* [PATCH] fs/ecryptfs: fix slab-out-of-bounds read in ecryptfs_verify_auth_tok_from_key
@ 2026-09-17 4:45 Nguyen Duy Nhat Anh
0 siblings, 0 replies; 2+ messages in thread
From: Nguyen Duy Nhat Anh @ 2026-09-17 4:45 UTC (permalink / raw)
To: code
Cc: blum, rdunlap, chenyichong, zhangzekun, ebiggers, ecryptfs,
linux-kernel, syzbot+b9529ebe6a9394ddf825, Nguyen Duy Nhat Anh
Add a bounds check in ecryptfs_get_key_payload_data() to ensure the
key payload datalen is at least sizeof(struct ecryptfs_auth_tok) before
returning the pointer. This prevents out-of-bounds reads when userspace
supplies a short payload via add_key().
Reported-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
Signed-off-by: Nguyen Duy Nhat Anh <neganhat@gmail.com>
---
fs/ecryptfs/ecryptfs_kernel.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 58165928ed1e..3baccd4143e8 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -124,6 +124,9 @@ ecryptfs_get_key_payload_data(struct key *key)
if (!ukp)
return ERR_PTR(-EKEYREVOKED);
+ if (ukp->datalen < sizeof(struct ecryptfs_auth_tok))
+ return ERR_PTR(-EINVAL);
+
return (struct ecryptfs_auth_tok *)ukp->data;
}
--
2.55.0
^ permalink raw reply [flat|nested] 2+ messages in thread
* [PATCH] fs/ecryptfs: fix slab-out-of-bounds read in ecryptfs_verify_auth_tok_from_key
@ 2026-09-17 4:43 Nguyen Duy Nhat Anh
0 siblings, 0 replies; 2+ messages in thread
From: Nguyen Duy Nhat Anh @ 2026-09-17 4:43 UTC (permalink / raw)
To: code
Cc: blum, rdunlap, chenyichong, zhangzekun, ebiggers, ecryptfs,
linux-kernel, syzbot+b9529ebe6a9394ddf825, Nguyen Duy Nhat Anh
Add a bounds check in ecryptfs_get_key_payload_data() to ensure the
key payload datalen is at least sizeof(struct ecryptfs_auth_tok) before
returning the pointer. This prevents out-of-bounds reads when userspace
supplies a short payload via add_key().
Reported-by: syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=b9529ebe6a9394ddf825
Signed-off-by: Nguyen Duy Nhat Anh <neganhat@gmail.com>
---
fs/ecryptfs/ecryptfs_kernel.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/fs/ecryptfs/ecryptfs_kernel.h b/fs/ecryptfs/ecryptfs_kernel.h
index 58165928ed1e..3baccd4143e8 100644
--- a/fs/ecryptfs/ecryptfs_kernel.h
+++ b/fs/ecryptfs/ecryptfs_kernel.h
@@ -124,6 +124,9 @@ ecryptfs_get_key_payload_data(struct key *key)
if (!ukp)
return ERR_PTR(-EKEYREVOKED);
+ if (ukp->datalen < sizeof(struct ecryptfs_auth_tok))
+ return ERR_PTR(-EINVAL);
+
return (struct ecryptfs_auth_tok *)ukp->data;
}
--
2.55.0
^ permalink raw reply [flat|nested] 2+ messages in thread
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