PR_SET_MDWE(2const) — Linux manual page

PR_SET_MDWE(2const)                                   PR_SET_MDWE(2const)

NAME         top

       PR_SET_MDWE - set the Memory-Deny-Write-Execute protection mask
       for the calling process

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

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

       int prctl(PR_SET_MDWE, unsigned long mask, 0L, 0L, 0L);

DESCRIPTION         top

       Set the calling process' Memory-Deny-Write-Execute protection
       mask.  Once protection bits are set, they can not be changed.

       mask must be a bit mask of:

       PR_MDWE_REFUSE_EXEC_GAIN
              New memory mapping protections can't be writable and
              executable.  Non-executable mappings can't become
              executable.

       PR_MDWE_NO_INHERIT  (since Linux 6.6)
              Do not propagate MDWE protection to child processes on
              fork(2).  Setting this bit requires setting
              PR_MDWE_REFUSE_EXEC_GAIN too.

RETURN VALUE         top

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

ERRORS         top

       EINVAL mask is not a valid value.

STANDARDS         top

       Linux.

HISTORY         top

       Linux 6.3.

SEE ALSO         top

       prctl(2), PR_GET_MDWE(2const)

COLOPHON         top

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Linux man-pages 6.15            2025-05-17            PR_SET_MDWE(2const)

Pages that refer to this page: prctl(2),  PR_GET_MDWE(2const)

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