NAME

       seccomp_attr_set, seccomp_attr_get - Manage the seccomp filter attributes

SYNOPSIS

       #include <seccomp.h>

       typedef void * scmp_filter_ctx;
       enum scmp_filter_attr;

       int seccomp_attr_set(scmp_filter_ctx ctx,
                            enum scmp_filter_attr attr, uint32_t value);
       int seccomp_attr_get(scmp_filter_ctx ctx,
                            enum scmp_filter_attr attr, uint32_t *value);

       Link with -lseccomp.

DESCRIPTION

       The seccomp_attr_set() function sets the different seccomp filter attributes while the seccomp_attr_get()
       function fetches the filter attributes.  The seccomp filter attributes are tunable values that affect how
       the  library  behaves when generating and loading the seccomp filter into the kernel.  The attributes are
       reset to their default values whenever the filter is initialized or reset via  seccomp_filter_init(3)  or
       seccomp_filter_reset(3).

       The filter context ctx is the value returned by the call to seccomp_init(3).

       Valid attr values are as follows:

       SCMP_FLTATR_ACT_DEFAULT
              The   default   filter   action   as   specified   in   the   call  to  seccomp_filter_init(3)  or
              seccomp_filter_reset(3).  This attribute is read-only.

       SCMP_FLTATR_ACT_BADARCH
              The filter action taken when the loaded filter does not match the architecture  of  the  executing
              application.  Defaults to the SCMP_ACT_KILL action.

       SCMP_FLTATR_CTL_NNP
              A  flag  to specify if the NO_NEW_PRIVS functionality should be enabled before loading the seccomp
              filter into the kernel.  If set to off ( value == 0) then loading  the  seccomp  filter  into  the
              kernel will fail if CAP_SYS_ADMIN is not set.  Defaults to on ( value == 1).

RETURN VALUE

       Returns zero on success, negative errno values on failure.

EXAMPLES

       #include <seccomp.h>

       int main(int argc, char *argv[])
       {
            int rc = -1;
            scmp_filter_ctx ctx;

            ctx = seccomp_init(SCMP_ACT_ALLOW);
            if (ctx == NULL)
                 goto out;

            /* ... */

            rc = seccomp_attr_set(ctx, SCMP_FLTATR_ACT_BADARCH, SCMP_ACT_TRAP);
            if (rc < 0)
                 goto out;

            /* ... */

       out:
            seccomp_release(ctx);
            return -rc;
       }

NOTES

       While  the  seccomp filter can be generated independent of the kernel, kernel support is required to load
       and enforce the seccomp filter generated by libseccomp.

       The libseccomp project site, with more information and the  source  code  repository,  can  be  found  at
       http://libseccomp.sf.net.   This  library  is  currently under development, please report any bugs at the
       project site or directly to the author.

AUTHOR

       Paul Moore <paul@paul-moore.com>

SEE ALSO

       seccomp_init(3), seccomp_reset(3), seccomp_load(3)

paul@paul-moore.com                               25 July 2012                               seccomp_attr_set(3)