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Thu, 10 Mar 2022 23:56:25 +0000 Received: by kubenode537.mail-prod1.omega.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 85c60a74110af086a1e93bbc48c45823; Thu, 10 Mar 2022 23:56:22 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Cc: casey@schaufler-ca.com, linux-audit@redhat.com, keescook@chromium.org, john.johansen@canonical.com, penguin-kernel@i-love.sakura.ne.jp, paul@paul-moore.com, stephen.smalley.work@gmail.com, linux-kernel@vger.kernel.org Subject: [PATCH v33 20/29] binder: Pass LSM identifier for confirmation Date: Thu, 10 Mar 2022 15:46:23 -0800 Message-Id: <20220310234632.16194-21-casey@schaufler-ca.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220310234632.16194-1-casey@schaufler-ca.com> References: <20220310234632.16194-1-casey@schaufler-ca.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Send an identifier for the security module interface_lsm along with the security context. This allows the receiver to verify that the receiver and the sender agree on which security module's context is being used. If they don't agree the message is rejected. Signed-off-by: Casey Schaufler --- drivers/android/binder.c | 21 +++++++++++++++++++++ drivers/android/binder_internal.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index b0b0c132a247..259f5e38e6ba 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3024,6 +3024,7 @@ static void binder_transaction(struct binder_proc *proc, ALIGN(extra_buffers_size, sizeof(void *)) - ALIGN(lsmctx.len, sizeof(u64)); + t->security_interface = lsm_task_ilsm(current); t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset; err = binder_alloc_copy_to_buffer(&target_proc->alloc, t->buffer, buf_offset, @@ -4453,6 +4454,26 @@ static int binder_thread_read(struct binder_proc *proc, tr.secctx = t->security_ctx; if (t->security_ctx) { + int to_ilsm = lsm_task_ilsm(current); + int from_ilsm = t->security_interface; + + if (to_ilsm == LSMBLOB_INVALID) + to_ilsm = 0; + if (from_ilsm == LSMBLOB_INVALID) + from_ilsm = 0; + /* + * The sender provided a security context from + * a different security module than the one this + * process wants to report if these don't match. + */ + if (from_ilsm != to_ilsm) { + if (t_from) + binder_thread_dec_tmpref(t_from); + + binder_cleanup_transaction(t, "security context mismatch", + BR_FAILED_REPLY); + return -EINVAL; + } cmd = BR_TRANSACTION_SEC_CTX; trsize = sizeof(tr); } diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h index d6b6b8cb7346..e3a0718ce17c 100644 --- a/drivers/android/binder_internal.h +++ b/drivers/android/binder_internal.h @@ -545,6 +545,7 @@ struct binder_transaction { long saved_priority; kuid_t sender_euid; struct list_head fd_fixups; + int security_interface; binder_uintptr_t security_ctx; /** * @lock: protects @from, @to_proc, and @to_thread -- 2.31.1 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EB1DCC433F5 for ; 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Thu, 10 Mar 2022 23:56:25 +0000 Received: by kubenode537.mail-prod1.omega.gq1.yahoo.com (VZM Hermes SMTP Server) with ESMTPA ID 85c60a74110af086a1e93bbc48c45823; Thu, 10 Mar 2022 23:56:22 +0000 (UTC) From: Casey Schaufler To: casey.schaufler@intel.com, jmorris@namei.org, linux-security-module@vger.kernel.org, selinux@vger.kernel.org Subject: [PATCH v33 20/29] binder: Pass LSM identifier for confirmation Date: Thu, 10 Mar 2022 15:46:23 -0800 Message-Id: <20220310234632.16194-21-casey@schaufler-ca.com> In-Reply-To: <20220310234632.16194-1-casey@schaufler-ca.com> References: <20220310234632.16194-1-casey@schaufler-ca.com> MIME-Version: 1.0 X-Mimecast-Impersonation-Protect: Policy=CLT - Impersonation Protection Definition; Similar Internal Domain=false; Similar Monitored External Domain=false; Custom External Domain=false; Mimecast External Domain=false; Newly Observed Domain=false; Internal User Name=false; Custom Display Name List=false; Reply-to Address Mismatch=false; Targeted Threat Dictionary=false; Mimecast Threat Dictionary=false; Custom Threat Dictionary=false X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 X-BeenThere: linux-audit@redhat.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux Audit Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: john.johansen@canonical.com, linux-kernel@vger.kernel.org, linux-audit@redhat.com Errors-To: linux-audit-bounces@redhat.com Sender: "Linux-audit" X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=linux-audit-bounces@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Send an identifier for the security module interface_lsm along with the security context. This allows the receiver to verify that the receiver and the sender agree on which security module's context is being used. If they don't agree the message is rejected. Signed-off-by: Casey Schaufler --- drivers/android/binder.c | 21 +++++++++++++++++++++ drivers/android/binder_internal.h | 1 + 2 files changed, 22 insertions(+) diff --git a/drivers/android/binder.c b/drivers/android/binder.c index b0b0c132a247..259f5e38e6ba 100644 --- a/drivers/android/binder.c +++ b/drivers/android/binder.c @@ -3024,6 +3024,7 @@ static void binder_transaction(struct binder_proc *proc, ALIGN(extra_buffers_size, sizeof(void *)) - ALIGN(lsmctx.len, sizeof(u64)); + t->security_interface = lsm_task_ilsm(current); t->security_ctx = (uintptr_t)t->buffer->user_data + buf_offset; err = binder_alloc_copy_to_buffer(&target_proc->alloc, t->buffer, buf_offset, @@ -4453,6 +4454,26 @@ static int binder_thread_read(struct binder_proc *proc, tr.secctx = t->security_ctx; if (t->security_ctx) { + int to_ilsm = lsm_task_ilsm(current); + int from_ilsm = t->security_interface; + + if (to_ilsm == LSMBLOB_INVALID) + to_ilsm = 0; + if (from_ilsm == LSMBLOB_INVALID) + from_ilsm = 0; + /* + * The sender provided a security context from + * a different security module than the one this + * process wants to report if these don't match. + */ + if (from_ilsm != to_ilsm) { + if (t_from) + binder_thread_dec_tmpref(t_from); + + binder_cleanup_transaction(t, "security context mismatch", + BR_FAILED_REPLY); + return -EINVAL; + } cmd = BR_TRANSACTION_SEC_CTX; trsize = sizeof(tr); } diff --git a/drivers/android/binder_internal.h b/drivers/android/binder_internal.h index d6b6b8cb7346..e3a0718ce17c 100644 --- a/drivers/android/binder_internal.h +++ b/drivers/android/binder_internal.h @@ -545,6 +545,7 @@ struct binder_transaction { long saved_priority; kuid_t sender_euid; struct list_head fd_fixups; + int security_interface; binder_uintptr_t security_ctx; /** * @lock: protects @from, @to_proc, and @to_thread -- 2.31.1 -- Linux-audit mailing list Linux-audit@redhat.com https://listman.redhat.com/mailman/listinfo/linux-audit