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https://github.com/freebsd/freebsd-src
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bd1da0a002
Change the nvlist_recv() function to take additional argument that specifies flags expected on the received nvlist. Receiving a nvlist with different set of flags than the ones we expect might lead to undefined behaviour, which might be potentially dangerous. Update consumers of this and related functions and update the tests. Approved by: pjd (mentor) Update man page for nvlist_unpack, nvlist_recv, nvlist_xfer, cap_recv_nvlist and cap_xfer_nvlist. Reviewed by: AllanJude Approved by: pjd (mentor)
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*-
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* Copyright (c) 2013 The FreeBSD Foundation
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* All rights reserved.
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*
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* This software was developed by Pawel Jakub Dawidek under sponsorship from
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* the FreeBSD Foundation.
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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 AUTHORS 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 AUTHORS 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 <errno.h>
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#include <string.h>
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#include <nv.h>
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#include "libcapsicum.h"
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#include "libcapsicum_sysctl.h"
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int
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cap_sysctlbyname(cap_channel_t *chan, const char *name, void *oldp,
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size_t *oldlenp, const void *newp, size_t newlen)
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{
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nvlist_t *nvl;
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const uint8_t *retoldp;
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uint8_t operation;
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size_t oldlen;
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operation = 0;
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if (oldp != NULL)
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operation |= CAP_SYSCTL_READ;
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if (newp != NULL)
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operation |= CAP_SYSCTL_WRITE;
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nvl = nvlist_create(0);
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nvlist_add_string(nvl, "cmd", "sysctl");
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nvlist_add_string(nvl, "name", name);
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nvlist_add_number(nvl, "operation", (uint64_t)operation);
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if (oldp == NULL && oldlenp != NULL)
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nvlist_add_null(nvl, "justsize");
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else if (oldlenp != NULL)
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nvlist_add_number(nvl, "oldlen", (uint64_t)*oldlenp);
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if (newp != NULL)
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nvlist_add_binary(nvl, "newp", newp, newlen);
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nvl = cap_xfer_nvlist(chan, nvl, 0);
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if (nvl == NULL)
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return (-1);
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if (nvlist_get_number(nvl, "error") != 0) {
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errno = (int)nvlist_get_number(nvl, "error");
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nvlist_destroy(nvl);
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return (-1);
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}
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if (oldp == NULL && oldlenp != NULL) {
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*oldlenp = (size_t)nvlist_get_number(nvl, "oldlen");
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} else if (oldp != NULL) {
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retoldp = nvlist_get_binary(nvl, "oldp", &oldlen);
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memcpy(oldp, retoldp, oldlen);
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if (oldlenp != NULL)
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*oldlenp = oldlen;
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}
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nvlist_destroy(nvl);
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return (0);
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}
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