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author | Al Viro <viro@zeniv.linux.org.uk> | 2017-09-20 01:02:27 -0400 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-09-20 01:02:27 -0400 |
commit | 7d5cb45655f2e9e37ef75d18f50c0072ef14a38b (patch) | |
tree | 7d9c9c588704dc338b8dbdd2482bd99df0558d2c /drivers/i2c | |
parent | abca5fc535a3ee0f36fb6d4468a453eaae769921 (diff) | |
download | linux-stable-7d5cb45655f2e9e37ef75d18f50c0072ef14a38b.tar.gz linux-stable-7d5cb45655f2e9e37ef75d18f50c0072ef14a38b.tar.bz2 linux-stable-7d5cb45655f2e9e37ef75d18f50c0072ef14a38b.zip |
i2c compat ioctls: move to ->compat_ioctl()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'drivers/i2c')
-rw-r--r-- | drivers/i2c/i2c-dev.c | 268 |
1 files changed, 180 insertions, 88 deletions
diff --git a/drivers/i2c/i2c-dev.c b/drivers/i2c/i2c-dev.c index 6f638bbc922d..2cab27a68479 100644 --- a/drivers/i2c/i2c-dev.c +++ b/drivers/i2c/i2c-dev.c @@ -35,6 +35,7 @@ #include <linux/notifier.h> #include <linux/slab.h> #include <linux/uaccess.h> +#include <linux/compat.h> /* * An i2c_dev represents an i2c_adapter ... an I2C or SMBus master, not a @@ -238,46 +239,29 @@ static int i2cdev_check_addr(struct i2c_adapter *adapter, unsigned int addr) } static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client, - unsigned long arg) + unsigned nmsgs, struct i2c_msg *msgs) { - struct i2c_rdwr_ioctl_data rdwr_arg; - struct i2c_msg *rdwr_pa; u8 __user **data_ptrs; int i, res; - if (copy_from_user(&rdwr_arg, - (struct i2c_rdwr_ioctl_data __user *)arg, - sizeof(rdwr_arg))) - return -EFAULT; - - /* Put an arbitrary limit on the number of messages that can - * be sent at once */ - if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS) - return -EINVAL; - - rdwr_pa = memdup_user(rdwr_arg.msgs, - rdwr_arg.nmsgs * sizeof(struct i2c_msg)); - if (IS_ERR(rdwr_pa)) - return PTR_ERR(rdwr_pa); - - data_ptrs = kmalloc(rdwr_arg.nmsgs * sizeof(u8 __user *), GFP_KERNEL); + data_ptrs = kmalloc(nmsgs * sizeof(u8 __user *), GFP_KERNEL); if (data_ptrs == NULL) { - kfree(rdwr_pa); + kfree(msgs); return -ENOMEM; } res = 0; - for (i = 0; i < rdwr_arg.nmsgs; i++) { + for (i = 0; i < nmsgs; i++) { /* Limit the size of the message to a sane amount */ - if (rdwr_pa[i].len > 8192) { + if (msgs[i].len > 8192) { res = -EINVAL; break; } - data_ptrs[i] = (u8 __user *)rdwr_pa[i].buf; - rdwr_pa[i].buf = memdup_user(data_ptrs[i], rdwr_pa[i].len); - if (IS_ERR(rdwr_pa[i].buf)) { - res = PTR_ERR(rdwr_pa[i].buf); + data_ptrs[i] = (u8 __user *)msgs[i].buf; + msgs[i].buf = memdup_user(data_ptrs[i], msgs[i].len); + if (IS_ERR(msgs[i].buf)) { + res = PTR_ERR(msgs[i].buf); break; } @@ -292,121 +276,117 @@ static noinline int i2cdev_ioctl_rdwr(struct i2c_client *client, * greater (for example to account for a checksum byte at * the end of the message.) */ - if (rdwr_pa[i].flags & I2C_M_RECV_LEN) { - if (!(rdwr_pa[i].flags & I2C_M_RD) || - rdwr_pa[i].buf[0] < 1 || - rdwr_pa[i].len < rdwr_pa[i].buf[0] + + if (msgs[i].flags & I2C_M_RECV_LEN) { + if (!(msgs[i].flags & I2C_M_RD) || + msgs[i].buf[0] < 1 || + msgs[i].len < msgs[i].buf[0] + I2C_SMBUS_BLOCK_MAX) { res = -EINVAL; break; } - rdwr_pa[i].len = rdwr_pa[i].buf[0]; + msgs[i].len = msgs[i].buf[0]; } } if (res < 0) { int j; for (j = 0; j < i; ++j) - kfree(rdwr_pa[j].buf); + kfree(msgs[j].buf); kfree(data_ptrs); - kfree(rdwr_pa); + kfree(msgs); return res; } - res = i2c_transfer(client->adapter, rdwr_pa, rdwr_arg.nmsgs); + res = i2c_transfer(client->adapter, msgs, nmsgs); while (i-- > 0) { - if (res >= 0 && (rdwr_pa[i].flags & I2C_M_RD)) { - if (copy_to_user(data_ptrs[i], rdwr_pa[i].buf, - rdwr_pa[i].len)) + if (res >= 0 && (msgs[i].flags & I2C_M_RD)) { + if (copy_to_user(data_ptrs[i], msgs[i].buf, + msgs[i].len)) res = -EFAULT; } - kfree(rdwr_pa[i].buf); + kfree(msgs[i].buf); } kfree(data_ptrs); - kfree(rdwr_pa); + kfree(msgs); return res; } static noinline int i2cdev_ioctl_smbus(struct i2c_client *client, - unsigned long arg) + u8 read_write, u8 command, u32 size, + union i2c_smbus_data __user *data) { - struct i2c_smbus_ioctl_data data_arg; union i2c_smbus_data temp = {}; int datasize, res; - if (copy_from_user(&data_arg, - (struct i2c_smbus_ioctl_data __user *) arg, - sizeof(struct i2c_smbus_ioctl_data))) - return -EFAULT; - if ((data_arg.size != I2C_SMBUS_BYTE) && - (data_arg.size != I2C_SMBUS_QUICK) && - (data_arg.size != I2C_SMBUS_BYTE_DATA) && - (data_arg.size != I2C_SMBUS_WORD_DATA) && - (data_arg.size != I2C_SMBUS_PROC_CALL) && - (data_arg.size != I2C_SMBUS_BLOCK_DATA) && - (data_arg.size != I2C_SMBUS_I2C_BLOCK_BROKEN) && - (data_arg.size != I2C_SMBUS_I2C_BLOCK_DATA) && - (data_arg.size != I2C_SMBUS_BLOCK_PROC_CALL)) { + if ((size != I2C_SMBUS_BYTE) && + (size != I2C_SMBUS_QUICK) && + (size != I2C_SMBUS_BYTE_DATA) && + (size != I2C_SMBUS_WORD_DATA) && + (size != I2C_SMBUS_PROC_CALL) && + (size != I2C_SMBUS_BLOCK_DATA) && + (size != I2C_SMBUS_I2C_BLOCK_BROKEN) && + (size != I2C_SMBUS_I2C_BLOCK_DATA) && + (size != I2C_SMBUS_BLOCK_PROC_CALL)) { dev_dbg(&client->adapter->dev, "size out of range (%x) in ioctl I2C_SMBUS.\n", - data_arg.size); + size); return -EINVAL; } /* Note that I2C_SMBUS_READ and I2C_SMBUS_WRITE are 0 and 1, so the check is valid if size==I2C_SMBUS_QUICK too. */ - if ((data_arg.read_write != I2C_SMBUS_READ) && - (data_arg.read_write != I2C_SMBUS_WRITE)) { + if ((read_write != I2C_SMBUS_READ) && + (read_write != I2C_SMBUS_WRITE)) { dev_dbg(&client->adapter->dev, "read_write out of range (%x) in ioctl I2C_SMBUS.\n", - data_arg.read_write); + read_write); return -EINVAL; } /* Note that command values are always valid! */ - if ((data_arg.size == I2C_SMBUS_QUICK) || - ((data_arg.size == I2C_SMBUS_BYTE) && - (data_arg.read_write == I2C_SMBUS_WRITE))) + if ((size == I2C_SMBUS_QUICK) || + ((size == I2C_SMBUS_BYTE) && + (read_write == I2C_SMBUS_WRITE))) /* These are special: we do not use data */ return i2c_smbus_xfer(client->adapter, client->addr, - client->flags, data_arg.read_write, - data_arg.command, data_arg.size, NULL); + client->flags, read_write, + command, size, NULL); - if (data_arg.data == NULL) { + if (data == NULL) { dev_dbg(&client->adapter->dev, "data is NULL pointer in ioctl I2C_SMBUS.\n"); return -EINVAL; } - if ((data_arg.size == I2C_SMBUS_BYTE_DATA) || - (data_arg.size == I2C_SMBUS_BYTE)) - datasize = sizeof(data_arg.data->byte); - else if ((data_arg.size == I2C_SMBUS_WORD_DATA) || - (data_arg.size == I2C_SMBUS_PROC_CALL)) - datasize = sizeof(data_arg.data->word); + if ((size == I2C_SMBUS_BYTE_DATA) || + (size == I2C_SMBUS_BYTE)) + datasize = sizeof(data->byte); + else if ((size == I2C_SMBUS_WORD_DATA) || + (size == I2C_SMBUS_PROC_CALL)) + datasize = sizeof(data->word); else /* size == smbus block, i2c block, or block proc. call */ - datasize = sizeof(data_arg.data->block); + datasize = sizeof(data->block); - if ((data_arg.size == I2C_SMBUS_PROC_CALL) || - (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || - (data_arg.size == I2C_SMBUS_I2C_BLOCK_DATA) || - (data_arg.read_write == I2C_SMBUS_WRITE)) { - if (copy_from_user(&temp, data_arg.data, datasize)) + if ((size == I2C_SMBUS_PROC_CALL) || + (size == I2C_SMBUS_BLOCK_PROC_CALL) || + (size == I2C_SMBUS_I2C_BLOCK_DATA) || + (read_write == I2C_SMBUS_WRITE)) { + if (copy_from_user(&temp, data, datasize)) return -EFAULT; } - if (data_arg.size == I2C_SMBUS_I2C_BLOCK_BROKEN) { + if (size == I2C_SMBUS_I2C_BLOCK_BROKEN) { /* Convert old I2C block commands to the new convention. This preserves binary compatibility. */ - data_arg.size = I2C_SMBUS_I2C_BLOCK_DATA; - if (data_arg.read_write == I2C_SMBUS_READ) + size = I2C_SMBUS_I2C_BLOCK_DATA; + if (read_write == I2C_SMBUS_READ) temp.block[0] = I2C_SMBUS_BLOCK_MAX; } res = i2c_smbus_xfer(client->adapter, client->addr, client->flags, - data_arg.read_write, data_arg.command, data_arg.size, &temp); - if (!res && ((data_arg.size == I2C_SMBUS_PROC_CALL) || - (data_arg.size == I2C_SMBUS_BLOCK_PROC_CALL) || - (data_arg.read_write == I2C_SMBUS_READ))) { - if (copy_to_user(data_arg.data, &temp, datasize)) + read_write, command, size, &temp); + if (!res && ((size == I2C_SMBUS_PROC_CALL) || + (size == I2C_SMBUS_BLOCK_PROC_CALL) || + (read_write == I2C_SMBUS_READ))) { + if (copy_to_user(data, &temp, datasize)) return -EFAULT; } return res; @@ -454,12 +434,39 @@ static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) funcs = i2c_get_functionality(client->adapter); return put_user(funcs, (unsigned long __user *)arg); - case I2C_RDWR: - return i2cdev_ioctl_rdwr(client, arg); + case I2C_RDWR: { + struct i2c_rdwr_ioctl_data rdwr_arg; + struct i2c_msg *rdwr_pa; + + if (copy_from_user(&rdwr_arg, + (struct i2c_rdwr_ioctl_data __user *)arg, + sizeof(rdwr_arg))) + return -EFAULT; + + /* Put an arbitrary limit on the number of messages that can + * be sent at once */ + if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS) + return -EINVAL; - case I2C_SMBUS: - return i2cdev_ioctl_smbus(client, arg); + rdwr_pa = memdup_user(rdwr_arg.msgs, + rdwr_arg.nmsgs * sizeof(struct i2c_msg)); + if (IS_ERR(rdwr_pa)) + return PTR_ERR(rdwr_pa); + + return i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa); + } + case I2C_SMBUS: { + struct i2c_smbus_ioctl_data data_arg; + if (copy_from_user(&data_arg, + (struct i2c_smbus_ioctl_data __user *) arg, + sizeof(struct i2c_smbus_ioctl_data))) + return -EFAULT; + return i2cdev_ioctl_smbus(client, data_arg.read_write, + data_arg.command, + data_arg.size, + data_arg.data); + } case I2C_RETRIES: client->adapter->retries = arg; break; @@ -480,6 +487,90 @@ static long i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) return 0; } +#ifdef CONFIG_COMPAT + +struct i2c_smbus_ioctl_data32 { + u8 read_write; + u8 command; + u32 size; + compat_caddr_t data; /* union i2c_smbus_data *data */ +}; + +struct i2c_msg32 { + u16 addr; + u16 flags; + u16 len; + compat_caddr_t buf; +}; + +struct i2c_rdwr_ioctl_data32 { + compat_caddr_t msgs; /* struct i2c_msg __user *msgs */ + u32 nmsgs; +}; + +static long compat_i2cdev_ioctl(struct file *file, unsigned int cmd, unsigned long arg) +{ + struct i2c_client *client = file->private_data; + unsigned long funcs; + switch (cmd) { + case I2C_FUNCS: + funcs = i2c_get_functionality(client->adapter); + return put_user(funcs, (compat_ulong_t __user *)arg); + case I2C_RDWR: { + struct i2c_rdwr_ioctl_data32 rdwr_arg; + struct i2c_msg32 *p; + struct i2c_msg *rdwr_pa; + int i; + + if (copy_from_user(&rdwr_arg, + (struct i2c_rdwr_ioctl_data32 __user *)arg, + sizeof(rdwr_arg))) + return -EFAULT; + + if (rdwr_arg.nmsgs > I2C_RDWR_IOCTL_MAX_MSGS) + return -EINVAL; + + rdwr_pa = kmalloc_array(rdwr_arg.nmsgs, sizeof(struct i2c_msg), + GFP_KERNEL); + if (!rdwr_pa) + return -ENOMEM; + + p = compat_ptr(rdwr_arg.msgs); + for (i = 0; i < rdwr_arg.nmsgs; i++) { + struct i2c_msg32 umsg; + if (copy_from_user(&umsg, p + i, sizeof(umsg))) { + kfree(rdwr_pa); + return -EFAULT; + } + rdwr_pa[i] = (struct i2c_msg) { + .addr = umsg.addr, + .flags = umsg.flags, + .len = umsg.len, + .buf = compat_ptr(umsg.buf) + }; + } + + return i2cdev_ioctl_rdwr(client, rdwr_arg.nmsgs, rdwr_pa); + } + case I2C_SMBUS: { + struct i2c_smbus_ioctl_data32 data32; + if (copy_from_user(&data32, + (void __user *) arg, + sizeof(data32))) + return -EFAULT; + return i2cdev_ioctl_smbus(client, data32.read_write, + data32.command, + data32.size, + compat_ptr(data32.data)); + } + default: + return i2cdev_ioctl(file, cmd, arg); + } +} +#else +#define compat_i2cdev_ioctl NULL +#endif + static int i2cdev_open(struct inode *inode, struct file *file) { unsigned int minor = iminor(inode); @@ -527,6 +618,7 @@ static const struct file_operations i2cdev_fops = { .read = i2cdev_read, .write = i2cdev_write, .unlocked_ioctl = i2cdev_ioctl, + .compat_ioctl = compat_i2cdev_ioctl, .open = i2cdev_open, .release = i2cdev_release, }; |