该帮助函数要求 5.13 及以上的内核才支持(BPF Features by Linux Kernel Version)。 该帮助函数的目标场景之一就是防火墙。 该帮助函数的函数签名及使用说明如下: /** bpf_for_each_map_elem** For each element in **map**, call **callback_fn** function with* **map**, **callback_ctx** and oth...
This chapter provides the complete list of Berkeley Packet Filter (BPF) features available in the kernel of this minor version of Red Hat Enterprise Linux 9. The tables include the lists of: System configuration and other options Available program types and supported helpers Available map...
分析的代码为linux-4.20-rc3版本:https://elixir.bootlin.com/linux/v4.20-rc3/source。因为该漏洞影响Linux Kernel 4.20rc1-4.20rc4,主要Linux发行版并不受其影响。 一、简介 BPF的全称是Berkeley Packet Filter,字面意思意味着它是从包过滤而来,该模块主要就是用于用户态定义数据包过滤方法;从本质上我们可以把它看...
*/ if (type == BPF_PROG_TYPE_KPROBE && attr->kern_version != LINUX_VERSION_CODE) return -EINVAL; /* (1.5) 对BPF_PROG_TYPE_SOCKET_FILTER和BPF_PROG_TYPE_CGROUP_SKB以外的BPF程序加载,需要管理员权限 */ if (type != BPF_PROG_TYPE_SOCKET_FILTER && type != BPF_PROG_TYPE_CGROUP_SKB &&...
Linux bpf 1.1、BPF内核实现 BPF的字面上意思Berkeley Packet Filter意味着它是从包过滤而来。如果在开始前对BPF缺乏感性的认识建议先看一下参考文档:“3.1、Berkeley Packet Filter (BPF) (Kernel Document)”、“3.2、BPF and XDP Reference Guide”。
/sys/kernel/btf/vmlinux 存在,可以用 cat 读出。但bpftool 显示以下错误:$ sudo bpftool btf dump file /sys/kernel/btf/vmlinux format c libbpf: failed to get EHDR from /sys/kernel/btf/vmlinux Error: failed to load BTF from /sys/kernel/btf/vmlinux: Unknown error -4001 ...
Operating System: Rocky Linux 9.3 (Blue Onyx) CPE OS Name: cpe:/o:rocky:rocky:9::baseos Kernel: Linux 5.14.0-362.8.1.el9_3.x86_64 Architecture: x86-64 Hardware Vendor: VMware, Inc. Hardware Model: VMware Virtual Platform Firmware Version: 6.00 ...
Running BPF programs amounts to having a user program make BPF system calls which are checked for appropriate privileges and verified to execute within limits. For example, in the Linux kernel version 5.4.44, the BPF system call checks for privilege with: ...
Recently, it was discovered that bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. De4dCr0w of 360 Alpha Lab discovered that this vulnerability could be turned into out-of-bounds ...
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