bpf: Disallow interpreter fallback for gotox insn

Browse source

The interpreter does not recognize the BPF_JMP|BPF_JA|BPF_X insn, which
is used for insn_array map. Thereafter, it would hit the BUG_ON() in
___bpf_prog_run() at run time.

[    2.563726] BPF interpreter: unknown opcode 0d (imm: 0x0)
[    2.564557] ------------[ cut here ]------------
[    2.565206] kernel BUG at kernel/bpf/core.c:2349!
[    2.565882] Oops: invalid opcode: 0000 [#1] SMP PTI

Set jit_required as true when insn_array map is used in the prog in
order to disallow interpreter fallback for gotox insn in
core.c::__bpf_prog_select_runtime().

Fixes: 493d9e0d60 ("bpf, x86: add support for indirect jumps")
Signed-off-by: Leon Hwang <leon.hwang@linux.dev>
Link: https://lore.kernel.org/bpf/20260715141122.15783-3-leon.hwang@linux.dev
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

...

This commit is contained in:

Leon Hwang 2026-07-15 22:11:21 +08:00 • committed by Kumar Kartikeya Dwivedi

parent 34746b5a84

commit 905f716362

No known key found for this signature in database

GPG key ID: 472D377B63542F83

1 changed files with 1 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

1

kernel/bpf/verifier.c

View file