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Dockerコンテナ内でのgdbエラー対応

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#概要
Dockerコンテナ内でgdbコマンドを使ってCプログラムのデバッグをしようとしたところ,以下のような
warning: Error disabling address space randomization: Operation not permitted
と怒られました.

(gdb) b 5
Breakpoint 1 at 0x117c: file test.c, line 5.
(gdb) r
Starting program: /home/user/dev/test 
warning: Error disabling address space randomization: Operation not permitted

予想がつくとは思いますが雑にいうと,gdbはシステムコールを利用しているが,コンテナの中からは権限が無いためホストマシンのデバイスにアクセスできないらしい.

#解決策
システムコールを許可してあげるオプションを付与してあげる.

  • docker run実行時
$ docker run -it --cap-add=SYS_PTRACE --security-opt="seccomp=unconfined" [CONTAINER_NAME] /bin/bash
  • docker-composeでの場合

service下に以下を書いてあげる.

docker-compose.yaml
    cap_add: 
      - "SYS_PTRACE"
    security_opt: 
      - "seccomp=unconfined"

#参考記事
https://sott0n.github.io/posts/docker_gdb/

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