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Subject: Re: [PATCH bpf] bpf, arm64: fix trampoline for BPF_TRAMP_F_CALL_ORIG
From: patchwork-bot+netdevbpf@kernel.org
Message-Id: 
 <172071363122.25248.13927897511832402439.git-patchwork-notify@kernel.org>
Date: Thu, 11 Jul 2024 16:00:31 +0000
References: <20240711151838.43469-1-puranjay@kernel.org>
In-Reply-To: <20240711151838.43469-1-puranjay@kernel.org>
To: Puranjay Mohan <puranjay@kernel.org>
Cc: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org,
 martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org,
 yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org,
 sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, puranjay12@gmail.com,
 xukuohai@huaweicloud.com, catalin.marinas@arm.com, will@kernel.org,
 jean-philippe@linaro.org, bpf@vger.kernel.org,
 linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@iogearbox.net>:

On Thu, 11 Jul 2024 15:18:38 +0000 you wrote:
> When BPF_TRAMP_F_CALL_ORIG is set, the trampoline calls
> __bpf_tramp_enter() and __bpf_tramp_exit() functions, passing them the
> struct bpf_tramp_image *im pointer as an argument in R0.
> 
> The trampoline generation code uses emit_addr_mov_i64() to emit
> instructions for moving the bpf_tramp_image address into R0, but
> emit_addr_mov_i64() assumes the address to be in the vmalloc() space and
> uses only 48 bits. Because bpf_tramp_image is allocated using kzalloc(),
> its address can use more than 48-bits, in this case the trampoline
> will pass an invalid address to __bpf_tramp_enter/exit() causing a
> kernel crash.
> 
> [...]

Here is the summary with links:
  - [bpf] bpf, arm64: fix trampoline for BPF_TRAMP_F_CALL_ORIG
    https://git.kernel.org/bpf/bpf-next/c/19d3c179a377

You are awesome, thank you!
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