NAME

PR_SET_MM - modify kernel memory map descriptor fields

LIBRARY

Standard C library (libc, -lc)

SYNOPSIS

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

int prctl(PR_SET_MM, long op, ...);

DESCRIPTION

Modify certain kernel memory map descriptor fields of the calling process. Usually these fields are set by the kernel and dynamic loader (see ld.so(8) for more information) and a regular application should not use this feature. However, there are cases, such as self-modifying programs, where a program might find it useful to change its own memory map.

The calling process must have the CAP_SYS_RESOURCE capability. The value in op is one of the options below.

PR_SET_MM_START_CODE

PR_SET_MM_END_CODE

PR_SET_MM_START_DATA

PR_SET_MM_END_DATA

PR_SET_MM_START_STACK

PR_SET_MM_START_BRK

PR_SET_MM_BRK

PR_SET_MM_ARG_START

PR_SET_MM_ARG_END

PR_SET_MM_ENV_START

PR_SET_MM_ENV_END

PR_SET_MM_AUXV

PR_SET_MM_EXE_FILE

PR_SET_MM_MAP

PR_SET_MM_MAP_SIZE

RETURN VALUE

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

ERRORS

EINVAL

op is not a valid value.

EPERM

The caller does not have the CAP_SYS_RESOURCE capability.

STANDARDS

Linux.

HISTORY

Linux 3.3.

Before Linux 3.10, this feature is available only if the kernel is built with the CONFIG_CHECKPOINT_RESTORE option enabled.

SEE ALSO

prctl(2), PR_SET_MM_START_CODE(2const), PR_SET_MM_END_CODE(2const), PR_SET_MM_START_DATA(2const), PR_SET_MM_END_DATA(2const), PR_SET_MM_START_STACK(2const), PR_SET_MM_START_BRK(2const), PR_SET_MM_BRK(2const), PR_SET_MM_ARG_START(2const), PR_SET_MM_ARG_END(2const), PR_SET_MM_ENV_START(2const), PR_SET_MM_ENV_END(2const), PR_SET_MM_EXE_FILE(2const), PR_SET_MM_MAP(2const), PR_SET_MM_MAP_SIZE(2const)