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Tue, 05 May 2026 06:42:52 -0700 (PDT) Received: from [192.168.88.32] ([212.105.155.47]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-48d149d49acsm30503175e9.1.2026.05.05.06.42.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 05 May 2026 06:42:52 -0700 (PDT) Message-ID: <30f588ad-cf80-432b-bde3-13b3c0d5a124@redhat.com> Date: Tue, 5 May 2026 15:42:46 +0200 Precedence: bulk X-Mailing-List: linux-hyperv@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH net, v3] net: mana: Fix crash from unvalidated SHM offset read from BAR0 during FLR To: Dipayaan Roy , kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org, decui@microsoft.com, andrew+netdev@lunn.ch, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, leon@kernel.org, longli@microsoft.com, kotaranov@microsoft.com, horms@kernel.org, shradhagupta@linux.microsoft.com, ssengar@linux.microsoft.com, ernis@linux.microsoft.com, shirazsaleem@microsoft.com, linux-hyperv@vger.kernel.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, stephen@networkplumber.org, jacob.e.keller@intel.com, dipayanroy@microsoft.com, leitao@debian.org, kees@kernel.org, john.fastabend@gmail.com, hawk@kernel.org, bpf@vger.kernel.org, daniel@iogearbox.net, ast@kernel.org, sdf@fomichev.me, yury.norov@gmail.com References: Content-Language: en-US From: Paolo Abeni In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 5/1/26 4:47 AM, Dipayaan Roy wrote: > @@ -73,10 +74,28 @@ static int mana_gd_init_pf_regs(struct pci_dev *pdev) > gc->phys_db_page_base = gc->bar0_pa + gc->db_page_off; > > sriov_base_off = mana_gd_r64(gc, GDMA_SRIOV_REG_CFG_BASE_OFF); > + if (sriov_base_off >= gc->bar0_size || > + gc->bar0_size - sriov_base_off < > + GDMA_PF_REG_SHM_OFF + sizeof(u64) || > + !IS_ALIGNED(sriov_base_off, sizeof(u64))) { > + dev_err(gc->dev, > + "SRIOV base offset 0x%llx out of range or unaligned (BAR0 size 0x%llx)\n", > + sriov_base_off, (u64)gc->bar0_size); > + return -EPROTO; > + } I think that the additional fix suggested by sashiko is really worthy, but should go in a separate patch. @Dipayaan: please follow-up on that one, thanks! Paolo