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[34.125.67.193]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc1f32f727bsm5288561a12.7.2026.08.31.19.37.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 31 Aug 2026 19:37:36 -0700 (PDT) Date: Tue, 1 Sep 2026 02:37:32 +0000 From: Carlos Llamas To: Greg Kroah-Hartman , Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Todd Kjos , Christian Brauner , Alice Ryhl , Benno Lossin , Gary Guo Cc: kernel-team@android.com, linux-kernel@vger.kernel.org, Suren Baghdasaryan , stable@vger.kernel.org, Sashiko , "open list:RUST [PIN-INIT]:Keyword:bpin-initb|pin_initb|PinInit" Subject: Re: [PATCH 2/2] rust_binder: reject mremap() Message-ID: References: <20260831224145.169403-1-cmllamas@google.com> <20260831224145.169403-2-cmllamas@google.com> Precedence: bulk X-Mailing-List: rust-for-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260831224145.169403-2-cmllamas@google.com> On Mon, Aug 31, 2026 at 10:41:43PM +0000, Carlos Llamas wrote: > Binder does not support mremap() as it caches the mapping address in > Inner::vma_addr. Moving the mapping breaks the IPC communication for the > process and can temporarily leak pages during a shrinker reclaim. > > Fix this by explicitly rejecting the .mremap() operation. > > Cc: stable@vger.kernel.org > Fixes: eafedbc7c050 ("rust_binder: add Rust Binder driver") > Reported-by: Sashiko > Closes: https://sashiko.dev/#/patchset/20260813193433.3318288-1-surenb%40google.com?part=2 > Signed-off-by: Carlos Llamas > --- Sashiko had a couple of good points that I'll be addressing in v2. -- Carlos Llamas