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Commit bf2fcc6f authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
Browse files

[PATCH] x86_64: Implement is_compat_task the right way 



By setting a flag during a 32bit system call only

Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 2966387b

arch/x86_64/ia32/ia32entry.S

+5 −0
Original line number Diff line number Diff line
@@ -104,6 +104,7 @@ ENTRY(ia32_sysenter_target) 
 	.quad 1b,ia32_badarg

 	.previous	

	GET_THREAD_INFO(%r10)

	orl    $TS_COMPAT,threadinfo_status(%r10)

	testl  $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)

	CFI_REMEMBER_STATE

	jnz  sysenter_tracesys
@@ -117,6 +118,7 @@ sysenter_do_call: 
	cli

	testl	$_TIF_ALLWORK_MASK,threadinfo_flags(%r10)

	jnz	int_ret_from_sys_call

	andl    $~TS_COMPAT,threadinfo_status(%r10)

	/* clear IF, that popfq doesn't enable interrupts early */

	andl  $~0x200,EFLAGS-R11(%rsp) 

	RESTORE_ARGS 1,24,1,1,1,1
@@ -203,6 +205,7 @@ ENTRY(ia32_cstar_target) 
	.quad 1b,ia32_badarg

	.previous	

	GET_THREAD_INFO(%r10)

	orl   $TS_COMPAT,threadinfo_status(%r10)

	testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)

	CFI_REMEMBER_STATE

	jnz   cstar_tracesys
@@ -216,6 +219,7 @@ cstar_do_call: 
	cli

	testl $_TIF_ALLWORK_MASK,threadinfo_flags(%r10)

	jnz  int_ret_from_sys_call

	andl $~TS_COMPAT,threadinfo_status(%r10)

	RESTORE_ARGS 1,-ARG_SKIP,1,1,1

	movl RIP-ARGOFFSET(%rsp),%ecx

	CFI_REGISTER rip,rcx
@@ -288,6 +292,7 @@ ENTRY(ia32_syscall) 
	   this could be a problem. */

	SAVE_ARGS 0,0,1

	GET_THREAD_INFO(%r10)

	orl   $TS_COMPAT,threadinfo_status(%r10)

	testl $(_TIF_SYSCALL_TRACE|_TIF_SYSCALL_AUDIT|_TIF_SECCOMP),threadinfo_flags(%r10)

	jnz ia32_tracesys

ia32_do_syscall:

arch/x86_64/kernel/asm-offsets.c

+1 −0
Original line number Diff line number Diff line
@@ -33,6 +33,7 @@ int main(void) 
	ENTRY(flags);

	ENTRY(addr_limit);

	ENTRY(preempt_count);

	ENTRY(status);

	BLANK();

#undef ENTRY

#define ENTRY(entry) DEFINE(pda_ ## entry, offsetof(struct x8664_pda, entry))

arch/x86_64/kernel/entry.S

+1 −0
Original line number Diff line number Diff line
@@ -313,6 +313,7 @@ int_with_check: 
	movl threadinfo_flags(%rcx),%edx

	andl %edi,%edx

	jnz   int_careful

	andl    $~TS_COMPAT,threadinfo_status(%rcx)

	jmp   retint_swapgs



	/* Either reschedule or signal or syscall exit tracking needed. */

drivers/input/evdev.c

+3 −1
Original line number Diff line number Diff line
@@ -154,8 +154,10 @@ struct input_event_compat { 
	__s32 value;

};



/* Note to the author of this code: did it ever occur to

   you why the ifdefs are needed? Think about it again. -AK */

#ifdef CONFIG_X86_64

#  define COMPAT_TEST test_thread_flag(TIF_IA32)

#  define COMPAT_TEST is_compat_task()

#elif defined(CONFIG_IA64)

#  define COMPAT_TEST IS_IA32_PROCESS(ia64_task_regs(current))

#elif defined(CONFIG_S390)

include/asm-x86_64/compat.h

+5 −0
Original line number Diff line number Diff line
@@ -202,4 +202,9 @@ static __inline__ void __user *compat_alloc_user_space(long len) 
	return (void __user *)regs->rsp - len; 

}



static inline int is_compat_task(void)

{

	return current_thread_info()->status & TS_COMPAT;

}



#endif /* _ASM_X86_64_COMPAT_H */