bpf:检查 bpf_iter_bits_new() 中 nr_words 的有效性(CVE-2024-50253)
CVE编号
CVE-2024-50253利用情况
暂无补丁情况
N/A披露时间
2024-11-09漏洞描述
In the Linux kernel, the following vulnerability has been resolved: bpf: Check the validity of nr_words in bpf_iter_bits_new() Check the validity of nr_words in bpf_iter_bits_new(). Without this check, when multiplication overflow occurs for nr_bits (e.g., when nr_words = 0x0400-0001, nr_bits becomes 64), stack corruption may occur due to bpf_probe_read_kernel_common(..., nr_bytes = 0x2000-0008). Fix it by limiting the maximum value of nr_words to 511. The value is derived from the current implementation of BPF memory allocator. To ensure compatibility if the BPF memory allocator's size limitation changes in the future, use the helper bpf_mem_alloc_check_size() to check whether nr_bytes is too larger. And return -E2BIG instead of -ENOMEM for oversized nr_bytes.解决建议
建议您更新当前系统或软件至最新版,完成漏洞的修复。
参考链接 |
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https://git.kernel.org/stable/c/393397fbdcad7396639d7077c33f86169184ba99 | |
https://git.kernel.org/stable/c/c9539e09c67880ecd88b51188c346a2cc078b06c |
受影响软件情况
# | 类型 | 厂商 | 产品 | 版本 | 影响面 | ||||
1 | |||||||||
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运行在以下环境 | |||||||||
系统 | debian_11 | linux | * | Up to (excluding) 5.10.226-1 | |||||
运行在以下环境 | |||||||||
系统 | debian_12 | linux | * | Up to (excluding) 6.1.115-1 |
- 攻击路径 N/A
- 攻击复杂度 N/A
- 权限要求 N/A
- 影响范围 N/A
- 用户交互 N/A
- 可用性 N/A
- 保密性 N/A
- 完整性 N/A
CWE-ID | 漏洞类型 |
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