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From b5d9bfe34e62cf1c57646efa0bd72ecad7d98258 Mon Sep 17 00:00:00 2001
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From: Nate Clark <nate@neworld.us>
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Date: Wed, 4 Jan 2017 15:24:32 -0500
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Subject: [PATCH 176/176] libblkid/minix: Use same checks for version 3
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fsck.minix performs the same sanity checks on all versions of the
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superblock. Update the probe to perform the same sanity checks so it is
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less likely a different type of filesystem will be identified as minix.
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Upstream: http://github.com/karelzak/util-linux/commit/f82c804869bb8613fa0924e3111b7eb55bb04fcd
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1594681
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Signed-off-by: Nate Clark <nate@neworld.us>
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libblkid/src/superblocks/minix.c | 38 +++++++++++++++++++++++---------------
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1 file changed, 23 insertions(+), 15 deletions(-)
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diff --git a/libblkid/src/superblocks/minix.c b/libblkid/src/superblocks/minix.c
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index 4e70fda8f..21b3bf8bb 100644
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--- a/libblkid/src/superblocks/minix.c
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+++ b/libblkid/src/superblocks/minix.c
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@@ -75,6 +75,9 @@ static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag)
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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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+ unsigned long zones, ninodes, imaps, zmaps;
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+ off_t firstz;
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+ size_t zone_size;
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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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@@ -85,14 +88,9 @@ static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag)
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if (version < 1)
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return 1;
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+
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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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- unsigned long zones, ninodes, imaps, zmaps;
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- off_t firstz;
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-
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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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uint16_t state = minix_swab16(swabme, sb->s_state);
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if ((state & (MINIX_VALID_FS | MINIX_ERROR_FS)) != state)
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return 1;
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@@ -103,20 +101,30 @@ static int probe_minix(blkid_probe pr, const struct blkid_idmag *mag)
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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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-
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- /* sanity checks to be sure that the FS is really minix */
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- if (imaps * MINIX_BLOCK_SIZE * 8 < ninodes + 1)
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- return 1;
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- if (zmaps * MINIX_BLOCK_SIZE * 8 < zones - firstz + 1)
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- return 1;
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-
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+ zone_size = sb->s_log_zone_size;
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} else if (version == 3) {
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struct minix3_super_block *sb = (struct minix3_super_block *) data;
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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 = minix_swab32(swabme, sb->s_zones);
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+ ninodes = minix_swab32(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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+ zone_size = sb->s_log_zone_size;
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}
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+ /* sanity checks to be sure that the FS is really minix.
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+ * see disk-utils/fsck.minix.c read_superblock
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+ */
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+ if (zone_size != 0 || ninodes == 0 || ninodes == UINT32_MAX)
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+ return 1;
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+ if (imaps * MINIX_BLOCK_SIZE * 8 < ninodes + 1)
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+ return 1;
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+ if (firstz > (off_t) zones)
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+ return 1;
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+ if (zmaps * MINIX_BLOCK_SIZE * 8 < zones - firstz + 1)
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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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* interpreted as minix superblock. So check for extN magic
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* string. (For extN magic string and offsets see ext.c.)
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--
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2.14.4
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