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From: Johan Almbladh <johan.almbladh@anyfinetworks.com>
To: Yonghong Song <yhs@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Andrii Nakryiko <andrii@kernel.org>,
	Martin KaFai Lau <kafai@fb.com>, Song Liu <songliubraving@fb.com>,
	John Fastabend <john.fastabend@gmail.com>,
	KP Singh <kpsingh@kernel.org>,
	Tony Ambardar <Tony.Ambardar@gmail.com>,
	Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH] bpf: Fix off-by-one in tail call count limiting
Date: Thu, 29 Jul 2021 23:37:51 +0200	[thread overview]
Message-ID: <CAM1=_QTQeTp7LF-XdrOG_qjKpPJ-oQ24kKnG_7MDSbA7LX+uoA@mail.gmail.com> (raw)
In-Reply-To: <1503e9c4-7150-3244-4710-7b6b2d59e0da@fb.com>

On Wed, Jul 28, 2021 at 9:13 PM Yonghong Song <yhs@fb.com> wrote:
> I also checked arm/arm64 jit. I saw the following comments:
>
>          /* if (tail_call_cnt > MAX_TAIL_CALL_CNT)
>           *      goto out;
>           * tail_call_cnt++;
>           */
>
> Maybe we have this MAX_TAIL_CALL_CNT + 1 issue
> for arm/arm64 jit?

That wouldn't be unreasonable. I don't have an arm or arm64 setup
available right now, but I can try to test it in qemu.

  reply	other threads:[~2021-07-29 21:38 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-26  8:17 [RFC PATCH 00/14] bpf/tests: Extend the eBPF test suite Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 01/14] bpf/tests: add BPF_JMP32 test cases Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 02/14] bpf/tests: add BPF_MOV tests for zero and sign extension Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 03/14] bpf/tests: fix typos in test case descriptions Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 04/14] bpf/tests: add more tests of ALU32 and ALU64 bitwise operations Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 05/14] bpf/tests: add more ALU32 tests for BPF_LSH/RSH/ARSH Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 06/14] bpf/tests: add more BPF_LSH/RSH/ARSH tests for ALU64 Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 07/14] bpf/tests: add more ALU64 BPF_MUL tests Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 08/14] bpf/tests: add tests for ALU operations implemented with function calls Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 09/14] bpf/tests: add word-order tests for load/store of double words Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 10/14] bpf/tests: add branch conversion JIT test Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 11/14] bpf/tests: add test for 32-bit context pointer argument passing Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 12/14] bpf/tests: add tests for atomic operations Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 13/14] bpf/tests: add tests for BPF_CMPXCHG Johan Almbladh
2021-07-26  8:17 ` [RFC PATCH 14/14] bpf/tests: add tail call test suite Johan Almbladh
2021-07-26 22:53 ` [RFC PATCH 00/14] bpf/tests: Extend the eBPF " Andrii Nakryiko
2021-07-28  8:27   ` Daniel Borkmann
2021-07-28 12:15     ` Johan Almbladh
2021-07-28 16:47     ` [PATCH] bpf: Fix off-by-one in tail call count limiting Johan Almbladh
2021-07-28 19:13       ` Yonghong Song
2021-07-29 21:37         ` Johan Almbladh [this message]
2021-07-29 22:29           ` Andrii Nakryiko
2021-07-29 22:48             ` Andrii Nakryiko
2021-08-01  8:37               ` Johan Almbladh
2021-08-02 20:28                 ` Andrii Nakryiko
2021-08-05 14:37                   ` Johan Almbladh
2021-08-05 22:54                     ` Andrii Nakryiko

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