linux-kernel - [PATCH 09/14] m68k: drop custom __access

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Message-Id: <20220214163452.1568807-10-arnd@kernel.org>
Date:   Mon, 14 Feb 2022 17:34:47 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org, arnd@...db.de,
        linux-kernel@...r.kernel.org
Cc:     linux@...linux.org.uk, will@...nel.org, guoren@...nel.org,
        bcain@...eaurora.org, geert@...ux-m68k.org, monstr@...str.eu,
        tsbogend@...ha.franken.de, nickhu@...estech.com,
        green.hu@...il.com, dinguyen@...nel.org, shorne@...il.com,
        deller@....de, mpe@...erman.id.au, peterz@...radead.org,
        mingo@...hat.com, mark.rutland@....com, hca@...ux.ibm.com,
        dalias@...c.org, davem@...emloft.net, richard@....at,
        x86@...nel.org, jcmvbkbc@...il.com, ebiederm@...ssion.com,
        akpm@...ux-foundation.org, ardb@...nel.org,
        linux-alpha@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-csky@...r.kernel.org,
        linux-hexagon@...r.kernel.org, linux-ia64@...r.kernel.org,
        linux-m68k@...ts.linux-m68k.org, linux-mips@...r.kernel.org,
        openrisc@...ts.librecores.org, linux-parisc@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linux-um@...ts.infradead.org,
        linux-xtensa@...ux-xtensa.org
Subject: [PATCH 09/14] m68k: drop custom __access_ok()

From: Arnd Bergmann <arnd@...db.de>

While most m68k platforms use separate address spaces for user
and kernel space, at least coldfire does not, and the other
ones have a TASK_SIZE that is less than the entire 4GB address
range.

Using the generic implementation of __access_ok() stops coldfire
user space from trivially accessing kernel memory, and is probably
the right thing elsewhere for consistency as well.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/m68k/include/asm/uaccess.h | 13 -------------
 1 file changed, 13 deletions(-)

diff --git a/arch/m68k/include/asm/uaccess.h b/arch/m68k/include/asm/uaccess.h
index d6bb5720365a..64914872a5c9 100644
--- a/arch/m68k/include/asm/uaccess.h
+++ b/arch/m68k/include/asm/uaccess.h
@@ -10,19 +10,6 @@
 #include <linux/compiler.h>
 #include <linux/types.h>
 #include <asm/extable.h>
-
-/* We let the MMU do all checking */
-static inline int __access_ok(const void __user *addr,
-			    unsigned long size)
-{
-	/*
-	 * XXX: for !CONFIG_CPU_HAS_ADDRESS_SPACES this really needs to check
-	 * for TASK_SIZE!
-	 * Removing this helper is probably sufficient.
-	 */
-	return 1;
-}
-#define __access_ok __access_ok
 #include <asm-generic/access_ok.h>
 
 /*
-- 
2.29.2