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| author | Ben Hutchings <ben@decadent.org.uk> | 2009-10-26 16:49:51 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-10-29 07:39:27 -0700 |
| commit | 5c36fe3d87b3f0c85894a49193c66096a3d6b26f (patch) | |
| tree | 8c2953fe31004115794e7834cfbc7136186aca5c | |
| parent | b5654f5e7fc414a6e69b3647db2b043257c9e62e (diff) | |
| download | linux-5c36fe3d87b3f0c85894a49193c66096a3d6b26f.tar.gz linux-5c36fe3d87b3f0c85894a49193c66096a3d6b26f.tar.bz2 linux-5c36fe3d87b3f0c85894a49193c66096a3d6b26f.zip | |
hfsplus: refuse to mount volumes larger than 2TB
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).
[akpm@linux-foundation.org: fix 32 and 64-bit issues]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Cc: Eric Sesterhenn <snakebyte@gmx.de>
Cc: Roman Zippel <zippel@linux-m68k.org>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/hfsplus/wrapper.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/hfsplus/wrapper.c b/fs/hfsplus/wrapper.c index 175d08eacc86..bed78ac8f6d1 100644 --- a/fs/hfsplus/wrapper.c +++ b/fs/hfsplus/wrapper.c @@ -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) |