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Thu, 25 Jun 2026 03:40:09 -0700 (PDT) From: Keshav Verma To: Alice Ryhl Cc: Carlos Llamas , Greg Kroah-Hartman , =?UTF-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= , Todd Kjos , Christian Brauner , Miguel Ojeda , Boqun Feng , Gary Guo , linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, Keshav Verma , stable@kernel.org Subject: [PATCH v3] rust_binder: reject context manager self-transaction Date: Thu, 25 Jun 2026 16:09:57 +0530 Message-Id: <20260625103957.730-1-iganschel@gmail.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20260621210134.441-1-iganschel@gmail.com> References: <20260621210134.441-1-iganschel@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Rust binder resolved handle 0 to the context manager node, but it does not reject the case where the caller owns the same node. The C binder driver rejects transactions from the context-manager process to handle 0 after resolving the target node. Match that behavior in Rust Binder by rejecting handle 0 transactions when the resolved context-manager node is owned by the calling process. This applies to both synchronous and oneway transactions because both paths resolve the target through Process::get_transaction_node(). Cc: stable@kernel.org Fixes: eafedbc7c050 ("rust_binder: add Rust Binder driver") Signed-off-by: Keshav Verma --- Changes in v3: - Keep the check scoped to the Binder Process object, allowing transactions between different binder fds owned by the same OS process. Changes in v2: - Compare the underlying OS process task instead of Rust Binder Process object. drivers/android/binder/process.rs | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/android/binder/process.rs b/drivers/android/binder/process.rs index d09facebddf6..5befff9cf5b9 100644 --- a/drivers/android/binder/process.rs +++ b/drivers/android/binder/process.rs @@ -901,7 +901,11 @@ pub(crate) fn insert_or_update_handle( pub(crate) fn get_transaction_node(&self, handle: u32) -> BinderResult { // When handle is zero, try to get the context manager. if handle == 0 { - Ok(self.ctx.get_manager_node(true)?) + let node_ref = self.ctx.get_manager_node(true)?; + if core::ptr::eq(self, &*node_ref.node.owner) { + return Err(EINVAL.into()); + } + Ok(node_ref) } else { Ok(self.get_node_from_handle(handle, true)?) } -- 2.39.5