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isofs: validate block number from NFS file handle in isofs_export_iget

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commit 24376458138387fb251e782e624c7776e9826796 upstream.

isofs_fh_to_dentry() and isofs_fh_to_parent() pass an attacker-
controlled block number (ifid->block or ifid->parent_block) from
the NFS file handle to isofs_export_iget(), which only rejects
block == 0 before calling isofs_iget() and ultimately sb_bread().
A crafted file handle with fh_len sufficient to pass the check
added by commit 0405d4b63d08 ("isofs: Prevent the use of too small
fid") can still drive the server to read any in-range block on the
backing device as if it were an iso_directory_record.  That earlier
fix was assigned CVE-2025-37780.

sb_bread() on an out-of-range block returns NULL cleanly via the
EIO path, so there is no memory-safety violation.  For in-range
reads of adjacent-partition data on the same block device, the
unrelated bytes end up in iso_inode_info fields that reach the NFS
client as dentry metadata.  The deployment surface (isofs exported
over NFS from loop-mounted images) is narrow and requires an
authenticated NFS peer, but the malformed-file-handle class is
reportable as hardening next to the existing CVE-2025-37780 fix.

Reject block >= ISOFS_SB(sb)->s_nzones in isofs_export_iget() so
the check covers both isofs_fh_to_dentry() and isofs_fh_to_parent()
call sites with a single line.

Fixes: 0405d4b63d08 ("isofs: Prevent the use of too small fid")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-4-7
Signed-off-by: Michael Bommarito <michael.bommarito@gmail.com>
Link: https://patch.msgid.link/20260419212155.2169382-3-michael.bommarito@gmail.com
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ulrich Hecht <uli@kernel.org>
This commit is contained in:
Michael Bommarito
2026-04-19 17:21:55 -04:00
committed by Ulrich Hecht
parent 297ff5d40b
commit 91602ba3c2
1 changed files with 1 additions and 1 deletions
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2
fs/isofs/export.c
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@ -24,7 +24,7 @@ isofs_export_iget(struct super_block *sb,
{
struct inode *inode;
if (block == 0)
if (block == 0 || block >= ISOFS_SB(sb)->s_nzones)
return ERR_PTR(-ESTALE);
inode = isofs_iget(sb, block, offset);
if (IS_ERR(inode))