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ecryptfs: reject too-small tag 70 packets

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ecryptfs_parse_tag_70_packet() subtracts fixed metadata fields from the
parsed packet body size to derive the encrypted filename size.  A
malformed packet with a body smaller than those fixed fields can underflow
that size calculation.

Reject tag 70 packets before the subtraction unless the body contains the
signature, cipher code, and at least one byte of encrypted filename data.

Fixes: 9c79f34f7e ("eCryptfs: Filename Encryption: Tag 70 packets")
Cc: <stable@vger.kernel.org>
Signed-off-by: Yichong Chen <chenyichong@uniontech.com>
Signed-off-by: Tyler Hicks <code@tyhicks.com>
This commit is contained in:
Yichong Chen
2026-07-15 13:20:06 +08:00
committed by Tyler Hicks
parent 8b2ec0f56f
commit e97bbe1b2b
1 changed files with 6 additions and 0 deletions
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6
fs/ecryptfs/keystore.c
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@@ -894,6 +894,12 @@ ecryptfs_parse_tag_70_packet(char **filename, size_t *filename_size,
"rc = [%d]\n", __func__, rc);
goto out;
}
if (s->parsed_tag_70_packet_size < (ECRYPTFS_SIG_SIZE + 2)) {
ecryptfs_printk(KERN_WARNING, "Invalid packet size [%zd]\n",
s->parsed_tag_70_packet_size);
rc = -EINVAL;
goto out;
}
s->block_aligned_filename_size = (s->parsed_tag_70_packet_size
- ECRYPTFS_SIG_SIZE - 1);
if ((1 + s->packet_size_len + s->parsed_tag_70_packet_size)