From: Kees Cook <keescook@chromium.org>
To: Sami Tolvanen <samitolvanen@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Will Deacon <will@kernel.org>, Jessica Yu <jeyu@kernel.org>,
Arnd Bergmann <arnd@arndb.de>, Tejun Heo <tj@kernel.org>,
bpf@vger.kernel.org, linux-hardening@vger.kernel.org,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kbuild@vger.kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 05/17] workqueue: cfi: disable callback pointer check with modules
Date: Thu, 11 Mar 2021 18:43:18 -0800 [thread overview]
Message-ID: <202103111840.58C5D95F@keescook> (raw)
In-Reply-To: <20210312004919.669614-6-samitolvanen@google.com>
On Thu, Mar 11, 2021 at 04:49:07PM -0800, Sami Tolvanen wrote:
> With CONFIG_CFI_CLANG, a callback function passed to
> __queue_delayed_work from a module points to a jump table entry
> defined in the module instead of the one used in the core kernel,
> which breaks function address equality in this check:
>
> WARN_ON_ONCE(timer->function != delayed_work_timer_fn);
>
> Disable the warning when CFI and modules are enabled.
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
WARNING: multiple messages have this Message-ID (diff)
From: Kees Cook <keescook@chromium.org>
To: Sami Tolvanen <samitolvanen@google.com>
Cc: Nathan Chancellor <nathan@kernel.org>,
Nick Desaulniers <ndesaulniers@google.com>,
Masahiro Yamada <masahiroy@kernel.org>,
Will Deacon <will@kernel.org>, Jessica Yu <jeyu@kernel.org>,
Arnd Bergmann <arnd@arndb.de>, Tejun Heo <tj@kernel.org>,
bpf@vger.kernel.org, linux-hardening@vger.kernel.org,
linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kbuild@vger.kernel.org, linux-pci@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 05/17] workqueue: cfi: disable callback pointer check with modules
Date: Thu, 11 Mar 2021 18:43:18 -0800 [thread overview]
Message-ID: <202103111840.58C5D95F@keescook> (raw)
In-Reply-To: <20210312004919.669614-6-samitolvanen@google.com>
On Thu, Mar 11, 2021 at 04:49:07PM -0800, Sami Tolvanen wrote:
> With CONFIG_CFI_CLANG, a callback function passed to
> __queue_delayed_work from a module points to a jump table entry
> defined in the module instead of the one used in the core kernel,
> which breaks function address equality in this check:
>
> WARN_ON_ONCE(timer->function != delayed_work_timer_fn);
>
> Disable the warning when CFI and modules are enabled.
Reviewed-by: Kees Cook <keescook@chromium.org>
--
Kees Cook
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next prev parent reply other threads:[~2021-03-12 2:43 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-12 0:49 [PATCH 00/17] Add support for Clang CFI Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 0:49 ` [PATCH 01/17] add " Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:39 ` Kees Cook
2021-03-12 2:39 ` Kees Cook
2021-03-12 0:49 ` [PATCH 02/17] cfi: add __cficanonical Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:40 ` Kees Cook
2021-03-12 2:40 ` Kees Cook
2021-03-12 20:28 ` Bjorn Helgaas
2021-03-12 20:28 ` Bjorn Helgaas
2021-03-12 0:49 ` [PATCH 03/17] mm: add generic __va_function and __pa_function macros Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:40 ` Kees Cook
2021-03-12 2:40 ` Kees Cook
2021-03-12 0:49 ` [PATCH 04/17] module: cfi: ensure __cfi_check alignment Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:39 ` Kees Cook
2021-03-12 2:39 ` Kees Cook
2021-03-16 20:03 ` Sami Tolvanen
2021-03-16 20:03 ` Sami Tolvanen
2021-03-12 0:49 ` [PATCH 05/17] workqueue: cfi: disable callback pointer check with modules Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:43 ` Kees Cook [this message]
2021-03-12 2:43 ` Kees Cook
2021-03-12 0:49 ` [PATCH 06/17] kthread: " Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:43 ` Kees Cook
2021-03-12 2:43 ` Kees Cook
2021-03-12 6:13 ` Christoph Hellwig
2021-03-12 6:13 ` Christoph Hellwig
2021-03-17 16:05 ` Sami Tolvanen
2021-03-17 16:05 ` Sami Tolvanen
2021-03-12 0:49 ` [PATCH 07/17] kallsyms: cfi: strip hashes from static functions Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:45 ` Kees Cook
2021-03-12 2:45 ` Kees Cook
2021-03-16 20:33 ` Sami Tolvanen
2021-03-16 20:33 ` Sami Tolvanen
2021-03-12 0:49 ` [PATCH 08/17] bpf: disable CFI in dispatcher functions Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:45 ` Kees Cook
2021-03-12 2:45 ` Kees Cook
2021-03-12 0:49 ` [PATCH 09/17] lib/list_sort: fix function type mismatches Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:45 ` Kees Cook
2021-03-12 2:45 ` Kees Cook
2021-03-12 0:49 ` [PATCH 10/17] lkdtm: use __va_function Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:45 ` Kees Cook
2021-03-12 2:45 ` Kees Cook
2021-03-12 0:49 ` [PATCH 11/17] psci: use __pa_function for cpu_resume Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:45 ` Kees Cook
2021-03-12 2:45 ` Kees Cook
2021-03-12 0:49 ` [PATCH 12/17] arm64: implement __va_function Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:46 ` Kees Cook
2021-03-12 2:46 ` Kees Cook
2021-03-12 0:49 ` [PATCH 13/17] arm64: use __pa_function Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:46 ` Kees Cook
2021-03-12 2:46 ` Kees Cook
2021-03-12 0:49 ` [PATCH 14/17] arm64: add __nocfi to functions that jump to a physical address Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:47 ` Kees Cook
2021-03-12 2:47 ` Kees Cook
2021-03-12 0:49 ` [PATCH 15/17] arm64: add __nocfi to __apply_alternatives Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:50 ` Kees Cook
2021-03-12 2:50 ` Kees Cook
2021-03-12 0:49 ` [PATCH 16/17] KVM: arm64: Disable CFI for nVHE Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:50 ` Kees Cook
2021-03-12 2:50 ` Kees Cook
2021-03-12 0:49 ` [PATCH 17/17] arm64: allow CONFIG_CFI_CLANG to be selected Sami Tolvanen
2021-03-12 0:49 ` Sami Tolvanen
2021-03-12 2:51 ` Kees Cook
2021-03-12 2:51 ` Kees Cook
2021-03-16 20:44 ` Sami Tolvanen
2021-03-16 20:44 ` Sami Tolvanen
2021-03-16 23:02 ` Kees Cook
2021-03-16 23:02 ` Kees Cook
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