From: Leon Hwang <leon.hwang@linux.dev>
To: Xu Kuohai <xukuohai@huaweicloud.com>,
bpf@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: "Alexei Starovoitov" <ast@kernel.org>,
"Daniel Borkmann" <daniel@iogearbox.net>,
"Andrii Nakryiko" <andrii@kernel.org>,
"Martin KaFai Lau" <martin.lau@linux.dev>,
"Eduard Zingerman" <eddyz87@gmail.com>,
"Yonghong Song" <yonghong.song@linux.dev>,
"Puranjay Mohan" <puranjay@kernel.org>,
"Anton Protopopov" <a.s.protopopov@gmail.com>,
"Alexis Lothoré" <alexis.lothore@bootlin.com>,
"Shahab Vahedi" <list+bpf@vahedi.org>,
"Russell King" <linux@armlinux.org.uk>,
"Tiezhu Yang" <yangtiezhu@loongson.cn>,
"Hengqi Chen" <hengqi.chen@gmail.com>,
"Johan Almbladh" <johan.almbladh@anyfinetworks.com>,
"Paul Burton" <paulburton@kernel.org>,
"Hari Bathini" <hbathini@linux.ibm.com>,
"Christophe Leroy" <chleroy@kernel.org>,
"Naveen N Rao" <naveen@kernel.org>,
"Luke Nelson" <luke.r.nels@gmail.com>,
"Xi Wang" <xi.wang@gmail.com>, "Björn Töpel" <bjorn@kernel.org>,
"Pu Lehui" <pulehui@huawei.com>,
"Ilya Leoshkevich" <iii@linux.ibm.com>,
"Heiko Carstens" <hca@linux.ibm.com>,
"Vasily Gorbik" <gor@linux.ibm.com>,
"David S . Miller" <davem@davemloft.net>,
"Wang YanQing" <udknight@gmail.com>
Subject: Re: [PATCH bpf-next v10 5/5] bpf, arm64: Emit BTI for indirect jump target
Date: Wed, 25 Mar 2026 18:14:52 +0800 [thread overview]
Message-ID: <c92395a7-5b56-415b-afe7-186b69c0a5e1@linux.dev> (raw)
In-Reply-To: <20260324122052.342751-6-xukuohai@huaweicloud.com>
On 24/3/26 20:20, Xu Kuohai wrote:
> From: Xu Kuohai <xukuohai@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@gmail.com>
> Signed-off-by: Xu Kuohai <xukuohai@huawei.com>
Acked-by: Leon Hwang <leon.hwang@linux.dev>
> ---
[...]
prev parent reply other threads:[~2026-03-25 10:15 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-24 12:20 [PATCH bpf-next v10 0/5] emit ENDBR/BTI instructions for indirect jump targets Xu Kuohai
2026-03-24 12:20 ` [PATCH bpf-next v10 1/5] bpf: Move constants blinding out of arch-specific JITs Xu Kuohai
2026-03-24 12:46 ` bot+bpf-ci
2026-03-25 7:47 ` Xu Kuohai
2026-03-25 15:12 ` Alexei Starovoitov
2026-03-24 12:20 ` [PATCH bpf-next v10 2/5] bpf: Pass bpf_verifier_env to JIT Xu Kuohai
2026-03-24 12:20 ` [PATCH bpf-next v10 3/5] bpf: Add helper to detect indirect jump targets Xu Kuohai
2026-03-24 12:20 ` [PATCH bpf-next v10 4/5] bpf, x86: Emit ENDBR for " Xu Kuohai
2026-03-25 10:13 ` Leon Hwang
2026-03-24 12:20 ` [PATCH bpf-next v10 5/5] bpf, arm64: Emit BTI for indirect jump target Xu Kuohai
2026-03-25 10:14 ` Leon Hwang [this message]
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