linux-kernel - [PATCH] init/Kconfig: Remove USELIB syscall by default

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Message-Id: <20220412212519.4113845-1-keescook@chromium.org>
Date:   Tue, 12 Apr 2022 14:25:20 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Nathan Chancellor <nathan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Kees Cook <keescook@...omium.org>,
        Masahiro Yamada <masahiroy@...nel.org>, x86@...nel.org,
        linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-hardening@...r.kernel.org
Subject: [PATCH] init/Kconfig: Remove USELIB syscall by default

The uselib syscall has been long deprecated. There's no need to keep
this enabled by default under X86_32.

Signed-off-by: Kees Cook <keescook@...omium.org>
---
 init/Kconfig | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index ddcbefe535e9..5cddb9ba0eef 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -435,8 +435,8 @@ config CROSS_MEMORY_ATTACH
 	  See the man page for more details.
 
 config USELIB
-	bool "uselib syscall"
-	def_bool ALPHA || M68K || SPARC || X86_32 || IA32_EMULATION
+	bool "uselib syscall (for libc5 and earlier)"
+	default ALPHA || M68K || SPARC
 	help
 	  This option enables the uselib syscall, a system call used in the
 	  dynamic linker from libc5 and earlier.  glibc does not use this
-- 
2.32.0