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From 768b91ef6f68661462494bed800505064eb97bc8 Mon Sep 17 00:00:00 2001
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From: Milan Broz <gmazyland@gmail.com>
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Date: Wed, 11 Jul 2018 12:34:39 +0200
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Subject: [PATCH 1/6] libblkid: Check for a secondary LUKS2 header.
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This patch adds search for a secondary LUKS2 header,
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if the primary one is corrupted.
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This patch is primarily needed for wipefs that should wipe
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both signatures (otherwise LUKS2 header recovery can use
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secondary header and revert wipefs action).
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Signed-off-by: Milan Broz <gmazyland@gmail.com>
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Upstream: http://github.com/karelzak/util-linux/commit/8bee1a220db8effbe5a75ba9bc68840e019ea89a
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1595882
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---
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libblkid/src/superblocks/luks.c | 60 ++++++++++++++++++++++++++++++++---------
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1 file changed, 47 insertions(+), 13 deletions(-)
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diff --git a/libblkid/src/superblocks/luks.c b/libblkid/src/superblocks/luks.c
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index bc3d7f558..67d7cfcc5 100644
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--- a/libblkid/src/superblocks/luks.c
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+++ b/libblkid/src/superblocks/luks.c
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@@ -1,5 +1,6 @@
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/*
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* Copyright (C) 2008 Karel Zak <kzak@redhat.com>
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+ * Copyright (C) 2018 Milan Broz <gmazyland@gmail.com>
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*
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* Inspired by libvolume_id by
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* Kay Sievers <kay.sievers@vrfy.org>
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@@ -29,6 +30,15 @@
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#define LUKS2_CHECKSUM_ALG_L 32
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#define LUKS2_CHECKSUM_L 64
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+#define LUKS_MAGIC "LUKS\xba\xbe"
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+#define LUKS_MAGIC_2 "SKUL\xba\xbe"
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+
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+/* Offsets for secondary header (for scan if primary header is corrupted). */
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+#define LUKS2_HDR2_OFFSETS { 0x04000, 0x008000, 0x010000, 0x020000, \
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+ 0x40000, 0x080000, 0x100000, 0x200000, 0x400000 }
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+
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+static const uint64_t secondary_offsets[] = LUKS2_HDR2_OFFSETS;
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+
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struct luks_phdr {
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uint8_t magic[LUKS_MAGIC_L];
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uint16_t version;
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@@ -59,18 +69,16 @@ struct luks2_phdr {
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/* Padding to 4k, then JSON area */
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} __attribute__ ((packed));
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-static int probe_luks(blkid_probe pr, const struct blkid_idmag *mag)
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+static int luks_attributes(blkid_probe pr, struct luks2_phdr *header, uint64_t offset)
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{
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- struct luks_phdr *header_v1;
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- struct luks2_phdr *header;
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int version;
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+ struct luks_phdr *header_v1;
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- header = blkid_probe_get_sb(pr, mag, struct luks2_phdr);
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- if (header == NULL)
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- return errno ? -errno : 1;
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+ if (blkid_probe_set_magic(pr, offset, LUKS_MAGIC_L, (unsigned char *) &header->magic))
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+ return BLKID_PROBE_NONE;
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version = be16_to_cpu(header->version);
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- blkid_probe_sprintf_version(pr, "%u", be16_to_cpu(header->version));
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+ blkid_probe_sprintf_version(pr, "%u", version);
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if (version == 1) {
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header_v1 = (struct luks_phdr *)header;
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@@ -84,7 +92,37 @@ static int probe_luks(blkid_probe pr, const struct blkid_idmag *mag)
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blkid_probe_set_id_label(pr, "SUBSYSTEM",
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(unsigned char *) header->subsystem, LUKS2_LABEL_L);
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}
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- return 0;
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+
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+ return BLKID_PROBE_OK;
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+}
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+
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+static int probe_luks(blkid_probe pr, const struct blkid_idmag *mag __attribute__((__unused__)))
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+{
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+ struct luks2_phdr *header;
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+ size_t i;
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+
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+ header = (struct luks2_phdr *) blkid_probe_get_buffer(pr, 0, sizeof(struct luks2_phdr));
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+ if (!header)
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+ return errno ? -errno : BLKID_PROBE_NONE;
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+
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+ if (!memcmp(header->magic, LUKS_MAGIC, LUKS_MAGIC_L)) {
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+ /* LUKS primary header was found. */
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+ return luks_attributes(pr, header, 0);
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+ } else {
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+ /* No primary header, scan for known offsets of LUKS2 secondary header. */
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+ for (i = 0; i < ARRAY_SIZE(secondary_offsets); i++) {
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+ header = (struct luks2_phdr *) blkid_probe_get_buffer(pr,
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+ secondary_offsets[i], sizeof(struct luks2_phdr));
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+
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+ if (!header)
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+ return errno ? -errno : BLKID_PROBE_NONE;
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+
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+ if (!memcmp(header->magic, LUKS_MAGIC_2, LUKS_MAGIC_L))
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+ return luks_attributes(pr, header, secondary_offsets[i]);
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+ }
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+ }
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+
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+ return BLKID_PROBE_NONE;
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}
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const struct blkid_idinfo luks_idinfo =
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@@ -92,9 +130,5 @@ const struct blkid_idinfo luks_idinfo =
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.name = "crypto_LUKS",
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.usage = BLKID_USAGE_CRYPTO,
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.probefunc = probe_luks,
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- .magics =
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- {
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- { .magic = "LUKS\xba\xbe", .len = 6 },
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- { NULL }
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- }
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+ .magics = BLKID_NONE_MAGIC
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};
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--
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2.14.4
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