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[69.131.217.18]) by smtp.gmail.com with ESMTPSA id 00721157ae682-79876c53644sm78681887b3.39.2026.03.04.10.57.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 04 Mar 2026 10:57:35 -0800 (PST) Message-ID: Date: Wed, 4 Mar 2026 13:57:31 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Possible newline injection into fdinfo To: Christian Brauner Cc: Linux kernel mailing list , dri-devel@lists.freedesktop.org, linux-fsdevel@vger.kernel.org References: <08f230b4-8c01-45b8-9956-7cfb9f82eeff@gmail.com> <20260304-wertigkeit-rockkonzert-ac7270334804@brauner> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; keydata= xsFNBFp+A0oBEADffj6anl9/BHhUSxGTICeVl2tob7hPDdhHNgPR4C8xlYt5q49yB+l2nipd aq+4Gk6FZfqC825TKl7eRpUjMriwle4r3R0ydSIGcy4M6eb0IcxmuPYfbWpr/si88QKgyGSV Z7GeNW1UnzTdhYHuFlk8dBSmB1fzhEYEk0RcJqg4AKoq6/3/UorR+FaSuVwT7rqzGrTlscnT DlPWgRzrQ3jssesI7sZLm82E3pJSgaUoCdCOlL7MMPCJwI8JpPlBedRpe9tfVyfu3euTPLPx wcV3L/cfWPGSL4PofBtB8NUU6QwYiQ9Hzx4xOyn67zW73/G0Q2vPPRst8LBDqlxLjbtx/WLR 6h3nBc3eyuZ+q62HS1pJ5EvUT1vjyJ1ySrqtUXWQ4XlZyoEFUfpJxJoN0A9HCxmHGVckzTRl 5FMWo8TCniHynNXsBtDQbabt7aNEOaAJdE7to0AH3T/Bvwzcp0ZJtBk0EM6YeMLtotUut7h2 Bkg1b//r6bTBswMBXVJ5H44Qf0+eKeUg7whSC9qpYOzzrm7+0r9F5u3qF8ZTx55TJc2g656C 9a1P1MYVysLvkLvS4H+crmxA/i08Tc1h+x9RRvqba4lSzZ6/Tmt60DPM5Sc4R0nSm9BBff0N m0bSNRS8InXdO1Aq3362QKX2NOwcL5YaStwODNyZUqF7izjK4QARAQABzTxEZW1pIE1hcmll IE9iZW5vdXIgKGxvdmVyIG9mIGNvZGluZykgPGRlbWlvYmVub3VyQGdtYWlsLmNvbT7CwXgE EwECACIFAlp+A0oCGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJELKItV//nCLBhr8Q AK/xrb4wyi71xII2hkFBpT59ObLN+32FQT7R3lbZRjVFjc6yMUjOb1H/hJVxx+yo5gsSj5LS 9AwggioUSrcUKldfA/PKKai2mzTlUDxTcF3vKx6iMXKA6AqwAw4B57ZEJoMM6egm57TV19kz PMc879NV2nc6+elaKl+/kbVeD3qvBuEwsTe2Do3HAAdrfUG/j9erwIk6gha/Hp9yZlCnPTX+ VK+xifQqt8RtMqS5R/S8z0msJMI/ajNU03kFjOpqrYziv6OZLJ5cuKb3bZU5aoaRQRDzkFIR 6aqtFLTohTo20QywXwRa39uFaOT/0YMpNyel0kdOszFOykTEGI2u+kja35g9TkH90kkBTG+a EWttIht0Hy6YFmwjcAxisSakBuHnHuMSOiyRQLu43ej2+mDWgItLZ48Mu0C3IG1seeQDjEYP tqvyZ6bGkf2Vj+L6wLoLLIhRZxQOedqArIk/Sb2SzQYuxN44IDRt+3ZcDqsPppoKcxSyd1Ny 2tpvjYJXlfKmOYLhTWs8nwlAlSHX/c/jz/ywwf7eSvGknToo1Y0VpRtoxMaKW1nvH0OeCSVJ itfRP7YbiRVc2aNqWPCSgtqHAuVraBRbAFLKh9d2rKFB3BmynTUpc1BQLJP8+D5oNyb8Ts4x Xd3iV/uD8JLGJfYZIR7oGWFLP4uZ3tkneDfYzsFNBFp+A0oBEAC9ynZI9LU+uJkMeEJeJyQ/ 8VFkCJQPQZEsIGzOTlPnwvVna0AS86n2Z+rK7R/usYs5iJCZ55/JISWd8xD57ue0eB47bcJv VqGlObI2DEG8TwaW0O0duRhDgzMEL4t1KdRAepIESBEA/iPpI4gfUbVEIEQuqdqQyO4GAe+M kD0Hy5JH/0qgFmbaSegNTdQg5iqYjRZ3ttiswalql1/iSyv1WYeC1OAs+2BLOAT2NEggSiVO txEfgewsQtCWi8H1SoirakIfo45Hz0tk/Ad9ZWh2PvOGt97Ka85o4TLJxgJJqGEnqcFUZnJJ riwoaRIS8N2C8/nEM53jb1sH0gYddMU3QxY7dYNLIUrRKQeNkF30dK7V6JRH7pleRlf+wQcN fRAIUrNlatj9TxwivQrKnC9aIFFHEy/0mAgtrQShcMRmMgVlRoOA5B8RTulRLCmkafvwuhs6 dCxN0GNAORIVVFxjx9Vn7OqYPgwiofZ6SbEl0hgPyWBQvE85klFLZLoj7p+joDY1XNQztmfA rnJ9x+YV4igjWImINAZSlmEcYtd+xy3Li/8oeYDAqrsnrOjb+WvGhCykJk4urBog2LNtcyCj kTs7F+WeXGUo0NDhbd3Z6AyFfqeF7uJ3D5hlpX2nI9no/ugPrrTVoVZAgrrnNz0iZG2DVx46 x913pVKHl5mlYQARAQABwsFfBBgBAgAJBQJafgNKAhsMAAoJELKItV//nCLBwNIP/AiIHE8b oIqReFQyaMzxq6lE4YZCZNj65B/nkDOvodSiwfwjjVVE2V3iEzxMHbgyTCGA67+Bo/d5aQGj gn0TPtsGzelyQHipaUzEyrsceUGWYoKXYyVWKEfyh0cDfnd9diAm3VeNqchtcMpoehETH8fr RHnJdBcjf112PzQSdKC6kqU0Q196c4Vp5HDOQfNiDnTf7gZSj0BraHOByy9LEDCLhQiCmr+2 E0rW4tBtDAn2HkT9uf32ZGqJCn1O+2uVfFhGu6vPE5qkqrbSE8TG+03H8ecU2q50zgHWPdHM OBvy3EhzfAh2VmOSTcRK+tSUe/u3wdLRDPwv/DTzGI36Kgky9MsDC5gpIwNbOJP2G/q1wT1o Gkw4IXfWv2ufWiXqJ+k7HEi2N1sree7Dy9KBCqb+ca1vFhYPDJfhP75I/VnzHVssZ/rYZ9+5 1yDoUABoNdJNSGUYl+Yh9Pw9pE3Kt4EFzUlFZWbE4xKL/NPno+z4J9aWemLLszcYz/u3XnbO vUSQHSrmfOzX3cV4yfmjM5lewgSstoxGyTx2M8enslgdXhPthZlDnTnOT+C+OTsh8+m5tos8 HQjaPM01MKBiAqdPgksm1wu2DrrwUi6ChRVTUBcj6+/9IJ81H2P2gJk3Ls3AVIxIffLoY34E +MYSfkEjBz0E8CLOcAw7JIwAaeBT In-Reply-To: <20260304-wertigkeit-rockkonzert-ac7270334804@brauner> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------Uba9ZaUVB6ePdYKbae9up7dK" X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------Uba9ZaUVB6ePdYKbae9up7dK Content-Type: multipart/mixed; boundary="------------yffwiW0ugdUjjSBeahnhvoqi"; protected-headers="v1" Message-ID: Date: Wed, 4 Mar 2026 13:57:31 -0500 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Possible newline injection into fdinfo To: Christian Brauner Cc: Linux kernel mailing list , dri-devel@lists.freedesktop.org, linux-fsdevel@vger.kernel.org References: <08f230b4-8c01-45b8-9956-7cfb9f82eeff@gmail.com> <20260304-wertigkeit-rockkonzert-ac7270334804@brauner> Content-Language: en-US From: Demi Marie Obenour Autocrypt: addr=demiobenour@gmail.com; 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boundary="------------xmLRFbhrUuTXb9myQAfQbFUV" --------------xmLRFbhrUuTXb9myQAfQbFUV Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 3/4/26 08:03, Christian Brauner wrote: > On Wed, Mar 04, 2026 at 01:53:42AM -0500, Demi Marie Obenour wrote: >> I noticed potentially missing input sanitization in dma_buf_set_name()= , >> which is reachable from DMA_BUF_SET_NAME. This allows inserting a nam= e >> containing a newline, which is then used to construct the contents of >> /proc/PID/task/TID/fdinfo/FD. This could confuse userspace programs >> that access this data, possibly tricking them into thinking a file >> descriptor is of a different type than it actually is. >> >> Other code might have similar bugs. For instance, there is code that >> uses a sysfs path, a driver name, or a device name from /dev. It is >> possible to sanitize the first, and the second and third should come >> from trusted sources within the kernel itself. The last area where >> I found a potential problem is BPF. I don't know if this can happen. >> >> I think this should be fixed by either sanitizing data on write >> (by limiting the allowed characters in dma_buf_set_name()), on read >> (by using one of the formats that escapes special characters), or both= =2E >> >> Is there a better way to identify that a file descriptor is of >> a particular type, such as an eventfd? fdinfo is subject to >=20 > The problem is that most of the anonymous inodes share a single > anonymous inode so any uapi that returns information based inode->i_op > is not going to be usable. >=20 >> bugs of this type, which might happen again. readlink() reports >> "anon_inode:[eventfd]" and S_IFMT reports a mode of 0, but but my >=20 > That is definitely uapi by now. We've tried to change S_IFMT and it > breaks lsfd and other tools so we can't reasonably change it. In fact, > pidfds pretend to be anon_inode even though they're not simply because > some tools parse that out. Does Linux guarantee that anything that is not an anonymous inode will have (st_mode & S_IFMT) !=3D 0? 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