a9d2f8d84f
kernel for FreeBSD 9.0: Add a new capability mask argument to fget(9) and friends, allowing system call code to declare what capabilities are required when an integer file descriptor is converted into an in-kernel struct file *. With options CAPABILITIES compiled into the kernel, this enforces capability protection; without, this change is effectively a no-op. Some cases require special handling, such as mmap(2), which must preserve information about the maximum rights at the time of mapping in the memory map so that they can later be enforced in mprotect(2) -- this is done by narrowing the rights in the existing max_protection field used for similar purposes with file permissions. In namei(9), we assert that the code is not reached from within capability mode, as we're not yet ready to enforce namespace capabilities there. This will follow in a later commit. Update two capability names: CAP_EVENT and CAP_KEVENT become CAP_POST_KEVENT and CAP_POLL_KEVENT to more accurately indicate what they represent. Approved by: re (bz) Submitted by: jonathan Sponsored by: Google Inc
89 lines
2.7 KiB
C
89 lines
2.7 KiB
C
/*-
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* Copyright (c) 2006 The FreeBSD Project
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* All rights reserved.
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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/capability.h>
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#include <sys/file.h>
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#include <sys/kernel.h>
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#include <sys/module.h>
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#include <sys/proc.h>
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#include <sys/systm.h>
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#include <dev/tdfx/tdfx_linux.h>
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LINUX_IOCTL_SET(tdfx, LINUX_IOCTL_TDFX_MIN, LINUX_IOCTL_TDFX_MAX);
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/*
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* Linux emulation IOCTL for /dev/tdfx
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*/
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static int
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linux_ioctl_tdfx(struct thread *td, struct linux_ioctl_args* args)
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{
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int error = 0;
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u_long cmd = args->cmd & 0xffff;
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/* The structure passed to ioctl has two shorts, one int
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and one void*. */
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char d_pio[2*sizeof(short) + sizeof(int) + sizeof(void*)];
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struct file *fp;
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if ((error = fget(td, args->fd, CAP_IOCTL, &fp)) != 0)
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return (error);
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/* We simply copy the data and send it right to ioctl */
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copyin((caddr_t)args->arg, &d_pio, sizeof(d_pio));
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error = fo_ioctl(fp, cmd, (caddr_t)&d_pio, td->td_ucred, td);
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fdrop(fp, td);
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return error;
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}
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static int
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tdfx_linux_modevent(struct module *mod __unused, int what, void *arg __unused)
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{
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switch (what) {
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case MOD_LOAD:
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case MOD_UNLOAD:
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return (0);
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}
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return (EOPNOTSUPP);
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}
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static moduledata_t tdfx_linux_mod = {
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"tdfx_linux",
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tdfx_linux_modevent,
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0
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};
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/* As in SYSCALL_MODULE */
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DECLARE_MODULE(tdfx_linux, tdfx_linux_mod, SI_SUB_DRIVERS, SI_ORDER_MIDDLE);
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MODULE_VERSION(tdfx_linux, 1);
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MODULE_DEPEND(tdfx_linux, tdfx, 1, 1, 1);
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MODULE_DEPEND(tdfx_linux, linux, 1, 1, 1);
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