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Questions - bpf

why bpf program doesn't find info? choose wrong kfunc?

I use kprobe/do_sys_open to observe something. I write a demo to open a file and read. I think when I execute this demo, bpf program can find these action, but from bpf_trace_printk, I can't find any ...
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Muqali He

c

linux

bpf

Votes: 0

Answers: 1

Latest Answer

The actual syscall involved in your demo is probably openat(), I'd try hooking on kprobe/do_sys_openat2 instead of kprobe/do_sys_open. See how opensnoop in BCC, for example, hooks to both open and ope...
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Qeole

Unable to fetch data using bpf_map_lookup_elem()

I am trying to write a code for XDP where a user space program will populate a bpf map and then later the Kernel will look into the map. For creating the map I have added a SEC(".maps") in t...
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Rishab

ebpf

bpf

xdp-bpf

xdp-ebpf

libbpf

Votes: 0

Answers: 1

Latest Answer

Actually, I found the issue. I had to change my key definition from: struct Key { uint32_t srcIP; uint16_t srcPort; }; to: struct Key { uint32_t IP; uint32_t port; }; This has someth...
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Rishab

BPF / XDP: 'bpftool batch file' returns 'Error: reading batch file failed: Operation not permitted'

I have a docker container with an XDP program loaded on it. I also have a batch file for the bpftool to run. When I run bpftool batch file tmp_bpftool.txt, I get Error: reading batch file failed: Oper...
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Ferrar

ebpf

bpf

xdp-bpf

Votes: 0

Answers: 1

Latest Answer

TL;DR: Your map update works fine. The message is a bug in bpftool. Bpftool updates the maps just as you would expect; and then, after processing all the batch file, it checks errno. If errno is 0, it...
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Qeole

Why is "anchor build" and "Cargo build-bpf" showing wrong rustc version?

I'm trying to build the (https://github.com/betterclever/solend-anchor) package using anchor build, however I get the following error error: package `uint v0.9.3` cannot be built because it requires r...
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Highness

rust

rust-cargo

solana

bpf

anchor-solana

Votes: 0

Answers: 2

Latest Answer

I have Solana latest version, I faced the same error while compiling one of the downloaded program. Command solana-install update Worked for me.
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Abdul Manan

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