do_show--->show_proc--->bpf_task_fd_query--->sys_bpf(BPF_TASK_FD_QUERY, &attr, sizeof(attr)); 从代码流程可得到bpftool perf可现实的类型有: raw_tracepoint, tracepoint, kprobe, kretprobe, uprobe, uretprobe 显示的信息方法为遍历/proc目录下的每个pid,然后系统调用sys_bpf查询该pid是否为我...
将BPF附加到kprobe失败EN作者 | 许庆伟 策划 | 凌敏 随着 eBPF 技术在各种行业领域上的使用和普及...
@@ -461,6 +461,7 @@ config KERNEL_BPF_EVENTS config KERNEL_BPF_KPROBE_OVERRIDE bool depends on KERNEL_KPROBES default n config KERNEL_AIO bool "Compile the kernel with asynchronous IO support" 0 comments on commit 4448b27 Please sign in to comment. Footer...
linux Kprobe BPF程序执行顺序由于kprobe程序的执行顺序在不同的内核版本中可能会有所不同，因此不可能保...
root@localhost:/bpfonandroid# zcat /proc/config.gz | grep -E "CONFIG_FUNCTION_ERROR_INJECTION|KPROBE_OVERRIDE" CONFIG_BPF_KPROBE_OVERRIDE=y CONFIG_FUNCTION_ERROR_INJECTION=y And I checked if openat hasALLOW_ERROR_INJECTION root@localhost:/bpfonandroid# cat /proc/kallsyms | grep _eil_addr |...
> +static DEFINE_PER_CPU(struct pt_regs, bpf_kprobe_multi_pt_regs); this is a waste if CONFIG_HAVE_PT_REGS_TO_FTRACE_REGS_CAST=y, right? Can we guard it? > + > static int copy_user_syms(struct user_syms *us, unsigned long __user *usyms, ...
struct bpf_kprobe_multi_run_ctx run_ctx = { .link = link, .entry_ip = entry_ip, }; struct bpf_run_ctx *old_run_ctx; + struct pt_regs *regs; int err; if (unlikely(__this_cpu_inc_return(bpf_prog_active) != 1)) {
汇总一下内核调试的几种 trace 工具(底层主要依赖 kprobe 和 ftrace):systemtap(链接)bpftrace(链接)bcc-tools(链接)bpf-perf-tools-book(链接)perf-tools(链接) 发布于 2023-01-13 12:00・IP 属地四川 赞同22 分享收藏 写下你的评论... 1 条评论 默认 最新 prettykernel mark 2023-...
Wire through bpf_cookie for all attach APIs that use perf_event_open under the hood: - for kprobes, extend existing bpf_kprobe_opts with bpf_cookie field; - for perf_event, uprobe, and tracepoint APIs, add their _opts variants and pass bpf_cookie through opts. For kernel that don't ...
I'm on Ubuntu 5.15.0-100-generic built using the instructions for Ubuntu I run: /sbin/offcputime-bpfcc 3 warnings generated. cannot attach kprobe, probe entry may not exist Traceback (most recent call last): File "/sbin/offcputime-bpfcc"...