cve-2024-36966
Vulnerability from cvelistv5
Published
2024-06-08 12:52
Modified
2024-12-19 09:03
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: erofs: reliably distinguish block based and fscache mode When erofs_kill_sb() is called in block dev based mode, s_bdev may not have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache mode, and then attempt to free an anon_dev that has never been allocated, triggering the following warning: ============================================ ida_free called for id=0 which is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace: <TASK> erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ============================================ Now when erofs_kill_sb() is called, erofs_sb_info must have been initialised, so use sbi->fsid to distinguish between the two modes.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371
Impacted products
Vendor Product Version
Linux Linux Version: 6.6
Show details on NVD website

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    "nvd": "{\"cve\":{\"id\":\"CVE-2024-36966\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-06-08T13:15:57.917\",\"lastModified\":\"2024-11-21T09:22:55.750\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nerofs: reliably distinguish block based and fscache mode\\n\\nWhen erofs_kill_sb() is called in block dev based mode, s_bdev may not\\nhave been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled,\\nit will be mistaken for fscache mode, and then attempt to free an anon_dev\\nthat has never been allocated, triggering the following warning:\\n\\n============================================\\nida_free called for id=0 which is not allocated.\\nWARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140\\nModules linked in:\\nCPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630\\nRIP: 0010:ida_free+0x134/0x140\\nCall Trace:\\n \u003cTASK\u003e\\n erofs_kill_sb+0x81/0x90\\n deactivate_locked_super+0x35/0x80\\n get_tree_bdev+0x136/0x1e0\\n vfs_get_tree+0x2c/0xf0\\n do_new_mount+0x190/0x2f0\\n [...]\\n============================================\\n\\nNow when erofs_kill_sb() is called, erofs_sb_info must have been\\ninitialised, so use sbi-\u003efsid to distinguish between the two modes.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: erofs: distingue de manera confiable el modo basado en bloques y el modo fscache cuando se llama a erofs_kill_sb() en el modo basado en desarrollo de bloques, es posible que s_bdev a\u00fan no se haya inicializado y, si CONFIG_EROFS_FS_ONDEMAND est\u00e1 habilitado, se confundido con el modo fscache y luego intenta liberar un anon_dev que nunca ha sido asignado, lo que genera la siguiente advertencia: ============================= ================= ida_free solicit\u00f3 id=0 que no est\u00e1 asignado. ADVERTENCIA: CPU: 14 PID: 926 en lib/idr.c:525 ida_free+0x134/0x140 M\u00f3dulos vinculados en: CPU: 14 PID: 926 Comm: mount No contaminado 6.9.0-rc3-dirty #630 RIP: 0010:ida_free +0x134/0x140 Seguimiento de llamadas:  erofs_kill_sb+0x81/0x90 desactivar_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ========== ================================== Ahora, cuando se llama a erofs_kill_sb(), erofs_sb_info debe haberse inicializado, as\u00ed que use sbi-\u0026gt;fsid para distinguir entre los dos modos.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
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