9 files changed, 10 insertions, 477 deletions

diff --git a/arch/um/include/asm/mmu.h b/arch/um/include/asm/mmu.h
index f2923c767bb9..6e433098d8c3 100644
--- a/arch/um/include/asm/mmu.h
+++ b/arch/um/include/asm/mmu.h
@@ -7,15 +7,9 @@
 #define __ARCH_UM_MMU_H
 
 #include <mm_id.h>
-#include <asm/mm_context.h>
 
 typedef struct mm_context {
 	struct mm_id id;
-	struct uml_arch_mm_context arch;
 } mm_context_t;
 
-/* Avoid tangled inclusion with asm/ldt.h */
-extern long init_new_ldt(struct mm_context *to_mm, struct mm_context *from_mm);
-extern void free_ldt(struct mm_context *mm);
-
 #endif
diff --git a/arch/um/include/shared/skas/stub-data.h b/arch/um/include/shared/skas/stub-data.h
index 6ffa9fb5218c..6b8caf6b8283 100644
--- a/arch/um/include/shared/skas/stub-data.h
+++ b/arch/um/include/shared/skas/stub-data.h
@@ -20,23 +20,16 @@ enum stub_syscall_type {
 	STUB_SYSCALL_MMAP,
 	STUB_SYSCALL_MUNMAP,
 	STUB_SYSCALL_MPROTECT,
-	STUB_SYSCALL_LDT,
 };
 
 struct stub_syscall {
-	union {
-		struct {
-			unsigned long addr;
-			unsigned long length;
-			unsigned long offset;
-			int fd;
-			int prot;
-		} mem;
-		struct {
-			user_desc_t desc;
-			int func;
-		} ldt;
-	};
+	struct {
+		unsigned long addr;
+		unsigned long length;
+		unsigned long offset;
+		int fd;
+		int prot;
+	} mem;
 
 	enum stub_syscall_type syscall;
 };
diff --git a/arch/um/kernel/skas/mmu.c b/arch/um/kernel/skas/mmu.c
index 681839cdd795..968e254cf709 100644
--- a/arch/um/kernel/skas/mmu.c
+++ b/arch/um/kernel/skas/mmu.c
@@ -46,13 +46,6 @@ int init_new_context(struct task_struct *task, struct mm_struct *mm)
 		goto out_free;
 	}
 
-	ret = init_new_ldt(to_mm, from_mm);
-	if (ret < 0) {
-		printk(KERN_ERR "init_new_context_skas - init_ldt"
-		       " failed, errno = %d\n", ret);
-		goto out_free;
-	}
-
 	return 0;
 
  out_free:
@@ -80,5 +73,4 @@ void destroy_context(struct mm_struct *mm)
 	os_kill_ptraced_process(mmu->id.u.pid, 1);
 
 	free_pages(mmu->id.stack, ilog2(STUB_DATA_PAGES));
-	free_ldt(mmu);
 }
diff --git a/arch/um/kernel/skas/stub.c b/arch/um/kernel/skas/stub.c
index 8773529b5048..5d52ffa682dc 100644
--- a/arch/um/kernel/skas/stub.c
+++ b/arch/um/kernel/skas/stub.c
@@ -45,17 +45,6 @@ static __always_inline int syscall_handler(struct stub_data *d)
 				return -1;
 			}
 			break;
-		case STUB_SYSCALL_LDT:
-			res = stub_syscall3(__NR_modify_ldt, sc->ldt.func,
-					    (unsigned long) &sc->ldt.desc,
-					    sizeof(sc->ldt.desc));
-			/* We only write, so the expected result is zero */
-			if (res) {
-				d->err = res;
-				d->syscall_data_len = i;
-				return -1;
-			}
-			break;
 		default:
 			d->err = -95; /* EOPNOTSUPP */
 			d->syscall_data_len = i;
diff --git a/arch/um/os-Linux/start_up.c b/arch/um/os-Linux/start_up.c
index 89ad9f4f865c..93fc82c01aba 100644
--- a/arch/um/os-Linux/start_up.c
+++ b/arch/um/os-Linux/start_up.c
@@ -17,6 +17,7 @@
 #include <sys/wait.h>
 #include <sys/time.h>
 #include <sys/resource.h>
+#include <asm/ldt.h>
 #include <asm/unistd.h>
 #include <init.h>
 #include <os.h>
diff --git a/arch/x86/um/Makefile b/arch/x86/um/Makefile
index 4559d2a693c4..17b85209c43d 100644
--- a/arch/x86/um/Makefile
+++ b/arch/x86/um/Makefile
@@ -9,7 +9,7 @@ else
 	BITS := 64
 endif
 
-obj-y = bugs_$(BITS).o delay.o fault.o ldt.o \
+obj-y = bugs_$(BITS).o delay.o fault.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 \
diff --git a/arch/x86/um/asm/mm_context.h b/arch/x86/um/asm/mm_context.h
deleted file mode 100644
index dc32dc023c2f..000000000000
--- a/arch/x86/um/asm/mm_context.h
+++ /dev/null
@@ -1,70 +0,0 @@
-/*
- * Copyright (C) 2004 Fujitsu Siemens Computers GmbH
- * Licensed under the GPL
- *
- * Author: Bodo Stroesser <bstroesser@fujitsu-siemens.com>
- */
-
-#ifndef __ASM_LDT_H
-#define __ASM_LDT_H
-
-#include <linux/mutex.h>
-#include <asm/ldt.h>
-
-#define LDT_PAGES_MAX \
-	((LDT_ENTRIES * LDT_ENTRY_SIZE)/PAGE_SIZE)
-#define LDT_ENTRIES_PER_PAGE \
-	(PAGE_SIZE/LDT_ENTRY_SIZE)
-#define LDT_DIRECT_ENTRIES \
-	((LDT_PAGES_MAX*sizeof(void *))/LDT_ENTRY_SIZE)
-
-struct ldt_entry {
-	__u32 a;
-	__u32 b;
-};
-
-typedef struct uml_ldt {
-	int entry_count;
-	struct mutex lock;
-	union {
-		struct ldt_entry * pages[LDT_PAGES_MAX];
-		struct ldt_entry entries[LDT_DIRECT_ENTRIES];
-	} u;
-} uml_ldt_t;
-
-#define LDT_entry_a(info) \
-	((((info)->base_addr & 0x0000ffff) << 16) | ((info)->limit & 0x0ffff))
-
-#define LDT_entry_b(info) \
-	(((info)->base_addr & 0xff000000) | \
-	(((info)->base_addr & 0x00ff0000) >> 16) | \
-	((info)->limit & 0xf0000) | \
-	(((info)->read_exec_only ^ 1) << 9) | \
-	((info)->contents << 10) | \
-	(((info)->seg_not_present ^ 1) << 15) | \
-	((info)->seg_32bit << 22) | \
-	((info)->limit_in_pages << 23) | \
-	((info)->useable << 20) | \
-	0x7000)
-
-#define _LDT_empty(info) (\
-	(info)->base_addr	== 0	&& \
-	(info)->limit		== 0	&& \
-	(info)->contents	== 0	&& \
-	(info)->read_exec_only	== 1	&& \
-	(info)->seg_32bit	== 0	&& \
-	(info)->limit_in_pages	== 0	&& \
-	(info)->seg_not_present	== 1	&& \
-	(info)->useable		== 0	)
-
-#ifdef CONFIG_X86_64
-#define LDT_empty(info) (_LDT_empty(info) && ((info)->lm == 0))
-#else
-#define LDT_empty(info) (_LDT_empty(info))
-#endif
-
-struct uml_arch_mm_context {
-	uml_ldt_t ldt;
-};
-
-#endif
diff --git a/arch/x86/um/ldt.c b/arch/x86/um/ldt.c
deleted file mode 100644
index c99fc23b1290..000000000000
--- a/arch/x86/um/ldt.c
+++ /dev/null
@@ -1,367 +0,0 @@
-/*
- * Copyright (C) 2001 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
- * Licensed under the GPL
- */
-
-#include <linux/mm.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/syscalls.h>
-#include <linux/uaccess.h>
-#include <asm/unistd.h>
-#include <os.h>
-#include <skas.h>
-#include <sysdep/tls.h>
-#include <stub-data.h>
-
-static inline int modify_ldt (int func, void *ptr, unsigned long bytecount)
-{
-	return syscall(__NR_modify_ldt, func, ptr, bytecount);
-}
-
-static void write_ldt_entry(struct mm_id *mm_idp, int func,
-		     struct user_desc *desc)
-{
-	struct stub_syscall *sc;
-
-	sc = syscall_stub_alloc(mm_idp);
-	sc->syscall = STUB_SYSCALL_LDT;
-	sc->ldt.func = func;
-	memcpy(&sc->ldt.desc, desc, sizeof(*desc));
-}
-
-/*
- * In skas mode, we hold our own ldt data in UML.
- * Thus, the code implementing sys_modify_ldt_skas
- * is very similar to (and mostly stolen from) sys_modify_ldt
- * for arch/i386/kernel/ldt.c
- * The routines copied and modified in part are:
- * - read_ldt
- * - read_default_ldt
- * - write_ldt
- * - sys_modify_ldt_skas
- */
-
-static int read_ldt(void __user * ptr, unsigned long bytecount)
-{
-	int i, err = 0;
-	unsigned long size;
-	uml_ldt_t *ldt = &current->mm->context.arch.ldt;
-
-	if (!ldt->entry_count)
-		goto out;
-	if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
-		bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
-	err = bytecount;
-
-	mutex_lock(&ldt->lock);
-	if (ldt->entry_count <= LDT_DIRECT_ENTRIES) {
-		size = LDT_ENTRY_SIZE*LDT_DIRECT_ENTRIES;
-		if (size > bytecount)
-			size = bytecount;
-		if (copy_to_user(ptr, ldt->u.entries, size))
-			err = -EFAULT;
-		bytecount -= size;
-		ptr += size;
-	}
-	else {
-		for (i=0; i<ldt->entry_count/LDT_ENTRIES_PER_PAGE && bytecount;
-		     i++) {
-			size = PAGE_SIZE;
-			if (size > bytecount)
-				size = bytecount;
-			if (copy_to_user(ptr, ldt->u.pages[i], size)) {
-				err = -EFAULT;
-				break;
-			}
-			bytecount -= size;
-			ptr += size;
-		}
-	}
-	mutex_unlock(&ldt->lock);
-
-	if (bytecount == 0 || err == -EFAULT)
-		goto out;
-
-	if (clear_user(ptr, bytecount))
-		err = -EFAULT;
-
-out:
-	return err;
-}
-
-static int read_default_ldt(void __user * ptr, unsigned long bytecount)
-{
-	int err;
-
-	if (bytecount > 5*LDT_ENTRY_SIZE)
-		bytecount = 5*LDT_ENTRY_SIZE;
-
-	err = bytecount;
-	/*
-	 * UML doesn't support lcall7 and lcall27.
-	 * So, we don't really have a default ldt, but emulate
-	 * an empty ldt of common host default ldt size.
-	 */
-	if (clear_user(ptr, bytecount))
-		err = -EFAULT;
-
-	return err;
-}
-
-static int write_ldt(void __user * ptr, unsigned long bytecount, int func)
-{
-	uml_ldt_t *ldt = &current->mm->context.arch.ldt;
-	struct mm_id * mm_idp = &current->mm->context.id;
-	int i, err;
-	struct user_desc ldt_info;
-	struct ldt_entry entry0, *ldt_p;
-
-	err = -EINVAL;
-	if (bytecount != sizeof(ldt_info))
-		goto out;
-	err = -EFAULT;
-	if (copy_from_user(&ldt_info, ptr, sizeof(ldt_info)))
-		goto out;
-
-	err = -EINVAL;
-	if (ldt_info.entry_number >= LDT_ENTRIES)
-		goto out;
-	if (ldt_info.contents == 3) {
-		if (func == 1)
-			goto out;
-		if (ldt_info.seg_not_present == 0)
-			goto out;
-	}
-
-	mutex_lock(&ldt->lock);
-
-	write_ldt_entry(mm_idp, func, &ldt_info);
-	err = syscall_stub_flush(mm_idp);
-	if (err)
-		goto out_unlock;
-
-	if (ldt_info.entry_number >= ldt->entry_count &&
-	    ldt_info.entry_number >= LDT_DIRECT_ENTRIES) {
-		for (i=ldt->entry_count/LDT_ENTRIES_PER_PAGE;
-		     i*LDT_ENTRIES_PER_PAGE <= ldt_info.entry_number;
-		     i++) {
-			if (i == 0)
-				memcpy(&entry0, ldt->u.entries,
-				       sizeof(entry0));
-			ldt->u.pages[i] = (struct ldt_entry *)
-				__get_free_page(GFP_KERNEL|__GFP_ZERO);
-			if (!ldt->u.pages[i]) {
-				err = -ENOMEM;
-				/* Undo the change in host */
-				memset(&ldt_info, 0, sizeof(ldt_info));
-				write_ldt_entry(mm_idp, 1, &ldt_info);
-				err = syscall_stub_flush(mm_idp);
-				goto out_unlock;
-			}
-			if (i == 0) {
-				memcpy(ldt->u.pages[0], &entry0,
-				       sizeof(entry0));
-				memcpy(ldt->u.pages[0]+1, ldt->u.entries+1,
-				       sizeof(entry0)*(LDT_DIRECT_ENTRIES-1));
-			}
-			ldt->entry_count = (i + 1) * LDT_ENTRIES_PER_PAGE;
-		}
-	}
-	if (ldt->entry_count <= ldt_info.entry_number)
-		ldt->entry_count = ldt_info.entry_number + 1;
-
-	if (ldt->entry_count <= LDT_DIRECT_ENTRIES)
-		ldt_p = ldt->u.entries + ldt_info.entry_number;
-	else
-		ldt_p = ldt->u.pages[ldt_info.entry_number/LDT_ENTRIES_PER_PAGE] +
-			ldt_info.entry_number%LDT_ENTRIES_PER_PAGE;
-
-	if (ldt_info.base_addr == 0 && ldt_info.limit == 0 &&
-	   (func == 1 || LDT_empty(&ldt_info))) {
-		ldt_p->a = 0;
-		ldt_p->b = 0;
-	}
-	else{
-		if (func == 1)
-			ldt_info.useable = 0;
-		ldt_p->a = LDT_entry_a(&ldt_info);
-		ldt_p->b = LDT_entry_b(&ldt_info);
-	}
-	err = 0;
-
-out_unlock:
-	mutex_unlock(&ldt->lock);
-out:
-	return err;
-}
-
-static long do_modify_ldt_skas(int func, void __user *ptr,
-			       unsigned long bytecount)
-{
-	int ret = -ENOSYS;
-
-	switch (func) {
-		case 0:
-			ret = read_ldt(ptr, bytecount);
-			break;
-		case 1:
-		case 0x11:
-			ret = write_ldt(ptr, bytecount, func);
-			break;
-		case 2:
-			ret = read_default_ldt(ptr, bytecount);
-			break;
-	}
-	return ret;
-}
-
-static DEFINE_SPINLOCK(host_ldt_lock);
-static short dummy_list[9] = {0, -1};
-static short * host_ldt_entries = NULL;
-
-static void ldt_get_host_info(void)
-{
-	long ret;
-	struct ldt_entry * ldt;
-	short *tmp;
-	int i, size, k, order;
-
-	spin_lock(&host_ldt_lock);
-
-	if (host_ldt_entries != NULL) {
-		spin_unlock(&host_ldt_lock);
-		return;
-	}
-	host_ldt_entries = dummy_list+1;
-
-	spin_unlock(&host_ldt_lock);
-
-	for (i = LDT_PAGES_MAX-1, order=0; i; i>>=1, order++)
-		;
-
-	ldt = (struct ldt_entry *)
-	      __get_free_pages(GFP_KERNEL|__GFP_ZERO, order);
-	if (ldt == NULL) {
-		printk(KERN_ERR "ldt_get_host_info: couldn't allocate buffer "
-		       "for host ldt\n");
-		return;
-	}
-
-	ret = modify_ldt(0, ldt, (1<<order)*PAGE_SIZE);
-	if (ret < 0) {
-		printk(KERN_ERR "ldt_get_host_info: couldn't read host ldt\n");
-		goto out_free;
-	}
-	if (ret == 0) {
-		/* default_ldt is active, simply write an empty entry 0 */
-		host_ldt_entries = dummy_list;
-		goto out_free;
-	}
-
-	for (i=0, size=0; i<ret/LDT_ENTRY_SIZE; i++) {
-		if (ldt[i].a != 0 || ldt[i].b != 0)
-			size++;
-	}
-
-	if (size < ARRAY_SIZE(dummy_list))
-		host_ldt_entries = dummy_list;
-	else {
-		size = (size + 1) * sizeof(dummy_list[0]);
-		tmp = kmalloc(size, GFP_KERNEL);
-		if (tmp == NULL) {
-			printk(KERN_ERR "ldt_get_host_info: couldn't allocate "
-			       "host ldt list\n");
-			goto out_free;
-		}
-		host_ldt_entries = tmp;
-	}
-
-	for (i=0, k=0; i<ret/LDT_ENTRY_SIZE; i++) {
-		if (ldt[i].a != 0 || ldt[i].b != 0)
-			host_ldt_entries[k++] = i;
-	}
-	host_ldt_entries[k] = -1;
-
-out_free:
-	free_pages((unsigned long)ldt, order);
-}
-
-long init_new_ldt(struct mm_context *new_mm, struct mm_context *from_mm)
-{
-	struct user_desc desc;
-	short * num_p;
-	int i;
-	long page, err=0;
-
-
-	mutex_init(&new_mm->arch.ldt.lock);
-
-	if (!from_mm) {
-		memset(&desc, 0, sizeof(desc));
-		/*
-		 * Now we try to retrieve info about the ldt, we
-		 * inherited from the host. All ldt-entries found
-		 * will be reset in the following loop
-		 */
-		ldt_get_host_info();
-		for (num_p=host_ldt_entries; *num_p != -1; num_p++) {
-			desc.entry_number = *num_p;
-			write_ldt_entry(&new_mm->id, 1, &desc);
-		}
-		err = syscall_stub_flush(&new_mm->id);
-		new_mm->arch.ldt.entry_count = 0;
-
-		goto out;
-	}
-
-	/*
-	 * Our local LDT is used to supply the data for
-	 * modify_ldt(READLDT), if PTRACE_LDT isn't available,
-	 * i.e., we have to use the stub for modify_ldt, which
-	 * can't handle the big read buffer of up to 64kB.
-	 */
-	mutex_lock(&from_mm->arch.ldt.lock);
-	if (from_mm->arch.ldt.entry_count <= LDT_DIRECT_ENTRIES)
-		memcpy(new_mm->arch.ldt.u.entries, from_mm->arch.ldt.u.entries,
-		       sizeof(new_mm->arch.ldt.u.entries));
-	else {
-		i = from_mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
-		while (i-->0) {
-			page = __get_free_page(GFP_KERNEL|__GFP_ZERO);
-			if (!page) {
-				err = -ENOMEM;
-				break;
-			}
-			new_mm->arch.ldt.u.pages[i] =
-				(struct ldt_entry *) page;
-			memcpy(new_mm->arch.ldt.u.pages[i],
-			       from_mm->arch.ldt.u.pages[i], PAGE_SIZE);
-		}
-	}
-	new_mm->arch.ldt.entry_count = from_mm->arch.ldt.entry_count;
-	mutex_unlock(&from_mm->arch.ldt.lock);
-
-    out:
-	return err;
-}
-
-
-void free_ldt(struct mm_context *mm)
-{
-	int i;
-
-	if (mm->arch.ldt.entry_count > LDT_DIRECT_ENTRIES) {
-		i = mm->arch.ldt.entry_count / LDT_ENTRIES_PER_PAGE;
-		while (i-- > 0)
-			free_page((long) mm->arch.ldt.u.pages[i]);
-	}
-	mm->arch.ldt.entry_count = 0;
-}
-
-SYSCALL_DEFINE3(modify_ldt, int , func , void __user * , ptr ,
-		unsigned long , bytecount)
-{
-	/* See non-um modify_ldt() for why we do this cast */
-	return (unsigned int)do_modify_ldt_skas(func, ptr, bytecount);
-}
diff --git a/arch/x86/um/tls_32.c b/arch/x86/um/tls_32.c
index d301deee041f..fbb129023080 100644
--- a/arch/x86/um/tls_32.c
+++ b/arch/x86/um/tls_32.c
@@ -11,6 +11,7 @@
 #include <os.h>
 #include <skas.h>
 #include <sysdep/tls.h>
+#include <asm/desc.h>
 
 /*
  * If needed we can detect when it's uninitialized.