linux-hardening - Re: [PATCH bpf-next v3] bpf/verifier: Use kmalloc_size

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Date:   Mon, 21 Nov 2022 14:20:16 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Kees Cook <keescook@...omium.org>
Cc:     ast@...nel.org, daniel@...earbox.net, john.fastabend@...il.com,
        andrii@...nel.org, martin.lau@...ux.dev, song@...nel.org,
        yhs@...com, kpsingh@...nel.org, sdf@...gle.com, haoluo@...gle.com,
        jolsa@...nel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH bpf-next v3] bpf/verifier: Use kmalloc_size_roundup() to match
 ksize() usage

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Daniel Borkmann <daniel@...earbox.net>:

On Fri, 18 Nov 2022 10:34:14 -0800 you wrote:
> Most allocation sites in the kernel want an explicitly sized allocation
> (and not "more"), and that dynamic runtime analysis tools (e.g. KASAN,
> UBSAN_BOUNDS, FORTIFY_SOURCE, etc) are looking for precise bounds checking
> (i.e. not something that is rounded up). A tiny handful of allocations
> were doing an implicit alloc/realloc loop that actually depended on
> ksize(), and didn't actually always call realloc. This has created a
> long series of bugs and problems over many years related to the runtime
> bounds checking, so these callers are finally being adjusted to _not_
> depend on the ksize() side-effect, by doing one of several things:
> 
> [...]

Here is the summary with links:
  - [bpf-next,v3] bpf/verifier: Use kmalloc_size_roundup() to match ksize() usage
    https://git.kernel.org/bpf/bpf-next/c/ceb35b666d42

You are awesome, thank you!
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