linux-kernel - [PATCH 08/10] um: Remove __access_ok

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Message-Id: <20251028-uml-remove-32bit-pseudo-vdso-v1-8-e930063eff5f@weissschuh.net>
Date: Tue, 28 Oct 2025 10:15:43 +0100
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Richard Weinberger <richard@....at>, 
 Anton Ivanov <anton.ivanov@...bridgegreys.com>, 
 Johannes Berg <johannes@...solutions.net>, 
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
 Kees Cook <kees@...nel.org>
Cc: linux-um@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-mm@...ck.org, 
 Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH 08/10] um: Remove __access_ok_vsyscall()

FIXADDR_USER_START and FIXADDR_USER_END are now always zero.

Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
 arch/um/include/asm/uaccess.h | 8 +-------
 1 file changed, 1 insertion(+), 7 deletions(-)

diff --git a/arch/um/include/asm/uaccess.h b/arch/um/include/asm/uaccess.h
index 3770bdeee100..0df9ea4abda8 100644
--- a/arch/um/include/asm/uaccess.h
+++ b/arch/um/include/asm/uaccess.h
@@ -15,10 +15,6 @@
 	(((unsigned long) (addr) < TASK_SIZE) && \
 	 (((unsigned long) (addr) + (size)) < TASK_SIZE))

-#define __access_ok_vsyscall(addr, size) \
-	  (((unsigned long) (addr) >= FIXADDR_USER_START) && \
-	  ((unsigned long) (addr) + (size) <= FIXADDR_USER_END))
-
 #define __addr_range_nowrap(addr, size) \
 	((unsigned long) (addr) <= ((unsigned long) (addr) + (size)))

@@ -39,9 +35,7 @@ static inline int __access_ok(const void __user *ptr, unsigned long size);
 static inline int __access_ok(const void __user *ptr, unsigned long size)
 {
 	unsigned long addr = (unsigned long)ptr;
-	return __addr_range_nowrap(addr, size) &&
-		(__under_task_size(addr, size) ||
-		 __access_ok_vsyscall(addr, size));
+	return __addr_range_nowrap(addr, size) && __under_task_size(addr, size);
 }

 #define __get_kernel_nofault(dst, src, type, err_label)			\

-- 
2.51.1.dirty