5402baa5b5
Make sure that the provider sector size is large enough to contain a valid label before trying to read it. We performed this check already for most label types, but not for several filesystem labels. Reported by: syzbot+f52918174cdf193ae29c@syzkaller.appspotmail.com MFC after: 1 week Sponsored by: The FreeBSD Foundation
81 lines
2.6 KiB
C
81 lines
2.6 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2004 Pawel Jakub Dawidek <pjd@FreeBSD.org>
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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 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 <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <geom/geom.h>
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#include <geom/geom_dbg.h>
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#include <geom/label/g_label.h>
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#define ISO9660_MAGIC "\x01" "CD001" "\x01\x00"
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#define ISO9660_OFFSET 0x8000
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#define VOLUME_LEN 32
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static void
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g_label_iso9660_taste(struct g_consumer *cp, char *label, size_t size)
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{
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struct g_provider *pp;
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char *sector, *volume;
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g_topology_assert_not();
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pp = cp->provider;
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label[0] = '\0';
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if ((ISO9660_OFFSET % pp->sectorsize) != 0)
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return;
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if (pp->sectorsize < 0x28 + VOLUME_LEN)
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return;
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sector = g_read_data(cp, ISO9660_OFFSET, pp->sectorsize, NULL);
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if (sector == NULL)
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return;
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if (bcmp(sector, ISO9660_MAGIC, sizeof(ISO9660_MAGIC) - 1) != 0) {
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g_free(sector);
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return;
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}
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G_LABEL_DEBUG(1, "ISO9660 file system detected on %s.", pp->name);
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volume = sector + 0x28;
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bzero(label, size);
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strlcpy(label, volume, MIN(size, VOLUME_LEN));
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g_free(sector);
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g_label_rtrim(label, size);
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}
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struct g_label_desc g_label_iso9660 = {
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.ld_taste = g_label_iso9660_taste,
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.ld_dirprefix = "iso9660/",
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.ld_enabled = 1
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};
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G_LABEL_INIT(iso9660, g_label_iso9660, "Create device nodes for ISO9660 volume names");
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