seccomp_attr_set(3) [centos man page]

seccomp_attr_set(3)					     libseccomp Documentation					       seccomp_attr_set(3)

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_fil-
       ter_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 gen-
       erated 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)

Check Out this Related Man Page

seccomp_export_bpf(3)					     libseccomp Documentation					     seccomp_export_bpf(3)

NAME

       seccomp_export_bpf, seccomp_export_pfc - Export the seccomp filter

SYNOPSIS

       #include <seccomp.h>

       typedef void * scmp_filter_ctx;

       int seccomp_export_bpf(const scmp_filter_ctx ctx, int fd);
       int seccomp_export_pfc(const scmp_filter_ctx ctx, int fd);

       Link with -lseccomp.

DESCRIPTION

       The  seccomp_export_bpf()  and  seccomp_export_pfc() functions generate and output the current seccomp filter in either BPF (Berkley Packet
       Filter) or PFC (Pseudo Filter Code).  The output of seccomp_export_bpf() is suitable for loading into the kernel, while the output of  sec-
       comp_export_pfc()  is  human  readable and is intended primarily as a debugging tool for developers using libseccomp.  Both functions write
       the filter to the fd file descriptor.

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

       While the two output formats are guaranteed to be functionally equivalent for the given seccomp filter configuration, the  filter  instruc-
       tions, and their ordering, are not guaranteed to be the same in both the BPF and PFC formats.

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;
	    int filter_fd;

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

	    /* ... */

	    filter_fd = open("/tmp/seccomp_filter.bpf", O_WRONLY);
	    if (filter_fd == -1) {
		 rc = -errno;
		 goto out;
	    }

	    rc = seccomp_export_bpf(ctx, filter_fd);
	    if (rc < 0) {
		 close(filter_fd);
		 goto out;
	    }
	    close(filter_fd);

	    /* ... */

       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 gen-
       erated 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_release(3)

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

Linux and UNIX Man Pages

seccomp_attr_set(3) [centos man page]

Check Out this Related Man Page