seccomp_merge(3) libseccomp Documentation seccomp_merge(3)NAMEseccomp_merge - Merge two seccomp filters
SYNOPSIS
#include <seccomp.h>
typedef void * scmp_filter_ctx;
int seccomp_merge(scmp_filter_ctx dst, scmp_filter_ctx src);
Link with -lseccomp.
DESCRIPTION
The seccomp_merge() function merges the seccomp filter in src with the
filter in dst and stores the resulting in the dst filter. If success‐
full, the src seccomp filter is released and all internal memory asso‐
cated with the filter is freed; there is no need to call sec‐
comp_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
Returns zero on success and negative values on failure.
EXAMPLES
#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/* NOTE: the 'ctx_32' filter is no longer valid at this point */
/* ... */
out:
seccomp_release(ctx_64);
return -rc;
out_all:
seccomp_release(ctx_32);
goto out;
}
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 ALSOseccomp_init(3), seccomp_reset(3), seccomp_arch_add(3), sec‐
comp_arch_remove(3), seccomp_attr_get(3), seccomp_attr_set(3)paul@paul-moore.com 28 September 2012 seccomp_merge(3)
