[PATCH v4 02/21] scripts/kallsyms: Ignore __kcfi_typeid_

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From: Sami Tolvanen <samitolvanen@google.com>
To: linux-kernel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	 Peter Zijlstra <peterz@infradead.org>,
	x86@kernel.org,  Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	 Mark Rutland <mark.rutland@arm.com>,
	Nathan Chancellor <nathan@kernel.org>,
	 Nick Desaulniers <ndesaulniers@google.com>,
	Joao Moreira <joao@overdrivepizza.com>,
	 Sedat Dilek <sedat.dilek@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	 linux-hardening@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,  llvm@lists.linux.dev,
	Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH v4 02/21] scripts/kallsyms: Ignore __kcfi_typeid_
Date: Tue, 30 Aug 2022 16:31:10 -0700	[thread overview]
Message-ID: <20220830233129.30610-3-samitolvanen@google.com> (raw)
In-Reply-To: <20220830233129.30610-1-samitolvanen@google.com>

The compiler generates __kcfi_typeid_ symbols for annotating assembly
functions with type information. These are constants that can be
referenced in assembly code and are resolved by the linker. Ignore
them in kallsyms.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 scripts/kallsyms.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index f18e6dfc68c5..ccdf0c897f31 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -119,6 +119,7 @@ static bool is_ignored_symbol(const char *name, char type)
 		"__ThumbV7PILongThunk_",
 		"__LA25Thunk_",		/* mips lld */
 		"__microLA25Thunk_",
+		"__kcfi_typeid_",	/* CFI type identifiers */
 		NULL
 	};
 
-- 
2.37.2.672.g94769d06f0-goog

WARNING: multiple messages have this Message-ID (diff)

From: Sami Tolvanen <samitolvanen@google.com>
To: linux-kernel@vger.kernel.org
Cc: Kees Cook <keescook@chromium.org>,
	Josh Poimboeuf <jpoimboe@redhat.com>,
	 Peter Zijlstra <peterz@infradead.org>,
	x86@kernel.org,  Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>,
	 Mark Rutland <mark.rutland@arm.com>,
	Nathan Chancellor <nathan@kernel.org>,
	 Nick Desaulniers <ndesaulniers@google.com>,
	Joao Moreira <joao@overdrivepizza.com>,
	 Sedat Dilek <sedat.dilek@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	 linux-hardening@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,  llvm@lists.linux.dev,
	Sami Tolvanen <samitolvanen@google.com>
Subject: [PATCH v4 02/21] scripts/kallsyms: Ignore __kcfi_typeid_
Date: Tue, 30 Aug 2022 16:31:10 -0700	[thread overview]
Message-ID: <20220830233129.30610-3-samitolvanen@google.com> (raw)
In-Reply-To: <20220830233129.30610-1-samitolvanen@google.com>

The compiler generates __kcfi_typeid_ symbols for annotating assembly
functions with type information. These are constants that can be
referenced in assembly code and are resolved by the linker. Ignore
them in kallsyms.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
---
 scripts/kallsyms.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index f18e6dfc68c5..ccdf0c897f31 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -119,6 +119,7 @@ static bool is_ignored_symbol(const char *name, char type)
 		"__ThumbV7PILongThunk_",
 		"__LA25Thunk_",		/* mips lld */
 		"__microLA25Thunk_",
+		"__kcfi_typeid_",	/* CFI type identifiers */
 		NULL
 	};
 
-- 
2.37.2.672.g94769d06f0-goog


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next prev parent reply	other threads:[~2022-08-30 23:31 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-08-30 23:31 [PATCH v4 00/21] KCFI support Sami Tolvanen
2022-08-30 23:31 ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 01/21] treewide: Filter out CC_FLAGS_CFI Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` Sami Tolvanen [this message]
2022-08-30 23:31   ` [PATCH v4 02/21] scripts/kallsyms: Ignore __kcfi_typeid_ Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 03/21] cfi: Remove CONFIG_CFI_CLANG_SHADOW Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 04/21] cfi: Drop __CFI_ADDRESSABLE Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 05/21] cfi: Switch to -fsanitize=kcfi Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 06/21] cfi: Add type helper macros Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 07/21] lkdtm: Emit an indirect call for CFI tests Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 08/21] psci: Fix the function type for psci_initcall_t Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-31 18:22   ` Kees Cook
2022-08-31 18:22     ` Kees Cook
2022-08-30 23:31 ` [PATCH v4 09/21] arm64: Add types to indirect called assembly functions Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 10/21] arm64: Add CFI error handling Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 11/21] arm64: Drop unneeded __nocfi attributes Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 12/21] init: Drop __nocfi from __init Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 13/21] treewide: Drop function_nocfi Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 14/21] treewide: Drop WARN_ON_FUNCTION_MISMATCH Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 15/21] treewide: Drop __cficanonical Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 16/21] objtool: Disable CFI warnings Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-31 18:23   ` Kees Cook
2022-08-31 18:23     ` Kees Cook
2022-08-30 23:31 ` [PATCH v4 17/21] kallsyms: Drop CONFIG_CFI_CLANG workarounds Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-31 18:23   ` Kees Cook
2022-08-31 18:23     ` Kees Cook
2022-08-30 23:31 ` [PATCH v4 18/21] x86/tools/relocs: Ignore __kcfi_typeid_ relocations Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 19/21] x86: Add types to indirectly called assembly functions Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 20/21] x86/purgatory: Disable CFI Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-30 23:31 ` [PATCH v4 21/21] x86: Add support for CONFIG_CFI_CLANG Sami Tolvanen
2022-08-30 23:31   ` Sami Tolvanen
2022-08-31 18:28   ` Kees Cook
2022-08-31 18:28     ` Kees Cook
2022-08-31 22:04 ` [PATCH v4 00/21] KCFI support Kees Cook
2022-08-31 22:04   ` Kees Cook
2022-09-01 21:19 ` Nathan Chancellor
2022-09-01 21:19   ` Nathan Chancellor
2022-09-02  0:33   ` Sami Tolvanen
2022-09-02  0:33     ` Sami Tolvanen
2022-09-02  7:51     ` Peter Zijlstra
2022-09-02  7:51       ` Peter Zijlstra
2022-09-02 15:39       ` Sami Tolvanen
2022-09-02 15:39         ` Sami Tolvanen

find likely ancestor, descendant, or conflicting patches for this message:
dfblob:f18e6dfc68c dfblob:f18e6dfc68c dfblob:ccdf0c897f3
dfblob:ccdf0c897f3
	(help)

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