7008be5bd7
in the future in a backward compatible (API and ABI) way.
The cap_rights_t represents capability rights. We used to use one bit to
represent one right, but we are running out of spare bits. Currently the new
structure provides place for 114 rights (so 50 more than the previous
cap_rights_t), but it is possible to grow the structure to hold at least 285
rights, although we can make it even larger if 285 rights won't be enough.
The structure definition looks like this:
struct cap_rights {
uint64_t cr_rights[CAP_RIGHTS_VERSION + 2];
};
The initial CAP_RIGHTS_VERSION is 0.
The top two bits in the first element of the cr_rights[] array contain total
number of elements in the array - 2. This means if those two bits are equal to
0, we have 2 array elements.
The top two bits in all remaining array elements should be 0.
The next five bits in all array elements contain array index. Only one bit is
used and bit position in this five-bits range defines array index. This means
there can be at most five array elements in the future.
To define new right the CAPRIGHT() macro must be used. The macro takes two
arguments - an array index and a bit to set, eg.
#define CAP_PDKILL CAPRIGHT(1, 0x0000000000000800ULL)
We still support aliases that combine few rights, but the rights have to belong
to the same array element, eg:
#define CAP_LOOKUP CAPRIGHT(0, 0x0000000000000400ULL)
#define CAP_FCHMOD CAPRIGHT(0, 0x0000000000002000ULL)
#define CAP_FCHMODAT (CAP_FCHMOD | CAP_LOOKUP)
There is new API to manage the new cap_rights_t structure:
cap_rights_t *cap_rights_init(cap_rights_t *rights, ...);
void cap_rights_set(cap_rights_t *rights, ...);
void cap_rights_clear(cap_rights_t *rights, ...);
bool cap_rights_is_set(const cap_rights_t *rights, ...);
bool cap_rights_is_valid(const cap_rights_t *rights);
void cap_rights_merge(cap_rights_t *dst, const cap_rights_t *src);
void cap_rights_remove(cap_rights_t *dst, const cap_rights_t *src);
bool cap_rights_contains(const cap_rights_t *big, const cap_rights_t *little);
Capability rights to the cap_rights_init(), cap_rights_set(),
cap_rights_clear() and cap_rights_is_set() functions are provided by
separating them with commas, eg:
cap_rights_t rights;
cap_rights_init(&rights, CAP_READ, CAP_WRITE, CAP_FSTAT);
There is no need to terminate the list of rights, as those functions are
actually macros that take care of the termination, eg:
#define cap_rights_set(rights, ...) \
__cap_rights_set((rights), __VA_ARGS__, 0ULL)
void __cap_rights_set(cap_rights_t *rights, ...);
Thanks to using one bit as an array index we can assert in those functions that
there are no two rights belonging to different array elements provided
together. For example this is illegal and will be detected, because CAP_LOOKUP
belongs to element 0 and CAP_PDKILL to element 1:
cap_rights_init(&rights, CAP_LOOKUP | CAP_PDKILL);
Providing several rights that belongs to the same array's element this way is
correct, but is not advised. It should only be used for aliases definition.
This commit also breaks compatibility with some existing Capsicum system calls,
but I see no other way to do that. This should be fine as Capsicum is still
experimental and this change is not going to 9.x.
Sponsored by: The FreeBSD Foundation
407 lines
11 KiB
C
407 lines
11 KiB
C
/*-
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* Copyright (c) 2008 David E. O'Brien
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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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* 3. Neither the name of the author nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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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 "opt_compat.h"
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#include <sys/param.h>
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#include <sys/capability.h>
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#include <sys/cdio.h>
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#include <sys/fcntl.h>
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#include <sys/filio.h>
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#include <sys/file.h>
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#include <sys/ioccom.h>
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#include <sys/malloc.h>
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#include <sys/mdioctl.h>
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#include <sys/memrange.h>
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#include <sys/pciio.h>
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#include <sys/proc.h>
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#include <sys/syscall.h>
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#include <sys/syscallsubr.h>
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#include <sys/sysctl.h>
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#include <sys/sysent.h>
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#include <sys/sysproto.h>
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#include <sys/systm.h>
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#include <compat/freebsd32/freebsd32.h>
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#include <compat/freebsd32/freebsd32_ioctl.h>
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#include <compat/freebsd32/freebsd32_proto.h>
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/* Cannot get exact size in 64-bit due to alignment issue of entire struct. */
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CTASSERT((sizeof(struct md_ioctl32)+4) == 436);
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CTASSERT(sizeof(struct ioc_read_toc_entry32) == 8);
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CTASSERT(sizeof(struct ioc_toc_header32) == 4);
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CTASSERT(sizeof(struct mem_range_op32) == 12);
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CTASSERT(sizeof(struct pci_conf_io32) == 36);
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CTASSERT(sizeof(struct pci_match_conf32) == 44);
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CTASSERT(sizeof(struct pci_conf32) == 44);
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static int
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freebsd32_ioctl_md(struct thread *td, struct freebsd32_ioctl_args *uap,
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struct file *fp)
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{
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struct md_ioctl mdv;
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struct md_ioctl32 md32;
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u_long com = 0;
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int i, error;
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if (uap->com & IOC_IN) {
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if ((error = copyin(uap->data, &md32, sizeof(md32)))) {
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return (error);
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}
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CP(md32, mdv, md_version);
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CP(md32, mdv, md_unit);
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CP(md32, mdv, md_type);
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PTRIN_CP(md32, mdv, md_file);
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CP(md32, mdv, md_mediasize);
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CP(md32, mdv, md_sectorsize);
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CP(md32, mdv, md_options);
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CP(md32, mdv, md_base);
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CP(md32, mdv, md_fwheads);
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CP(md32, mdv, md_fwsectors);
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} else if (uap->com & IOC_OUT) {
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/*
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* Zero the buffer so the user always
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* gets back something deterministic.
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*/
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bzero(&mdv, sizeof mdv);
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}
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switch (uap->com) {
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case MDIOCATTACH_32:
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com = MDIOCATTACH;
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break;
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case MDIOCDETACH_32:
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com = MDIOCDETACH;
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break;
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case MDIOCQUERY_32:
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com = MDIOCQUERY;
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break;
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case MDIOCLIST_32:
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com = MDIOCLIST;
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break;
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default:
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panic("%s: unknown MDIOC %#x", __func__, uap->com);
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}
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error = fo_ioctl(fp, com, (caddr_t)&mdv, td->td_ucred, td);
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if (error == 0 && (com & IOC_OUT)) {
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CP(mdv, md32, md_version);
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CP(mdv, md32, md_unit);
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CP(mdv, md32, md_type);
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PTROUT_CP(mdv, md32, md_file);
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CP(mdv, md32, md_mediasize);
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CP(mdv, md32, md_sectorsize);
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CP(mdv, md32, md_options);
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CP(mdv, md32, md_base);
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CP(mdv, md32, md_fwheads);
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CP(mdv, md32, md_fwsectors);
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if (com == MDIOCLIST) {
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/*
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* Use MDNPAD, and not MDNPAD32. Padding is
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* allocated and used by compat32 ABI.
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*/
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for (i = 0; i < MDNPAD; i++)
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CP(mdv, md32, md_pad[i]);
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}
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error = copyout(&md32, uap->data, sizeof(md32));
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}
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return error;
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}
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static int
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freebsd32_ioctl_ioc_toc_header(struct thread *td,
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struct freebsd32_ioctl_args *uap, struct file *fp)
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{
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struct ioc_toc_header toch;
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struct ioc_toc_header32 toch32;
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int error;
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if ((error = copyin(uap->data, &toch32, sizeof(toch32))))
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return (error);
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CP(toch32, toch, len);
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CP(toch32, toch, starting_track);
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CP(toch32, toch, ending_track);
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error = fo_ioctl(fp, CDIOREADTOCHEADER, (caddr_t)&toch,
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td->td_ucred, td);
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return (error);
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}
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static int
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freebsd32_ioctl_ioc_read_toc(struct thread *td,
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struct freebsd32_ioctl_args *uap, struct file *fp)
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{
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struct ioc_read_toc_entry toce;
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struct ioc_read_toc_entry32 toce32;
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int error;
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if ((error = copyin(uap->data, &toce32, sizeof(toce32))))
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return (error);
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CP(toce32, toce, address_format);
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CP(toce32, toce, starting_track);
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CP(toce32, toce, data_len);
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PTRIN_CP(toce32, toce, data);
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if ((error = fo_ioctl(fp, CDIOREADTOCENTRYS, (caddr_t)&toce,
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td->td_ucred, td))) {
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CP(toce, toce32, address_format);
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CP(toce, toce32, starting_track);
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CP(toce, toce32, data_len);
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PTROUT_CP(toce, toce32, data);
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error = copyout(&toce32, uap->data, sizeof(toce32));
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}
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return error;
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}
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static int
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freebsd32_ioctl_fiodgname(struct thread *td,
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struct freebsd32_ioctl_args *uap, struct file *fp)
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{
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struct fiodgname_arg fgn;
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struct fiodgname_arg32 fgn32;
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int error;
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if ((error = copyin(uap->data, &fgn32, sizeof fgn32)) != 0)
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return (error);
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CP(fgn32, fgn, len);
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PTRIN_CP(fgn32, fgn, buf);
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error = fo_ioctl(fp, FIODGNAME, (caddr_t)&fgn, td->td_ucred, td);
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return (error);
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}
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static int
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freebsd32_ioctl_memrange(struct thread *td,
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struct freebsd32_ioctl_args *uap, struct file *fp)
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{
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struct mem_range_op mro;
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struct mem_range_op32 mro32;
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int error;
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u_long com;
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if ((error = copyin(uap->data, &mro32, sizeof(mro32))) != 0)
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return (error);
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PTRIN_CP(mro32, mro, mo_desc);
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CP(mro32, mro, mo_arg[0]);
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CP(mro32, mro, mo_arg[1]);
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com = 0;
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switch (uap->com) {
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case MEMRANGE_GET32:
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com = MEMRANGE_GET;
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break;
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case MEMRANGE_SET32:
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com = MEMRANGE_SET;
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break;
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default:
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panic("%s: unknown MEMRANGE %#x", __func__, uap->com);
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}
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if ((error = fo_ioctl(fp, com, (caddr_t)&mro, td->td_ucred, td)) != 0)
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return (error);
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if ( (com & IOC_OUT) ) {
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CP(mro, mro32, mo_arg[0]);
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CP(mro, mro32, mo_arg[1]);
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error = copyout(&mro32, uap->data, sizeof(mro32));
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}
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return (error);
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}
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static int
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freebsd32_ioctl_pciocgetconf(struct thread *td,
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struct freebsd32_ioctl_args *uap, struct file *fp)
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{
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struct pci_conf_io pci;
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struct pci_conf_io32 pci32;
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struct pci_match_conf32 pmc32;
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struct pci_match_conf32 *pmc32p;
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struct pci_match_conf pmc;
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struct pci_match_conf *pmcp;
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struct pci_conf32 pc32;
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struct pci_conf32 *pc32p;
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struct pci_conf pc;
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struct pci_conf *pcp;
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u_int32_t i;
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u_int32_t npat_to_convert;
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u_int32_t nmatch_to_convert;
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vm_offset_t addr;
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int error;
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if ((error = copyin(uap->data, &pci32, sizeof(pci32))) != 0)
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return (error);
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CP(pci32, pci, num_patterns);
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CP(pci32, pci, offset);
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CP(pci32, pci, generation);
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npat_to_convert = pci32.pat_buf_len / sizeof(struct pci_match_conf32);
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pci.pat_buf_len = npat_to_convert * sizeof(struct pci_match_conf);
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pci.patterns = NULL;
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nmatch_to_convert = pci32.match_buf_len / sizeof(struct pci_conf32);
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pci.match_buf_len = nmatch_to_convert * sizeof(struct pci_conf);
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pci.matches = NULL;
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if ((error = copyout_map(td, &addr, pci.pat_buf_len)) != 0)
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goto cleanup;
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pci.patterns = (struct pci_match_conf *)addr;
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if ((error = copyout_map(td, &addr, pci.match_buf_len)) != 0)
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goto cleanup;
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pci.matches = (struct pci_conf *)addr;
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npat_to_convert = min(npat_to_convert, pci.num_patterns);
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for (i = 0, pmc32p = (struct pci_match_conf32 *)PTRIN(pci32.patterns),
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pmcp = pci.patterns;
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i < npat_to_convert; i++, pmc32p++, pmcp++) {
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if ((error = copyin(pmc32p, &pmc32, sizeof(pmc32))) != 0)
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goto cleanup;
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CP(pmc32,pmc,pc_sel);
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strlcpy(pmc.pd_name, pmc32.pd_name, sizeof(pmc.pd_name));
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CP(pmc32,pmc,pd_unit);
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CP(pmc32,pmc,pc_vendor);
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CP(pmc32,pmc,pc_device);
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CP(pmc32,pmc,pc_class);
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CP(pmc32,pmc,flags);
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if ((error = copyout(&pmc, pmcp, sizeof(pmc))) != 0)
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goto cleanup;
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}
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if ((error = fo_ioctl(fp, PCIOCGETCONF, (caddr_t)&pci,
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td->td_ucred, td)) != 0)
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goto cleanup;
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nmatch_to_convert = min(nmatch_to_convert, pci.num_matches);
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for (i = 0, pcp = pci.matches,
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pc32p = (struct pci_conf32 *)PTRIN(pci32.matches);
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i < nmatch_to_convert; i++, pcp++, pc32p++) {
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if ((error = copyin(pcp, &pc, sizeof(pc))) != 0)
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goto cleanup;
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CP(pc,pc32,pc_sel);
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CP(pc,pc32,pc_hdr);
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CP(pc,pc32,pc_subvendor);
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CP(pc,pc32,pc_subdevice);
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CP(pc,pc32,pc_vendor);
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CP(pc,pc32,pc_device);
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CP(pc,pc32,pc_class);
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CP(pc,pc32,pc_subclass);
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CP(pc,pc32,pc_progif);
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CP(pc,pc32,pc_revid);
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strlcpy(pc32.pd_name, pc.pd_name, sizeof(pc32.pd_name));
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CP(pc,pc32,pd_unit);
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if ((error = copyout(&pc32, pc32p, sizeof(pc32))) != 0)
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goto cleanup;
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}
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CP(pci, pci32, num_matches);
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CP(pci, pci32, offset);
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CP(pci, pci32, generation);
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CP(pci, pci32, status);
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error = copyout(&pci32, uap->data, sizeof(pci32));
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cleanup:
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if (pci.patterns)
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copyout_unmap(td, (vm_offset_t)pci.patterns, pci.pat_buf_len);
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if (pci.matches)
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copyout_unmap(td, (vm_offset_t)pci.matches, pci.match_buf_len);
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return (error);
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}
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int
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freebsd32_ioctl(struct thread *td, struct freebsd32_ioctl_args *uap)
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{
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struct ioctl_args ap /*{
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int fd;
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u_long com;
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caddr_t data;
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}*/ ;
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struct file *fp;
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cap_rights_t rights;
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int error;
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error = fget(td, uap->fd, cap_rights_init(&rights, CAP_IOCTL), &fp);
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if (error != 0)
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return (error);
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if ((fp->f_flag & (FREAD | FWRITE)) == 0) {
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fdrop(fp, td);
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return (EBADF);
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}
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switch (uap->com) {
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case MDIOCATTACH_32: /* FALLTHROUGH */
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case MDIOCDETACH_32: /* FALLTHROUGH */
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case MDIOCQUERY_32: /* FALLTHROUGH */
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case MDIOCLIST_32:
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error = freebsd32_ioctl_md(td, uap, fp);
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break;
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case CDIOREADTOCENTRYS_32:
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error = freebsd32_ioctl_ioc_read_toc(td, uap, fp);
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break;
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case CDIOREADTOCHEADER_32:
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error = freebsd32_ioctl_ioc_toc_header(td, uap, fp);
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break;
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case FIODGNAME_32:
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|
error = freebsd32_ioctl_fiodgname(td, uap, fp);
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break;
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case MEMRANGE_GET32: /* FALLTHROUGH */
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|
case MEMRANGE_SET32:
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error = freebsd32_ioctl_memrange(td, uap, fp);
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break;
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case PCIOCGETCONF_32:
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|
error = freebsd32_ioctl_pciocgetconf(td, uap, fp);
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break;
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default:
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|
fdrop(fp, td);
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ap.fd = uap->fd;
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|
ap.com = uap->com;
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|
PTRIN_CP(*uap, ap, data);
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|
return sys_ioctl(td, &ap);
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|
}
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|
fdrop(fp, td);
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|
return error;
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|
}
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