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description/tools: zero initialization for stack variables

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Cheng Jian
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@@ -63,9 +63,15 @@ blogexcerpt: 虚拟化 & KVM 子系统
# 2 编译
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## 2.1 zero initialization for stack variables
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| 时间 | 作者 | 特性 | 描述 | 是否合入主线 | 链接 |
|:----:|:----:|:---:|:----:|:---------:|:----:|
| 2020/06/14 | Alexander Potapenko <glider@google.com> | [security: allow using Clang's zero initialization for stack variables](https://lore.kernel.org/patchwork/cover/1255765) | 支持 clang 的局部变量零初始化. 通过 CONFIG_INIT_STACK_ALL_ZERO 来启用, clang 可以通过选项 `-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang` 来保证未初始化局部变量初始化为 0. | RFC v2 ☑ 5.9-rc1 | [PatchWork v2,RFC](https://lore.kernel.org/patchwork/cover/1255765)<br>*-*-*-*-*-*-*-* <br>[PatchWork RFC](https://lore.kernel.org/patchwork/patch/1256566) |
| 2019/01/23 | Kees Cook <keescook@chromium.org> | [gcc-plugins: Introduce stackinit plugin](https://patchwork.kernel.org/project/linux-kbuild/cover/20190123110349.35882-1-keescook@chromium.org) | 使用 GCC 编译内核时, 提供插件来实现早期提议的 gcc 选项 [`-finit-local-vars`](https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00615.html)(未被 GNU/gcc 社区接纳)类似的功能, 以实现[未初始化局部变量初始化为 0 的诉求](https://gcc.gnu.org/ml/gcc-patches/2014-06/msg00615.html). 通过 CONFIG_GCC_PLUGIN_STACKINIT 来开启. | v1 ☐ | [PatchWork](https://patchwork.kernel.org/project/linux-kbuild/cover/20190123110349.35882-1-keescook@chromium.org) |
| 2019/04/10 | Kees Cook <keescook@chromium.org> | [security: Implement Clang's stack initialization](https://patchwork.kernel.org/project/linux-kbuild/cover/20190423194925.32151-1-keescook@chromium.org) | clang 中提供了 `-ftrivial-auto-var-init` 来进行未初始化局部变量的默认初始化, 引入 CONFIG_INIT_STACK_ALL 来为内核开启此选项, 这比 CONFIG_GCC_PLUGINS_STRUCTLEAK_BYREF_ALL 的覆盖更广. 当启用 CONFIG_INIT_STACK_ALL 时, 当前补丁仅使用 "pattern" 模式. 开发人员可以通过使用 `__attribute__((uninitialized))` 在每个变量的基础上选择不使用该特性. | v1 ☑ 5.2-rc1 | [PatchWork v1,3/3](https://patchwork.kernel.org/project/linux-kbuild/patch/20190410161612.18545-4-keescook@chromium.org)<br>*-*-*-*-*-*-*-* <br>[PatchWork v2,3/3](https://patchwork.kernel.org/project/linux-kbuild/patch/20190411180117.27704-4-keescook@chromium.org)<br>*-*-*-*-*-*-*-* <br>[PatchWork v3,3/3](https://patchwork.kernel.org/project/linux-kbuild/patch/20190423194925.32151-4-keescook@chromium.org), [commit](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=709a972efb01efaeb97cad1adc87fe400119c8ab) |
| 2020/06/14 | Alexander Potapenko <glider@google.com> | [security: allow using Clang's zero initialization for stack variables](https://lore.kernel.org/patchwork/cover/1255765) | 支持 clang 的局部变量零初始化. 通过 CONFIG_INIT_STACK_ALL_ZERO 来启用, clang 可以通过选项 `-ftrivial-auto-var-init=zero -enable-trivial-auto-var-init-zero-knowing-it-will-be-removed-from-clang` 来保证未初始化局部变量初始化为 0. | RFC v2 ☑ 5.9-rc1 | [PatchWork v2,RFC](https://lore.kernel.org/patchwork/cover/1255765)<br>*-*-*-*-*-*-*-* <br>[PatchWork RFC](https://lore.kernel.org/patchwork/patch/1256566), [commit](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=f0fe00d4972a8cd4b98cc2c29758615e4d51cdfe) |
| 2021/02/18 | NA | [security: allow using Clang's zero initialization for stack variables](https://lore.kernel.org/patchwork/cover/1255765) | gcc 也引入了 [Auto Initialize Automatic Variables](https://www.phoronix.com/scan.php?page=news_item&px=GCC-12-Auto-Var-Init) 通过 `-ftrivial-auto-var-init` 选项将未初始化的[变量默认初始化为 0](https://gcc.gnu.org/pipermail/gcc-patches/2021-February/565514.html). | RFC v2 ☑ 5.9-rc1 | NA |
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