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Commit 7116e994 authored by Heiko Carstens's avatar Heiko Carstens Committed by Linus Torvalds
Browse files

[PATCH] compat: fix uaccess handling 



Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 841d5fb7

fs/compat.c

+19 −16
Original line number Diff line number Diff line
@@ -1144,7 +1144,9 @@ asmlinkage long compat_sys_getdents64(unsigned int fd, 
	lastdirent = buf.previous;

	if (lastdirent) {

		typeof(lastdirent->d_off) d_off = file->f_pos;

		__put_user_unaligned(d_off, &lastdirent->d_off);

		error = -EFAULT;

		if (__put_user_unaligned(d_off, &lastdirent->d_off))

			goto out_putf;

		error = count - buf.count;

	}
@@ -1611,14 +1613,14 @@ int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, 
		nr &= ~1UL;

		while (nr) {

			unsigned long h, l;

			__get_user(l, ufdset);

			__get_user(h, ufdset+1);

			if (__get_user(l, ufdset) || __get_user(h, ufdset+1))

				return -EFAULT;

			ufdset += 2;

			*fdset++ = h << 32 | l;

			nr -= 2;

		}

		if (odd)

			__get_user(*fdset, ufdset);

		if (odd && __get_user(*fdset, ufdset))

			return -EFAULT;

	} else {

		/* Tricky, must clear full unsigned long in the

		 * kernel fdset at the end, this makes sure that
@@ -1630,14 +1632,14 @@ int compat_get_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, 
}



static

void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,

int compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,

		      unsigned long *fdset)

{

	unsigned long odd;

	nr = ROUND_UP(nr, __COMPAT_NFDBITS);



	if (!ufdset)

		return;

		return 0;



	odd = nr & 1UL;

	nr &= ~1UL;
@@ -1645,13 +1647,14 @@ void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset, 
		unsigned long h, l;

		l = *fdset++;

		h = l >> 32;

		__put_user(l, ufdset);

		__put_user(h, ufdset+1);

		if (__put_user(l, ufdset) || __put_user(h, ufdset+1))

			return -EFAULT;

		ufdset += 2;

		nr -= 2;

	}

	if (odd)

		__put_user(*fdset, ufdset);

	if (odd && __put_user(*fdset, ufdset))

		return -EFAULT;

	return 0;

}
@@ -1726,10 +1729,10 @@ int compat_core_sys_select(int n, compat_ulong_t __user *inp, 
		ret = 0;

	}



	compat_set_fd_set(n, inp, fds.res_in);

	compat_set_fd_set(n, outp, fds.res_out);

	compat_set_fd_set(n, exp, fds.res_ex);



	if (compat_set_fd_set(n, inp, fds.res_in) ||

	    compat_set_fd_set(n, outp, fds.res_out) ||

	    compat_set_fd_set(n, exp, fds.res_ex))

		ret = -EFAULT;

out:

	kfree(bits);

out_nofds:

fs/compat_ioctl.c

+20 −13
Original line number Diff line number Diff line
@@ -211,8 +211,10 @@ static int do_video_stillpicture(unsigned int fd, unsigned int cmd, unsigned lon 
	up_native =

		compat_alloc_user_space(sizeof(struct video_still_picture));



	put_user(compat_ptr(fp), &up_native->iFrame);

	put_user(size, &up_native->size);

	err =  put_user(compat_ptr(fp), &up_native->iFrame);

	err |= put_user(size, &up_native->size);

	if (err)

		return -EFAULT;



	err = sys_ioctl(fd, cmd, (unsigned long) up_native);
@@ -236,8 +238,10 @@ static int do_video_set_spu_palette(unsigned int fd, unsigned int cmd, unsigned 
	err |= get_user(length, &up->length);



	up_native = compat_alloc_user_space(sizeof(struct video_spu_palette));

	put_user(compat_ptr(palp), &up_native->palette);

	put_user(length, &up_native->length);

	err  = put_user(compat_ptr(palp), &up_native->palette);

	err |= put_user(length, &up_native->length);

	if (err)

		return -EFAULT;



	err = sys_ioctl(fd, cmd, (unsigned long) up_native);
@@ -2043,16 +2047,19 @@ static int serial_struct_ioctl(unsigned fd, unsigned cmd, unsigned long arg) 
        struct serial_struct ss;

        mm_segment_t oldseg = get_fs();

        __u32 udata;

	unsigned int base;



        if (cmd == TIOCSSERIAL) {

                if (!access_ok(VERIFY_READ, ss32, sizeof(SS32)))

                        return -EFAULT;

                if (__copy_from_user(&ss, ss32, offsetof(SS32, iomem_base)))

			return -EFAULT;

                __get_user(udata, &ss32->iomem_base);

                if (__get_user(udata, &ss32->iomem_base))

			return -EFAULT;

                ss.iomem_base = compat_ptr(udata);

                __get_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift);

                __get_user(ss.port_high, &ss32->port_high);

                if (__get_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift) ||

		    __get_user(ss.port_high, &ss32->port_high))

			return -EFAULT;

                ss.iomap_base = 0UL;

        }

        set_fs(KERNEL_DS);
@@ -2063,12 +2070,12 @@ static int serial_struct_ioctl(unsigned fd, unsigned cmd, unsigned long arg) 
                        return -EFAULT;

                if (__copy_to_user(ss32,&ss,offsetof(SS32,iomem_base)))

			return -EFAULT;

                __put_user((unsigned long)ss.iomem_base  >> 32 ?

                            0xffffffff : (unsigned)(unsigned long)ss.iomem_base,

                            &ss32->iomem_base);

                __put_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift);

                __put_user(ss.port_high, &ss32->port_high);



		base = (unsigned long)ss.iomem_base  >> 32 ?

			0xffffffff : (unsigned)(unsigned long)ss.iomem_base;

		if (__put_user(base, &ss32->iomem_base) ||

		    __put_user(ss.iomem_reg_shift, &ss32->iomem_reg_shift) ||

		    __put_user(ss.port_high, &ss32->port_high))

			return -EFAULT;

        }

        return err;

}