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[83.52.55.163]) by smtp.gmail.com with ESMTPSA id s16sm8505653wrw.44.2021.08.23.09.42.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 23 Aug 2021 09:42:21 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [RFC PATCH v2 5/5] softmmu/physmem: Have flaview API check MemTxAttrs::bus_perm field Date: Mon, 23 Aug 2021 18:41:57 +0200 Message-Id: <20210823164157.751807-6-philmd@redhat.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210823164157.751807-1-philmd@redhat.com> References: <20210823164157.751807-1-philmd@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=216.205.24.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.743, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , David Hildenbrand , Jason Wang , Li Qiang , Qiuhao Li , Peter Xu , Alexander Bulekov , qemu-arm@nongnu.org, Gerd Hoffmann , Stefan Hajnoczi , Paolo Bonzini , "Edgar E . Iglesias" , =?utf-8?q?Philippe_Mathieu?= =?utf-8?q?-Daud=C3=A9?= Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Check bus permission in flatview_access_allowed() before running any bus transaction. There is not change for the default case (MEMTXPERM_UNSPECIFIED). The MEMTXPERM_UNRESTRICTED case works as an allow list. Devices using it won't be checked by flatview_access_allowed(). The only deny list equivalent is MEMTXPERM_RAM_DEVICE: devices using this flag will reject transactions and set the optional MemTxResult to MEMTX_BUS_ERROR. Signed-off-by: Philippe Mathieu-Daudé --- softmmu/physmem.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/softmmu/physmem.c b/softmmu/physmem.c index 0d31a2f4199..329542dba75 100644 --- a/softmmu/physmem.c +++ b/softmmu/physmem.c @@ -2772,7 +2772,22 @@ static inline bool flatview_access_allowed(MemoryRegion *mr, MemTxAttrs attrs, hwaddr addr, hwaddr len, MemTxResult *result) { - return true; + if (unlikely(attrs.bus_perm == MEMTXPERM_RAM_DEVICE)) { + if (memory_region_is_ram(mr) || memory_region_is_ram_device(mr)) { + return true; + } + qemu_log_mask(LOG_GUEST_ERROR, + "Invalid access to non-RAM device at " + "addr 0x%" HWADDR_PRIX ", size %" HWADDR_PRIu ", " + "region '%s'\n", addr, len, memory_region_name(mr)); + if (result) { + *result |= MEMTX_BUS_ERROR; + } + return false; + } else { + /* MEMTXPERM_UNRESTRICTED and MEMTXPERM_UNSPECIFIED cases */ + return true; + } } /* Called within RCU critical section. */