From: David Vernet <void@manifault.com>
To: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@kernel.org>,
Joanne Koong <joannelkoong@gmail.com>
Subject: Re: [PATCH bpf-next v1 09/13] selftests/bpf: Add test for dynptr reinit in user_ringbuf callback
Date: Wed, 19 Oct 2022 11:59:49 -0500 [thread overview]
Message-ID: <Y1AtBSPjy2Sp/C9b@maniforge.dhcp.thefacebook.com> (raw)
In-Reply-To: <20221018135920.726360-10-memxor@gmail.com>
On Tue, Oct 18, 2022 at 07:29:16PM +0530, Kumar Kartikeya Dwivedi wrote:
> The original support for bpf_user_ringbuf_drain callbacks simply
> short-circuited checks for the dynptr state, allowing users to pass
> PTR_TO_DYNPTR (now CONST_PTR_TO_DYNPTR) to helpers that initialize a
> dynptr. This bug would have also surfaced with other dynptr helpers in
> the future that changed dynptr view or modified it in some way.
>
> Include test cases for all cases, i.e. both bpf_dynptr_from_mem and
> bpf_ringbuf_reserve_dynptr, and ensure verifier rejects both of them.
> Without the fix, both of these programs load and pass verification.
>
> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
> ---
LGTM
Acked-by: David Vernet <void@manifault.com>
next prev parent reply other threads:[~2022-10-19 17:00 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-18 13:59 [PATCH bpf-next v1 00/13] Fixes for dynptr Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 01/13] bpf: Refactor ARG_PTR_TO_DYNPTR checks into process_dynptr_func Kumar Kartikeya Dwivedi
2022-10-18 19:45 ` David Vernet
2022-10-19 6:04 ` Kumar Kartikeya Dwivedi
2022-10-19 15:26 ` David Vernet
2022-10-19 22:59 ` Joanne Koong
2022-10-20 0:55 ` Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 02/13] bpf: Rework process_dynptr_func Kumar Kartikeya Dwivedi
2022-10-18 23:16 ` David Vernet
2022-10-19 6:18 ` Kumar Kartikeya Dwivedi
2022-10-19 16:05 ` David Vernet
2022-10-20 1:09 ` Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 03/13] bpf: Rename confusingly named RET_PTR_TO_ALLOC_MEM Kumar Kartikeya Dwivedi
2022-10-18 21:38 ` sdf
2022-10-19 6:19 ` Kumar Kartikeya Dwivedi
2022-11-07 22:35 ` Joanne Koong
2022-11-07 23:12 ` Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 04/13] bpf: Rework check_func_arg_reg_off Kumar Kartikeya Dwivedi
2022-10-18 21:55 ` sdf
2022-10-19 6:24 ` Kumar Kartikeya Dwivedi
2022-11-07 23:17 ` Joanne Koong
2022-11-08 18:22 ` Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 05/13] bpf: Fix state pruning for STACK_DYNPTR stack slots Kumar Kartikeya Dwivedi
2022-11-08 20:22 ` Joanne Koong
2022-11-09 18:39 ` Kumar Kartikeya Dwivedi
2022-11-10 0:41 ` Joanne Koong
2022-10-18 13:59 ` [PATCH bpf-next v1 06/13] bpf: Fix missing var_off check for ARG_PTR_TO_DYNPTR Kumar Kartikeya Dwivedi
2022-10-19 18:52 ` Alexei Starovoitov
2022-10-20 1:04 ` Kumar Kartikeya Dwivedi
2022-10-20 2:13 ` Alexei Starovoitov
2022-10-20 2:40 ` Kumar Kartikeya Dwivedi
2022-10-20 2:56 ` Alexei Starovoitov
2022-10-20 3:23 ` Kumar Kartikeya Dwivedi
2022-10-21 0:46 ` Alexei Starovoitov
2022-10-21 1:53 ` Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 07/13] bpf: Fix partial dynptr stack slot reads/writes Kumar Kartikeya Dwivedi
2022-10-21 22:50 ` Joanne Koong
2022-10-21 22:57 ` Joanne Koong
2022-10-22 4:08 ` Kumar Kartikeya Dwivedi
2022-11-03 14:07 ` Joanne Koong
2022-11-04 22:14 ` Andrii Nakryiko
2022-11-04 23:02 ` Kumar Kartikeya Dwivedi
2022-11-04 23:08 ` Andrii Nakryiko
2022-10-18 13:59 ` [PATCH bpf-next v1 08/13] bpf: Use memmove for bpf_dynptr_{read,write} Kumar Kartikeya Dwivedi
2022-10-21 18:12 ` Joanne Koong
2022-10-18 13:59 ` [PATCH bpf-next v1 09/13] selftests/bpf: Add test for dynptr reinit in user_ringbuf callback Kumar Kartikeya Dwivedi
2022-10-19 16:59 ` David Vernet [this message]
2022-10-18 13:59 ` [PATCH bpf-next v1 10/13] selftests/bpf: Add dynptr pruning tests Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 11/13] selftests/bpf: Add dynptr var_off tests Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 12/13] selftests/bpf: Add dynptr partial slot overwrite tests Kumar Kartikeya Dwivedi
2022-10-18 13:59 ` [PATCH bpf-next v1 13/13] selftests/bpf: Add dynptr helper tests Kumar Kartikeya Dwivedi
2023-10-31 7:05 ` CVE-2023-39191 - Dynptr fixes - reg Nandhini Rengaraj
2023-10-31 7:13 ` Greg KH
2023-10-31 7:57 ` Shung-Hsi Yu
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