2021-04-15 16:37 UTC+0200 ~ Daniel Borkmann [off-list ref]

On 4/15/21 11:32 AM, Jianlin Lv wrote:

quoted

For debugging JITs, dumping the JITed image to kernel log is discouraged,
"bpftool prog dump jited" is much better way to examine JITed dumps.
This patch get rid of the code related to bpf_jit_enable=2 mode and
update the proc handler of bpf_jit_enable, also added auxiliary
information to explain how to use bpf_jit_disasm tool after this change.

Signed-off-by: Jianlin Lv <redacted>

Hello,

For what it's worth, I have already seen people dump the JIT image in
kernel logs in Qemu VMs running with just a busybox, not for kernel
development, but in a context where buiding/using bpftool was not
possible. Maybe not a common case, but still, removing the debugging
mode will make that impossible. Is there a particular incentive to
remove the feature?

Best regards,
Quentin