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x86/ldt: Reserve address-space range on 32 bit for the LDT
Reserve 2MB/4MB of address-space for mapping the LDT to user-space on 32 bit PTI kernels. Signed-off-by: Joerg Roedel <jroedel@suse.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Pavel Machek <pavel@ucw.cz> Cc: "H . Peter Anvin" <hpa@zytor.com> Cc: linux-mm@kvack.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Juergen Gross <jgross@suse.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Jiri Kosina <jkosina@suse.cz> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: David Laight <David.Laight@aculab.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eduardo Valentin <eduval@amazon.com> Cc: Greg KH <gregkh@linuxfoundation.org> Cc: Will Deacon <will.deacon@arm.com> Cc: aliguori@amazon.com Cc: daniel.gruss@iaik.tugraz.at Cc: hughd@google.com Cc: keescook@google.com Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Waiman Long <llong@redhat.com> Cc: "David H . Gutteridge" <dhgutteridge@sympatico.ca> Cc: joro@8bytes.org Link: https://lkml.kernel.org/r/1531906876-13451-34-git-send-email-joro@8bytes.org
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@ -50,13 +50,16 @@ extern bool __vmalloc_start_set; /* set once high_memory is set */
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((FIXADDR_TOT_START - PAGE_SIZE * (CPU_ENTRY_AREA_PAGES + 1)) \
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& PMD_MASK)
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#define PKMAP_BASE \
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#define LDT_BASE_ADDR \
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((CPU_ENTRY_AREA_BASE - PAGE_SIZE) & PMD_MASK)
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#define PKMAP_BASE \
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((LDT_BASE_ADDR - PAGE_SIZE) & PMD_MASK)
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#ifdef CONFIG_HIGHMEM
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# define VMALLOC_END (PKMAP_BASE - 2 * PAGE_SIZE)
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#else
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# define VMALLOC_END (CPU_ENTRY_AREA_BASE - 2 * PAGE_SIZE)
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# define VMALLOC_END (LDT_BASE_ADDR - 2 * PAGE_SIZE)
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#endif
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#define MODULES_VADDR VMALLOC_START
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@ -122,6 +122,9 @@ enum address_markers_idx {
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VMALLOC_END_NR,
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#ifdef CONFIG_HIGHMEM
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PKMAP_BASE_NR,
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#endif
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#ifdef CONFIG_MODIFY_LDT_SYSCALL
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LDT_NR,
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#endif
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CPU_ENTRY_AREA_NR,
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FIXADDR_START_NR,
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@ -135,6 +138,9 @@ static struct addr_marker address_markers[] = {
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[VMALLOC_END_NR] = { 0UL, "vmalloc() End" },
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#ifdef CONFIG_HIGHMEM
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[PKMAP_BASE_NR] = { 0UL, "Persistent kmap() Area" },
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#endif
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#ifdef CONFIG_MODIFY_LDT_SYSCALL
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[LDT_NR] = { 0UL, "LDT remap" },
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#endif
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[CPU_ENTRY_AREA_NR] = { 0UL, "CPU entry area" },
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[FIXADDR_START_NR] = { 0UL, "Fixmap area" },
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@ -609,6 +615,9 @@ static int __init pt_dump_init(void)
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# endif
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address_markers[FIXADDR_START_NR].start_address = FIXADDR_START;
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address_markers[CPU_ENTRY_AREA_NR].start_address = CPU_ENTRY_AREA_BASE;
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# ifdef CONFIG_MODIFY_LDT_SYSCALL
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address_markers[LDT_NR].start_address = LDT_BASE_ADDR;
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# endif
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#endif
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return 0;
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}
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