93 lines
2.7 KiB
Diff
93 lines
2.7 KiB
Diff
From cb92f0d82ae634e46989d3dae673ae3f542f7dd9 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Fri, 21 Oct 2022 18:11:59 +0200
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Subject: [PATCH] libblkid: fix jmicron checksum and LE to CPU
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- don't cast packed struct to uint16_t pointer, use temporary value
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- calculate real count for the loop
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- convert all to LE for checksum calculation (jm_to_cpu() ignores fillers)
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libblkid/src/superblocks/jmicron_raid.c | 44 ++++++++++++++-----------
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1 file changed, 25 insertions(+), 19 deletions(-)
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diff --git a/libblkid/src/superblocks/jmicron_raid.c b/libblkid/src/superblocks/jmicron_raid.c
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index ab2c829f0..580c38533 100644
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--- a/libblkid/src/superblocks/jmicron_raid.c
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+++ b/libblkid/src/superblocks/jmicron_raid.c
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@@ -55,35 +55,38 @@ static void jm_to_cpu(struct jm_metadata *jm)
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{
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unsigned int i;
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- le16_to_cpu(jm->version);
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- le16_to_cpu(jm->checksum);
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- le32_to_cpu(jm->identity);
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+ jm->version = le16_to_cpu(jm->version);
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+ jm->checksum = le16_to_cpu(jm->checksum);
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+ jm->identity = le32_to_cpu(jm->identity);
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+ jm->segment.base = le32_to_cpu(jm->segment.base);
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+ jm->segment.range = le32_to_cpu(jm->segment.range);
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+ jm->segment.range2 = le16_to_cpu(jm->segment.range2);
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- le32_to_cpu(jm->segment.base);
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- le32_to_cpu(jm->segment.range);
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- le16_to_cpu(jm->segment.range2);
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-
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- le16_to_cpu(jm->attribute);
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+ jm->attribute = le16_to_cpu(jm->attribute);
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for (i = 0; i < JM_SPARES; i++)
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- le32_to_cpu(jm->spare[i]);
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+ jm->spare[i] = le32_to_cpu(jm->spare[i]);
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for (i = 0; i < JM_MEMBERS; i++)
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- le32_to_cpu(jm->member[i]);
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+ jm->member[i] = le32_to_cpu(jm->member[i]);
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}
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-static int jm_checksum(struct jm_metadata *jm)
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+static int jm_checksum(const struct jm_metadata *jm)
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{
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- size_t count = 64;
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- char *buf = (char *) jm;
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- uint16_t *p = (uint16_t *) buf, sum = 0;
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+ size_t count = sizeof(*jm) / sizeof(uint16_t);
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+ uint16_t sum = 0;
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+ unsigned char *ptr = (unsigned char *) jm;
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+
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+ while (count--) {
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+ uint16_t val;
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- assert(count <= sizeof(struct jm_metadata));
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+ memcpy(&val, ptr, sizeof(uint16_t));
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+ sum += le16_to_cpu(val);
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- while (count--)
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- sum += *p++;
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+ ptr += sizeof(uint16_t);
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+ }
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- return !sum || sum == 1;
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+ return sum == 0 || sum == 1;
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}
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static int probe_jmraid(blkid_probe pr,
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@@ -108,9 +111,12 @@ static int probe_jmraid(blkid_probe pr,
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if (memcmp(jm->signature, JM_SIGNATURE, sizeof(JM_SIGNATURE) - 1) != 0)
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return 1;
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+ if (!jm_checksum(jm))
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+ return 1;
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+
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jm_to_cpu(jm);
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- if (!jm_checksum(jm))
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+ if (jm->mode > 5)
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return 1;
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if (blkid_probe_sprintf_version(pr, "%u.%u",
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--
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2.27.0
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