From: Sami Tolvanen <samitolvanen@google.com> To: Kees Cook <keescook@chromium.org> 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>, "Paul E. McKenney" <paulmck@kernel.org>, Christoph Hellwig <hch@infradead.org>, Peter Zijlstra <peterz@infradead.org>, Sedat Dilek <sedat.dilek@gmail.com>, 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, clang-built-linux@googlegroups.com, Sami Tolvanen <samitolvanen@google.com> Subject: [PATCH v4 15/17] arm64: add __nocfi to __apply_alternatives Date: Wed, 31 Mar 2021 14:27:19 -0700 [thread overview] Message-ID: <20210331212722.2746212-16-samitolvanen@google.com> (raw) In-Reply-To: <20210331212722.2746212-1-samitolvanen@google.com> __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 <keescook@chromium.org> --- arch/arm64/kernel/alternative.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c index 1184c44ea2c7..abc84636af07 100644 --- a/arch/arm64/kernel/alternative.c +++ b/arch/arm64/kernel/alternative.c @@ -133,8 +133,8 @@ static void clean_dcache_range_nopatch(u64 start, u64 end) } while (cur += d_size, cur < end); } -static void __apply_alternatives(void *alt_region, bool is_module, - unsigned long *feature_mask) +static void __nocfi __apply_alternatives(void *alt_region, bool is_module, + unsigned long *feature_mask) { struct alt_instr *alt; struct alt_region *region = alt_region; -- 2.31.0.291.g576ba9dcdaf-goog
WARNING: multiple messages have this Message-ID (diff)
From: Sami Tolvanen <samitolvanen@google.com> To: Kees Cook <keescook@chromium.org> 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>, "Paul E. McKenney" <paulmck@kernel.org>, Christoph Hellwig <hch@infradead.org>, Peter Zijlstra <peterz@infradead.org>, Sedat Dilek <sedat.dilek@gmail.com>, 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, clang-built-linux@googlegroups.com, Sami Tolvanen <samitolvanen@google.com> Subject: [PATCH v4 15/17] arm64: add __nocfi to __apply_alternatives Date: Wed, 31 Mar 2021 14:27:19 -0700 [thread overview] Message-ID: <20210331212722.2746212-16-samitolvanen@google.com> (raw) In-Reply-To: <20210331212722.2746212-1-samitolvanen@google.com> __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 <keescook@chromium.org> --- arch/arm64/kernel/alternative.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c index 1184c44ea2c7..abc84636af07 100644 --- a/arch/arm64/kernel/alternative.c +++ b/arch/arm64/kernel/alternative.c @@ -133,8 +133,8 @@ static void clean_dcache_range_nopatch(u64 start, u64 end) } while (cur += d_size, cur < end); } -static void __apply_alternatives(void *alt_region, bool is_module, - unsigned long *feature_mask) +static void __nocfi __apply_alternatives(void *alt_region, bool is_module, + unsigned long *feature_mask) { struct alt_instr *alt; struct alt_region *region = alt_region; -- 2.31.0.291.g576ba9dcdaf-goog _______________________________________________ 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:[~2021-03-31 21:29 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-03-31 21:27 [PATCH v4 00/17] Add support for Clang CFI Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 01/17] add " Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 02/17] cfi: add __cficanonical Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 03/17] mm: add generic function_nocfi macro Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 04/17] module: ensure __cfi_check alignment Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-04-01 1:31 ` kernel test robot 2021-04-01 16:24 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 05/17] workqueue: use WARN_ON_FUNCTION_MISMATCH Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 06/17] kthread: " Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 07/17] kallsyms: strip ThinLTO hashes from static functions Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 08/17] bpf: disable CFI in dispatcher functions Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 09/17] treewide: Change list_sort to use const pointers Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 10/17] lkdtm: use function_nocfi Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 11/17] psci: use function_nocfi for cpu_resume Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 12/17] arm64: implement function_nocfi Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 13/17] arm64: use function_nocfi with __pa_symbol Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 14/17] arm64: add __nocfi to functions that jump to a physical address Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen [this message] 2021-03-31 21:27 ` [PATCH v4 15/17] arm64: add __nocfi to __apply_alternatives Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 16/17] KVM: arm64: Disable CFI for nVHE Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:27 ` [PATCH v4 17/17] arm64: allow CONFIG_CFI_CLANG to be selected Sami Tolvanen 2021-03-31 21:27 ` Sami Tolvanen 2021-03-31 21:46 ` [PATCH v4 00/17] Add support for Clang CFI Kees Cook 2021-03-31 21:46 ` Kees Cook
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