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Wed, 16 Sep 2026 21:46:22 -0700 (PDT) Received: from casta ([2401:d800:9045:4f1a:4e6d:4c1f:5b78:9e96]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-39e360aa230sm2717236a91.14.2026.09.16.21.46.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 16 Sep 2026 21:46:22 -0700 (PDT) From: Nguyen Duy Nhat Anh To: code@tyhicks.com Cc: blum@kernel.org, rdunlap@infradead.org, chenyichong@uniontech.com, zhangzekun@huwawei.com, ebiggers@kernel.org, ecryptfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzbot+b9529ebe6a9394ddf825@syzkaller.appspotmail.com, Nguyen Duy Nhat Anh Subject: [PATCH] fs/ecryptfs: fix slab-out-of-bounds read in ecryptfs_verify_auth_tok_from_key Date: Thu, 17 Sep 2026 11:45:58 +0700 Message-ID: <20260917044558.41677-1-neganhat@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: ecryptfs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 --- 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