[PATCH v3 0/3] Fix up bpf_jit_limit some more

[PATCH v3 0/3] Fix up bpf_jit_limit some more

[Lorenz Bauer]

Fix some inconsistencies of bpf_jit_limit on non-x86 platforms.
I've dropped exposing bpf_jit_current since we couldn't agree on
file modes, correct names, etc.

Lorenz Bauer (3):
  bpf: define bpf_jit_alloc_exec_limit for riscv JIT
  bpf: define bpf_jit_alloc_exec_limit for arm64 JIT
  bpf: prevent increasing bpf_jit_limit above max

 arch/arm64/net/bpf_jit_comp.c | 5 +++++
 arch/riscv/net/bpf_jit_core.c | 5 +++++
 include/linux/filter.h        | 1 +
 kernel/bpf/core.c             | 4 +++-
 net/core/sysctl_net_core.c    | 2 +-
 5 files changed, 15 insertions(+), 2 deletions(-)

-- 
2.30.2


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[PATCH v3 1/3] bpf: define bpf_jit_alloc_exec_limit for riscv JIT

[Lorenz Bauer]

Expose the maximum amount of useable memory from the riscv JIT.

Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
Acked-by: Luke Nelson <luke.r.nels@gmail.com>
---
 arch/riscv/net/bpf_jit_core.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c
index fed86f42dfbe..0fee2cbaaf53 100644
--- a/arch/riscv/net/bpf_jit_core.c
+++ b/arch/riscv/net/bpf_jit_core.c
@@ -166,6 +166,11 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
 	return prog;
 }
 
+u64 bpf_jit_alloc_exec_limit(void)
+{
+	return BPF_JIT_REGION_SIZE;
+}
+
 void *bpf_jit_alloc_exec(unsigned long size)
 {
 	return __vmalloc_node_range(size, PAGE_SIZE, BPF_JIT_REGION_START,
-- 
2.30.2


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Re: [PATCH v3 1/3] bpf: define bpf_jit_alloc_exec_limit for riscv JIT

[Björn Töpel]

On Thu, 14 Oct 2021 at 16:26, Lorenz Bauer <lmb@cloudflare.com> wrote:
>
> Expose the maximum amount of useable memory from the riscv JIT.
>
> Signed-off-by: Lorenz Bauer <lmb@cloudflare.com>
> Acked-by: Luke Nelson <luke.r.nels@gmail.com>

Acked-by: Björn Töpel <bjorn@kernel.org>

> ---
>  arch/riscv/net/bpf_jit_core.c | 5 +++++
>  1 file changed, 5 insertions(+)
>
> diff --git a/arch/riscv/net/bpf_jit_core.c b/arch/riscv/net/bpf_jit_core.c
> index fed86f42dfbe..0fee2cbaaf53 100644
> --- a/arch/riscv/net/bpf_jit_core.c
> +++ b/arch/riscv/net/bpf_jit_core.c
> @@ -166,6 +166,11 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *prog)
>         return prog;
>  }
>
> +u64 bpf_jit_alloc_exec_limit(void)
> +{
> +       return BPF_JIT_REGION_SIZE;
> +}
> +
>  void *bpf_jit_alloc_exec(unsigned long size)
>  {
>         return __vmalloc_node_range(size, PAGE_SIZE, BPF_JIT_REGION_START,
> --
> 2.30.2
>

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Re: [PATCH v3 0/3] Fix up bpf_jit_limit some more

[Alexei Starovoitov]

On Thu, Oct 14, 2021 at 7:26 AM Lorenz Bauer <lmb@cloudflare.com> wrote:
>
> Fix some inconsistencies of bpf_jit_limit on non-x86 platforms.
> I've dropped exposing bpf_jit_current since we couldn't agree on
> file modes, correct names, etc.

Applied to bpf tree. Seems more appropriate there.

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