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Message-Id: <1531906876-13451-34-git-send-email-joro@8bytes.org>
Date: Wed, 18 Jul 2018 11:41:10 +0200
From: Joerg Roedel <joro@...tes.org>
To: Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>,
"H . Peter Anvin" <hpa@...or.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org,
Linus Torvalds <torvalds@...ux-foundation.org>,
Andy Lutomirski <luto@...nel.org>,
Dave Hansen <dave.hansen@...el.com>,
Josh Poimboeuf <jpoimboe@...hat.com>,
Juergen Gross <jgross@...e.com>,
Peter Zijlstra <peterz@...radead.org>,
Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
Boris Ostrovsky <boris.ostrovsky@...cle.com>,
Brian Gerst <brgerst@...il.com>,
David Laight <David.Laight@...lab.com>,
Denys Vlasenko <dvlasenk@...hat.com>,
Eduardo Valentin <eduval@...zon.com>,
Greg KH <gregkh@...uxfoundation.org>,
Will Deacon <will.deacon@....com>, aliguori@...zon.com,
daniel.gruss@...k.tugraz.at, hughd@...gle.com, keescook@...gle.com,
Andrea Arcangeli <aarcange@...hat.com>,
Waiman Long <llong@...hat.com>, Pavel Machek <pavel@....cz>,
"David H . Gutteridge" <dhgutteridge@...patico.ca>,
jroedel@...e.de, joro@...tes.org
Subject: [PATCH 33/39] x86/ldt: Reserve address-space range on 32 bit for the LDT
From: Joerg Roedel <jroedel@...e.de>
Reserve 2MB/4MB of address-space for mapping the LDT to
user-space on 32 bit PTI kernels.
Signed-off-by: Joerg Roedel <jroedel@...e.de>
---
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 d9a001a..7297810 100644
--- a/arch/x86/include/asm/pgtable_32_types.h
+++ b/arch/x86/include/asm/pgtable_32_types.h
@@ -50,13 +50,16 @@ 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 e6fd0cd..ccd92c4 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -123,6 +123,9 @@ 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,
@@ -136,6 +139,9 @@ 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 }
@@ -609,6 +615,9 @@ 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
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