NAME

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

LIBRARY

       Standard C library (libc, -lc)

SYNOPSIS

       #include <linux/prctl.h>  /* Definition of PR_* constants */
       #include <sys/prctl.h>

       int prctl(PR_SET_PTRACER, long pid);

DESCRIPTION

       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.

RETURN VALUE

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

ERRORS

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

STANDARDS

       Linux.

HISTORY

       Linux 3.4.

SEE ALSO

       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).