seccomp_merge(3) — Linux manual page


seccomp_merge(3)          libseccomp Documentation          seccomp_merge(3)

NAME         top

       seccomp_merge - Merge two seccomp filters

SYNOPSIS         top

       #include <seccomp.h>

       typedef void * scmp_filter_ctx;

       int seccomp_merge(scmp_filter_ctx dst, scmp_filter_ctx src);

       Link with -lseccomp.

DESCRIPTION         top

       The seccomp_merge() function merges the seccomp filter in src with
       the filter in dst and stores the resulting in the dst filter.  If
       successful, the src seccomp filter is released and all internal
       memory associated with the filter is freed; there is no need to call
       seccomp_release(3) on src and the caller should discard any
       references to the filter.

       In order to merge two seccomp filters, both filters must have the
       same attribute values and no overlapping architectures.

RETURN VALUE         top

       Returns zero on success or one of the following error codes on

       -EDOM  Unable to merge the filters due to architecture issues, e.g.
              byte endian mismatches.

              The architecture already exists in the filter.

              One of the filters is invalid.

              The library was unable to allocate enough memory.

EXAMPLES         top

       #include <seccomp.h>

       int main(int argc, char *argv[])
            int rc = -1;
            scmp_filter_ctx ctx_32, ctx_64;

            ctx_32 = seccomp_init(SCMP_ACT_KILL);
            if (ctx_32 == NULL)
                 goto out_all;
            ctx_64 = seccomp_init(SCMP_ACT_KILL);
            if (ctx_64 == NULL)
                 goto out_all;

            if (seccomp_arch_exist(ctx_32, SCMP_ARCH_X86) == -EEXIST) {
                 rc = seccomp_arch_add(ctx_32, SCMP_ARCH_X86);
                 if (rc != 0)
                      goto out_all;
                 rc = seccomp_arch_remove(ctx_32, SCMP_ARCH_NATIVE);
                 if (rc != 0)
                      goto out_all;
            if (seccomp_arch_exist(ctx_64, SCMP_ARCH_X86_64) == -EEXIST) {
                 rc = seccomp_arch_add(ctx_64, SCMP_ARCH_X86_64);
                 if (rc != 0)
                      goto out_all;
                 rc = seccomp_arch_remove(ctx_64, SCMP_ARCH_NATIVE);
                 if (rc != 0)
                      goto out_all;

            /* ... */

            rc = seccomp_merge(ctx_64, ctx_32);
            if (rc != 0)
                 goto out_all;

            /* NOTE: the 'ctx_32' filter is no longer valid at this point */

            /* ... */

            return -rc;
            goto out;

NOTES         top

       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  This tool, as well as the
       libseccomp library, is currently under development, please report any
       bugs at the project site or directly to the author.

AUTHOR         top

       Paul Moore <>

SEE ALSO         top

       seccomp_init(3), seccomp_reset(3), seccomp_arch_add(3),
       seccomp_arch_remove(3), seccomp_attr_get(3), seccomp_attr_set(3)

COLOPHON         top

       This page is part of the libseccomp (high-level API to the Linux
       Kernel's seccomp filter) project.  Information about the project can
       be found at ⟨⟩.  If you have a
       bug report for this manual page, see
       ⟨⟩.  This page was
       obtained from the project's upstream Git repository
       ⟨⟩ on 2020-09-18.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-09-15.)  If you discover any rendering problems in
       this HTML version of the page, or you believe there is a better or
       more up-to-date source for the page, or you have corrections or
       improvements to the information in this COLOPHON (which is not part
       of the original manual page), send a mail to              30 May 2020                seccomp_merge(3)

Pages that refer to this page: seccomp_arch_add(3)seccomp_arch_exist(3)seccomp_arch_native(3)seccomp_arch_remove(3)seccomp_arch_resolve_name(3)