libblkid: arch independent minix detection
It seems that on-disk MINIX FS superblock is native-endian. Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=833841 Signed-off-by: Karel Zak <kzak@redhat.com>
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@ -73,10 +73,13 @@ struct minix3_super_block {
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#define MINIX_VALID_FS 0x0001 /* Clean fs. */
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#define MINIX_ERROR_FS 0x0002 /* fs has errors. */
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#define MINIX_SUPER_MAGIC 0x137F /* original minix fs */
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#define MINIX_SUPER_MAGIC2 0x138F /* minix fs, 30 char names */
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#define MINIX2_SUPER_MAGIC 0x2468 /* minix V2 fs */
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#define MINIX_SUPER_MAGIC 0x137F /* minix V1 fs, 14 char names */
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#define MINIX_SUPER_MAGIC2 0x138F /* minix V1 fs, 30 char names */
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#define MINIX2_SUPER_MAGIC 0x2468 /* minix V2 fs, 14 char names */
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#define MINIX2_SUPER_MAGIC2 0x2478 /* minix V2 fs, 30 char names */
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#define MINIX3_SUPER_MAGIC 0x4d5a /* minix V3 fs (60 char names) */
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#endif /* UTIL_LINUX_MINIX_H */
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@ -3,7 +3,7 @@
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* Copyright (C) 1999, 2000, 2003 by Theodore Ts'o
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* Copyright (C) 2001 by Andreas Dilger
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
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* Copyright (C) 2008-2013 Karel Zak <kzak@redhat.com>
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*
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* This file may be redistributed under the terms of the
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* GNU Lesser General Public License.
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@ -13,50 +13,103 @@
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#include "superblocks.h"
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#include "minix.h"
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static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag)
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{
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unsigned char *ext;
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int version;
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#define minix_swab16(doit, num) ((uint16_t) (doit ? swab16(num) : num))
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#define minix_swab32(doit, num) ((uint32_t) (doit ? swab32(num) : num))
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/* for more details see magic strings below */
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switch(mag->magic[1]) {
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case '\023':
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static int get_minix_version(const unsigned char *data, int *other_endian)
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{
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struct minix_super_block *sb = (struct minix_super_block *) data;
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struct minix3_super_block *sb3 = (struct minix3_super_block *) data;
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int version = 0;
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*other_endian = 0;
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switch (sb->s_magic) {
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case MINIX_SUPER_MAGIC:
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case MINIX_SUPER_MAGIC2:
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version = 1;
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break;
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case '\044':
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case MINIX2_SUPER_MAGIC:
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case MINIX2_SUPER_MAGIC2:
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version = 2;
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break;
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case '\115':
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version = 3;
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break;
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default:
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return -1;
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if (sb3->s_magic == MINIX3_SUPER_MAGIC)
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version = 3;
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break;
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}
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if (version <= 2) {
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struct minix_super_block *sb;
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uint32_t zones;
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if (!version) {
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*other_endian = 1;
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sb = blkid_probe_get_sb(pr, mag, struct minix_super_block);
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if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
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switch (swab16(sb->s_magic)) {
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case MINIX_SUPER_MAGIC:
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case MINIX_SUPER_MAGIC2:
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version = 1;
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break;
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case MINIX2_SUPER_MAGIC:
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case MINIX2_SUPER_MAGIC2:
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version = 2;
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break;
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default:
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if (sb3->s_magic == MINIX3_SUPER_MAGIC)
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version = 3;
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break;
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}
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}
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if (!version)
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return -1;
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zones = version == 2 ? sb->s_zones : sb->s_nzones;
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DBG(LOWPROBE, blkid_debug("minix version %d detected [%s]", version,
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#if defined(WORDS_BIGENDIAN)
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*other_endian ? "LE" : "BE"
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#else
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*other_endian ? "BE" : "LE"
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#endif
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));
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return version;
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}
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static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag)
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{
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unsigned char *ext;
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const unsigned char *data;
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int version = 0, swabme = 0;
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data = blkid_probe_get_buffer(pr, 1024,
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max(sizeof(struct minix_super_block),
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sizeof(struct minix3_super_block)));
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if (!data)
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return -1;
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version = get_minix_version(data, &swabme);
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if (version < 1)
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return -1;
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if (version <= 2) {
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struct minix_super_block *sb = (struct minix_super_block *) data;
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int zones, ninodes, imaps, zmaps, firstz;
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if (sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
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return -1;
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zones = version == 2 ? minix_swab32(swabme, sb->s_zones) :
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minix_swab16(swabme, sb->s_nzones);
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ninodes = minix_swab16(swabme, sb->s_ninodes);
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imaps = minix_swab16(swabme, sb->s_imap_blocks);
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zmaps = minix_swab16(swabme, sb->s_zmap_blocks);
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firstz = minix_swab16(swabme, sb->s_firstdatazone);
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/* sanity checks to be sure that the FS is really minix */
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if (sb->s_imap_blocks * MINIX_BLOCK_SIZE * 8 < sb->s_ninodes + 1)
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if (imaps * MINIX_BLOCK_SIZE * 8 < ninodes + 1)
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return -1;
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if (sb->s_zmap_blocks * MINIX_BLOCK_SIZE * 8 < zones - sb->s_firstdatazone + 1)
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if (zmaps * MINIX_BLOCK_SIZE * 8 < zones - firstz + 1)
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return -1;
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} else if (version == 3) {
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struct minix3_super_block *sb;
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struct minix3_super_block *sb = (struct minix3_super_block *) data;
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sb = blkid_probe_get_sb(pr, mag, struct minix3_super_block);
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if (!sb || sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
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if (sb->s_imap_blocks == 0 || sb->s_zmap_blocks == 0)
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return -1;
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}
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/* unfortunately, some parts of ext3 is sometimes possible to
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@ -78,16 +131,28 @@ const struct blkid_idinfo minix_idinfo =
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.probefunc = probe_minix,
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.magics =
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{
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/* version 1 */
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/* version 1 - LE */
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{ .magic = "\177\023", .len = 2, .kboff = 1, .sboff = 0x10 },
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{ .magic = "\217\023", .len = 2, .kboff = 1, .sboff = 0x10 },
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/* version 2 */
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/* version 1 - BE */
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{ .magic = "\023\177", .len = 2, .kboff = 1, .sboff = 0x10 },
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{ .magic = "\023\217", .len = 2, .kboff = 1, .sboff = 0x10 },
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/* version 2 - LE */
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{ .magic = "\150\044", .len = 2, .kboff = 1, .sboff = 0x10 },
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{ .magic = "\170\044", .len = 2, .kboff = 1, .sboff = 0x10 },
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/* version 3 */
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/* version 2 - BE */
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{ .magic = "\044\150", .len = 2, .kboff = 1, .sboff = 0x10 },
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{ .magic = "\044\170", .len = 2, .kboff = 1, .sboff = 0x10 },
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/* version 3 - LE */
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{ .magic = "\132\115", .len = 2, .kboff = 1, .sboff = 0x18 },
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/* version 3 - BE */
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{ .magic = "\115\132", .len = 2, .kboff = 1, .sboff = 0x18 },
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{ NULL }
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}
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};
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