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Blame SOURCES/0152-libblkid-minix-Use-same-checks-for-version-3.patch

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From 0ade71743e5f96fbdb0f4a85c3eef22b88363f13 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 152/152] 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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