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Commit 69d5ffda authored by Arnd Bergmann's avatar Arnd Bergmann Committed by H. Peter Anvin
Browse files

x86: convert termios.h to the asm-generic version 



This patch turned out more controversial than expected
and may get dropped in the future. I'm including it
for reference anyway.

The user_termio_to_kernel_termios and kernel_termios_to_user_termio
functions on x86 are lacking error checking from get_user and
are not portable to big-endian systems, so the asm-generic
header has to differ in this regard.

Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
LKML-Reference: <cover.1245354003.git.arnd@arndb.de>
Signed-off-by: default avatarH. Peter Anvin <hpa@zytor.com>
parent 06f5013a

arch/x86/include/asm/termios.h

+63 −23
Original line number Diff line number Diff line 
#ifndef _ASM_X86_TERMIOS_H

#define _ASM_X86_TERMIOS_H

#ifndef _ASM_GENERIC_TERMIOS_H

#define _ASM_GENERIC_TERMIOS_H

/*

 * Most architectures have straight copies of the x86 code, with

 * varying levels of bug fixes on top. Usually it's a good idea

 * to use this generic version instead, but be careful to avoid

 * ABI changes.

 * New architectures should not provide their own version.

 */



#include <asm/termbits.h>

#include <asm/ioctls.h>
@@ -54,21 +61,37 @@ struct termio { 
/*

 * Translate a "termio" structure into a "termios". Ugh.

 */

#define SET_LOW_TERMIOS_BITS(termios, termio, x) { \

	unsigned short __tmp; \

	get_user(__tmp,&(termio)->x); \

	*(unsigned short *) &(termios)->x = __tmp; \

}



static inline int user_termio_to_kernel_termios(struct ktermios *termios,

						struct termio __user *termio)

						const struct termio __user *termio)

{

	SET_LOW_TERMIOS_BITS(termios, termio, c_iflag);

	SET_LOW_TERMIOS_BITS(termios, termio, c_oflag);

	SET_LOW_TERMIOS_BITS(termios, termio, c_cflag);

	SET_LOW_TERMIOS_BITS(termios, termio, c_lflag);

	get_user(termios->c_line, &termio->c_line);

	return copy_from_user(termios->c_cc, termio->c_cc, NCC);

	unsigned short tmp;



	if (get_user(tmp, &termio->c_iflag) < 0)

		goto fault;

	termios->c_iflag = (0xffff0000 & termios->c_iflag) | tmp;



	if (get_user(tmp, &termio->c_oflag) < 0)

		goto fault;

	termios->c_oflag = (0xffff0000 & termios->c_oflag) | tmp;



	if (get_user(tmp, &termio->c_cflag) < 0)

		goto fault;

	termios->c_cflag = (0xffff0000 & termios->c_cflag) | tmp;



	if (get_user(tmp, &termio->c_lflag) < 0)

		goto fault;

	termios->c_lflag = (0xffff0000 & termios->c_lflag) | tmp;



	if (get_user(termios->c_line, &termio->c_line) < 0)

		goto fault;



	if (copy_from_user(termios->c_cc, termio->c_cc, NCC) != 0)

		goto fault;



	return 0;



 fault:

	return -EFAULT;

}



/*
@@ -77,14 +100,18 @@ static inline int user_termio_to_kernel_termios(struct ktermios *termios, 
static inline int kernel_termios_to_user_termio(struct termio __user *termio,

						struct ktermios *termios)

{

	put_user((termios)->c_iflag, &(termio)->c_iflag);

	put_user((termios)->c_oflag, &(termio)->c_oflag);

	put_user((termios)->c_cflag, &(termio)->c_cflag);

	put_user((termios)->c_lflag, &(termio)->c_lflag);

	put_user((termios)->c_line,  &(termio)->c_line);

	return copy_to_user((termio)->c_cc, (termios)->c_cc, NCC);

	if (put_user(termios->c_iflag, &termio->c_iflag) < 0 ||

	    put_user(termios->c_oflag, &termio->c_oflag) < 0 ||

	    put_user(termios->c_cflag, &termio->c_cflag) < 0 ||

	    put_user(termios->c_lflag, &termio->c_lflag) < 0 ||

	    put_user(termios->c_line,  &termio->c_line) < 0 ||

	    copy_to_user(termio->c_cc, termios->c_cc, NCC) != 0)

		return -EFAULT;



	return 0;

}



#ifdef TCGETS2

static inline int user_termios_to_kernel_termios(struct ktermios *k,

						 struct termios2 __user *u)

{
@@ -108,7 +135,20 @@ static inline int kernel_termios_to_user_termios_1(struct termios __user *u, 
{

	return copy_to_user(u, k, sizeof(struct termios));

}

#else /* TCGETS2 */

static inline int user_termios_to_kernel_termios(struct ktermios *k,

						 struct termios __user *u)

{

	return copy_from_user(k, u, sizeof(struct termios));

}



static inline int kernel_termios_to_user_termios(struct termios __user *u,

						 struct ktermios *k)

{

	return copy_to_user(u, k, sizeof(struct termios));

}

#endif /* TCGETS2 */



#endif	/* __KERNEL__ */



#endif /* _ASM_X86_TERMIOS_H */
 
#endif /* _ASM_GENERIC_TERMIOS_H */