PR_SET_PTRACER - allow processes to ptrace(2) the calling process

This is meaningful only when the Yama LSM is enabled and in mode 1 ("restricted ptrace", visible via /proc/sys/kernel/yama/ptrace_scope). When a "ptracer process ID" is passed in pid, the caller is declaring that the ptracer process can ptrace(2) the calling process as if it were a direct process ancestor. Each PR_SET_PTRACER operation replaces the previous "ptracer process ID". Employing PR_SET_PTRACER with pid set to 0 clears the caller's "ptracer process ID". If pid is PR_SET_PTRACER_ANY, the ptrace restrictions introduced by Yama are effectively disabled for the calling process.

EINVALpid is not 0, PR_SET_PTRACER_ANY, nor the PID of an existing process.

Linux 3.4.

Standard C library (libc, -lc)

PR_SET_PTRACER - allow processes to ptrace(2) the calling process

On success, 0 is returned. On error, -1 is returned, and errno is set to indicate the error.

prctl(2), For further information, see the kernel source file Documentation/admin-guide/LSM/Yama.rst (or Documentation/security/Yama.txt before Linux 4.13). Linux man-pages 6.9.1 2024-06-02 PR_SET_PTRACER(2const)

Linux.

#include<linux/prctl.h> /* Definition of PR_* constants */ #include<sys/prctl.h>intprctl(PR_SET_PTRACER,longpid);