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CVE-2024-38588

Disclosure Date: June 19, 2024 •
CVE-2024-38588
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Description

In the Linux kernel, the following vulnerability has been resolved:

ftrace: Fix possible use-after-free issue in ftrace_location()

KASAN reports a bug:

BUG: KASAN: use-after-free in ftrace_location+0x90/0x120
Read of size 8 at addr ffff888141d40010 by task insmod/424
CPU: 8 PID: 424 Comm: insmod Tainted: G W 6.9.0-rc2+
[…]
Call Trace:
<TASK>
dump_stack_lvl+0x68/0xa0
print_report+0xcf/0x610
kasan_report+0xb5/0xe0
ftrace_location+0x90/0x120
register_kprobe+0x14b/0xa40
kprobe_init+0x2d/0xff0 [kprobe_example]
do_one_initcall+0x8f/0x2d0
do_init_module+0x13a/0x3c0
load_module+0x3082/0x33d0
init_module_from_file+0xd2/0x130
__x64_sys_finit_module+0x306/0x440
do_syscall_64+0x68/0x140
entry_SYSCALL_64_after_hwframe+0x71/0x79

The root cause is that, in lookup_rec(), ftrace record of some address
is being searched in ftrace pages of some module, but those ftrace pages
at the same time is being freed in ftrace_release_mod() as the
corresponding module is being deleted:

       CPU1                       |      CPU2

register_kprobes() { | delete_module() {

check_kprobe_address_safe() {     |
  arch_check_ftrace_location() {  |
    ftrace_location() {           |
      lookup_rec() // USE!        |   ftrace_release_mod() // Free!

To fix this issue:

  1. Hold rcu lock as accessing ftrace pages in ftrace_location_range();
  2. Use ftrace_location_range() instead of lookup_rec() in
    ftrace_location();
  3. Call synchronize_rcu() before freeing any ftrace pages both in
    ftrace_process_locs()/ftrace_release_mod()/ftrace_free_mem().

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CVSS V3 Severity and Metrics
Base Score:
None
Impact Score:
Unknown
Exploitability Score:
Unknown
Vector:
Unknown
Attack Vector (AV):
Unknown
Attack Complexity (AC):
Unknown
Privileges Required (PR):
Unknown
User Interaction (UI):
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Scope (S):
Unknown
Confidentiality (C):
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Integrity (I):
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Availability (A):
Unknown

General Information

Offensive Application
Unknown
Utility Class
Unknown
Ports
Unknown
OS
Unknown
Vulnerable Versions
Linux 8ea8ef5e4217
Linux not down converted
Prerequisites
Unknown
Discovered By
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PoC Author
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Metasploit Module
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Reporter
Unknown

Vendors

  • Linux

Products

  • Linux
Technical Analysis