From nobody Wed Feb 11 02:54:45 2026 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D4F643016F7 for ; Tue, 28 Oct 2025 09:17:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761643045; cv=none; b=BOg75wU8GEGW4iNCfhdn6ErD/SKhdI8O78TohQR/vqKWGnMpRARA+1FEmiJm0kkkXwLosOjjVof/pNSjmx0zFldzMVZs9JVS6hXFFGx1nHTHKWrsbVJlm4sp/I7Mjnev26tb8qBdR3YH0JLl8KpGUduq2lHW+Kpb0Z8WhYzgZbA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1761643045; c=relaxed/simple; bh=vszDF/cx4qHYXXIt4CCpd4y86yZhshQ+o4PVe1g7Y50=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=OEhZdBt5rjXE5nux+TYUAiIUlBNYtWAa25wdhQH/7L2ie5EodL2dVsTnyfI+h03rfkbqzpplwHHLx2zs7E51y6I8xvbaYiM7F4wka8taLfEcZXehcMDrjTNs7k8I6mvZdQjfMz/IZk8aP18UgKWbV/OmukFfS8DwM6ecNOf9Rpo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=g4iOmek2; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="g4iOmek2" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1761643038; bh=vszDF/cx4qHYXXIt4CCpd4y86yZhshQ+o4PVe1g7Y50=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=g4iOmek2Pwb6uaHO9W+u8eso4VNQkDSU25wRqBElFVpQ8AW3A2IfvYY4xFaRdfeK6 zEYDZMZis6+oV/rFJ2NiXsUZGNdNOvetfhbmxtX9XJLFGpk9Pzfe6Yir6auEGfA+Be 3DzYkFALhdgDxn8UbMJq0+NthKJSN9gSw7gyLDRw= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Tue, 28 Oct 2025 10:15:40 +0100 Subject: [PATCH 05/10] x86/um: Drop gate area handling Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251028-uml-remove-32bit-pseudo-vdso-v1-5-e930063eff5f@weissschuh.net> References: <20251028-uml-remove-32bit-pseudo-vdso-v1-0-e930063eff5f@weissschuh.net> In-Reply-To: <20251028-uml-remove-32bit-pseudo-vdso-v1-0-e930063eff5f@weissschuh.net> To: Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Kees Cook Cc: linux-um@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=ed25519-sha256; t=1761643036; l=2787; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=vszDF/cx4qHYXXIt4CCpd4y86yZhshQ+o4PVe1g7Y50=; b=o4JmUMvwtaLOa6D398C8FcQZo9AegfjrZ0mzUtV8o6ruPGtlXeeSvSB1/HNV+nBp+yjVHkJSq 0+5+Nf0zAGFCVqYDRn7QlgelnwkKGaCgWpd/sXbvXYOnmwS3ORxXiCa X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= With the removal of the vDSO passthrough from the host, FIXADDR_USER_START is always 0 and the gate area setup code is dead. Remove it. Signed-off-by: Thomas Wei=C3=9Fschuh --- arch/um/include/asm/page.h | 4 ---- arch/x86/um/Makefile | 4 ++-- arch/x86/um/mem_32.c | 50 ------------------------------------------= ---- 3 files changed, 2 insertions(+), 56 deletions(-) diff --git a/arch/um/include/asm/page.h b/arch/um/include/asm/page.h index 6f54254aaf44..2d363460d896 100644 --- a/arch/um/include/asm/page.h +++ b/arch/um/include/asm/page.h @@ -96,8 +96,4 @@ extern unsigned long uml_physmem; =20 #endif /* __ASSEMBLER__ */ =20 -#ifdef CONFIG_X86_32 -#define __HAVE_ARCH_GATE_AREA 1 -#endif - #endif /* __UM_PAGE_H */ diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile index 1767e6061b4d..f9ea75bf43ac 100644 --- a/arch/x86/um/Makefile +++ b/arch/x86/um/Makefile @@ -13,7 +13,7 @@ obj-y =3D bugs_$(BITS).o delay.o fault.o \ ptrace.o ptrace_$(BITS).o ptrace_user.o setjmp_$(BITS).o signal.o \ stub_segv.o \ sys_call_table_$(BITS).o sysrq_$(BITS).o tls_$(BITS).o \ - mem_$(BITS).o subarch.o os-Linux/ + subarch.o os-Linux/ =20 ifeq ($(CONFIG_X86_32),y) =20 @@ -26,7 +26,7 @@ subarch-y +=3D ../kernel/sys_ia32.o =20 else =20 -obj-y +=3D syscalls_64.o vdso/ +obj-y +=3D mem_64.o syscalls_64.o vdso/ =20 subarch-y =3D ../lib/csum-partial_64.o ../lib/memcpy_64.o \ ../lib/memmove_64.o ../lib/memset_64.o diff --git a/arch/x86/um/mem_32.c b/arch/x86/um/mem_32.c deleted file mode 100644 index 29b2203bc82c..000000000000 --- a/arch/x86/um/mem_32.c +++ /dev/null @@ -1,50 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-only -/* - * Copyright (C) 2011 Richard Weinberger - */ - -#include -#include - -static struct vm_area_struct gate_vma; - -static int __init gate_vma_init(void) -{ - if (!FIXADDR_USER_START) - return 0; - - vma_init(&gate_vma, NULL); - gate_vma.vm_start =3D FIXADDR_USER_START; - gate_vma.vm_end =3D FIXADDR_USER_END; - vm_flags_init(&gate_vma, VM_READ | VM_MAYREAD | VM_EXEC | VM_MAYEXEC); - gate_vma.vm_page_prot =3D PAGE_READONLY; - - return 0; -} -__initcall(gate_vma_init); - -struct vm_area_struct *get_gate_vma(struct mm_struct *mm) -{ - return FIXADDR_USER_START ? &gate_vma : NULL; -} - -int in_gate_area_no_mm(unsigned long addr) -{ - if (!FIXADDR_USER_START) - return 0; - - if ((addr >=3D FIXADDR_USER_START) && (addr < FIXADDR_USER_END)) - return 1; - - return 0; -} - -int in_gate_area(struct mm_struct *mm, unsigned long addr) -{ - struct vm_area_struct *vma =3D get_gate_vma(mm); - - if (!vma) - return 0; - - return (addr >=3D vma->vm_start) && (addr < vma->vm_end); -} --=20 2.51.1.dirty