linux-kernel - Re: [PATCH] bpf: Reject BPF_MAP_TYPE_INSN_ARRAY in check_reg_const

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Message-Id: 
 <176784180655.3106398.6242918844189045898.git-patchwork-notify@kernel.org>
Date: Thu, 08 Jan 2026 03:10:06 +0000
From: patchwork-bot+netdevbpf@...nel.org
To: Deepanshu Kartikey <kartikey406@...il.com>
Cc: ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
 andrii@...nel.org, martin.lau@...ux.dev, eddyz87@...il.com, song@...nel.org,
 yonghong.song@...ux.dev, kpsingh@...nel.org, sdf@...ichev.me,
 haoluo@...gle.com, jolsa@...nel.org, a.s.protopopov@...il.com,
 bpf@...r.kernel.org, linux-kernel@...r.kernel.org,
 syzbot+2c29addf92581b410079@...kaller.appspotmail.com
Subject: Re: [PATCH] bpf: Reject BPF_MAP_TYPE_INSN_ARRAY in
 check_reg_const_str()

Hello:

This patch was applied to bpf/bpf.git (master)
by Alexei Starovoitov <ast@...nel.org>:

On Wed,  7 Jan 2026 07:40:37 +0530 you wrote:
> BPF_MAP_TYPE_INSN_ARRAY maps store instruction pointers in their
> ips array, not string data. The map_direct_value_addr callback for
> this map type returns the address of the ips array, which is not
> suitable for use as a constant string argument.
> 
> When a BPF program passes a pointer to an insn_array map value as
> ARG_PTR_TO_CONST_STR (e.g., to bpf_snprintf), the verifier's
> null-termination check in check_reg_const_str() operates on the
> wrong memory region, and at runtime bpf_bprintf_prepare() can read
> out of bounds searching for a null terminator.
> 
> [...]

Here is the summary with links:
  - bpf: Reject BPF_MAP_TYPE_INSN_ARRAY in check_reg_const_str()
    https://git.kernel.org/bpf/bpf/c/9df5fad801c5

You are awesome, thank you!
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