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>, Mark Rutland <mark.rutland@arm.com>, Catalin Marinas <catalin.marinas@arm.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 v6 08/18] bpf: disable CFI in dispatcher functions Date: Thu, 8 Apr 2021 11:28:33 -0700 [thread overview] Message-ID: <20210408182843.1754385-9-samitolvanen@google.com> (raw) In-Reply-To: <20210408182843.1754385-1-samitolvanen@google.com> BPF dispatcher functions are patched at runtime to perform direct instead of indirect calls. Disable CFI for the dispatcher functions to avoid conflicts. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Tested-by: Nathan Chancellor <nathan@kernel.org> --- include/linux/bpf.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 3625f019767d..2f46f98479e1 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -650,7 +650,7 @@ struct bpf_dispatcher { struct bpf_ksym ksym; }; -static __always_inline unsigned int bpf_dispatcher_nop_func( +static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func( const void *ctx, const struct bpf_insn *insnsi, unsigned int (*bpf_func)(const void *, @@ -678,7 +678,7 @@ void bpf_trampoline_put(struct bpf_trampoline *tr); } #define DEFINE_BPF_DISPATCHER(name) \ - noinline unsigned int bpf_dispatcher_##name##_func( \ + noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \ const void *ctx, \ const struct bpf_insn *insnsi, \ unsigned int (*bpf_func)(const void *, \ -- 2.31.1.295.g9ea45b61b8-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>, Mark Rutland <mark.rutland@arm.com>, Catalin Marinas <catalin.marinas@arm.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 v6 08/18] bpf: disable CFI in dispatcher functions Date: Thu, 8 Apr 2021 11:28:33 -0700 [thread overview] Message-ID: <20210408182843.1754385-9-samitolvanen@google.com> (raw) In-Reply-To: <20210408182843.1754385-1-samitolvanen@google.com> BPF dispatcher functions are patched at runtime to perform direct instead of indirect calls. Disable CFI for the dispatcher functions to avoid conflicts. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Tested-by: Nathan Chancellor <nathan@kernel.org> --- include/linux/bpf.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 3625f019767d..2f46f98479e1 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -650,7 +650,7 @@ struct bpf_dispatcher { struct bpf_ksym ksym; }; -static __always_inline unsigned int bpf_dispatcher_nop_func( +static __always_inline __nocfi unsigned int bpf_dispatcher_nop_func( const void *ctx, const struct bpf_insn *insnsi, unsigned int (*bpf_func)(const void *, @@ -678,7 +678,7 @@ void bpf_trampoline_put(struct bpf_trampoline *tr); } #define DEFINE_BPF_DISPATCHER(name) \ - noinline unsigned int bpf_dispatcher_##name##_func( \ + noinline __nocfi unsigned int bpf_dispatcher_##name##_func( \ const void *ctx, \ const struct bpf_insn *insnsi, \ unsigned int (*bpf_func)(const void *, \ -- 2.31.1.295.g9ea45b61b8-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:[~2021-04-08 18:29 UTC|newest] Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-04-08 18:28 [PATCH v6 00/18] Add support for Clang CFI Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 01/18] add " Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 02/18] cfi: add __cficanonical Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 03/18] mm: add generic function_nocfi macro Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 04/18] module: ensure __cfi_check alignment Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 05/18] workqueue: use WARN_ON_FUNCTION_MISMATCH Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 06/18] kthread: " Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 07/18] kallsyms: strip ThinLTO hashes from static functions Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen [this message] 2021-04-08 18:28 ` [PATCH v6 08/18] bpf: disable CFI in dispatcher functions Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 09/18] treewide: Change list_sort to use const pointers Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 10/18] lkdtm: use function_nocfi Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 11/18] psci: use function_nocfi for cpu_resume Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 12/18] arm64: implement function_nocfi Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 13/18] arm64: use function_nocfi with __pa_symbol Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 14/18] arm64: add __nocfi to functions that jump to a physical address Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 15/18] arm64: add __nocfi to __apply_alternatives Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 16/18] arm64: ftrace: use function_nocfi for ftrace_call Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 17/18] KVM: arm64: Disable CFI for nVHE Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 18:28 ` [PATCH v6 18/18] arm64: allow CONFIG_CFI_CLANG to be selected Sami Tolvanen 2021-04-08 18:28 ` Sami Tolvanen 2021-04-08 22:59 ` [PATCH v6 00/18] Add support for Clang CFI Kees Cook 2021-04-08 22:59 ` Kees Cook
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