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       landlock_create_ruleset - create a new Landlock ruleset


       Standard C library (libc, -lc)


       #include <linux/landlock.h>  /* Definition of LANDLOCK_* constants */
       #include <sys/syscall.h>     /* Definition of SYS_* constants */

       int syscall(SYS_landlock_create_ruleset,
                   const struct landlock_ruleset_attr *attr,
                   size_t size , uint32_t flags);


       A  Landlock  ruleset  identifies  a  set  of  rules  (i.e.,  actions  on  objects).   This
       landlock_create_ruleset() system call enables creating a new file descriptor identifying a
       ruleset.    This   file   descriptor   can   then  be  used  by  landlock_add_rule(2)  and
       landlock_restrict_self(2).  See landlock(7) for a global overview.

       attr specifies the properties of the new ruleset.  It points to the following structure:

                  struct landlock_ruleset_attr {
                      __u64 handled_access_fs;

              handled_access_fs is a bitmask of actions that  is  handled  by  this  ruleset  and
              should  then be forbidden if no rule explicitly allows them (see Filesystem actions
              in landlock(7)).  This enables simply  restricting  ambient  rights  (e.g.,  global
              filesystem access) and is needed for compatibility reasons.

       size must be specified as sizeof(struct landlock_ruleset_attr) for compatibility reasons.

       flags must be 0 if attr is used.  Otherwise, flags can be set to:

              If  attr  is  NULL  and size is 0, then the returned value is the highest supported
              Landlock ABI version (starting at 1).  This version can be used for  a  best-effort
              security  approach, which is encouraged when user space is not pinned to a specific
              kernel version.  All features documented in these man pages are available with  the
              version 1.


       On success, landlock_create_ruleset() returns a new Landlock ruleset file descriptor, or a
       Landlock ABI version, according to flags.


       landlock_create_ruleset() can fail for the following reasons:

              Landlock is supported by the kernel but disabled at boot time.

       EINVAL Unknown flags, or unknown access, or too small size.

       E2BIG  size is too big.

       EFAULT attr was not a valid address.

       ENOMSG Empty accesses (i.e., attr->handled_access_fs is 0).


       Landlock was added in Linux 5.13.


       This system call is Linux-specific.


       See landlock(7).


       landlock_add_rule(2), landlock_restrict_self(2), landlock(7)