It is also useful as a caniuse.com but for Linux kernel.
For example, I got surprised that sleepable fentry #BPF program depends on `CONFIG_FUNCTION_ERROR_INJECTION` sometime ago. It is enabled by default on Arch Linux which is my development environment. But it is disabled in other distros like fedora.
So this website is useful for checking if the kernel feature you want to use is enabled by the distros you want to support.
2/3
BPF support in GCC 16 and beyond
I quite like Project Zero blog. Some interesting tricks.
"memstart_addr is an exported variable that can be looked up in /proc/kallsyms."
⚠️ Their content was like that long before chat-supplychain-pt, I understand almost nothing of it 🤯
A KASLR leak is a type of security weakness where information is unintentionally revealed that lets someone figure out the randomized memory location of the OS kernel.
Defeating KASLR by Doing Nothing at All
https://projectzero.google/2025/11/defeating-kaslr-by-doing-nothing-at-all.html
[$] Representing the true signatures of kernel functions
Optimizing compilers can, under some circumstances, infer when a parameter to a function is not needed, and remove it. This is all well and good until the kernel's tracing or BPF s [...]
https://lwn.net/Articles/1073762/ #LWN #Linux #kernel #GCC #Clang #Rust #BPF #LSFMMBPF
[$] Further progress toward removing the page map count
The mapcount field was created to track the number of mappings (page-table entries) that refer to the given page. Among other things, a mapcount of zero means that the page has no [...]
kxxt
LWN.net
Lobsters
Nicolas MØUART