PR_SET_DUMPABLE(2const) - Linux manual page (original) (raw)

PRSETDUMPABLE(2const) PRSETDUMPABLE(2const)

NAME top

   PR_SET_DUMPABLE - set the "dumpable" attribute of 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_DUMPABLE, long** _dumpable_**);**

DESCRIPTION top

   Set the state of the "dumpable" attribute, which determines
   whether core dumps are produced for the calling process upon
   delivery of a signal whose default behavior is to produce a core
   dump.

   _dumpable_ must be either **0L** (**SUID_DUMP_DISABLE**, process is not
   dumpable) or **1L** (**SUID_DUMP_USER**, process is dumpable).

   Normally, the "dumpable" attribute is set to 1.  However, it is
   reset to the current value contained in the file _/proc/sys/fs/_
   _suiddumpable_ (which by default has the value 0), in the following
   circumstances:

   •  The process's effective user or group ID is changed.

   •  The process's filesystem user or group ID is changed (see
      [credentials(7)](../man7/credentials.7.html)).

   •  The process executes ([execve(2)](../man2/execve.2.html)) a set-user-ID or set-group-ID
      program, resulting in a change of either the effective user ID
      or the effective group ID.

   •  The process executes ([execve(2)](../man2/execve.2.html)) a program that has file
      capabilities (see [capabilities(7)](../man7/capabilities.7.html)), but only if the permitted
      capabilities gained exceed those already permitted for the
      process.

   Processes that are not dumpable can not be attached via [ptrace(2)](../man2/ptrace.2.html)
   **PTRACE_ATTACH**; see [ptrace(2)](../man2/ptrace.2.html) for further details.

   If a process is not dumpable, the ownership of files in the
   process's _/proc/_pid directory is affected as described in
   [proc_pid(5)](../man5/proc%5Fpid.5.html).

RETURN VALUE top

   On success, 0 is returned.  On error, -1 is returned, and _[errno](../man3/errno.3.html)_ is
   set to indicate the error.

ERRORS top

   **EINVAL** _arg2_ is neither **SUID_DUMP_DISABLE** nor **SUID_DUMP_USER**.

FILES top

   _/proc/sys/fs/suiddumpable_

   _/proc/_pid_/_

STANDARDS top

   Linux.

HISTORY top

   Linux 2.3.20.

   Between Linux 2.6.13 and Linux 2.6.17, the value **2L** was also
   permitted, which caused any binary which normally would not be
   dumped to be dumped readable by root only; for security reasons,
   this feature has been removed.  (See also the description of
   _/proc/sys/fs/suiddumpable_ in [proc_sys_fs(5)](../man5/proc%5Fsys%5Ffs.5.html).)

SEE ALSO top

   [prctl(2)](../man2/prctl.2.html), [PR_SET_DUMPABLE(2const)](../man2/PR%5FSET%5FDUMPABLE.2const.html)

COLOPHON top

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Linux man-pages 6.10 2024-07-23 PRSETDUMPABLE(2const)

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