367a13f905
On CloudABI, the rights bits returned by cap_rights_get() match up with the operations that you can actually perform on the file descriptor. Limiting the rights is good, because it makes it easier to get uniform behaviour across different operating systems. If process descriptors on FreeBSD would suddenly gain support for any new file operation, this wouldn't become exposed to CloudABI processes without first extending the rights. Extend fork1() to gain a 'struct filecaps' argument that allows you to construct process descriptors with custom rights. Use this in cloudabi_sys_proc_fork() to limit the rights to just fstat() and pdwait(). Obtained from: https://github.com/NuxiNL/freebsd
136 lines
3.9 KiB
C
136 lines
3.9 KiB
C
/*-
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* Copyright (c) 2015 Nuxi, https://nuxi.nl/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/capsicum.h>
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#include <sys/filedesc.h>
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#include <sys/imgact.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/proc.h>
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#include <sys/signalvar.h>
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#include <sys/syscallsubr.h>
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#include <sys/unistd.h>
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#include <compat/cloudabi/cloudabi_proto.h>
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#include <compat/cloudabi/cloudabi_syscalldefs.h>
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int
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cloudabi_sys_proc_exec(struct thread *td,
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struct cloudabi_sys_proc_exec_args *uap)
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{
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struct image_args args;
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int error;
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error = exec_copyin_data_fds(td, &args, uap->data, uap->datalen,
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uap->fds, uap->fdslen);
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if (error == 0) {
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args.fd = uap->fd;
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error = kern_execve(td, &args, NULL);
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}
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return (error);
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}
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int
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cloudabi_sys_proc_exit(struct thread *td,
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struct cloudabi_sys_proc_exit_args *uap)
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{
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exit1(td, uap->rval, 0);
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/* NOTREACHED */
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}
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int
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cloudabi_sys_proc_fork(struct thread *td,
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struct cloudabi_sys_proc_fork_args *uap)
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{
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struct filecaps fcaps = {};
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struct proc *p2;
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int error, fd;
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cap_rights_init(&fcaps.fc_rights, CAP_FSTAT, CAP_PDWAIT);
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error = fork1(td, RFFDG | RFPROC | RFPROCDESC, 0, &p2, &fd, 0, &fcaps);
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if (error != 0)
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return (error);
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/* Return the file descriptor to the parent process. */
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td->td_retval[0] = fd;
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return (0);
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}
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int
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cloudabi_sys_proc_raise(struct thread *td,
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struct cloudabi_sys_proc_raise_args *uap)
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{
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static const int signals[] = {
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[CLOUDABI_SIGABRT] = SIGABRT,
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[CLOUDABI_SIGALRM] = SIGALRM,
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[CLOUDABI_SIGBUS] = SIGBUS,
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[CLOUDABI_SIGCHLD] = SIGCHLD,
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[CLOUDABI_SIGCONT] = SIGCONT,
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[CLOUDABI_SIGFPE] = SIGFPE,
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[CLOUDABI_SIGHUP] = SIGHUP,
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[CLOUDABI_SIGILL] = SIGILL,
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[CLOUDABI_SIGINT] = SIGINT,
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[CLOUDABI_SIGKILL] = SIGKILL,
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[CLOUDABI_SIGPIPE] = SIGPIPE,
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[CLOUDABI_SIGQUIT] = SIGQUIT,
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[CLOUDABI_SIGSEGV] = SIGSEGV,
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[CLOUDABI_SIGSTOP] = SIGSTOP,
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[CLOUDABI_SIGSYS] = SIGSYS,
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[CLOUDABI_SIGTERM] = SIGTERM,
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[CLOUDABI_SIGTRAP] = SIGTRAP,
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[CLOUDABI_SIGTSTP] = SIGTSTP,
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[CLOUDABI_SIGTTIN] = SIGTTIN,
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[CLOUDABI_SIGTTOU] = SIGTTOU,
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[CLOUDABI_SIGURG] = SIGURG,
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[CLOUDABI_SIGUSR1] = SIGUSR1,
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[CLOUDABI_SIGUSR2] = SIGUSR2,
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[CLOUDABI_SIGVTALRM] = SIGVTALRM,
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[CLOUDABI_SIGXCPU] = SIGXCPU,
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[CLOUDABI_SIGXFSZ] = SIGXFSZ,
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};
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ksiginfo_t ksi;
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struct proc *p;
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if (uap->sig >= nitems(signals) || signals[uap->sig] == 0) {
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/* Invalid signal, or the null signal. */
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return (uap->sig == 0 ? 0 : EINVAL);
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}
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p = td->td_proc;
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ksiginfo_init(&ksi);
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ksi.ksi_signo = signals[uap->sig];
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ksi.ksi_code = SI_USER;
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ksi.ksi_pid = p->p_pid;
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ksi.ksi_uid = td->td_ucred->cr_ruid;
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PROC_LOCK(p);
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pksignal(p, ksi.ksi_signo, &ksi);
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PROC_UNLOCK(p);
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return (0);
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}
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