NAME

PR_SET_SECCOMP - set the secure computing mode

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

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

[[deprecated]]
int prctl(PR_SET_SECCOMP, long mode, ...);

[[deprecated]]
int prctl(PR_SET_SECCOMP, SECCOMP_MODE_STRICT);
[[deprecated]]
int prctl(PR_SET_SECCOMP, SECCOMP_MODE_FILTER,
          struct sock_fprog *filter);

DESCRIPTION

Set the secure computing (seccomp) mode for the calling thread, to limit the available system calls. The more recent seccomp(2) system call provides a superset of the functionality of PR_SET_SECCOMP, and is the preferred interface for new applications.

The seccomp mode is selected via mode. The seccomp constants are defined in <linux/seccomp.h>. The following values can be specified:

SECCOMP_MODE_STRICT (since Linux 2.6.23)

See the description of SECCOMP_SET_MODE_STRICT in seccomp(2).

This operation is available only if the kernel is configured with CONFIG_SECCOMP enabled.

SECCOMP_MODE_FILTER (since Linux 3.5)

The allowed system calls are defined by a pointer to a Berkeley Packet Filter passed in filter. It can be designed to filter arbitrary system calls and system call arguments. See the description of SECCOMP_SET_MODE_FILTER in seccomp(2).

This operation is available only if the kernel is configured with CONFIG_SECCOMP_FILTER enabled.

RETURN VALUE

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

ERRORS

EACCES

mode is SECCOMP_MODE_FILTER, but the process does not have the CAP_SYS_ADMIN capability or has not set the no_new_privs attribute (see PR_SET_NO_NEW_PRIVS(2const)).

EFAULT

mode is SECCOMP_MODE_FILTER, and filter is an invalid address.

EINVAL

mode is not a valid value.

EINVAL

The kernel was not configured with CONFIG_SECCOMP.

EINVAL

mode is SECCOMP_MODE_FILTER, and the kernel was not configured with CONFIG_SECCOMP_FILTER.

STANDARDS

Linux.

HISTORY

Linux 2.6.23.

SEE ALSO

prctl(2), PR_GET_SECCOMP(2const), seccomp(2)