* Copyright (C) 1994 Linus Torvalds
*
* 29 dec 2001 - Fixed oopses caused by unchecked access to the vm86
- * stack - Manfred Spraul <manfreds@colorfullife.com>
+ * stack - Manfred Spraul <manfred@colorfullife.com>
*
* 22 mar 2002 - Manfred detected the stackfaults, but didn't handle
* them correctly. Now the emulation will be in a
*
*/
-#include <linux/config.h>
+#include <linux/capability.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/smp_lock.h>
#include <linux/highmem.h>
#include <linux/ptrace.h>
+#include <linux/audit.h>
+#include <linux/stddef.h>
#include <asm/uaccess.h>
#include <asm/io.h>
/*
* 8- and 16-bit register defines..
*/
-#define AL(regs) (((unsigned char *)&((regs)->eax))[0])
-#define AH(regs) (((unsigned char *)&((regs)->eax))[1])
-#define IP(regs) (*(unsigned short *)&((regs)->eip))
-#define SP(regs) (*(unsigned short *)&((regs)->esp))
+#define AL(regs) (((unsigned char *)&((regs)->pt.eax))[0])
+#define AH(regs) (((unsigned char *)&((regs)->pt.eax))[1])
+#define IP(regs) (*(unsigned short *)&((regs)->pt.eip))
+#define SP(regs) (*(unsigned short *)&((regs)->pt.esp))
/*
* virtual flags (16 and 32-bit versions)
#define SAFE_MASK (0xDD5)
#define RETURN_MASK (0xDFF)
-#define VM86_REGS_PART2 orig_eax
-#define VM86_REGS_SIZE1 \
- ( (unsigned)( & (((struct kernel_vm86_regs *)0)->VM86_REGS_PART2) ) )
-#define VM86_REGS_SIZE2 (sizeof(struct kernel_vm86_regs) - VM86_REGS_SIZE1)
+/* convert kernel_vm86_regs to vm86_regs */
+static int copy_vm86_regs_to_user(struct vm86_regs __user *user,
+ const struct kernel_vm86_regs *regs)
+{
+ int ret = 0;
+
+ /* kernel_vm86_regs is missing xfs, so copy everything up to
+ (but not including) xgs, and then rest after xgs. */
+ ret += copy_to_user(user, regs, offsetof(struct kernel_vm86_regs, pt.xgs));
+ ret += copy_to_user(&user->__null_gs, ®s->pt.xgs,
+ sizeof(struct kernel_vm86_regs) -
+ offsetof(struct kernel_vm86_regs, pt.xgs));
+
+ return ret;
+}
+
+/* convert vm86_regs to kernel_vm86_regs */
+static int copy_vm86_regs_from_user(struct kernel_vm86_regs *regs,
+ const struct vm86_regs __user *user,
+ unsigned extra)
+{
+ int ret = 0;
+
+ ret += copy_from_user(regs, user, offsetof(struct kernel_vm86_regs, pt.xgs));
+ ret += copy_from_user(®s->pt.xgs, &user->__null_gs,
+ sizeof(struct kernel_vm86_regs) -
+ offsetof(struct kernel_vm86_regs, pt.xgs) +
+ extra);
+
+ return ret;
+}
struct pt_regs * FASTCALL(save_v86_state(struct kernel_vm86_regs * regs));
struct pt_regs * fastcall save_v86_state(struct kernel_vm86_regs * regs)
{
+#ifndef CONFIG_X86_NO_TSS
struct tss_struct *tss;
+#endif
struct pt_regs *ret;
unsigned long tmp;
printk("no vm86_info: BAD\n");
do_exit(SIGSEGV);
}
- set_flags(regs->eflags, VEFLAGS, VIF_MASK | current->thread.v86mask);
- tmp = copy_to_user(¤t->thread.vm86_info->regs,regs, VM86_REGS_SIZE1);
- tmp += copy_to_user(¤t->thread.vm86_info->regs.VM86_REGS_PART2,
- ®s->VM86_REGS_PART2, VM86_REGS_SIZE2);
+ set_flags(regs->pt.eflags, VEFLAGS, VIF_MASK | current->thread.v86mask);
+ tmp = copy_vm86_regs_to_user(¤t->thread.vm86_info->regs,regs);
tmp += put_user(current->thread.screen_bitmap,¤t->thread.vm86_info->screen_bitmap);
if (tmp) {
printk("vm86: could not access userspace vm86_info\n");
do_exit(SIGSEGV);
}
+#ifndef CONFIG_X86_NO_TSS
tss = &per_cpu(init_tss, get_cpu());
+#endif
current->thread.esp0 = current->thread.saved_esp0;
current->thread.sysenter_cs = __KERNEL_CS;
load_esp0(tss, ¤t->thread);
current->thread.saved_esp0 = 0;
+#ifndef CONFIG_X86_NO_TSS
put_cpu();
+#endif
- loadsegment(fs, current->thread.saved_fs);
- loadsegment(gs, current->thread.saved_gs);
ret = KVM86->regs32;
+
+ loadsegment(fs, current->thread.saved_fs);
+ ret->xgs = current->thread.saved_gs;
+
return ret;
}
-static void mark_screen_rdonly(struct task_struct * tsk)
+static void mark_screen_rdonly(struct mm_struct *mm)
{
pgd_t *pgd;
pud_t *pud;
pmd_t *pmd;
- pte_t *pte, *mapped;
+ pte_t *pte;
+ spinlock_t *ptl;
int i;
- preempt_disable();
- spin_lock(&tsk->mm->page_table_lock);
- pgd = pgd_offset(tsk->mm, 0xA0000);
- if (pgd_none(*pgd))
- goto out;
- if (pgd_bad(*pgd)) {
- pgd_ERROR(*pgd);
- pgd_clear(pgd);
+ pgd = pgd_offset(mm, 0xA0000);
+ if (pgd_none_or_clear_bad(pgd))
goto out;
- }
pud = pud_offset(pgd, 0xA0000);
- if (pud_none(*pud))
- goto out;
- if (pud_bad(*pud)) {
- pud_ERROR(*pud);
- pud_clear(pud);
+ if (pud_none_or_clear_bad(pud))
goto out;
- }
pmd = pmd_offset(pud, 0xA0000);
- if (pmd_none(*pmd))
- goto out;
- if (pmd_bad(*pmd)) {
- pmd_ERROR(*pmd);
- pmd_clear(pmd);
+ if (pmd_none_or_clear_bad(pmd))
goto out;
- }
- pte = mapped = pte_offset_map(pmd, 0xA0000);
+ pte = pte_offset_map_lock(mm, pmd, 0xA0000, &ptl);
for (i = 0; i < 32; i++) {
if (pte_present(*pte))
set_pte(pte, pte_wrprotect(*pte));
pte++;
}
- pte_unmap(mapped);
+ pte_unmap_unlock(pte, ptl);
out:
- spin_unlock(&tsk->mm->page_table_lock);
- preempt_enable();
flush_tlb();
}
tsk = current;
if (tsk->thread.saved_esp0)
goto out;
- tmp = copy_from_user(&info, v86, VM86_REGS_SIZE1);
- tmp += copy_from_user(&info.regs.VM86_REGS_PART2, &v86->regs.VM86_REGS_PART2,
- (long)&info.vm86plus - (long)&info.regs.VM86_REGS_PART2);
+ tmp = copy_vm86_regs_from_user(&info.regs, &v86->regs,
+ offsetof(struct kernel_vm86_struct, vm86plus) -
+ sizeof(info.regs));
ret = -EFAULT;
if (tmp)
goto out;
goto out;
case VM86_PLUS_INSTALL_CHECK:
/* NOTE: on old vm86 stuff this will return the error
- from verify_area(), because the subfunction is
+ from access_ok(), because the subfunction is
interpreted as (invalid) address to vm86_struct.
So the installation check works.
*/
if (tsk->thread.saved_esp0)
goto out;
v86 = (struct vm86plus_struct __user *)regs.ecx;
- tmp = copy_from_user(&info, v86, VM86_REGS_SIZE1);
- tmp += copy_from_user(&info.regs.VM86_REGS_PART2, &v86->regs.VM86_REGS_PART2,
- (long)&info.regs32 - (long)&info.regs.VM86_REGS_PART2);
+ tmp = copy_vm86_regs_from_user(&info.regs, &v86->regs,
+ offsetof(struct kernel_vm86_struct, regs32) -
+ sizeof(info.regs));
ret = -EFAULT;
if (tmp)
goto out;
static void do_sys_vm86(struct kernel_vm86_struct *info, struct task_struct *tsk)
{
+#ifndef CONFIG_X86_NO_TSS
struct tss_struct *tss;
+#endif
/*
* make sure the vm86() system call doesn't try to do anything silly
*/
- info->regs.__null_ds = 0;
- info->regs.__null_es = 0;
+ info->regs.pt.xds = 0;
+ info->regs.pt.xes = 0;
+ info->regs.pt.xgs = 0;
-/* we are clearing fs,gs later just before "jmp resume_userspace",
- * because starting with Linux 2.1.x they aren't no longer saved/restored
+/* we are clearing fs later just before "jmp resume_userspace",
+ * because it is not saved/restored.
*/
/*
* has set it up safely, so this makes sure interrupt etc flags are
* inherited from protected mode.
*/
- VEFLAGS = info->regs.eflags;
- info->regs.eflags &= SAFE_MASK;
- info->regs.eflags |= info->regs32->eflags & ~SAFE_MASK;
- info->regs.eflags |= VM_MASK;
+ VEFLAGS = info->regs.pt.eflags;
+ info->regs.pt.eflags &= SAFE_MASK;
+ info->regs.pt.eflags |= info->regs32->eflags & ~SAFE_MASK;
+ info->regs.pt.eflags |= VM_MASK;
switch (info->cpu_type) {
case CPU_286:
*/
info->regs32->eax = 0;
tsk->thread.saved_esp0 = tsk->thread.esp0;
- asm volatile("movl %%fs,%0":"=m" (tsk->thread.saved_fs));
- asm volatile("movl %%gs,%0":"=m" (tsk->thread.saved_gs));
+ savesegment(fs, tsk->thread.saved_fs);
+ tsk->thread.saved_gs = info->regs32->xgs;
+#ifndef CONFIG_X86_NO_TSS
tss = &per_cpu(init_tss, get_cpu());
+#endif
tsk->thread.esp0 = (unsigned long) &info->VM86_TSS_ESP0;
if (cpu_has_sep)
tsk->thread.sysenter_cs = 0;
load_esp0(tss, &tsk->thread);
+#ifndef CONFIG_X86_NO_TSS
put_cpu();
+#endif
tsk->thread.screen_bitmap = info->screen_bitmap;
if (info->flags & VM86_SCREEN_BITMAP)
- mark_screen_rdonly(tsk);
+ mark_screen_rdonly(tsk->mm);
+
+ /*call audit_syscall_exit since we do not exit via the normal paths */
+ if (unlikely(current->audit_context))
+ audit_syscall_exit(AUDITSC_RESULT(0), 0);
+
__asm__ __volatile__(
- "xorl %%eax,%%eax; movl %%eax,%%fs; movl %%eax,%%gs\n\t"
"movl %0,%%esp\n\t"
"movl %1,%%ebp\n\t"
+ "mov %2, %%fs\n\t"
"jmp resume_userspace"
: /* no outputs */
- :"r" (&info->regs), "r" (tsk->thread_info) : "ax");
+ :"r" (&info->regs), "r" (task_thread_info(tsk)), "r" (0));
/* we never return here */
}
static inline void clear_TF(struct kernel_vm86_regs * regs)
{
- regs->eflags &= ~TF_MASK;
+ regs->pt.eflags &= ~TF_MASK;
}
static inline void clear_AC(struct kernel_vm86_regs * regs)
{
- regs->eflags &= ~AC_MASK;
+ regs->pt.eflags &= ~AC_MASK;
}
/* It is correct to call set_IF(regs) from the set_vflags_*
static inline void set_vflags_long(unsigned long eflags, struct kernel_vm86_regs * regs)
{
set_flags(VEFLAGS, eflags, current->thread.v86mask);
- set_flags(regs->eflags, eflags, SAFE_MASK);
+ set_flags(regs->pt.eflags, eflags, SAFE_MASK);
if (eflags & IF_MASK)
set_IF(regs);
else
static inline void set_vflags_short(unsigned short flags, struct kernel_vm86_regs * regs)
{
set_flags(VFLAGS, flags, current->thread.v86mask);
- set_flags(regs->eflags, flags, SAFE_MASK);
+ set_flags(regs->pt.eflags, flags, SAFE_MASK);
if (flags & IF_MASK)
set_IF(regs);
else
static inline unsigned long get_vflags(struct kernel_vm86_regs * regs)
{
- unsigned long flags = regs->eflags & RETURN_MASK;
+ unsigned long flags = regs->pt.eflags & RETURN_MASK;
if (VEFLAGS & VIF_MASK)
flags |= IF_MASK;
unsigned long __user *intr_ptr;
unsigned long segoffs;
- if (regs->cs == BIOSSEG)
+ if (regs->pt.xcs == BIOSSEG)
goto cannot_handle;
if (is_revectored(i, &KVM86->int_revectored))
goto cannot_handle;
if ((segoffs >> 16) == BIOSSEG)
goto cannot_handle;
pushw(ssp, sp, get_vflags(regs), cannot_handle);
- pushw(ssp, sp, regs->cs, cannot_handle);
+ pushw(ssp, sp, regs->pt.xcs, cannot_handle);
pushw(ssp, sp, IP(regs), cannot_handle);
- regs->cs = segoffs >> 16;
+ regs->pt.xcs = segoffs >> 16;
SP(regs) -= 6;
IP(regs) = segoffs & 0xffff;
clear_TF(regs);
if (VMPI.is_vm86pus) {
if ( (trapno==3) || (trapno==1) )
return_to_32bit(regs, VM86_TRAP + (trapno << 8));
- do_int(regs, trapno, (unsigned char __user *) (regs->ss << 4), SP(regs));
+ do_int(regs, trapno, (unsigned char __user *) (regs->pt.xss << 4), SP(regs));
return 0;
}
if (trapno !=1)
return 1; /* we let this handle by the calling routine */
- if (current->ptrace & PT_PTRACED) {
- unsigned long flags;
- spin_lock_irqsave(¤t->sighand->siglock, flags);
- sigdelset(¤t->blocked, SIGTRAP);
- recalc_sigpending();
- spin_unlock_irqrestore(¤t->sighand->siglock, flags);
- }
send_sig(SIGTRAP, current, 1);
current->thread.trap_no = trapno;
current->thread.error_code = error_code;
unsigned char opcode;
unsigned char __user *csp;
unsigned char __user *ssp;
- unsigned short ip, sp;
+ unsigned short ip, sp, orig_flags;
int data32, pref_done;
#define CHECK_IF_IN_TRAP \
#define VM86_FAULT_RETURN do { \
if (VMPI.force_return_for_pic && (VEFLAGS & (IF_MASK | VIF_MASK))) \
return_to_32bit(regs, VM86_PICRETURN); \
+ if (orig_flags & TF_MASK) \
+ handle_vm86_trap(regs, 0, 1); \
return; } while (0)
- csp = (unsigned char __user *) (regs->cs << 4);
- ssp = (unsigned char __user *) (regs->ss << 4);
+ orig_flags = *(unsigned short *)®s->pt.eflags;
+
+ csp = (unsigned char __user *) (regs->pt.xcs << 4);
+ ssp = (unsigned char __user *) (regs->pt.xss << 4);
sp = SP(regs);
ip = IP(regs);
SP(regs) += 6;
}
IP(regs) = newip;
- regs->cs = newcs;
+ regs->pt.xcs = newcs;
CHECK_IF_IN_TRAP;
if (data32) {
set_vflags_long(newflags, regs);
| (1 << SIGUSR1) | (1 << SIGUSR2) | (1 << SIGIO) | (1 << SIGURG) \
| (1 << SIGUNUSED) )
-static irqreturn_t irq_handler(int intno, void *dev_id, struct pt_regs * regs)
+static irqreturn_t irq_handler(int intno, void *dev_id)
{
int irq_bit;
unsigned long flags;
irqbits |= irq_bit;
if (vm86_irqs[intno].sig)
send_sig(vm86_irqs[intno].sig, vm86_irqs[intno].tsk, 1);
- spin_unlock_irqrestore(&irqbits_lock, flags);
/*
* IRQ will be re-enabled when user asks for the irq (whether
* polling or as a result of the signal)
*/
- disable_irq(intno);
+ disable_irq_nosync(intno);
+ spin_unlock_irqrestore(&irqbits_lock, flags);
return IRQ_HANDLED;
out:
{
int bit;
unsigned long flags;
+ int ret = 0;
if (invalid_vm86_irq(irqnumber)) return 0;
if (vm86_irqs[irqnumber].tsk != current) return 0;
spin_lock_irqsave(&irqbits_lock, flags);
bit = irqbits & (1 << irqnumber);
irqbits &= ~bit;
+ if (bit) {
+ enable_irq(irqnumber);
+ ret = 1;
+ }
+
spin_unlock_irqrestore(&irqbits_lock, flags);
- if (!bit)
- return 0;
- enable_irq(irqnumber);
- return 1;
+ return ret;
}
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