Re: [PATCH 15/17] arm64: add __nocfi to __apply_alternatives | linux-arm-kernel

[PATCH 00/17] Add support for Clang CFI · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
[PATCH 02/17] cfi: add __cficanonical · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 02/17] cfi: add __cficanonical · Kees Cook <hidden> · 2021-03-12
Re: [PATCH 02/17] cfi: add __cficanonical · Bjorn Helgaas <helgaas@kernel.org> · 2021-03-12
[PATCH 01/17] add support for Clang CFI · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 01/17] add support for Clang CFI · Kees Cook <hidden> · 2021-03-12
[PATCH 03/17] mm: add generic __va_function and __pa_function macros · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 03/17] mm: add generic __va_function and __pa_function macros · Kees Cook <hidden> · 2021-03-12
[PATCH 04/17] module: cfi: ensure __cfi_check alignment · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 04/17] module: cfi: ensure __cfi_check alignment · Kees Cook <hidden> · 2021-03-12
Re: [PATCH 04/17] module: cfi: ensure __cfi_check alignment · Sami Tolvanen <samitolvanen@google.com> · 2021-03-16
[PATCH 05/17] workqueue: cfi: disable callback pointer check with modules · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 05/17] workqueue: cfi: disable callback pointer check with modules · Kees Cook <hidden> · 2021-03-12
[PATCH 07/17] kallsyms: cfi: strip hashes from static functions · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 07/17] kallsyms: cfi: strip hashes from static functions · Kees Cook <hidden> · 2021-03-12
Re: [PATCH 07/17] kallsyms: cfi: strip hashes from static functions · Sami Tolvanen <samitolvanen@google.com> · 2021-03-16
[PATCH 08/17] bpf: disable CFI in dispatcher functions · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 08/17] bpf: disable CFI in dispatcher functions · Kees Cook <hidden> · 2021-03-12
[PATCH 09/17] lib/list_sort: fix function type mismatches · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 09/17] lib/list_sort: fix function type mismatches · Kees Cook <hidden> · 2021-03-12
[PATCH 06/17] kthread: cfi: disable callback pointer check with modules · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 06/17] kthread: cfi: disable callback pointer check with modules · Kees Cook <hidden> · 2021-03-12
Re: [PATCH 06/17] kthread: cfi: disable callback pointer check with modules · Christoph Hellwig <hch@infradead.org> · 2021-03-12
Re: [PATCH 06/17] kthread: cfi: disable callback pointer check with modules · Sami Tolvanen <samitolvanen@google.com> · 2021-03-17
[PATCH 11/17] psci: use __pa_function for cpu_resume · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 11/17] psci: use __pa_function for cpu_resume · Kees Cook <hidden> · 2021-03-12
[PATCH 10/17] lkdtm: use __va_function · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 10/17] lkdtm: use __va_function · Kees Cook <hidden> · 2021-03-12
[PATCH 12/17] arm64: implement __va_function · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 12/17] arm64: implement __va_function · Kees Cook <hidden> · 2021-03-12
[PATCH 13/17] arm64: use __pa_function · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 13/17] arm64: use __pa_function · Kees Cook <hidden> · 2021-03-12
[PATCH 14/17] arm64: add __nocfi to functions that jump to a physical address · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 14/17] arm64: add __nocfi to functions that jump to a physical address · Kees Cook <hidden> · 2021-03-12
[PATCH 15/17] arm64: add __nocfi to __apply_alternatives · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 15/17] arm64: add __nocfi to __apply_alternatives · Kees Cook <hidden> · 2021-03-12
[PATCH 16/17] KVM: arm64: Disable CFI for nVHE · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 16/17] KVM: arm64: Disable CFI for nVHE · Kees Cook <hidden> · 2021-03-12
[PATCH 17/17] arm64: allow CONFIG_CFI_CLANG to be selected · Sami Tolvanen <samitolvanen@google.com> · 2021-03-12
Re: [PATCH 17/17] arm64: allow CONFIG_CFI_CLANG to be selected · Kees Cook <hidden> · 2021-03-12
Re: [PATCH 17/17] arm64: allow CONFIG_CFI_CLANG to be selected · Sami Tolvanen <samitolvanen@google.com> · 2021-03-16
Re: [PATCH 17/17] arm64: allow CONFIG_CFI_CLANG to be selected · Kees Cook <hidden> · 2021-03-16

Re: [PATCH 15/17] arm64: add nocfi to apply_alternatives

From: Kees Cook <hidden>
Date: 2021-03-12 02:51:28
Also in: bpf, linux-arch, linux-hardening, linux-kbuild, linux-pci, lkml

On Thu, Mar 11, 2021 at 04:49:17PM -0800, Sami Tolvanen wrote:

__apply_alternatives makes indirect calls to functions whose address
is taken in assembly code using the alternative_cb macro. With
non-canonical CFI, the compiler won't replace these function
references with the jump table addresses, which trips CFI. Disable CFI
checking in the function to work around the issue.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>

Reviewed-by: Kees Cook <redacted>

-- 
Kees Cook

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