Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add dslsdzc/rev-skills --skill re-format-elfgit clone --depth 1 https://github.com/dslsdzc/rev-skillsWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/dslsdzc/rev-skills/re-format-elf)<a href="https://agentmods.dev/skills/dslsdzc/rev-skills/re-format-elf"><img src="https://agentmods.dev/badge/skills/dslsdzc/rev-skills/re-format-elf/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/dslsdzc/rev-skills/re-format-elf"><img src="https://agentmods.dev/badge/skills/dslsdzc/rev-skills/re-format-elf.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00045 | $0.03412 |
| Opus 5 | $0.00023 | $0.01706 |
| Sonnet 5 | $0.00009 | $0.00682 |
| Haiku 4.5 | $0.00005 | $0.00341 |
Grade A, and why
re-format-elf scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 9d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 138 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ELF 格式解析
何时使用 / 何时不用
- 用：目标是 Linux ELF 可执行文件或 .so 共享库，需要理解结构、看 .init_array、GOT/PLT 与符号、评估安全属性
- 不用：PE（走 [[re-format-pe]]）、Mach-O（走 [[re-format-macho]]）；裸二进制固件（非标准 ELF，走 [[re-firmware]] 域）
- 不用：只需函数逻辑（直接反编译技能）
工具准备
参考 [[platform-tips]]——ELF 目标多为 Linux 本地分析；跨架构（ARM/MIPS 固件 ELF）可用 QEMU 用户态仿真，静态分析无需沙箱。
readelf（binutils）
- Linux:
apt install binutils/dnf install binutils/pacman -S binutils - macOS:
brew install binutils（greadelf） - WSL: Linux 版
- 验证:
readelf --version
objdump（binutils）
- 同上（macOS 为
gobjdump） - 验证:
objdump -V
elfutils（eu-* 工具族）
- Linux:
apt install elfutils/dnf install elfutils/pacman -S elfutils - macOS:
brew install elfutils（eu-readelf等） - 验证:
eu-readelf -h /bin/ls
patchelf（修改 ELF 头/加载器）
- Linux:
apt install patchelf/dnf install patchelf/pacman -S patchelf - macOS:
brew install patchelf - 验证:
patchelf --version - 用途: 分析辅助（改 RPATH/解释器）与修复，分析时先只读
操作步骤
-
readelf 三表（ehdr/phdr/shdr）：
readelf -h sample # ELF 头: Class/Machine/Entry/Type readelf -l sample # program headers（段→装载偏移，动态加载与 GNU_STACK 在这里） readelf -S sample # section headers（节→地址/大小/标志）三表对照:
-h给入口点，-l给运行时内存布局，-S给静态节视图。 -
结构速览（ehdr/phdr/shdr 布局）：ELF 文件 = 头 + 程序头表 + 节区 + 节头表；64 位下 ehdr 64 字节、phdr 56 字节/条、shdr 64 字节/条。ehdr 关键字段与偏移：
0x00 e_ident[16] magic(7F 45 4C 46)+class(0x04:1=32位/2=64位)+data(0x05)+OSABI(0x07) 0x10 e_type 1=REL 2=EXEC 3=DYN(PIE/so) 4=CORE 0x12 e_machine 62=x86-64 3=i386 183=AArch64 243=RISC-V 8=MIPS 0x18 e_entry 入口点 0x20 e_phoff 程序头表偏移 0x28 e_shoff 节头表偏移 0x34 e_ehsize 64（32 位为 52） 0x38 e_phnum | 0x3A e_shentsize | 0x3C e_shnum | 0x3E e_shstrndx三表关系:
readelf -h输出的每个字段都能在文件前 64 字节里手工核对（xxd -l 64）；程序头描述"哪些文件区段按什么权限/对齐映射到内存"，节头描述"文件里的符号/字符串/代码等命名区段"。字段全表与布局图见 [[layout]]。 -
.init_array / .fini_array（main 之前执行）：
readelf -S sample | grep -i init_array readelf -a sample | grep -A5 -i 'init_array' objdump -d -j .init_array sample # 逐条反汇编回调地址.init_array中的函数指针在 main 之前按序执行——初始化/反调试/解密常藏在这里，必须最先查。
What ships with it
2 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 9d ago First seen · 138 lines · 45 tokens per session scan A 080b529a3427
re-format-elf is a skill published in the GitHub repository dslsdzc/rev-skills (50 stars, last pushed 11d ago), licensed Apache-2.0. It adds 45 tokens to every session and 3,412 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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