CVE-2023-52486 (GCVE-0-2023-52486)
Vulnerability from cvelistv5
Published
2024-02-29 15:52
Modified
2025-05-04 07:37
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Don't unref the same fb many times by mistake due to deadlock handling If we get a deadlock after the fb lookup in drm_mode_page_flip_ioctl() we proceed to unref the fb and then retry the whole thing from the top. But we forget to reset the fb pointer back to NULL, and so if we then get another error during the retry, before the fb lookup, we proceed the unref the same fb again without having gotten another reference. The end result is that the fb will (eventually) end up being freed while it's still in use. Reset fb to NULL once we've unreffed it to avoid doing it again until we've done another fb lookup. This turned out to be pretty easy to hit on a DG2 when doing async flips (and CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). The first symptom I saw that drm_closefb() simply got stuck in a busy loop while walking the framebuffer list. Fortunately I was able to convince it to oops instead, and from there it was easier to track down the culprit.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/376e21a9e4c2c63ee5d8d3aa74be5082c3882229 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/62f2e79cf9f4f47cc9dea9cebdf58d9f7b5695e0 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/9dd334a8245011ace45e53298175c7b659edb3e7 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/b4af63da9d94986c529d74499fdfe44289acd551 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/bfd0feb1b109cb63b87fdcd00122603787c75a1a Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/cb4daf271302d71a6b9a7c01bd0b6d76febd8f0c Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/d7afdf360f4ac142832b098b4de974e867cc063c Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/f55261469be87c55df13db76dc945f6bcd825105 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/376e21a9e4c2c63ee5d8d3aa74be5082c3882229 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/62f2e79cf9f4f47cc9dea9cebdf58d9f7b5695e0 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/9dd334a8245011ace45e53298175c7b659edb3e7 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/b4af63da9d94986c529d74499fdfe44289acd551 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/bfd0feb1b109cb63b87fdcd00122603787c75a1a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/cb4daf271302d71a6b9a7c01bd0b6d76febd8f0c Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/d7afdf360f4ac142832b098b4de974e867cc063c Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/f55261469be87c55df13db76dc945f6bcd825105 Patch
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html Mailing List
af854a3a-2127-422b-91ae-364da2661108 https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html Mailing List
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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    "nvd": "{\"cve\":{\"id\":\"CVE-2023-52486\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-03-11T18:15:16.427\",\"lastModified\":\"2025-01-14T15:01:47.313\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm: Don\u0027t unref the same fb many times by mistake due to deadlock handling\\n\\nIf we get a deadlock after the fb lookup in drm_mode_page_flip_ioctl()\\nwe proceed to unref the fb and then retry the whole thing from the top.\\nBut we forget to reset the fb pointer back to NULL, and so if we then\\nget another error during the retry, before the fb lookup, we proceed\\nthe unref the same fb again without having gotten another reference.\\nThe end result is that the fb will (eventually) end up being freed\\nwhile it\u0027s still in use.\\n\\nReset fb to NULL once we\u0027ve unreffed it to avoid doing it again\\nuntil we\u0027ve done another fb lookup.\\n\\nThis turned out to be pretty easy to hit on a DG2 when doing async\\nflips (and CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). The first symptom I\\nsaw that drm_closefb() simply got stuck in a busy loop while walking\\nthe framebuffer list. Fortunately I was able to convince it to oops\\ninstead, and from there it was easier to track down the culprit.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux se ha resuelto la siguiente vulnerabilidad: drm: No desreferenciar el mismo fb muchas veces por error debido al manejo de interbloqueos Si obtenemos un punto muerto despu\u00e9s de la b\u00fasqueda de fb en drm_mode_page_flip_ioctl() procedemos a desreferenciar el fb y luego Vuelva a intentarlo todo desde arriba. Pero nos olvidamos de restablecer el puntero fb a NULL, por lo que si obtenemos otro error durante el reintento, antes de la b\u00fasqueda de fb, procedemos a desref el mismo fb nuevamente sin haber obtenido otra referencia. El resultado final es que el Facebook (eventualmente) terminar\u00e1 siendo liberado mientras todav\u00eda est\u00e1 en uso. Restablezca fb a NULL una vez que lo hayamos eliminado para evitar hacerlo nuevamente hasta que hayamos realizado otra b\u00fasqueda de fb. Esto result\u00f3 ser bastante f\u00e1cil de lograr en un DG2 cuando se realizan volteos as\u00edncronos (y CONFIG_DEBUG_WW_MUTEX_SLOWPATH=y). El primer s\u00edntoma que vi fue que drm_closefb() simplemente se qued\u00f3 atascado en un bucle ocupado mientras recorr\u00eda la lista de framebuffer. Afortunadamente, pude convencerlo de que lo hiciera, y a partir de ah\u00ed fue m\u00e1s f\u00e1cil localizar al 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