diff options
Diffstat (limited to 'arch/x86')
-rw-r--r-- | arch/x86/kernel/ldt_32.c | 60 | ||||
-rw-r--r-- | arch/x86/kernel/ldt_64.c | 69 |
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(¤t->mm->context, ldt_info.entry_number+1, 1); + error = alloc_ldt(¤t->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(¤t->active_mm->context); + load_LDT(¤t->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(¤t->mm->context, ldt_info.entry_number+1, 1); + error = alloc_ldt(¤t->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; |