From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELtSNG/8rLs+t1dtzXjxGVr2aH2TBlZgck0nVGXKNy90nKm3xLhlNlx4jPfvw2OpsSt8Wl66 ARC-Seal: i=1; a=rsa-sha256; t=1520245582; cv=none; d=google.com; s=arc-20160816; b=FbSOqDJr0eiy0lWWHTDctU9GteU4XbGbMkFRCsjGyHdJ9/9cwc1qF7t7xaazpoyuXi 4INPBzcIk6DzXFU70QtRyTJV8IzbvDsJBmbz6SZX9v2DOC6JwxF1BgZASPaM00tJtCgZ PvPJFqIBE0SHy+lcfxedNvVswc6C3VtfNRmrMf5DbpCsLUQvsKB0Tty34YASRttSiBo9 AORvUKWJuD/rT9+orlDrZnkfiFhUfxp7Z/wGnVwjm5cqz8wEXh/I7Wpn91KNgrDkIoY8 BX+gtnberOrV9x6ASUVX9WHF4ET+YRrKCvEq0odfDhiSUmoASY8rBCTFZtVb53P6ub6/ xY0w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature:arc-authentication-results; bh=N4WE/Zg3/azljJ9vk+e7rysEuRey95VTb4WIU/mTR/Y=; b=CQ4sGYQDpTH+Uzbgycus4bpPML2SglQlOzmXOtzG/ElG19/IV8tw/D7dzFI9F8VFow Kn/OzD2r3u8FmAPhMf2UyiPJVMHkTNDEbeny7FQ8a7iQn2qj7tYnMQIW5DovvtjBOJ2K fMIJQmFjOvRvTOTbVOqXo214MCNgEsVDMA6bCfexcbM9HwLJliGlfb94Jj3FvTuMFde6 DJFx7oYXuVB3jeY3VLEjsEPg3EbbM0Niz+u4bTU17diPVCkt+zkdSwZ3boLksJWZp3x7 twSi1eZZBBRvNU2i9pC7PIwVHwGjJ3hP99Fl6cqGaOgK++EK/61uaqJhj6V+DetF2cf2 Kx+g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=gYuZ9HXp; spf=pass (google.com: domain of joro@8bytes.org designates 81.169.241.247 as permitted sender) smtp.mailfrom=joro@8bytes.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=8bytes.org Authentication-Results: mx.google.com; dkim=pass (test mode) header.i=@8bytes.org header.s=mail-1 header.b=gYuZ9HXp; spf=pass (google.com: domain of joro@8bytes.org designates 81.169.241.247 as permitted sender) smtp.mailfrom=joro@8bytes.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=8bytes.org From: Joerg Roedel To: Thomas Gleixner , Ingo Molnar , "H . Peter Anvin" Cc: x86@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Linus Torvalds , Andy Lutomirski , Dave Hansen , Josh Poimboeuf , Juergen Gross , Peter Zijlstra , Borislav Petkov , Jiri Kosina , Boris Ostrovsky , Brian Gerst , David Laight , Denys Vlasenko , Eduardo Valentin , Greg KH , Will Deacon , aliguori@amazon.com, daniel.gruss@iaik.tugraz.at, hughd@google.com, keescook@google.com, Andrea Arcangeli , Waiman Long , Pavel Machek , jroedel@suse.de, joro@8bytes.org Subject: [PATCH 29/34] x86/ldt: Reserve address-space range on 32 bit for the LDT Date: Mon, 5 Mar 2018 11:25:58 +0100 Message-Id: <1520245563-8444-30-git-send-email-joro@8bytes.org> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1520245563-8444-1-git-send-email-joro@8bytes.org> References: <1520245563-8444-1-git-send-email-joro@8bytes.org> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1594093032801102636?= X-GMAIL-MSGID: =?utf-8?q?1594093032801102636?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: From: Joerg Roedel Reserve 2MB/4MB of address-space for mapping the LDT to user-space on 32 bit PTI kernels. Signed-off-by: Joerg Roedel --- arch/x86/include/asm/pgtable_32_types.h | 7 +++++-- arch/x86/mm/dump_pagetables.c | 9 +++++++++ 2 files changed, 14 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/pgtable_32_types.h b/arch/x86/include/asm/pgtable_32_types.h index 0777e18..eb2e97a 100644 --- a/arch/x86/include/asm/pgtable_32_types.h +++ b/arch/x86/include/asm/pgtable_32_types.h @@ -48,13 +48,16 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */ ((FIXADDR_TOT_START - PAGE_SIZE * (CPU_ENTRY_AREA_PAGES + 1)) \ & PMD_MASK) -#define PKMAP_BASE \ +#define LDT_BASE_ADDR \ ((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK) +#define PKMAP_BASE \ + ((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK) + #ifdef CONFIG_HIGHMEM # define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE) #else -# define VMALLOC_END (CPU_ENTRY_AREA_BASE - 2 * PAGE_SIZE) +# define VMALLOC_END (LDT_BASE_ADDR - 2 * PAGE_SIZE) #endif #define MODULES_VADDR VMALLOC_START diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c index 2151ebb..fdefdf0 100644 --- a/arch/x86/mm/dump_pagetables.c +++ b/arch/x86/mm/dump_pagetables.c @@ -117,6 +117,9 @@ enum address_markers_idx { #ifdef CONFIG_HIGHMEM PKMAP_BASE_NR, #endif +#ifdef CONFIG_MODIFY_LDT_SYSCALL + LDT_NR, +#endif CPU_ENTRY_AREA_NR, FIXADDR_START_NR, END_OF_SPACE_NR, @@ -130,6 +133,9 @@ static struct addr_marker address_markers[] = { #ifdef CONFIG_HIGHMEM [PKMAP_BASE_NR] = { 0UL, "Persistent kmap() Area" }, #endif +#ifdef CONFIG_MODIFY_LDT_SYSCALL + [LDT_NR] = { 0UL, "LDT remap" }, +#endif [CPU_ENTRY_AREA_NR] = { 0UL, "CPU entry area" }, [FIXADDR_START_NR] = { 0UL, "Fixmap area" }, [END_OF_SPACE_NR] = { -1, NULL } @@ -579,6 +585,9 @@ static int __init pt_dump_init(void) # endif address_markers[FIXADDR_START_NR].start_address = FIXADDR_START; address_markers[CPU_ENTRY_AREA_NR].start_address = CPU_ENTRY_AREA_BASE; +# ifdef CONFIG_MODIFY_LDT_SYSCALL + address_markers[LDT_NR].start_address = LDT_BASE_ADDR; +# endif #endif return 0; } -- 2.7.4