NAME¶
seccomp_arch_add, seccomp_arch_remove, seccomp_arch_exist, seccomp_arch_native -
Manage seccomp filter architectures
SYNOPSIS¶
#include <seccomp.h>
typedef void * scmp_filter_ctx;
#define SCMP_ARCH_NATIVE
#define SCMP_ARCH_X86
#define SCMP_ARCH_X86_64
uint32_t seccomp_arch_native();
int seccomp_arch_exist(const scmp_filter_ctx ctx, uint32_t arch_token);
int seccomp_arch_add(scmp_filter_ctx ctx, uint32_t arch_token);
int seccomp_arch_remove(scmp_filter_ctx ctx, uint32_t arch_token);
Link with -lseccomp.
DESCRIPTION¶
The
seccomp_arch_exist() function tests to see if a given architecture
has been added to the seccomp filter in
ctx , where the
seccomp_arch_add() and
seccomp_arch_remove() add and remove,
respectively, architectures from the seccomp filter. In all three functions,
the architecture values given in
arch_token should be the
SCMP_ARCH_* defined constants; with the
SCMP_ARCH_NATIVE
constant always referring to the native compiled architecture. The
seccomp_arch_native() function returns the system's architecture such
that it will match one of the
SCMP_ARCH_* constants.
When a seccomp filter is initialized with the call to
seccomp_init(3) the
native architecture is automatically added to the filter. If you want to
remove the native architecture from the filter, you first need to add another
architecture to the filter as a seccomp filter must contain at least one
architecture at all times. After you have added a second architecture to the
seccomp filter, you can remove the native architecture.
When adding a new architecture to an existing filter, the existing rules will
not be added to the new architecture. However, rules added after adding the
new architecture will be added to all of the architectures in the filter.
RETURN VALUE¶
The
seccomp_arch_add() and
seccomp_arch_remove() functions return
zero on success, negative errno values on failure. The
seccomp_arch_exist() function returns zero if the architecture exists,
-EEXIST if it does not, and other 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_KILL);
if (ctx == NULL)
goto out;
if (seccomp_arch_exist(ctx, SCMP_ARCH_X86) == -EEXIST) {
rc = seccomp_arch_add(ctx, SCMP_ARCH_X86);
if (rc != 0)
goto out_all;
rc = seccomp_arch_remove(ctx, SCMP_ARCH_NATIVE);
if (rc != 0)
goto out_all;
}
/* ... */
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),
seccom_merge(3)