From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Namhyung Kim <namhyung@kernel.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>, Song Liu <song@kernel.org>,
Yonghong Song <yonghong.song@linux.dev>,
John Fastabend <john.fastabend@gmail.com>,
KP Singh <kpsingh@kernel.org>,
Stanislav Fomichev <sdf@fomichev.me>, Hao Luo <haoluo@google.com>,
Jiri Olsa <jolsa@kernel.org>,
LKML <linux-kernel@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Vlastimil Babka <vbabka@suse.cz>,
Roman Gushchin <roman.gushchin@linux.dev>,
Hyeonggon Yoo <42.hyeyoo@gmail.com>,
linux-mm <linux-mm@kvack.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>
Subject: Re: [RFC/PATCH bpf-next 2/3] mm/bpf: Add bpf_get_kmem_cache() kfunc
Date: Sun, 29 Sep 2024 10:05:42 -0700 [thread overview]
Message-ID: <CAADnVQKuR2-My5jYevwQS4K6QmOQVyfK3MYFngWMrc62ZET4ZA@mail.gmail.com> (raw)
In-Reply-To: <20240927184133.968283-3-namhyung@kernel.org>
On Fri, Sep 27, 2024 at 11:41 AM Namhyung Kim <namhyung@kernel.org> wrote:
>
> +__bpf_kfunc struct kmem_cache *bpf_get_kmem_cache(u64 addr)
> +{
> + struct slab *slab;
> +
> + slab = virt_to_slab((void *)(long)addr);
> + return slab ? slab->slab_cache : NULL;
> +}
I think this needs more safety guards on 'addr'.
It needs to check the valid range of 'addr' before doing virt_to_slab.
next prev parent reply other threads:[~2024-09-29 17:05 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-27 18:41 [RFC/PATCH bpf-next 0/3] bpf: Add kmem_cache iterator and kfunc (v2) Namhyung Kim
2024-09-27 18:41 ` [RFC/PATCH bpf-next 1/3] bpf: Add kmem_cache iterator Namhyung Kim
2024-09-29 17:04 ` Alexei Starovoitov
2024-09-30 2:08 ` Namhyung Kim
2024-10-01 18:23 ` Alexei Starovoitov
2024-09-27 18:41 ` [RFC/PATCH bpf-next 2/3] mm/bpf: Add bpf_get_kmem_cache() kfunc Namhyung Kim
2024-09-29 17:05 ` Alexei Starovoitov [this message]
2024-09-30 2:09 ` Namhyung Kim
2024-09-27 18:41 ` [RFC/PATCH bpf-next 3/3] selftests/bpf: Add a test for kmem_cache_iter Namhyung Kim
2024-09-29 6:13 ` Namhyung Kim
2024-09-29 14:27 ` Hyeonggon Yoo
2024-09-30 2:18 ` Namhyung Kim
2024-09-30 3:24 ` Hyeonggon Yoo
2024-09-30 4:33 ` Namhyung Kim
2024-09-30 17:48 ` Namhyung Kim
2024-09-29 17:00 ` [RFC/PATCH bpf-next 0/3] bpf: Add kmem_cache iterator and kfunc (v2) Alexei Starovoitov
2024-09-30 1:51 ` Namhyung Kim
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