From: rtm@csail.mit.edu
To: Namjae Jeon <linkinjeon@kernel.org>, Hyunchul Lee <hyc.lee@gmail.com>
Cc: linux-fsdevel@vger.kernel.org
Subject: red zone violation in ntfs_runlists_merge()
Date: Sun, 16 Aug 2026 15:06:22 -0400 [thread overview]
Message-ID: <9519.1786907182@localhost> (raw)
The following mounts a corrupt NTFS image that produces a red zone
violation:
# uname -a
Linux xxx 7.2.0-rc7-00016-g3d6d817622b0 #40 SMP PREEMPT_DYNAMIC Wed Aug 12 13:01:40 EDT 2026 x86_64 x86_64 x86_64 GNU/Linux
# wget http://www.rtmrtm.org/rtm/ntfs2b.img.gz
# gunzip ntfs2b.img.gz
mount -t ntfs -o loop ntfs2b.img /mnt
[Right Redzone overwritten] 0xffff888100321300-0xffff888100321307 @offset=4864.
...
The overrun occurs in the last three lines of this code in
ntfs_runlists_merge():
drl[ds].length = marker_vcn - drl[ds].vcn;
/* Finally add the ENOENT terminator. */
ds++;
if (!slots) {
drl = ntfs_rl_realloc_nofail(drl, ds, ds + 1);
rtm_check(drl);
*new_rl_count += 1;
}
drl[ds].vcn = marker_vcn;
drl[ds].lcn = LCN_ENOENT;
drl[ds].length = (s64)0;
After the ds++, ds is too large, but slots == 1.
Robert Morris
rtm@mit.edu
reply other threads:[~2026-08-16 19:40 UTC|newest]
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