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Message-Id: <1438148483-11932-8-git-send-email-brgerst@gmail.com>
Date: Wed, 29 Jul 2015 01:41:22 -0400
From: Brian Gerst <brgerst@...il.com>
To: x86@...nel.org, linux-kernel@...r.kernel.org
Cc: Ingo Molnar <mingo@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
Denys Vlasenko <dvlasenk@...hat.com>,
Andy Lutomirski <luto@...capital.net>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 7/8] x86/vm86: Rename vm86->vm86_info to user_vm86
Make it clearer that this is the pointer to the userspace vm86 state area.
Signed-off-by: Brian Gerst <brgerst@...il.com>
---
arch/x86/include/asm/vm86.h | 2 +-
arch/x86/kernel/vm86_32.c | 70 +++++++++++++++++++++++----------------------
2 files changed, 37 insertions(+), 35 deletions(-)
diff --git a/arch/x86/include/asm/vm86.h b/arch/x86/include/asm/vm86.h
index 05f6394..5c027c5 100644
--- a/arch/x86/include/asm/vm86.h
+++ b/arch/x86/include/asm/vm86.h
@@ -28,7 +28,7 @@ struct kernel_vm86_regs {
};
struct vm86 {
- struct vm86plus_struct __user *vm86_info;
+ struct vm86plus_struct __user *user_vm86;
struct pt_regs regs32;
unsigned long v86flags;
unsigned long v86mask;
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 6fce378..aca499d 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -104,17 +104,17 @@ void save_v86_state(struct kernel_vm86_regs *regs, int retval)
*/
local_irq_enable();
- if (!vm86 || !vm86->vm86_info) {
- pr_alert("no vm86_info: BAD\n");
+ if (!vm86 || !vm86->user_vm86) {
+ pr_alert("no user_vm86: BAD\n");
do_exit(SIGSEGV);
}
set_flags(regs->pt.flags, VEFLAGS, X86_EFLAGS_VIF | vm86->v86mask);
- user = vm86->vm86_info;
+ user = vm86->user_vm86;
if (!access_ok(VERIFY_WRITE, user, vm86->vm86plus.is_vm86pus ?
sizeof(struct vm86plus_struct) :
sizeof(struct vm86_struct))) {
- pr_alert("could not access userspace vm86_info\n");
+ pr_alert("could not access userspace vm86 info\n");
do_exit(SIGSEGV);
}
@@ -139,7 +139,7 @@ void save_v86_state(struct kernel_vm86_regs *regs, int retval)
put_user_ex(vm86->screen_bitmap, &user->screen_bitmap);
} put_user_catch(err);
if (err) {
- pr_alert("could not access userspace vm86_info\n");
+ pr_alert("could not access userspace vm86 info\n");
do_exit(SIGSEGV);
}
@@ -199,11 +199,11 @@ static inline int do_vm86_irq_handling(int subfunction, int irqnumber)
}
#endif
-static long do_sys_vm86(struct vm86plus_struct __user *v86, bool plus);
+static long do_sys_vm86(struct vm86plus_struct __user *user_vm86, bool plus);
-SYSCALL_DEFINE1(vm86old, struct vm86_struct __user *, v86)
+SYSCALL_DEFINE1(vm86old, struct vm86_struct __user *, user_vm86)
{
- return do_sys_vm86((struct vm86plus_struct __user *) v86, false);
+ return do_sys_vm86((struct vm86plus_struct __user *) user_vm86, false);
}
@@ -230,7 +230,7 @@ SYSCALL_DEFINE2(vm86, unsigned long, cmd, unsigned long, arg)
}
-static long do_sys_vm86(struct vm86plus_struct __user *v86, bool plus)
+static long do_sys_vm86(struct vm86plus_struct __user *user_vm86, bool plus)
{
struct tss_struct *tss;
struct task_struct *tsk = current;
@@ -247,7 +247,7 @@ static long do_sys_vm86(struct vm86plus_struct __user *v86, bool plus)
if (vm86->saved_sp0)
return -EPERM;
- if (!access_ok(VERIFY_READ, v86, plus ?
+ if (!access_ok(VERIFY_READ, user_vm86, plus ?
sizeof(struct vm86_struct) :
sizeof(struct vm86plus_struct)))
return -EFAULT;
@@ -255,40 +255,42 @@ static long do_sys_vm86(struct vm86plus_struct __user *v86, bool plus)
memset(&vm86regs, 0, sizeof(vm86regs));
get_user_try {
unsigned short seg;
- get_user_ex(vm86regs.pt.bx, &v86->regs.ebx);
- get_user_ex(vm86regs.pt.cx, &v86->regs.ecx);
- get_user_ex(vm86regs.pt.dx, &v86->regs.edx);
- get_user_ex(vm86regs.pt.si, &v86->regs.esi);
- get_user_ex(vm86regs.pt.di, &v86->regs.edi);
- get_user_ex(vm86regs.pt.bp, &v86->regs.ebp);
- get_user_ex(vm86regs.pt.ax, &v86->regs.eax);
- get_user_ex(vm86regs.pt.ip, &v86->regs.eip);
- get_user_ex(seg, &v86->regs.cs);
+ get_user_ex(vm86regs.pt.bx, &user_vm86->regs.ebx);
+ get_user_ex(vm86regs.pt.cx, &user_vm86->regs.ecx);
+ get_user_ex(vm86regs.pt.dx, &user_vm86->regs.edx);
+ get_user_ex(vm86regs.pt.si, &user_vm86->regs.esi);
+ get_user_ex(vm86regs.pt.di, &user_vm86->regs.edi);
+ get_user_ex(vm86regs.pt.bp, &user_vm86->regs.ebp);
+ get_user_ex(vm86regs.pt.ax, &user_vm86->regs.eax);
+ get_user_ex(vm86regs.pt.ip, &user_vm86->regs.eip);
+ get_user_ex(seg, &user_vm86->regs.cs);
vm86regs.pt.cs = seg;
- get_user_ex(vm86regs.pt.flags, &v86->regs.eflags);
- get_user_ex(vm86regs.pt.sp, &v86->regs.esp);
- get_user_ex(seg, &v86->regs.ss);
+ get_user_ex(vm86regs.pt.flags, &user_vm86->regs.eflags);
+ get_user_ex(vm86regs.pt.sp, &user_vm86->regs.esp);
+ get_user_ex(seg, &user_vm86->regs.ss);
vm86regs.pt.ss = seg;
- get_user_ex(vm86regs.es, &v86->regs.es);
- get_user_ex(vm86regs.ds, &v86->regs.ds);
- get_user_ex(vm86regs.fs, &v86->regs.fs);
- get_user_ex(vm86regs.gs, &v86->regs.gs);
-
- get_user_ex(vm86->flags, &v86->flags);
- get_user_ex(vm86->screen_bitmap, &v86->screen_bitmap);
- get_user_ex(vm86->cpu_type, &v86->cpu_type);
+ get_user_ex(vm86regs.es, &user_vm86->regs.es);
+ get_user_ex(vm86regs.ds, &user_vm86->regs.ds);
+ get_user_ex(vm86regs.fs, &user_vm86->regs.fs);
+ get_user_ex(vm86regs.gs, &user_vm86->regs.gs);
+
+ get_user_ex(vm86->flags, &user_vm86->flags);
+ get_user_ex(vm86->screen_bitmap, &user_vm86->screen_bitmap);
+ get_user_ex(vm86->cpu_type, &user_vm86->cpu_type);
} get_user_catch(err);
if (err)
return err;
- if (copy_from_user(&vm86->int_revectored, &v86->int_revectored,
+ if (copy_from_user(&vm86->int_revectored,
+ &user_vm86->int_revectored,
sizeof(struct revectored_struct)))
return -EFAULT;
- if (copy_from_user(&vm86->int21_revectored, &v86->int21_revectored,
+ if (copy_from_user(&vm86->int21_revectored,
+ &user_vm86->int21_revectored,
sizeof(struct revectored_struct)))
return -EFAULT;
if (plus) {
- if (copy_from_user(&vm86->vm86plus, &v86->vm86plus,
+ if (copy_from_user(&vm86->vm86plus, &user_vm86->vm86plus,
sizeof(struct vm86plus_info_struct)))
return -EFAULT;
vm86->vm86plus.is_vm86pus = 1;
@@ -297,7 +299,7 @@ static long do_sys_vm86(struct vm86plus_struct __user *v86, bool plus)
sizeof(struct vm86plus_info_struct));
memcpy(&vm86->regs32, regs, sizeof(struct pt_regs));
- vm86->vm86_info = v86;
+ vm86->user_vm86 = user_vm86;
/*
* The flags register is also special: we cannot trust that the user
--
2.4.3
--
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