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From 171e9743881edf2dfb163ddff483566fbf913ccd Mon Sep 17 00:00:00 2001
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From: NeilBrown <neilb@suse.de>
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Date: Fri, 26 Aug 2022 08:55:56 +1000
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Subject: [PATCH 53/83] super1: report truncated device
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When the metadata is at the start of the device, it is possible that it
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describes a device large than the one it is actually stored on. When
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this happens, report it loudly in --examine.
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....
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Unused Space : before=1968 sectors, after=-2047 sectors DEVICE TOO SMALL
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State : clean TRUNCATED DEVICE
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....
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Also report in --assemble so that the failure which the kernel will
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report will be explained.
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mdadm: Device /dev/sdb is not large enough for data described in superblock
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mdadm: no RAID superblock on /dev/sdb
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mdadm: /dev/sdb has no superblock - assembly aborted
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Scenario can be demonstrated as follows:
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mdadm: Note: this array has metadata at the start and
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may not be suitable as a boot device. If you plan to
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store '/boot' on this device please ensure that
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your boot-loader understands md/v1.x metadata, or use
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--metadata=0.90
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mdadm: Defaulting to version 1.2 metadata
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mdadm: array /dev/md/test started.
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mdadm: stopped /dev/md/test
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Unused Space : before=1968 sectors, after=-2047 sectors DEVICE TOO SMALL
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State : clean TRUNCATED DEVICE
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Unused Space : before=1968 sectors, after=-2047 sectors DEVICE TOO SMALL
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State : clean TRUNCATED DEVICE
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Signed-off-by: NeilBrown <neilb@suse.de>
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Signed-off-by: Jes Sorensen <jsorensen@fb.com>
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---
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super1.c | 35 ++++++++++++++++++++++++++++-------
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1 file changed, 28 insertions(+), 7 deletions(-)
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diff --git a/super1.c b/super1.c
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index 71af860c..58345e68 100644
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--- a/super1.c
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+++ b/super1.c
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@@ -406,12 +406,18 @@ static void examine_super1(struct supertype *st, char *homehost)
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st->ss->getinfo_super(st, &info, NULL);
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if (info.space_after != 1 &&
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- !(__le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET))
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- printf(" Unused Space : before=%llu sectors, after=%llu sectors\n",
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- info.space_before, info.space_after);
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-
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- printf(" State : %s\n",
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- (__le64_to_cpu(sb->resync_offset)+1)? "active":"clean");
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+ !(__le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) {
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+ printf(" Unused Space : before=%llu sectors, ",
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+ info.space_before);
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+ if (info.space_after < INT64_MAX)
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+ printf("after=%llu sectors\n", info.space_after);
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+ else
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+ printf("after=-%llu sectors DEVICE TOO SMALL\n",
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+ UINT64_MAX - info.space_after);
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+ }
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+ printf(" State : %s%s\n",
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+ (__le64_to_cpu(sb->resync_offset)+1) ? "active":"clean",
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+ (info.space_after > INT64_MAX) ? " TRUNCATED DEVICE" : "");
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printf(" Device UUID : ");
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for (i=0; i<16; i++) {
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if ((i&3)==0 && i != 0)
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@@ -2206,6 +2212,7 @@ static int load_super1(struct supertype *st, int fd, char *devname)
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tst.ss = &super;;
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for (tst.minor_version = 0; tst.minor_version <= 2;
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tst.minor_version++) {
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+ tst.ignore_hw_compat = st->ignore_hw_compat;
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switch(load_super1(&tst, fd, devname)) {
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case 0: super = tst.sb;
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if (bestvers == -1 ||
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@@ -2312,7 +2319,6 @@ static int load_super1(struct supertype *st, int fd, char *devname)
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free(super);
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return 2;
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}
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- st->sb = super;
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bsb = (struct bitmap_super_s *)(((char*)super)+MAX_SB_SIZE);
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@@ -2322,6 +2328,21 @@ static int load_super1(struct supertype *st, int fd, char *devname)
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if (st->data_offset == INVALID_SECTORS)
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st->data_offset = __le64_to_cpu(super->data_offset);
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+ if (st->minor_version >= 1 &&
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+ st->ignore_hw_compat == 0 &&
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+ (dsize < (__le64_to_cpu(super->data_offset) +
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+ __le64_to_cpu(super->size))
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+ ||
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+ dsize < (__le64_to_cpu(super->data_offset) +
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+ __le64_to_cpu(super->data_size)))) {
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+ if (devname)
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+ pr_err("Device %s is not large enough for data described in superblock\n",
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+ devname);
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+ free(super);
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+ return 2;
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+ }
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+ st->sb = super;
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+
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/* Now check on the bitmap superblock */
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if ((__le32_to_cpu(super->feature_map)&MD_FEATURE_BITMAP_OFFSET) == 0)
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return 0;
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--
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2.38.1
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