session-keyring - Session shared process keyring


   The  session  keyring  is  a keyring used to anchor keys on behalf of a
   process.  It is typically created by the pam_keyinit module when a user
   logs in and a link will be added that refers to the user keyring.

   A  special  serial  number  value, KEY_SPEC_SESSION_KEYRING, is defined
   that can be used in lieu of the  calling  process's  session  keyring's
   actual serial number.

   From  the  keyctl utility, '@s' can be used instead of a numeric key ID
   in much the same way.

   A process's session keyring is inherited  across  clone(),  fork()  and
   vfork()  and  is  retained  across  execve()  -  even  when  the target
   executable is setuid or setgid.  The session keyring will be  destroyed
   when the last process that refers to it exits.

   If  a process doesn't have a session keyring when it is accessed, then,
   under certain circumstances, the user session keyring will be  attached
   as  the  session keyring and under others a new session keyring will be


   The keyutils library  provides  a  number  of  special  operations  for
   manipulating session keyrings:

          This  operation  allows  the  caller  to  change  their  session
          keyring.  The caller can  join  an  existing  keyring  by  name,
          create  a  new  keyring  of  the name given or ask the kernel to
          create a new session keyring with the name "_ses".

          This operation allows the caller to  set  the  parent  process's
          session  keyring to the same as their own.  For this to succeed,
          the parent process must have identical security  attributes  and
          must be single threaded.

   These operations are also exposed through the keyctl utility as:

          keyctl session
          keyctl session - [<prog> <arg1> <arg2> ...]
          keyctl session <name> [<prog> <arg1> <arg2> ...]


          keyctl new_session




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