漏洞信息
# net_sched: skbprio:删除过于严格的队列断言
## 漏洞概述
Linux内核中的`net_sched: skbprio`模块存在一个漏洞,该漏洞导致在特定条件下的队列断言失败。
## 影响版本
未指定具体影响的版本。
## 细节
在当前实现中,当SKBPRIO作为带令牌桶过滤器(TBF)的子调度器使用且带有特定参数时,其入队/出队操作中的一个断言会在某些条件下失败。具体来说,TBF在没有足够令牌情况下会对子调度器中的包进行预览但不会实际将其从队列中移除。这种预览操作造成了父调度器和子调度器之间的队列长度计数器不一致。当TBF后来接收到一个高优先级的数据包时,SKBPRIO的队列长度显示值与其实内部优先级队列跟踪中的值可能不同,从而触发了断言。
修正方案移除了这个过于严格的断言,因为这些断言其实是不必要的。
## 影响
该漏洞可能导致系统在处理网络数据包时出现异常行为,具体表现为内核模块的不一致状态和潜在的断言失败。
备注
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漏洞标题
net_sched: skbprio: Remove overly strict queue assertions
漏洞描述信息
In the Linux kernel, the following vulnerability has been resolved:
net_sched: skbprio: Remove overly strict queue assertions
In the current implementation, skbprio enqueue/dequeue contains an assertion
that fails under certain conditions when SKBPRIO is used as a child qdisc under
TBF with specific parameters. The failure occurs because TBF sometimes peeks at
packets in the child qdisc without actually dequeuing them when tokens are
unavailable.
This peek operation creates a discrepancy between the parent and child qdisc
queue length counters. When TBF later receives a high-priority packet,
SKBPRIO's queue length may show a different value than what's reflected in its
internal priority queue tracking, triggering the assertion.
The fix removes this overly strict assertions in SKBPRIO, they are not
necessary at all.
CVSS信息
N/A
漏洞类别
N/A