/*
* System call to query the rights mask associated with a capability.
*/
int
sys___cap_rights_get(struct thread *td, struct __cap_rights_get_args *uap)
{
struct filedesc *fdp;
cap_rights_t rights;
int error, fd, i, n;
if (uap->version != CAP_RIGHTS_VERSION_00)
return (EINVAL);
fd = uap->fd;
AUDIT_ARG_FD(fd);
fdp = td->td_proc->p_fd;
FILEDESC_SLOCK(fdp);
if (fget_locked(fdp, fd) == NULL) {
FILEDESC_SUNLOCK(fdp);
return (EBADF);
}
rights = *cap_rights(fdp, fd);
FILEDESC_SUNLOCK(fdp);
n = uap->version + 2;
if (uap->version != CAPVER(&rights)) {
/*
* For older versions we need to check if the descriptor
* doesn't contain rights not understood by the caller.
* If it does, we have to return an error.
*/
for (i = n; i < CAPARSIZE(&rights); i++) {
if ((rights.cr_rights[i] & ~(0x7FULL << 57)) != 0)
return (EINVAL);
}
}
error = copyout(&rights, uap->rightsp, sizeof(rights.cr_rights[0]) * n);
#ifdef KTRACE
if (error == 0 && KTRPOINT(td, KTR_STRUCT))
ktrcaprights(&rights);
#endif
return (error);
}
/*
* System call to limit rights of the given capability.
*/
int
sys_cap_rights_limit(struct thread *td, struct cap_rights_limit_args *uap)
{
cap_rights_t rights;
int error, version;
cap_rights_init(&rights);
error = copyin(uap->rightsp, &rights, sizeof(rights.cr_rights[0]));
if (error != 0)
return (error);
version = CAPVER(&rights);
if (version != CAP_RIGHTS_VERSION_00)
return (EINVAL);
error = copyin(uap->rightsp, &rights,
sizeof(rights.cr_rights[0]) * CAPARSIZE(&rights));
if (error != 0)
return (error);
/* Check for race. */
if (CAPVER(&rights) != version)
return (EINVAL);
if (!cap_rights_is_valid(&rights))
return (EINVAL);
if (version != CAP_RIGHTS_VERSION) {
rights.cr_rights[0] &= ~(0x3ULL << 62);
rights.cr_rights[0] |= ((uint64_t)CAP_RIGHTS_VERSION << 62);
}
#ifdef KTRACE
if (KTRPOINT(td, KTR_STRUCT))
ktrcaprights(&rights);
#endif
AUDIT_ARG_FD(uap->fd);
AUDIT_ARG_RIGHTS(&rights);
return (kern_cap_rights_limit(td, uap->fd, &rights));
}
/*
* System call to limit rights of the given capability.
*/
int
sys_cap_rights_limit(struct thread *td, struct cap_rights_limit_args *uap)
{
struct filedesc *fdp;
cap_rights_t rights;
int error, fd, version;
cap_rights_init(&rights);
error = copyin(uap->rightsp, &rights, sizeof(rights.cr_rights[0]));
if (error != 0)
return (error);
version = CAPVER(&rights);
if (version != CAP_RIGHTS_VERSION_00)
return (EINVAL);
error = copyin(uap->rightsp, &rights,
sizeof(rights.cr_rights[0]) * CAPARSIZE(&rights));
if (error != 0)
return (error);
/* Check for race. */
if (CAPVER(&rights) != version)
return (EINVAL);
if (!cap_rights_is_valid(&rights))
return (EINVAL);
if (version != CAP_RIGHTS_VERSION) {
rights.cr_rights[0] &= ~(0x3ULL << 62);
rights.cr_rights[0] |= ((uint64_t)CAP_RIGHTS_VERSION << 62);
}
#ifdef KTRACE
if (KTRPOINT(td, KTR_STRUCT))
ktrcaprights(&rights);
#endif
fd = uap->fd;
AUDIT_ARG_FD(fd);
AUDIT_ARG_RIGHTS(&rights);
fdp = td->td_proc->p_fd;
FILEDESC_XLOCK(fdp);
if (fget_locked(fdp, fd) == NULL) {
FILEDESC_XUNLOCK(fdp);
return (EBADF);
}
error = _cap_check(cap_rights(fdp, fd), &rights, CAPFAIL_INCREASE);
if (error == 0) {
fdp->fd_ofiles[fd].fde_rights = rights;
if (!cap_rights_is_set(&rights, CAP_IOCTL)) {
free(fdp->fd_ofiles[fd].fde_ioctls, M_FILECAPS);
fdp->fd_ofiles[fd].fde_ioctls = NULL;
fdp->fd_ofiles[fd].fde_nioctls = 0;
}
if (!cap_rights_is_set(&rights, CAP_FCNTL))
fdp->fd_ofiles[fd].fde_fcntls = 0;
}
FILEDESC_XUNLOCK(fdp);
return (error);
}
