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hfsplus: refuse to mount volumes larger than 2TB

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As found in <http://bugs.debian.org/550010>, hfsplus is using type u32
rather than sector_t for some sector number calculations.

In particular, hfsplus_get_block() does:

        u32 ablock, dblock, mask;
...
        map_bh(bh_result, sb, (dblock << HFSPLUS_SB(sb).fs_shift) + HFSPLUS_SB(sb).blockoffset + (iblock & mask));

I am not confident that I can find and fix all cases where a sector number
may be truncated.  For now, avoid data loss by refusing to mount HFS+
volumes with more than 2^32 sectors (2TB).

[[email protected]: fix 32 and 64-bit issues]
Signed-off-by: Ben Hutchings <[email protected]>
Cc: Eric Sesterhenn <[email protected]>
Cc: Roman Zippel <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Ben Hutchings 2009-10-26 16:49:51 -07:00 • committed by Linus Torvalds
commit 5c36fe3d87
1 changed files with 4 additions and 0 deletions
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4
fs/hfsplus/wrapper.c
View file

@ -99,6 +99,10 @@ int hfsplus_read_wrapper(struct super_block *sb)
if (hfsplus_get_last_session(sb, &part_start, &part_size))
return -EINVAL;
if ((u64)part_start + part_size > 0x100000000ULL) {
pr_err("hfs: volumes larger than 2TB are not supported yet\n");
return -EINVAL;
}
while (1) {
bh = sb_bread512(sb, part_start + HFSPLUS_VOLHEAD_SECTOR, vhdr);
if (!bh)