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[34.105.23.239]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-359a8f3c23bsm1216444a91.1.2026.03.04.14.53.45 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 04 Mar 2026 14:53:45 -0800 (PST) Date: Wed, 4 Mar 2026 22:53:41 +0000 From: David Matlack To: Raghavendra Rao Ananta Cc: Alex Williamson , Vipin Sharma , Josh Hilke , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 3/8] vfio: selftests: Introduce a sysfs lib Message-ID: References: <20260303193822.2526335-1-rananta@google.com> <20260303193822.2526335-4-rananta@google.com> Precedence: bulk X-Mailing-List: kvm@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: <20260303193822.2526335-4-rananta@google.com> On 2026-03-03 07:38 PM, Raghavendra Rao Ananta wrote: > + ret = readlink(path, vf_path, PATH_MAX); > + VFIO_ASSERT_NE(ret, -1); > + vf_path[ret] = '\0'; ... > + ret = readlink(path, dev_iommu_group_path, sizeof(dev_iommu_group_path)); > + VFIO_ASSERT_NE(ret, -1, "Failed to get the IOMMU group for device: %s\n", bdf); > + dev_iommu_group_path[ret] = '\0'; ... > + ret = readlink(path, driver_path, PATH_MAX); > + if (ret == -1) { > + free(out_driver); > + > + if (errno == ENOENT) > + return NULL; > + > + VFIO_FAIL("Failed to read %s\n", path); > + } > + driver_path[ret] = '\0'; These can all write off the end of the buffer if ret == PATH_MAX. Also there is an inconsistency in these calls. 2 use hard-coded PATH_MAX while the other uses sizeof(). Perhaps add a wrapper to handle all the details? #define readlink_safe(path, buf) ({ \ int __ret = readlink(_path, _buf, sizeof(_buf) - 1); \ if (__ret != -1) \ _buf[__ret] = 0; \ __ret; })