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x86/asm: Move the thread_info::status field to thread_struct

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Because sched.h and thread_info.h are a tangled mess, I turned
in_compat_syscall() into a macro.  If we had current_thread_struct()
or similar and we could use it from thread_info.h, then this would
be a bit cleaner.

Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jann Horn <jann@thejh.net>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/ccc8a1b2f41f9c264a41f771bb4a6539a642ad72.1473801993.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Andy Lutomirski 2016-09-13 14:29:21 -07:00 committed by Ingo Molnar
parent d4b80afbba
commit b9d989c721
9 changed files with 27 additions and 42 deletions
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4
arch/x86/entry/common.c
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@ -209,7 +209,7 @@ __visible inline void prepare_exit_to_usermode(struct pt_regs *regs)
* special case only applies after poking regs and before the
* very next return to user mode.
*/
ti->status &= ~(TS_COMPAT|TS_I386_REGS_POKED);
current->thread.status &= ~(TS_COMPAT|TS_I386_REGS_POKED);
#endif
user_enter_irqoff();
@ -307,7 +307,7 @@ static __always_inline void do_syscall_32_irqs_on(struct pt_regs *regs)
unsigned int nr = (unsigned int)regs->orig_ax;
#ifdef CONFIG_IA32_EMULATION
ti->status |= TS_COMPAT;
current->thread.status |= TS_COMPAT;
#endif
if (READ_ONCE(ti->flags) & _TIF_WORK_SYSCALL_ENTRY) {

12
arch/x86/include/asm/processor.h
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@ -389,6 +389,9 @@ struct thread_struct {
unsigned short fsindex;
unsigned short gsindex;
#endif
u32 status; /* thread synchronous flags */
#ifdef CONFIG_X86_64
unsigned long fsbase;
unsigned long gsbase;
@ -434,6 +437,15 @@ struct thread_struct {
*/
};
/*
* Thread-synchronous status.
*
* This is different from the flags in that nobody else
* ever touches our thread-synchronous status, so we don't
* have to worry about atomic accesses.
*/
#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
/*
* Set IOPL bits in EFLAGS from given mask
*/

20
arch/x86/include/asm/syscall.h
View File

@ -60,7 +60,7 @@ static inline long syscall_get_error(struct task_struct *task,
* TS_COMPAT is set for 32-bit syscall entries and then
* remains set until we return to user mode.
*/
if (task_thread_info(task)->status & (TS_COMPAT|TS_I386_REGS_POKED))
if (task->thread.status & (TS_COMPAT|TS_I386_REGS_POKED))
/*
* Sign-extend the value so (int)-EFOO becomes (long)-EFOO
* and will match correctly in comparisons.
@ -116,7 +116,7 @@ static inline void syscall_get_arguments(struct task_struct *task,
unsigned long *args)
{
# ifdef CONFIG_IA32_EMULATION
if (task_thread_info(task)->status & TS_COMPAT)
if (task->thread.status & TS_COMPAT)
switch (i) {
case 0:
if (!n--) break;
@ -177,7 +177,7 @@ static inline void syscall_set_arguments(struct task_struct *task,
const unsigned long *args)
{
# ifdef CONFIG_IA32_EMULATION
if (task_thread_info(task)->status & TS_COMPAT)
if (task->thread.status & TS_COMPAT)
switch (i) {
case 0:
if (!n--) break;
@ -234,18 +234,8 @@ static inline void syscall_set_arguments(struct task_struct *task,
static inline int syscall_get_arch(void)
{
#ifdef CONFIG_IA32_EMULATION
/*
* TS_COMPAT is set for 32-bit syscall entry and then
* remains set until we return to user mode.
*
* x32 tasks should be considered AUDIT_ARCH_X86_64.
*/
if (task_thread_info(current)->status & TS_COMPAT)
return AUDIT_ARCH_I386;
#endif
/* Both x32 and x86_64 are considered "64-bit". */
return AUDIT_ARCH_X86_64;
/* x32 tasks should be considered AUDIT_ARCH_X86_64. */
return in_ia32_syscall() ? AUDIT_ARCH_I386 : AUDIT_ARCH_X86_64;
}
#endif /* CONFIG_X86_32 */

23
arch/x86/include/asm/thread_info.h
View File

@ -55,7 +55,6 @@ struct task_struct;
struct thread_info {
struct task_struct *task; /* main task structure */
__u32 flags; /* low level flags */
__u32 status; /* thread synchronous flags */
__u32 cpu; /* current CPU */
};
@ -253,31 +252,17 @@ static inline int arch_within_stack_frames(const void * const stack,
#endif
/*
* Thread-synchronous status.
*
* This is different from the flags in that nobody else
* ever touches our thread-synchronous status, so we don't
* have to worry about atomic accesses.
*/
#define TS_COMPAT 0x0002 /* 32bit syscall active (64BIT)*/
#ifdef CONFIG_COMPAT
#define TS_I386_REGS_POKED 0x0004 /* regs poked by 32-bit ptracer */
#endif
#ifndef __ASSEMBLY__
static inline bool in_ia32_syscall(void)
{
#ifdef CONFIG_X86_32
return true;
#define in_ia32_syscall() true
#else
#define in_ia32_syscall() (IS_ENABLED(CONFIG_IA32_EMULATION) && \
current->thread.status & TS_COMPAT)
#endif
#ifdef CONFIG_IA32_EMULATION
if (current_thread_info()->status & TS_COMPAT)
return true;
#endif
return false;
}
/*
* Force syscall return via IRET by making it look as if there was

1
arch/x86/kernel/asm-offsets.c
View File

@ -36,7 +36,6 @@ void common(void) {
BLANK();
OFFSET(TI_flags, thread_info, flags);
OFFSET(TI_status, thread_info, status);
BLANK();
OFFSET(TASK_addr_limit, task_struct, thread.addr_limit);

1
arch/x86/kernel/fpu/init.c
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@ -317,7 +317,6 @@ static void __init fpu__init_system_ctx_switch(void)
on_boot_cpu = 0;
WARN_ON_FPU(current->thread.fpu.fpstate_active);
current_thread_info()->status = 0;
if (boot_cpu_has(X86_FEATURE_XSAVEOPT) && eagerfpu != DISABLE)
eagerfpu = ENABLE;

4
arch/x86/kernel/process_64.c
View File

@ -510,7 +510,7 @@ void set_personality_ia32(bool x32)
current->personality &= ~READ_IMPLIES_EXEC;
/* in_compat_syscall() uses the presence of the x32
syscall bit flag to determine compat status */
current_thread_info()->status &= ~TS_COMPAT;
current->thread.status &= ~TS_COMPAT;
} else {
set_thread_flag(TIF_IA32);
clear_thread_flag(TIF_X32);
@ -518,7 +518,7 @@ void set_personality_ia32(bool x32)
current->mm->context.ia32_compat = TIF_IA32;
current->personality |= force_personality32;
/* Prepare the first "return" to user space */
current_thread_info()->status |= TS_COMPAT;
current->thread.status |= TS_COMPAT;
}
}
EXPORT_SYMBOL_GPL(set_personality_ia32);

2
arch/x86/kernel/ptrace.c
View File

@ -934,7 +934,7 @@ static int putreg32(struct task_struct *child, unsigned regno, u32 value)
*/
regs->orig_ax = value;
if (syscall_get_nr(child, regs) >= 0)
task_thread_info(child)->status |= TS_I386_REGS_POKED;
child->thread.status |= TS_I386_REGS_POKED;
break;
case offsetof(struct user32, regs.eflags):

2
arch/x86/kernel/signal.c
View File

@ -783,7 +783,7 @@ static inline unsigned long get_nr_restart_syscall(const struct pt_regs *regs)
* than the tracee.
*/
#ifdef CONFIG_IA32_EMULATION
if (current_thread_info()->status & (TS_COMPAT|TS_I386_REGS_POKED))
if (current->thread.status & (TS_COMPAT|TS_I386_REGS_POKED))
return __NR_ia32_restart_syscall;
#endif
#ifdef CONFIG_X86_X32_ABI