漏洞信息
# s390/cpumf：修正cpumf_pmu_event_init()中错误路径上的重复释放问题
N/A
提示
尽管我们采用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。
神龙会尽力确保数据准确，但也请结合实际情况进行甄别与判断。
神龙祝您一切顺利！
漏洞标题
s390/cpumf: Fix double free on error in cpumf_pmu_event_init()
漏洞描述信息
In the Linux kernel, the following vulnerability has been resolved:
s390/cpumf: Fix double free on error in cpumf_pmu_event_init()
In PMU event initialization functions
- cpumsf_pmu_event_init()
- cpumf_pmu_event_init()
- cfdiag_event_init()
the partially created event had to be removed when an error was detected.
The event::event_init() member function had to release all resources
it allocated in case of error. event::destroy() had to be called
on freeing an event after it was successfully created and
event::event_init() returned success.
With
commit c70ca298036c ("perf/core: Simplify the perf_event_alloc() error path")
this is not necessary anymore. The performance subsystem common
code now always calls event::destroy() to clean up the allocated
resources created during event initialization.
Remove the event::destroy() invocation in PMU event initialization
or that function is called twice for each event that runs into an
error condition in event creation.
This is the kernel log entry which shows up without the fix:
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 0 PID: 43388 at lib/refcount.c:87 refcount_dec_not_one+0x74/0x90
CPU: 0 UID: 0 PID: 43388 Comm: perf Not tainted 6.15.0-20250407.rc1.git0.300.fc41.s390x+git #1 NONE
Hardware name: IBM 3931 A01 704 (LPAR)
Krnl PSW : 0704c00180000000 00000209cb2c1b88 (refcount_dec_not_one+0x78/0x90)
R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
Krnl GPRS: 0000020900000027 0000020900000023 0000000000000026 0000018900000000
00000004a2200a00 0000000000000000 0000000000000057 ffffffffffffffea
00000002b386c600 00000002b3f5b3e0 00000209cc51f140 00000209cc7fc550
0000000001449d38 ffffffffffffffff 00000209cb2c1b84 00000189d67dfb80
Krnl Code: 00000209cb2c1b78: c02000506727 larl %r2,00000209cbcce9c6
00000209cb2c1b7e: c0e5ffbd4431 brasl %r14,00000209caa6a3e0
#00000209cb2c1b84: af000000 mc 0,0
>00000209cb2c1b88: a7480001 lhi %r4,1
00000209cb2c1b8c: ebeff0a00004 lmg %r14,%r15,160(%r15)
00000209cb2c1b92: ec243fbf0055 risbg %r2,%r4,63,191,0
00000209cb2c1b98: 07fe bcr 15,%r14
00000209cb2c1b9a: 47000700 bc 0,1792
Call Trace:
[<00000209cb2c1b88>] refcount_dec_not_one+0x78/0x90
[<00000209cb2c1dc4>] refcount_dec_and_mutex_lock+0x24/0x90
[<00000209caa3c29e>] hw_perf_event_destroy+0x2e/0x80
[<00000209cacaf8b4>] __free_event+0x74/0x270
[<00000209cacb47c4>] perf_event_alloc.part.0+0x4a4/0x730
[<00000209cacbf3e8>] __do_sys_perf_event_open+0x248/0xc20
[<00000209cacc14a4>] __s390x_sys_perf_event_open+0x44/0x50
[<00000209cb8114de>] __do_syscall+0x12e/0x260
[<00000209cb81ce34>] system_call+0x74/0x98
Last Breaking-Event-Address:
[<00000209caa6a4d2>] __warn_printk+0xf2/0x100
---[ end trace 0000000000000000 ]---
CVSS信息
N/A
漏洞类别
N/A
漏洞标题
Linux kernel 安全漏洞
漏洞描述信息
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于s390/cpumf中cpumf_pmu_event_init函数存在双重释放问题。
CVSS信息
N/A
漏洞类别
其他
