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
126 lines
3.4 KiB
C
126 lines
3.4 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2005 Stanislav Sedov
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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/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 REISERFS_NEW_DISK_OFFSET 64 * 1024
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#define REISERFS_OLD_DISK_OFFSET 8 * 1024
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#define REISERFS_SUPER_MAGIC "ReIsEr"
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typedef struct reiserfs_sb {
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uint8_t fake1[52];
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char s_magic[10];
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uint8_t fake2[10];
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uint16_t s_version;
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uint8_t fake3[26];
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char s_volume_name[16];
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} reiserfs_sb_t;
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static reiserfs_sb_t *
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g_label_reiserfs_read_super(struct g_consumer *cp, off_t offset)
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{
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reiserfs_sb_t *fs;
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u_int secsize;
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secsize = cp->provider->sectorsize;
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if ((offset % secsize) != 0)
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return (NULL);
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if (secsize < sizeof(*fs))
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return (NULL);
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fs = g_read_data(cp, offset, secsize, NULL);
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if (fs == NULL)
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return (NULL);
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if (strncmp(fs->s_magic, REISERFS_SUPER_MAGIC,
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strlen(REISERFS_SUPER_MAGIC)) != 0) {
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g_free(fs);
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return (NULL);
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}
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return (fs);
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}
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static void
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g_label_reiserfs_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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reiserfs_sb_t *fs;
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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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/* Try old format */
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fs = g_label_reiserfs_read_super(cp, REISERFS_OLD_DISK_OFFSET);
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if (fs == NULL) {
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/* Try new format */
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fs = g_label_reiserfs_read_super(cp, REISERFS_NEW_DISK_OFFSET);
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}
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if (fs == NULL)
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return;
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/* Check version */
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if (fs->s_version == 2) {
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G_LABEL_DEBUG(1, "reiserfs file system detected on %s.",
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pp->name);
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} else {
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goto exit_free;
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}
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/* Check for volume label */
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if (fs->s_volume_name[0] == '\0')
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goto exit_free;
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/* Terminate label */
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fs->s_volume_name[sizeof(fs->s_volume_name) - 1] = '\0';
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strlcpy(label, fs->s_volume_name, size);
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exit_free:
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g_free(fs);
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}
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struct g_label_desc g_label_reiserfs = {
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.ld_taste = g_label_reiserfs_taste,
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.ld_dirprefix = "reiserfs/",
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.ld_enabled = 1
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};
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G_LABEL_INIT(reiserfs, g_label_reiserfs, "Create device nodes for REISERFS volumes");
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