Files
linux/kernel
Leon Hwang 34746b5a84 bpf: Disallow interpreter fallback for arena-related insns
Since the interpreter does not support the arena-related insns,
interpreter fallback should not be allowed for these insns in
core.c::__bpf_prog_select_runtime().

Currently, when the interpreter executes the arena ST/LDX/STX insns,
it would hit the BUG_ON() in ___bpf_prog_run() at run time.

[    2.579196] BPF interpreter: unknown opcode a2 (imm: 0x0)
[    2.579998] ------------[ cut here ]------------
[    2.580652] kernel BUG at kernel/bpf/core.c:2349!
[    2.581314] Oops: invalid opcode: 0000 [#1] SMP PTI

Set jit_required as true when arena map is used in the prog to disallow
interpreter fallback for arena-related insns.

Fixes: 6082b6c328 ("bpf: Recognize addr_space_cast instruction in the verifier.")
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/bpf/20260715141122.15783-2-leon.hwang@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
2026-07-19 18:26:39 +02:00
..
2026-06-02 15:36:06 +02:00
2025-10-29 10:29:54 +01:00
2026-01-26 19:07:13 -08:00