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CVE PROGRAM SOURCE RECORD5.5 Medium

CVE-2022-49450

rxrpc: Fix listen() setting the bar too high for the prealloc rings

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix listen() setting the bar too high for the prealloc rings AF_RXRPC's listen() handler lets you set the backlog up to 32 (if you bump up the sysctl), but whilst the preallocation circular buffers have 32 slots in them, one of them has to be a dead slot because we're using CIRC_CNT(). This means that listen(rxrpc_sock, 32) will cause an oops when the socket is closed because rxrpc_service_prealloc_one() allocated one too many calls and rxrpc_discard_prealloc() won't then be able to get rid of them because it'll think the ring is empty. rxrpc_release_calls_on_socket() then tries to abort them, but oopses because call->peer isn't yet set. Fix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match the ring capacity. BUG: kernel NULL pointer dereference, address: 0000000000000086 ... RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc] Call Trace: <TASK> ? __wake_up_common_lock+0x7a/0x90 ? rxrpc_notify_socket+0x8e/0x140 [rxrpc] ? rxrpc_abort_call+0x4c/0x60 [rxrpc] rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc] rxrpc_release+0xc9/0x1c0 [rxrpc] __sock_release+0x37/0xa0 sock_close+0x11/0x20 __fput+0x89/0x240 task_work_run+0x59/0x90 do_exit+0x319/0xaa0

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < 61fb38cfbb1d54d3dafd0c25752f684b3cd00b32affected
  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < 616f76498d5ddf26b997caf64a95cda3c8a55533affected
  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < 4a3a78b7918bdd723d8c7c9786522ca969bffcc4affected
  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < 91b34bf0409f43bb60453bab23c5beadd726d022affected
  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < 5b4826657d36c218e9f08e8d3223b0edce3de88faffected
  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < b3a9b227d5e7467b8518160ff034ea22bb9de573affected
  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < 369de57492c4f1a42563c5a3bd365822ca3bfc79affected
  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < e198f1930050e3115c80b67d9249f80f98a27c67affected
  • 00e907127e6f86d0f9b122d9b4347a8aa09a8b61 to < 88e22159750b0d55793302eeed8ee603f5c1a95caffected

Linux Linux

Default version status: affected

  • 4.9affected
  • 0 to < 4.9unaffected
  • 4.9.318 to ≤ 4.9.*unaffected
  • 4.14.283 to ≤ 4.14.*unaffected
  • 4.19.247 to ≤ 4.19.*unaffected
  • 5.4.198 to ≤ 5.4.*unaffected
  • 5.10.121 to ≤ 5.10.*unaffected
  • 5.15.46 to ≤ 5.15.*unaffected
  • 5.17.14 to ≤ 5.17.*unaffected
  • 5.18.3 to ≤ 5.18.*unaffected
  • 5.19 to ≤ *unaffected

References