разрешить имя системного вызова (resolve a syscall name)
Имя (Name)
seccomp_syscall_resolve_name - Resolve a syscall name
Синопсис (Synopsis)
#include <seccomp.h>
int seccomp_syscall_resolve_name(const char *name);
int seccomp_syscall_resolve_name_arch(uint32_t arch_token,
const char *name);
int seccomp_syscall_resolve_name_rewrite(uint32_t arch_token,
const char *name);
char *seccomp_syscall_resolve_num_arch(uint32_t arch_token, int num);
Link with -lseccomp.
Описание (Description)
The seccomp_syscall_resolve_name(),
seccomp_syscall_resolve_name_arch(), and
seccomp_syscall_resolve_name_rewrite() functions resolve the
commonly used syscall name to the syscall number used by the
kernel and the rest of the libseccomp API, with
seccomp_syscall_resolve_name_rewrite() rewriting the syscall
number for architectures that modify the syscall. Syscall
rewriting typically happens in case of a multiplexed syscall,
like socketcall(2) or ipc(2) on x86.
seccomp_syscall_resolve_num_arch() function resolves the syscall
number used by the kernel to the commonly used syscall name.
The caller is responsible for freeing the returned string from
seccomp_syscall_resolve_num_arch().
Возвращаемое значение (Return value)
In the case of seccomp_syscall_resolve_name(),
seccomp_syscall_resolve_name_arch(), and
seccomp_syscall_resolve_name_rewrite() the associated syscall
number is returned, with the negative pseudo syscall number being
returned in cases where the given syscall does not exist for the
architecture. The value __NR_SCMP_ERROR is returned in case of
error. In all cases, the return value is suitable for use in any
libseccomp API function which requires the syscall number,
examples include seccomp_rule_add() and seccomp_rule_add_exact().
In the case of seccomp_syscall_resolve_num_arch() the associated
syscall name is returned and it remains the callers
responsibility to free the returned string via free(3).
Примеры (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;
/* ... */
rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW,
seccomp_syscall_resolve_name("open"), 0);
if (rc < 0)
goto out;
/* ... */
rc = seccomp_load(ctx);
if (rc < 0)
goto out;
/* ... */
out:
seccomp_release(ctx);
return -rc;
}
Примечание (Note)
In case of bare syscalls implemented on top of a multiplexed
syscall, seccomp_syscall_resolve_name() and
seccomp_syscall_resolve_name_arch() can be used to verify if a
bare syscall is implemented for a specific architecture, while
seccomp_syscall_resolve_name_rewrite() can be used to determine
the underlying multiplexed syscall.
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
https://github.com/seccomp/libseccomp. 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.
