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[35.185.214.157]) by smtp.gmail.com with ESMTPSA id n4-20020a170903110400b0016d6963cb12sm8044038plh.304.2022.08.29.14.20.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Aug 2022 14:20:45 -0700 (PDT) Date: Mon, 29 Aug 2022 21:20:42 +0000 From: Carlos Llamas To: Andrew Morton Cc: Greg Kroah-Hartman , Arve =?iso-8859-1?B?SGr4bm5lduVn?= , Todd Kjos , Martijn Coenen , Joel Fernandes , Christian Brauner , Suren Baghdasaryan , Liam Howlett , kernel-team@android.com, syzbot+f7dc54e5be28950ac459@syzkaller.appspotmail.com, syzbot+a75ebe0452711c9e56d9@syzkaller.appspotmail.com, stable@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 1/7] binder: fix alloc->vma_vm_mm null-ptr dereference Message-ID: References: <20220829201254.1814484-1-cmllamas@google.com> <20220829201254.1814484-2-cmllamas@google.com> <20220829133452.cd4d9abe858c940126557c41@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220829133452.cd4d9abe858c940126557c41@linux-foundation.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 29, 2022 at 01:34:52PM -0700, Andrew Morton wrote: > On Mon, 29 Aug 2022 20:12:48 +0000 Carlos Llamas wrote: > > > Syzbot reported a couple issues introduced by commit 44e602b4e52f > > ("binder_alloc: add missing mmap_lock calls when using the VMA"), in > > which we attempt to acquire the mmap_lock when alloc->vma_vm_mm has not > > been initialized yet. > > > > This can happen if a binder_proc receives a transaction without having > > previously called mmap() to setup the binder_proc->alloc space in [1]. > > Also, a similar issue occurs via binder_alloc_print_pages() when we try > > to dump the debugfs binder stats file in [2]. > > Thanks. I assume you'll be merging all these into mainline? Yes, I believe Greg will pick up these patches into his char-misc tree. > > > > > Fixes: 44e602b4e52f ("binder_alloc: add missing mmap_lock calls when using the VMA") > > Reported-by: syzbot+f7dc54e5be28950ac459@syzkaller.appspotmail.com > > Reported-by: syzbot+a75ebe0452711c9e56d9@syzkaller.appspotmail.com > > Cc: # v5.15+ > > 44e602b4e52f is only present in 6.0-rcX? Right, it was just added to the stable queue earlier today: https://lore.kernel.org/all/20220829105814.857786586@linuxfoundation.org/ https://lore.kernel.org/all/20220829105809.855177179@linuxfoundation.org/