixes a use-after-free when using subprogs and tailcalls and adds
a test case to trigger the use-after-free.

v2: original patch missed fixups needed in out label as Daniel caught 

John Fastabend (2):
  bpf: track subprog poke correctly, fix use-after-free
  bpf: selftest to verify mixing bpf2bpf calls and tailcalls with insn
    patch

 arch/x86/net/bpf_jit_comp.c                   |  4 ++
 include/linux/bpf.h                           |  1 +
 kernel/bpf/core.c                             |  7 ++-
 kernel/bpf/verifier.c                         | 45 ++++---------------
 .../selftests/bpf/prog_tests/tailcalls.c      | 36 ++++++++++-----
 .../selftests/bpf/progs/tailcall_bpf2bpf4.c   | 21 ++++++++-
 6 files changed, 65 insertions(+), 49 deletions(-)

-- 
2.17.1