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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/x86/kernel/vm86_32.c
..
..
@@ -98,7 +98,6 @@
98
98
 	struct task_struct *tsk = current;
99
99
 	struct vm86plus_struct __user *user;
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 	struct vm86 *vm86 = current->thread.vm86;
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-	long err = 0;
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101
 
103
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 	/*
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 	 * This gets called from entry.S with interrupts disabled, but
..
..
@@ -114,37 +113,30 @@
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 	set_flags(regs->pt.flags, VEFLAGS, X86_EFLAGS_VIF | vm86->veflags_mask);
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 	user = vm86->user_vm86;
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115
 
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-	if (!access_ok(VERIFY_WRITE, user, vm86->vm86plus.is_vm86pus ?
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+	if (!user_access_begin(user, vm86->vm86plus.is_vm86pus ?
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 		       sizeof(struct vm86plus_struct) :
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-		       sizeof(struct vm86_struct))) {
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-		pr_alert("could not access userspace vm86 info\n");
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-		do_exit(SIGSEGV);
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-	}
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+		       sizeof(struct vm86_struct)))
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+		goto Efault;
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120
 
124
-	put_user_try {
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-		put_user_ex(regs->pt.bx, &user->regs.ebx);
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-		put_user_ex(regs->pt.cx, &user->regs.ecx);
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-		put_user_ex(regs->pt.dx, &user->regs.edx);
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-		put_user_ex(regs->pt.si, &user->regs.esi);
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-		put_user_ex(regs->pt.di, &user->regs.edi);
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-		put_user_ex(regs->pt.bp, &user->regs.ebp);
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-		put_user_ex(regs->pt.ax, &user->regs.eax);
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-		put_user_ex(regs->pt.ip, &user->regs.eip);
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-		put_user_ex(regs->pt.cs, &user->regs.cs);
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-		put_user_ex(regs->pt.flags, &user->regs.eflags);
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-		put_user_ex(regs->pt.sp, &user->regs.esp);
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-		put_user_ex(regs->pt.ss, &user->regs.ss);
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-		put_user_ex(regs->es, &user->regs.es);
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-		put_user_ex(regs->ds, &user->regs.ds);
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-		put_user_ex(regs->fs, &user->regs.fs);
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-		put_user_ex(regs->gs, &user->regs.gs);
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+	unsafe_put_user(regs->pt.bx, &user->regs.ebx, Efault_end);
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+	unsafe_put_user(regs->pt.cx, &user->regs.ecx, Efault_end);
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+	unsafe_put_user(regs->pt.dx, &user->regs.edx, Efault_end);
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+	unsafe_put_user(regs->pt.si, &user->regs.esi, Efault_end);
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+	unsafe_put_user(regs->pt.di, &user->regs.edi, Efault_end);
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+	unsafe_put_user(regs->pt.bp, &user->regs.ebp, Efault_end);
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+	unsafe_put_user(regs->pt.ax, &user->regs.eax, Efault_end);
128
+	unsafe_put_user(regs->pt.ip, &user->regs.eip, Efault_end);
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+	unsafe_put_user(regs->pt.cs, &user->regs.cs, Efault_end);
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+	unsafe_put_user(regs->pt.flags, &user->regs.eflags, Efault_end);
131
+	unsafe_put_user(regs->pt.sp, &user->regs.esp, Efault_end);
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+	unsafe_put_user(regs->pt.ss, &user->regs.ss, Efault_end);
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+	unsafe_put_user(regs->es, &user->regs.es, Efault_end);
134
+	unsafe_put_user(regs->ds, &user->regs.ds, Efault_end);
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+	unsafe_put_user(regs->fs, &user->regs.fs, Efault_end);
136
+	unsafe_put_user(regs->gs, &user->regs.gs, Efault_end);
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+	unsafe_put_user(vm86->screen_bitmap, &user->screen_bitmap, Efault_end);
141
138
 
142
-		put_user_ex(vm86->screen_bitmap, &user->screen_bitmap);
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-	} put_user_catch(err);
144
-	if (err) {
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-		pr_alert("could not access userspace vm86 info\n");
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-		do_exit(SIGSEGV);
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-	}
139
+	user_access_end();
148
140
 
149
141
 	preempt_disable();
150
142
 	tsk->thread.sp0 = vm86->saved_sp0;
..
..
@@ -159,6 +151,13 @@
159
151
 	lazy_load_gs(vm86->regs32.gs);
160
152
 
161
153
 	regs->pt.ax = retval;
154
+	return;
155
+
156
+Efault_end:
157
+	user_access_end();
158
+Efault:
159
+	pr_alert("could not access userspace vm86 info\n");
160
+	do_exit(SIGSEGV);
162
161
 }
163
162
 
164
163
 static void mark_screen_rdonly(struct mm_struct *mm)
..
..
@@ -172,7 +171,7 @@
172
171
 	pte_t *pte;
173
172
 	int i;
174
173
 
175
-	down_write(&mm->mmap_sem);
174
+	mmap_write_lock(mm);
176
175
 	pgd = pgd_offset(mm, 0xA0000);
177
176
 	if (pgd_none_or_clear_bad(pgd))
178
177
 		goto out;
..
..
@@ -198,8 +197,8 @@
198
197
 	}
199
198
 	pte_unmap_unlock(pte, ptl);
200
199
 out:
201
-	up_write(&mm->mmap_sem);
202
-	flush_tlb_mm_range(mm, 0xA0000, 0xA0000 + 32*PAGE_SIZE, 0UL);
200
+	mmap_write_unlock(mm);
201
+	flush_tlb_mm_range(mm, 0xA0000, 0xA0000 + 32*PAGE_SIZE, PAGE_SHIFT, false);
203
202
 }
204
203
 
205
204
 
..
..
@@ -243,6 +242,7 @@
243
242
 	struct kernel_vm86_regs vm86regs;
244
243
 	struct pt_regs *regs = current_pt_regs();
245
244
 	unsigned long err = 0;
245
+	struct vm86_struct v;
246
246
 
247
247
 	err = security_mmap_addr(0);
248
248
 	if (err) {
..
..
@@ -278,39 +278,32 @@
278
278
 	if (vm86->saved_sp0)
279
279
 		return -EPERM;
280
280
 
281
-	if (!access_ok(VERIFY_READ, user_vm86, plus ?
282
-		       sizeof(struct vm86_struct) :
283
-		       sizeof(struct vm86plus_struct)))
281
+	if (copy_from_user(&v, user_vm86,
282
+			offsetof(struct vm86_struct, int_revectored)))
284
283
 		return -EFAULT;
285
284
 
286
285
 	memset(&vm86regs, 0, sizeof(vm86regs));
287
-	get_user_try {
288
-		unsigned short seg;
289
-		get_user_ex(vm86regs.pt.bx, &user_vm86->regs.ebx);
290
-		get_user_ex(vm86regs.pt.cx, &user_vm86->regs.ecx);
291
-		get_user_ex(vm86regs.pt.dx, &user_vm86->regs.edx);
292
-		get_user_ex(vm86regs.pt.si, &user_vm86->regs.esi);
293
-		get_user_ex(vm86regs.pt.di, &user_vm86->regs.edi);
294
-		get_user_ex(vm86regs.pt.bp, &user_vm86->regs.ebp);
295
-		get_user_ex(vm86regs.pt.ax, &user_vm86->regs.eax);
296
-		get_user_ex(vm86regs.pt.ip, &user_vm86->regs.eip);
297
-		get_user_ex(seg, &user_vm86->regs.cs);
298
-		vm86regs.pt.cs = seg;
299
-		get_user_ex(vm86regs.pt.flags, &user_vm86->regs.eflags);
300
-		get_user_ex(vm86regs.pt.sp, &user_vm86->regs.esp);
301
-		get_user_ex(seg, &user_vm86->regs.ss);
302
-		vm86regs.pt.ss = seg;
303
-		get_user_ex(vm86regs.es, &user_vm86->regs.es);
304
-		get_user_ex(vm86regs.ds, &user_vm86->regs.ds);
305
-		get_user_ex(vm86regs.fs, &user_vm86->regs.fs);
306
-		get_user_ex(vm86regs.gs, &user_vm86->regs.gs);
307
286
 
308
-		get_user_ex(vm86->flags, &user_vm86->flags);
309
-		get_user_ex(vm86->screen_bitmap, &user_vm86->screen_bitmap);
310
-		get_user_ex(vm86->cpu_type, &user_vm86->cpu_type);
311
-	} get_user_catch(err);
312
-	if (err)
313
-		return err;
287
+	vm86regs.pt.bx = v.regs.ebx;
288
+	vm86regs.pt.cx = v.regs.ecx;
289
+	vm86regs.pt.dx = v.regs.edx;
290
+	vm86regs.pt.si = v.regs.esi;
291
+	vm86regs.pt.di = v.regs.edi;
292
+	vm86regs.pt.bp = v.regs.ebp;
293
+	vm86regs.pt.ax = v.regs.eax;
294
+	vm86regs.pt.ip = v.regs.eip;
295
+	vm86regs.pt.cs = v.regs.cs;
296
+	vm86regs.pt.flags = v.regs.eflags;
297
+	vm86regs.pt.sp = v.regs.esp;
298
+	vm86regs.pt.ss = v.regs.ss;
299
+	vm86regs.es = v.regs.es;
300
+	vm86regs.ds = v.regs.ds;
301
+	vm86regs.fs = v.regs.fs;
302
+	vm86regs.gs = v.regs.gs;
303
+
304
+	vm86->flags = v.flags;
305
+	vm86->screen_bitmap = v.screen_bitmap;
306
+	vm86->cpu_type = v.cpu_type;
314
307
 
315
308
 	if (copy_from_user(&vm86->int_revectored,
316
309
 			   &user_vm86->int_revectored,
..
..
@@ -369,7 +362,7 @@
369
362
 	preempt_disable();
370
363
 	tsk->thread.sp0 += 16;
371
364
 
372
-	if (static_cpu_has(X86_FEATURE_SEP)) {
365
+	if (boot_cpu_has(X86_FEATURE_SEP)) {
373
366
 		tsk->thread.sysenter_cs = 0;
374
367
 		refresh_sysenter_cs(&tsk->thread);
375
368
 	}
..
..
@@ -381,7 +374,6 @@
381
374
 		mark_screen_rdonly(tsk->mm);
382
375
 
383
376
 	memcpy((struct kernel_vm86_regs *)regs, &vm86regs, sizeof(vm86regs));
384
-	force_iret();
385
377
 	return regs->ax;
386
378
 }
387
379
 
..
..
@@ -583,7 +575,7 @@
583
575
 		return 1; /* we let this handle by the calling routine */
584
576
 	current->thread.trap_nr = trapno;
585
577
 	current->thread.error_code = error_code;
586
-	force_sig(SIGTRAP, current);
578
+	force_sig(SIGTRAP);
587
579
 	return 0;
588
580
 }
589
581