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From e7f0f5d3a80324e1430e979b0a170ded77b380e2 Mon Sep 17 00:00:00 2001
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From: Karel Zak <kzak@redhat.com>
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Date: Tue, 13 Oct 2020 16:19:20 +0200
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Subject: libblkid: make Atari more robust
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* ignore large disks
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* check in-table stored device size
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* check bad sectors list
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* check partition dimensions against in-table device size
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Addresses: https://github.com/karelzak/util-linux/issues/1159
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=2060030
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Upstream: http://github.com/util-linux/util-linux/commit/282ceadc3a72fc07dd0388b8880fd751490bb87f
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Signed-off-by: Karel Zak <kzak@redhat.com>
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---
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libblkid/src/partitions/atari.c | 66 ++++++++++++++++++++++++---------
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1 file changed, 48 insertions(+), 18 deletions(-)
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diff --git a/libblkid/src/partitions/atari.c b/libblkid/src/partitions/atari.c
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index b469ef5a1..c3f77117a 100644
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--- a/libblkid/src/partitions/atari.c
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+++ b/libblkid/src/partitions/atari.c
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@@ -74,16 +74,27 @@ static int linux_isalnum(unsigned char c) {
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#define IS_ACTIVE(partdef) ((partdef).flags & 1)
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-#define IS_PARTDEF_VALID(partdef, hdsize) \
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- ( \
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- (partdef).flags & 1 && \
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- isalnum((partdef).id[0]) && \
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- isalnum((partdef).id[1]) && \
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- isalnum((partdef).id[2]) && \
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- be32_to_cpu((partdef).start) <= (hdsize) && \
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- be32_to_cpu((partdef).start) + \
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- be32_to_cpu((partdef).size) <= (hdsize) \
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- )
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+static int is_valid_dimension(uint32_t start, uint32_t size, uint32_t maxoff)
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+{
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+ uint64_t end = start + size;
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+
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+ return end >= start
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+ && 0 < start && start <= maxoff
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+ && 0 < size && size <= maxoff
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+ && 0 < end && end <= maxoff;
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+}
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+
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+static int is_valid_partition(struct atari_part_def *part, uint32_t maxoff)
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+{
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+ uint32_t start = be32_to_cpu(part->start),
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+ size = be32_to_cpu(part->size);
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+
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+ return (part->flags & 1)
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+ && isalnum(part->id[0])
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+ && isalnum(part->id[1])
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+ && isalnum(part->id[2])
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+ && is_valid_dimension(start, size, maxoff);
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+}
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static int is_id_common(char *id)
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{
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@@ -184,12 +195,20 @@ static int probe_atari_pt(blkid_probe pr,
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unsigned i;
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int has_xgm = 0;
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int rc = 0;
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- off_t hdsize;
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+ uint32_t rssize; /* size in sectors from root sector */
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+ uint64_t size; /* size in sectors from system */
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/* Atari partition is not defined for other sector sizes */
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if (blkid_probe_get_sectorsize(pr) != 512)
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goto nothing;
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+ size = blkid_probe_get_size(pr) / 512;
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+
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+ /* Atari is not well defined to support large disks */
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+ if (size > INT32_MAX)
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+ goto nothing;
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+
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+ /* read root sector */
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rs = (struct atari_rootsector *) blkid_probe_get_sector(pr, 0);
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if (!rs) {
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if (errno)
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@@ -197,17 +216,29 @@ static int probe_atari_pt(blkid_probe pr,
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goto nothing;
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}
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- hdsize = blkid_probe_get_size(pr) / 512;
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+ rssize = be32_to_cpu(rs->hd_size);
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+
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+ /* check number of sectors stored in the root sector */
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+ if (rssize < 2 || rssize > size)
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+ goto nothing;
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+
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+ /* check list of bad blocks */
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+ if ((rs->bsl_start || rs->bsl_len)
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+ && !is_valid_dimension(be32_to_cpu(rs->bsl_start),
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+ be32_to_cpu(rs->bsl_len),
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+ rssize))
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+ goto nothing;
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/*
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* At least one valid partition required
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*/
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for (i = 0; i < 4; i++) {
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- if (IS_PARTDEF_VALID(rs->part[i], hdsize)) {
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- blkid_probe_set_magic(pr,
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- offsetof(struct atari_rootsector, part[i]),
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- sizeof(rs->part[i].flags) + sizeof(rs->part[i].id),
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- (unsigned char *) &rs->part[i]);
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+ if (is_valid_partition(&rs->part[i], rssize)) {
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+ if (blkid_probe_set_magic(pr,
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+ offsetof(struct atari_rootsector, part[i]),
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+ sizeof(rs->part[i].flags) + sizeof(rs->part[i].id),
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+ (unsigned char *) &rs->part[i]))
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+ goto err;
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break;
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}
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}
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@@ -234,7 +265,6 @@ static int probe_atari_pt(blkid_probe pr,
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blkid_partlist_increment_partno(ls);
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continue;
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}
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-
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if (!memcmp(p->id, "XGM", 3)) {
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has_xgm = 1;
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rc = parse_extended(pr, ls, tab, p);
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--
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2.36.1
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