Bug 2322303 (CVE-2024-50077) - CVE-2024-50077 kernel: Bluetooth: ISO: Fix multiple init when debugfs is disabled
Summary: CVE-2024-50077 kernel: Bluetooth: ISO: Fix multiple init when debugfs is disa...
Keywords:
Status: NEW
Alias: CVE-2024-50077
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On: 2322363
Blocks:
TreeView+ depends on / blocked
 
Reported: 2024-10-29 01:01 UTC by OSIDB Bzimport
Modified: 2024-10-29 07:55 UTC (History)
4 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2024-10-29 01:01:14 UTC
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: Fix multiple init when debugfs is disabled

If bt_debugfs is not created successfully, which happens if either
CONFIG_DEBUG_FS or CONFIG_DEBUG_FS_ALLOW_ALL is unset, then iso_init()
returns early and does not set iso_inited to true. This means that a
subsequent call to iso_init() will result in duplicate calls to
proto_register(), bt_sock_register(), etc.

With CONFIG_LIST_HARDENED and CONFIG_BUG_ON_DATA_CORRUPTION enabled, the
duplicate call to proto_register() triggers this BUG():

  list_add double add: new=ffffffffc0b280d0, prev=ffffffffbab56250,
    next=ffffffffc0b280d0.
  ------------[ cut here ]------------
  kernel BUG at lib/list_debug.c:35!
  Oops: invalid opcode: 0000 [#1] PREEMPT SMP PTI
  CPU: 2 PID: 887 Comm: bluetoothd Not tainted 6.10.11-1-ao-desktop #1
  RIP: 0010:__list_add_valid_or_report+0x9a/0xa0
  ...
    __list_add_valid_or_report+0x9a/0xa0
    proto_register+0x2b5/0x340
    iso_init+0x23/0x150 [bluetooth]
    set_iso_socket_func+0x68/0x1b0 [bluetooth]
    kmem_cache_free+0x308/0x330
    hci_sock_sendmsg+0x990/0x9e0 [bluetooth]
    __sock_sendmsg+0x7b/0x80
    sock_write_iter+0x9a/0x110
    do_iter_readv_writev+0x11d/0x220
    vfs_writev+0x180/0x3e0
    do_writev+0xca/0x100
  ...

This change removes the early return. The check for iso_debugfs being
NULL was unnecessary, it is always NULL when iso_inited is false.


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