linux-kernel - [RFC 14/16] arm64: crypto: Add exceptions for crypto object to prevent stack analysis

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Date:   Thu, 16 May 2019 11:36:53 +0100
From:   Raphael Gault <raphael.gault@....com>
To:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     jpoimboe@...hat.com, peterz@...radead.org, catalin.marinas@....com,
        will.deacon@....com, julien.thierry@....com,
        Raphael Gault <raphael.gault@....com>
Subject: [RFC 14/16] arm64: crypto: Add exceptions for crypto object to prevent stack analysis

Some crypto modules contain `.word` of data in the .text section.
Since objtool can't make the distinction between data and incorrect
instruction, it gives a warning about the instruction beeing unknown
and stops the analysis of the object file.

The exception can be removed if the data are moved to another section
or if objtool is tweaked to handle this particular case.

Signed-off-by: Raphael Gault <raphael.gault@....com>
---
 arch/arm64/crypto/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/crypto/Makefile b/arch/arm64/crypto/Makefile
index e766daf43b7c..d9125e7d4546 100644
--- a/arch/arm64/crypto/Makefile
+++ b/arch/arm64/crypto/Makefile
@@ -46,9 +46,11 @@ aes-neon-blk-y := aes-glue-neon.o aes-neon.o
 
 obj-$(CONFIG_CRYPTO_SHA256_ARM64) += sha256-arm64.o
 sha256-arm64-y := sha256-glue.o sha256-core.o
+OBJECT_FILES_NON_STANDARD_sha256-core.o := y
 
 obj-$(CONFIG_CRYPTO_SHA512_ARM64) += sha512-arm64.o
 sha512-arm64-y := sha512-glue.o sha512-core.o
+OBJECT_FILES_NON_STANDARD_sha512-core.o := y
 
 obj-$(CONFIG_CRYPTO_CHACHA20_NEON) += chacha-neon.o
 chacha-neon-y := chacha-neon-core.o chacha-neon-glue.o
@@ -61,6 +63,7 @@ aes-arm64-y := aes-cipher-core.o aes-cipher-glue.o
 
 obj-$(CONFIG_CRYPTO_AES_ARM64_BS) += aes-neon-bs.o
 aes-neon-bs-y := aes-neonbs-core.o aes-neonbs-glue.o
+OBJECT_FILES_NON_STANDARD_aes-neonbs-core.o := y
 
 CFLAGS_aes-glue-ce.o	:= -DUSE_V8_CRYPTO_EXTENSIONS
 
-- 
2.17.1