PR_SET_NO_NEW_PRIVS

Standard C library (libc, -lc)

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

int prctl(PR_SET_NO_NEW_PRIVS, 1L, 0L, 0L, 0L);

Set the calling thread's no_new_privs attribute. With no_new_privs set to 1, execve(2) promises not to grant privileges to do anything that could not have been done without the execve(2) call (for example, rendering the set-user-ID and set-group-ID mode bits, and file capabilities non-functional).

Once set, the no_new_privs attribute cannot be unset. The setting of this attribute is inherited by children created by fork(2) and clone(2), and preserved across execve(2).

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

EINVAL

The second argument is not equal to 1L.

/proc/pid/status

Since Linux 4.10, the value of a thread's no_new_privs attribute can be viewed via the NoNewPrivs field in this file.

Linux.

Linux 3.5.

prctl(2), PR_GET_NO_NEW_PRIVS(2const), seccomp(2)

For more information, see the kernel source file Documentation/userspace-api/no_new_privs.rst.