[PATCH bpf-next v10 5/5] bpf, arm64: Emit BTI for indirect jump target

[Leon Hwang]

On 24/3/26 20:20, Xu Kuohai wrote:
> From: Xu Kuohai <xukuohai at huawei.com>
> 
> On CPUs that support BTI, the indirect jump selftest triggers a kernel
> panic because there is no BTI instructions at the indirect jump targets.
> 
> Fix it by emitting a BTI instruction for each indirect jump target.
> 
> For reference, below is a sample panic log.
> 
> Internal error: Oops - BTI: 0000000036000003 [#1]  SMP
> ...
> Call trace:
>  bpf_prog_2e5f1c71c13ac3e0_big_jump_table+0x54/0xf8 (P)
>  bpf_prog_run_pin_on_cpu+0x140/0x468
>  bpf_prog_test_run_syscall+0x280/0x3b8
>  bpf_prog_test_run+0x22c/0x2c0
> 
> Fixes: f4a66cf1cb14 ("bpf: arm64: Add support for indirect jumps")
> Reviewed-by: Anton Protopopov <a.s.protopopov at gmail.com>
> Signed-off-by: Xu Kuohai <xukuohai at huawei.com>

Acked-by: Leon Hwang <leon.hwang at linux.dev>

> ---

[...]