[PATCH 0/4] bpf: permit JIT allocations to be served outside the module region

[Ard Biesheuvel]

On arm64, modules are allocated from a 128 MB window which is close to
the core kernel, so that relative direct branches are guaranteed to be
in range (except in some KASLR configurations). Also, module_alloc()
is in charge of allocating KASAN shadow memory when running with KASAN
enabled.

This means that the way BPF reuses module_alloc()/module_memfree() is
undesirable on arm64 (and potentially other architectures as well),
and so this series refactors BPF's use of those functions to permit
architectures to change this behavior.

Patch #1 fixes a bug introduced during the merge window, where the new
alloc/free tracking does not account for memory that is freed by some
arch code.

Patch #2 refactors the freeing path so that architectures can switch to
something other than module_memfree().

Patch #3 does the same for module_alloc().

Patch #4 implements the new alloc/free overrides for arm64

Cc: Daniel Borkmann <daniel at iogearbox.net>
Cc: Alexei Starovoitov <ast at kernel.org>
Cc: Rick Edgecombe <rick.p.edgecombe at intel.com>
Cc: Eric Dumazet <eric.dumazet at gmail.com>
Cc: Jann Horn <jannh at google.com>
Cc: Kees Cook <keescook at chromium.org>

Cc: Jessica Yu <jeyu at kernel.org>
Cc: Arnd Bergmann <arnd at arndb.de>
Cc: Catalin Marinas <catalin.marinas at arm.com>
Cc: Will Deacon <will.deacon at arm.com>
Cc: Mark Rutland <mark.rutland at arm.com>
Cc: Ralf Baechle <ralf at linux-mips.org>
Cc: Paul Burton <paul.burton at mips.com>
Cc: James Hogan <jhogan at kernel.org>
Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org>
Cc: Paul Mackerras <paulus at samba.org>
Cc: Michael Ellerman <mpe at ellerman.id.au>
Cc: "David S. Miller" <davem at davemloft.net>
Cc: linux-arm-kernel at lists.infradead.org
Cc: linux-kernel at vger.kernel.org
Cc: linux-mips at linux-mips.org
Cc: linuxppc-dev at lists.ozlabs.org
Cc: sparclinux at vger.kernel.org
Cc: netdev at vger.kernel.org

Ard Biesheuvel (4):
  bpf: account for freed JIT allocations in arch code
  net/bpf: refactor freeing of executable allocations
  bpf: add __weak hook for allocating executable memory
  arm64/bpf: don't allocate BPF JIT programs in module memory

 arch/arm64/net/bpf_jit_comp.c     | 11 ++++++++++
 arch/mips/net/bpf_jit.c           |  7 ++-----
 arch/powerpc/net/bpf_jit_comp.c   |  7 ++-----
 arch/powerpc/net/bpf_jit_comp64.c | 12 +++--------
 arch/sparc/net/bpf_jit_comp_32.c  |  7 ++-----
 kernel/bpf/core.c                 | 22 ++++++++++----------
 6 files changed, 31 insertions(+), 35 deletions(-)

-- 
2.17.1