cve-2024-26727
Vulnerability from cvelistv5
Published
2024-04-03 14:55
Modified
2024-12-19 08:45
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not ASSERT() if the newly created subvolume already got read [BUG] There is a syzbot crash, triggered by the ASSERT() during subvolume creation: assertion failed: !anon_dev, in fs/btrfs/disk-io.c:1319 ------------[ cut here ]------------ kernel BUG at fs/btrfs/disk-io.c:1319! invalid opcode: 0000 [#1] PREEMPT SMP KASAN RIP: 0010:btrfs_get_root_ref.part.0+0x9aa/0xa60 <TASK> btrfs_get_new_fs_root+0xd3/0xf0 create_subvol+0xd02/0x1650 btrfs_mksubvol+0xe95/0x12b0 __btrfs_ioctl_snap_create+0x2f9/0x4f0 btrfs_ioctl_snap_create+0x16b/0x200 btrfs_ioctl+0x35f0/0x5cf0 __x64_sys_ioctl+0x19d/0x210 do_syscall_64+0x3f/0xe0 entry_SYSCALL_64_after_hwframe+0x63/0x6b ---[ end trace 0000000000000000 ]--- [CAUSE] During create_subvol(), after inserting root item for the newly created subvolume, we would trigger btrfs_get_new_fs_root() to get the btrfs_root of that subvolume. The idea here is, we have preallocated an anonymous device number for the subvolume, thus we can assign it to the new subvolume. But there is really nothing preventing things like backref walk to read the new subvolume. If that happens before we call btrfs_get_new_fs_root(), the subvolume would be read out, with a new anonymous device number assigned already. In that case, we would trigger ASSERT(), as we really expect no one to read out that subvolume (which is not yet accessible from the fs). But things like backref walk is still possible to trigger the read on the subvolume. Thus our assumption on the ASSERT() is not correct in the first place. [FIX] Fix it by removing the ASSERT(), and just free the @anon_dev, reset it to 0, and continue. If the subvolume tree is read out by something else, it should have already get a new anon_dev assigned thus we only need to free the preallocated one.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3f5d47eb163bceb1b9e613c9003bae5fefc0046f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a172344bfdabb46458e03708735d7b1a918c468
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/66b317a2fc45b2ef66527ee3f8fa08fb5beab88d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/833775656d447c545133a744a0ed1e189ce61430
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e03ee2fe873eb68c1f9ba5112fee70303ebf9dfb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e31546b0f34af21738c4ceac47d662c00ee6382f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3f5d47eb163bceb1b9e613c9003bae5fefc0046f
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5a172344bfdabb46458e03708735d7b1a918c468
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/66b317a2fc45b2ef66527ee3f8fa08fb5beab88d
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/833775656d447c545133a744a0ed1e189ce61430
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e03ee2fe873eb68c1f9ba5112fee70303ebf9dfb
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e31546b0f34af21738c4ceac47d662c00ee6382f
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html
Impacted products
Vendor Product Version
Linux Linux Version: 5.9
Show details on NVD website

To clipboard 

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not ASSERT() if the newly created subvolume already got read\n\n[BUG]\nThere is a syzbot crash, triggered by the ASSERT() during subvolume\ncreation:\n\n assertion failed: !anon_dev, in fs/btrfs/disk-io.c:1319\n ------------[ cut here ]------------\n kernel BUG at fs/btrfs/disk-io.c:1319!\n invalid opcode: 0000 [#1] PREEMPT SMP KASAN\n RIP: 0010:btrfs_get_root_ref.part.0+0x9aa/0xa60\n  \u003cTASK\u003e\n  btrfs_get_new_fs_root+0xd3/0xf0\n  create_subvol+0xd02/0x1650\n  btrfs_mksubvol+0xe95/0x12b0\n  __btrfs_ioctl_snap_create+0x2f9/0x4f0\n  btrfs_ioctl_snap_create+0x16b/0x200\n  btrfs_ioctl+0x35f0/0x5cf0\n  __x64_sys_ioctl+0x19d/0x210\n  do_syscall_64+0x3f/0xe0\n  entry_SYSCALL_64_after_hwframe+0x63/0x6b\n ---[ end trace 0000000000000000 ]---\n\n[CAUSE]\nDuring create_subvol(), after inserting root item for the newly created\nsubvolume, we would trigger btrfs_get_new_fs_root() to get the\nbtrfs_root of that subvolume.\n\nThe idea here is, we have preallocated an anonymous device number for\nthe subvolume, thus we can assign it to the new subvolume.\n\nBut there is really nothing preventing things like backref walk to read\nthe new subvolume.\nIf that happens before we call btrfs_get_new_fs_root(), the subvolume\nwould be read out, with a new anonymous device number assigned already.\n\nIn that case, we would trigger ASSERT(), as we really expect no one to\nread out that subvolume (which is not yet accessible from the fs).\nBut things like backref walk is still possible to trigger the read on\nthe subvolume.\n\nThus our assumption on the ASSERT() is not correct in the first place.\n\n[FIX]\nFix it by removing the ASSERT(), and just free the @anon_dev, reset it\nto 0, and continue.\n\nIf the subvolume tree is read out by something else, it should have\nalready get a new anon_dev assigned thus we only need to free the\npreallocated one."
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    "datePublished": "2024-04-03T14:55:25.805Z",
    "dateReserved": "2024-02-19T14:20:24.164Z",
    "dateUpdated": "2024-12-19T08:45:58.338Z",
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La idea aqu\u00ed es que hemos preasignado un n\u00famero de dispositivo an\u00f3nimo para el subvolumen, por lo que podemos asignarlo al nuevo subvolumen. Pero realmente no hay nada que impida que cosas como backref caminen para leer el nuevo subvolumen. Si eso sucede antes de que llamemos a btrfs_get_new_fs_root(), se leer\u00e1 el subvolumen y ya se habr\u00e1 asignado un nuevo n\u00famero de dispositivo an\u00f3nimo. En ese caso, activar\u00edamos ASSERT(), ya que realmente esperamos que nadie lea ese subvolumen (al que a\u00fan no se puede acceder desde fs). Pero a\u00fan es posible realizar cosas como el recorrido de referencia atr\u00e1s para activar la lectura en el subvolumen. Por lo tanto, nuestra suposici\u00f3n sobre ASSERT() no es correcta en primer lugar. [FIX] Arr\u00e9glelo eliminando ASSERT() y simplemente libere @anon_dev, restablezcalo a 0 y contin\u00fae. Si otra cosa lee el \u00e1rbol de subvolumen, ya deber\u00eda tener asignado un nuevo anon_dev, por lo que solo necesitamos liberar el preasignado.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3f5d47eb163bceb1b9e613c9003bae5fefc0046f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a172344bfdabb46458e03708735d7b1a918c468\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/66b317a2fc45b2ef66527ee3f8fa08fb5beab88d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/833775656d447c545133a744a0ed1e189ce61430\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e03ee2fe873eb68c1f9ba5112fee70303ebf9dfb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e31546b0f34af21738c4ceac47d662c00ee6382f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3f5d47eb163bceb1b9e613c9003bae5fefc0046f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/5a172344bfdabb46458e03708735d7b1a918c468\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/66b317a2fc45b2ef66527ee3f8fa08fb5beab88d\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/833775656d447c545133a744a0ed1e189ce61430\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/e03ee2fe873eb68c1f9ba5112fee70303ebf9dfb\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://git.kernel.org/stable/c/e31546b0f34af21738c4ceac47d662c00ee6382f\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"}]}}"
  }
}


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