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Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/ldt_32.c60
-rw-r--r--arch/x86/kernel/ldt_64.c69
2 files changed, 69 insertions, 60 deletions
diff --git a/arch/x86/kernel/ldt_32.c b/arch/x86/kernel/ldt_32.c
index 9ff90a27c45..e366c5fd0d1 100644
--- a/arch/x86/kernel/ldt_32.c
+++ b/arch/x86/kernel/ldt_32.c
@@ -17,7 +17,7 @@
#include <asm/desc.h>
#include <asm/mmu_context.h>
-#ifdef CONFIG_SMP /* avoids "defined but not used" warnig */
+#ifdef CONFIG_SMP
static void flush_ldt(void *null)
{
if (current->active_mm)
@@ -34,19 +34,20 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
if (mincount <= pc->size)
return 0;
oldsize = pc->size;
- mincount = (mincount+511)&(~511);
- if (mincount*LDT_ENTRY_SIZE > PAGE_SIZE)
- newldt = vmalloc(mincount*LDT_ENTRY_SIZE);
+ mincount = (mincount + 511) & (~511);
+ if (mincount * LDT_ENTRY_SIZE > PAGE_SIZE)
+ newldt = vmalloc(mincount * LDT_ENTRY_SIZE);
else
- newldt = kmalloc(mincount*LDT_ENTRY_SIZE, GFP_KERNEL);
+ newldt = kmalloc(mincount * LDT_ENTRY_SIZE, GFP_KERNEL);
if (!newldt)
return -ENOMEM;
if (oldsize)
- memcpy(newldt, pc->ldt, oldsize*LDT_ENTRY_SIZE);
+ memcpy(newldt, pc->ldt, oldsize * LDT_ENTRY_SIZE);
oldldt = pc->ldt;
- memset(newldt+oldsize*LDT_ENTRY_SIZE, 0, (mincount-oldsize)*LDT_ENTRY_SIZE);
+ memset(newldt + oldsize * LDT_ENTRY_SIZE, 0,
+ (mincount - oldsize) * LDT_ENTRY_SIZE);
pc->ldt = newldt;
wmb();
pc->size = mincount;
@@ -55,6 +56,7 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
if (reload) {
#ifdef CONFIG_SMP
cpumask_t mask;
+
preempt_disable();
load_LDT(pc);
mask = cpumask_of_cpu(smp_processor_id());
@@ -66,7 +68,7 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
#endif
}
if (oldsize) {
- if (oldsize*LDT_ENTRY_SIZE > PAGE_SIZE)
+ if (oldsize * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(oldldt);
else
kfree(oldldt);
@@ -77,9 +79,10 @@ static int alloc_ldt(mm_context_t *pc, int mincount, int reload)
static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
{
int err = alloc_ldt(new, old->size, 0);
+
if (err < 0)
return err;
- memcpy(new->ldt, old->ldt, old->size*LDT_ENTRY_SIZE);
+ memcpy(new->ldt, old->ldt, old->size * LDT_ENTRY_SIZE);
return 0;
}
@@ -89,7 +92,7 @@ static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
*/
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
- struct mm_struct * old_mm;
+ struct mm_struct *old_mm;
int retval = 0;
mutex_init(&mm->context.lock);
@@ -111,7 +114,7 @@ void destroy_context(struct mm_struct *mm)
if (mm->context.size) {
if (mm == current->active_mm)
clear_LDT();
- if (mm->context.size*LDT_ENTRY_SIZE > PAGE_SIZE)
+ if (mm->context.size * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(mm->context.ldt);
else
kfree(mm->context.ldt);
@@ -119,19 +122,19 @@ void destroy_context(struct mm_struct *mm)
}
}
-static int read_ldt(void __user * ptr, unsigned long bytecount)
+static int read_ldt(void __user *ptr, unsigned long bytecount)
{
int err;
unsigned long size;
- struct mm_struct * mm = current->mm;
+ struct mm_struct *mm = current->mm;
if (!mm->context.size)
return 0;
- if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
- bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
+ if (bytecount > LDT_ENTRY_SIZE * LDT_ENTRIES)
+ bytecount = LDT_ENTRY_SIZE * LDT_ENTRIES;
mutex_lock(&mm->context.lock);
- size = mm->context.size*LDT_ENTRY_SIZE;
+ size = mm->context.size * LDT_ENTRY_SIZE;
if (size > bytecount)
size = bytecount;
@@ -143,7 +146,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
goto error_return;
if (size != bytecount) {
/* zero-fill the rest */
- if (clear_user(ptr+size, bytecount-size) != 0) {
+ if (clear_user(ptr + size, bytecount - size) != 0) {
err = -EFAULT;
goto error_return;
}
@@ -153,13 +156,13 @@ error_return:
return err;
}
-static int read_default_ldt(void __user * ptr, unsigned long bytecount)
+static int read_default_ldt(void __user *ptr, unsigned long bytecount)
{
int err;
unsigned long size;
err = 0;
- size = 5*sizeof(struct desc_struct);
+ size = 5 * sizeof(struct desc_struct);
if (size > bytecount)
size = bytecount;
@@ -170,9 +173,9 @@ static int read_default_ldt(void __user * ptr, unsigned long bytecount)
return err;
}
-static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
+static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
{
- struct mm_struct * mm = current->mm;
+ struct mm_struct *mm = current->mm;
__u32 entry_1, entry_2;
int error;
struct user_desc ldt_info;
@@ -180,7 +183,7 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
error = -EINVAL;
if (bytecount != sizeof(ldt_info))
goto out;
- error = -EFAULT;
+ error = -EFAULT;
if (copy_from_user(&ldt_info, ptr, sizeof(ldt_info)))
goto out;
@@ -196,13 +199,14 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
mutex_lock(&mm->context.lock);
if (ldt_info.entry_number >= mm->context.size) {
- error = alloc_ldt(&current->mm->context, ldt_info.entry_number+1, 1);
+ error = alloc_ldt(&current->mm->context,
+ ldt_info.entry_number + 1, 1);
if (error < 0)
goto out_unlock;
}
- /* Allow LDTs to be cleared by the user. */
- if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
+ /* Allow LDTs to be cleared by the user. */
+ if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
if (oldmode || LDT_empty(&ldt_info)) {
entry_1 = 0;
entry_2 = 0;
@@ -217,7 +221,8 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
/* Install the new entry ... */
install:
- write_ldt_entry(mm->context.ldt, ldt_info.entry_number, entry_1, entry_2);
+ write_ldt_entry(mm->context.ldt, ldt_info.entry_number, entry_1,
+ entry_2);
error = 0;
out_unlock:
@@ -226,7 +231,8 @@ out:
return error;
}
-asmlinkage int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
+asmlinkage int sys_modify_ldt(int func, void __user *ptr,
+ unsigned long bytecount)
{
int ret = -ENOSYS;
diff --git a/arch/x86/kernel/ldt_64.c b/arch/x86/kernel/ldt_64.c
index 60e57abb8e9..6c41db367de 100644
--- a/arch/x86/kernel/ldt_64.c
+++ b/arch/x86/kernel/ldt_64.c
@@ -2,7 +2,7 @@
* Copyright (C) 1992 Krishna Balasubramanian and Linus Torvalds
* Copyright (C) 1999 Ingo Molnar <mingo@redhat.com>
* Copyright (C) 2002 Andi Kleen
- *
+ *
* This handles calls from both 32bit and 64bit mode.
*/
@@ -20,11 +20,11 @@
#include <asm/desc.h>
#include <asm/proto.h>
-#ifdef CONFIG_SMP /* avoids "defined but not used" warnig */
+#ifdef CONFIG_SMP
static void flush_ldt(void *null)
{
if (current->active_mm)
- load_LDT(&current->active_mm->context);
+ load_LDT(&current->active_mm->context);
}
#endif
@@ -37,19 +37,20 @@ static int alloc_ldt(mm_context_t *pc, unsigned mincount, int reload)
if (mincount <= (unsigned)pc->size)
return 0;
oldsize = pc->size;
- mincount = (mincount+511)&(~511);
- if (mincount*LDT_ENTRY_SIZE > PAGE_SIZE)
- newldt = vmalloc(mincount*LDT_ENTRY_SIZE);
+ mincount = (mincount + 511) & (~511);
+ if (mincount * LDT_ENTRY_SIZE > PAGE_SIZE)
+ newldt = vmalloc(mincount * LDT_ENTRY_SIZE);
else
- newldt = kmalloc(mincount*LDT_ENTRY_SIZE, GFP_KERNEL);
+ newldt = kmalloc(mincount * LDT_ENTRY_SIZE, GFP_KERNEL);
if (!newldt)
return -ENOMEM;
if (oldsize)
- memcpy(newldt, pc->ldt, oldsize*LDT_ENTRY_SIZE);
+ memcpy(newldt, pc->ldt, oldsize * LDT_ENTRY_SIZE);
oldldt = pc->ldt;
- memset(newldt+oldsize*LDT_ENTRY_SIZE, 0, (mincount-oldsize)*LDT_ENTRY_SIZE);
+ memset(newldt + oldsize * LDT_ENTRY_SIZE, 0,
+ (mincount - oldsize) * LDT_ENTRY_SIZE);
wmb();
pc->ldt = newldt;
wmb();
@@ -70,7 +71,7 @@ static int alloc_ldt(mm_context_t *pc, unsigned mincount, int reload)
#endif
}
if (oldsize) {
- if (oldsize*LDT_ENTRY_SIZE > PAGE_SIZE)
+ if (oldsize * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(oldldt);
else
kfree(oldldt);
@@ -81,9 +82,10 @@ static int alloc_ldt(mm_context_t *pc, unsigned mincount, int reload)
static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
{
int err = alloc_ldt(new, old->size, 0);
+
if (err < 0)
return err;
- memcpy(new->ldt, old->ldt, old->size*LDT_ENTRY_SIZE);
+ memcpy(new->ldt, old->ldt, old->size * LDT_ENTRY_SIZE);
return 0;
}
@@ -93,7 +95,7 @@ static inline int copy_ldt(mm_context_t *new, mm_context_t *old)
*/
int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
{
- struct mm_struct * old_mm;
+ struct mm_struct *old_mm;
int retval = 0;
mutex_init(&mm->context.lock);
@@ -108,13 +110,12 @@ int init_new_context(struct task_struct *tsk, struct mm_struct *mm)
}
/*
- *
* Don't touch the LDT register - we're already in the next thread.
*/
void destroy_context(struct mm_struct *mm)
{
if (mm->context.size) {
- if ((unsigned)mm->context.size*LDT_ENTRY_SIZE > PAGE_SIZE)
+ if ((unsigned)mm->context.size * LDT_ENTRY_SIZE > PAGE_SIZE)
vfree(mm->context.ldt);
else
kfree(mm->context.ldt);
@@ -122,19 +123,19 @@ void destroy_context(struct mm_struct *mm)
}
}
-static int read_ldt(void __user * ptr, unsigned long bytecount)
+static int read_ldt(void __user *ptr, unsigned long bytecount)
{
int err;
unsigned long size;
- struct mm_struct * mm = current->mm;
+ struct mm_struct *mm = current->mm;
if (!mm->context.size)
return 0;
- if (bytecount > LDT_ENTRY_SIZE*LDT_ENTRIES)
- bytecount = LDT_ENTRY_SIZE*LDT_ENTRIES;
+ if (bytecount > LDT_ENTRY_SIZE * LDT_ENTRIES)
+ bytecount = LDT_ENTRY_SIZE * LDT_ENTRIES;
mutex_lock(&mm->context.lock);
- size = mm->context.size*LDT_ENTRY_SIZE;
+ size = mm->context.size * LDT_ENTRY_SIZE;
if (size > bytecount)
size = bytecount;
@@ -146,7 +147,7 @@ static int read_ldt(void __user * ptr, unsigned long bytecount)
goto error_return;
if (size != bytecount) {
/* zero-fill the rest */
- if (clear_user(ptr+size, bytecount-size) != 0) {
+ if (clear_user(ptr + size, bytecount - size) != 0) {
err = -EFAULT;
goto error_return;
}
@@ -156,21 +157,21 @@ error_return:
return err;
}
-static int read_default_ldt(void __user * ptr, unsigned long bytecount)
+static int read_default_ldt(void __user *ptr, unsigned long bytecount)
{
- /* Arbitrary number */
+ /* Arbitrary number */
/* x86-64 default LDT is all zeros */
- if (bytecount > 128)
- bytecount = 128;
+ if (bytecount > 128)
+ bytecount = 128;
if (clear_user(ptr, bytecount))
return -EFAULT;
- return bytecount;
+ return bytecount;
}
-static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
+static int write_ldt(void __user *ptr, unsigned long bytecount, int oldmode)
{
struct task_struct *me = current;
- struct mm_struct * mm = me->mm;
+ struct mm_struct *mm = me->mm;
__u32 entry_1, entry_2, *lp;
int error;
struct user_desc ldt_info;
@@ -179,7 +180,7 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
if (bytecount != sizeof(ldt_info))
goto out;
- error = -EFAULT;
+ error = -EFAULT;
if (copy_from_user(&ldt_info, ptr, bytecount))
goto out;
@@ -195,15 +196,16 @@ static int write_ldt(void __user * ptr, unsigned long bytecount, int oldmode)
mutex_lock(&mm->context.lock);
if (ldt_info.entry_number >= (unsigned)mm->context.size) {
- error = alloc_ldt(&current->mm->context, ldt_info.entry_number+1, 1);
+ error = alloc_ldt(&current->mm->context,
+ ldt_info.entry_number + 1, 1);
if (error < 0)
goto out_unlock;
}
- lp = (__u32 *) ((ldt_info.entry_number << 3) + (char *) mm->context.ldt);
+ lp = (__u32 *)((ldt_info.entry_number << 3) + (char *)mm->context.ldt);
- /* Allow LDTs to be cleared by the user. */
- if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
+ /* Allow LDTs to be cleared by the user. */
+ if (ldt_info.base_addr == 0 && ldt_info.limit == 0) {
if (oldmode || LDT_empty(&ldt_info)) {
entry_1 = 0;
entry_2 = 0;
@@ -228,7 +230,8 @@ out:
return error;
}
-asmlinkage int sys_modify_ldt(int func, void __user *ptr, unsigned long bytecount)
+asmlinkage int sys_modify_ldt(int func, void __user *ptr,
+ unsigned long bytecount)
{
int ret = -ENOSYS;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-10-30 19:33:01 +0000