From: Al Viro <viro@xxxxxxxxxxxxxxxxxx> RAW_SETBIND and RAW_GETBIND 32bit versions are fscked in interesting ways. 1) fs/compat_ioctl.c has COMPATIBLE_IOCTL(RAW_SETBIND) followed by HANDLE_IOCTL(RAW_SETBIND, raw_ioctl). The latter is ignored. 2) on amd64 (and itanic) the damn thing is broken - we have int + u64 + u64 and layouts on i386 and amd64 are _not_ the same. raw_ioctl() would work there, but it's never called due to (1). As it is, i386 /sbin/raw definitely doesn't work on amd64 boxen. 3) switching to raw_ioctl() as is would *not* work on e.g. sparc64 and ppc64, which would be rather sad, seeing that normal userland there is 32bit. The thing is, slapping __packed on the struct in question does not DTRT - it eliminates *all* padding. The real solution is to use compat_u64. 4) of course, all that stuff has no business being outside of raw.c in the first place - there should be ->compat_ioctl() for /dev/rawctl instead of messing with compat_ioctl.c. [akpm@xxxxxxxxxxxxxxxxxxxx: coding-style fixes] Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/char/raw.c | 227 ++++++++++++++++++++++++++----------------- fs/compat_ioctl.c | 73 ------------- 2 files changed, 138 insertions(+), 162 deletions(-) diff -puN drivers/char/raw.c~raw-fix-rawctl-compat-ioctls-breakage-on-amd64-and-itanic drivers/char/raw.c --- a/drivers/char/raw.c~raw-fix-rawctl-compat-ioctls-breakage-on-amd64-and-itanic +++ a/drivers/char/raw.c @@ -20,6 +20,7 @@ #include <linux/device.h> #include <linux/mutex.h> #include <linux/smp_lock.h> +#include <linux/compat.h> #include <asm/uaccess.h> @@ -129,11 +130,81 @@ raw_ioctl(struct inode *inode, struct fi return blkdev_ioctl(bdev, 0, command, arg); } -static void bind_device(struct raw_config_request *rq) +static int bind_set(int number, u64 major, u64 minor) { - device_destroy(raw_class, MKDEV(RAW_MAJOR, rq->raw_minor)); - device_create(raw_class, NULL, MKDEV(RAW_MAJOR, rq->raw_minor), NULL, - "raw%d", rq->raw_minor); + dev_t dev = MKDEV(major, minor); + struct raw_device_data *rawdev; + int err = 0; + + if (number <= 0 || number >= MAX_RAW_MINORS) + return -EINVAL; + + if (MAJOR(dev) != major || MINOR(dev) != minor) + return -EINVAL; + + rawdev = &raw_devices[number]; + + /* + * This is like making block devices, so demand the + * same capability + */ + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + /* + * For now, we don't need to check that the underlying + * block device is present or not: we can do that when + * the raw device is opened. Just check that the + * major/minor numbers make sense. + */ + + if (MAJOR(dev) == 0 && dev != 0) + return -EINVAL; + + mutex_lock(&raw_mutex); + if (rawdev->inuse) { + mutex_unlock(&raw_mutex); + return -EBUSY; + } + if (rawdev->binding) { + bdput(rawdev->binding); + module_put(THIS_MODULE); + } + if (!dev) { + /* unbind */ + rawdev->binding = NULL; + device_destroy(raw_class, MKDEV(RAW_MAJOR, number)); + } else { + rawdev->binding = bdget(dev); + if (rawdev->binding == NULL) { + err = -ENOMEM; + } else { + dev_t raw = MKDEV(RAW_MAJOR, number); + __module_get(THIS_MODULE); + device_destroy(raw_class, raw); + device_create(raw_class, NULL, raw, NULL, + "raw%d", number); + } + } + mutex_unlock(&raw_mutex); + return err; +} + +static int bind_get(int number, dev_t *dev) +{ + struct raw_device_data *rawdev; + struct block_device *bdev; + + if (number <= 0 || number >= MAX_RAW_MINORS) + return -EINVAL; + + rawdev = &raw_devices[number]; + + mutex_lock(&raw_mutex); + bdev = rawdev->binding; + *dev = bdev ? bdev->bd_dev : 0; + mutex_unlock(&raw_mutex); + return 0; } /* @@ -144,103 +215,78 @@ static int raw_ctl_ioctl(struct inode *i unsigned int command, unsigned long arg) { struct raw_config_request rq; - struct raw_device_data *rawdev; - int err = 0; + dev_t dev; + int err; switch (command) { case RAW_SETBIND: + if (copy_from_user(&rq, (void __user *) arg, sizeof(rq))) + return -EFAULT; + + return bind_set(rq.raw_minor, rq.block_major, rq.block_minor); + case RAW_GETBIND: + if (copy_from_user(&rq, (void __user *) arg, sizeof(rq))) + return -EFAULT; - /* First, find out which raw minor we want */ + err = bind_get(rq.raw_minor, &dev); + if (err) + return err; - if (copy_from_user(&rq, (void __user *) arg, sizeof(rq))) { - err = -EFAULT; - goto out; - } + rq.block_major = MAJOR(dev); + rq.block_minor = MINOR(dev); - if (rq.raw_minor <= 0 || rq.raw_minor >= MAX_RAW_MINORS) { - err = -EINVAL; - goto out; - } - rawdev = &raw_devices[rq.raw_minor]; + if (copy_to_user((void __user *)arg, &rq, sizeof(rq))) + return -EFAULT; - if (command == RAW_SETBIND) { - dev_t dev; + return 0; + } - /* - * This is like making block devices, so demand the - * same capability - */ - if (!capable(CAP_SYS_ADMIN)) { - err = -EPERM; - goto out; - } - - /* - * For now, we don't need to check that the underlying - * block device is present or not: we can do that when - * the raw device is opened. Just check that the - * major/minor numbers make sense. - */ - - dev = MKDEV(rq.block_major, rq.block_minor); - if ((rq.block_major == 0 && rq.block_minor != 0) || - MAJOR(dev) != rq.block_major || - MINOR(dev) != rq.block_minor) { - err = -EINVAL; - goto out; - } - - mutex_lock(&raw_mutex); - if (rawdev->inuse) { - mutex_unlock(&raw_mutex); - err = -EBUSY; - goto out; - } - if (rawdev->binding) { - bdput(rawdev->binding); - module_put(THIS_MODULE); - } - if (rq.block_major == 0 && rq.block_minor == 0) { - /* unbind */ - rawdev->binding = NULL; - device_destroy(raw_class, - MKDEV(RAW_MAJOR, rq.raw_minor)); - } else { - rawdev->binding = bdget(dev); - if (rawdev->binding == NULL) - err = -ENOMEM; - else { - __module_get(THIS_MODULE); - bind_device(&rq); - } - } - mutex_unlock(&raw_mutex); - } else { - struct block_device *bdev; + return -EINVAL; +} - mutex_lock(&raw_mutex); - bdev = rawdev->binding; - if (bdev) { - rq.block_major = MAJOR(bdev->bd_dev); - rq.block_minor = MINOR(bdev->bd_dev); - } else { - rq.block_major = rq.block_minor = 0; - } - mutex_unlock(&raw_mutex); - if (copy_to_user((void __user *)arg, &rq, sizeof(rq))) { - err = -EFAULT; - goto out; - } - } - break; - default: - err = -EINVAL; - break; +#ifdef CONFIG_COMPAT +struct raw32_config_request { + compat_int_t raw_minor; + compat_u64 block_major; + compat_u64 block_minor; +}; + +static long raw_ctl_compat_ioctl(struct file *file, unsigned int cmd, + unsigned long arg) +{ + struct raw32_config_request __user *user_req = compat_ptr(arg); + struct raw32_config_request rq; + dev_t dev; + int err = 0; + + switch (cmd) { + case RAW_SETBIND: + if (copy_from_user(&rq, user_req, sizeof(rq))) + return -EFAULT; + + return bind_set(rq.raw_minor, rq.block_major, rq.block_minor); + + case RAW_GETBIND: + if (copy_from_user(&rq, user_req, sizeof(rq))) + return -EFAULT; + + err = bind_get(rq.raw_minor, &dev); + if (err) + return err; + + rq.block_major = MAJOR(dev); + rq.block_minor = MINOR(dev); + + if (copy_to_user(user_req, &rq, sizeof(rq))) + return -EFAULT; + + return 0; } -out: - return err; + + return -EINVAL; } +#endif static const struct file_operations raw_fops = { .read = do_sync_read, @@ -255,6 +301,9 @@ static const struct file_operations raw_ static const struct file_operations raw_ctl_fops = { .ioctl = raw_ctl_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = raw_ctl_compat_ioctl, +#endif .open = raw_open, .owner = THIS_MODULE, }; diff -puN fs/compat_ioctl.c~raw-fix-rawctl-compat-ioctls-breakage-on-amd64-and-itanic fs/compat_ioctl.c --- a/fs/compat_ioctl.c~raw-fix-rawctl-compat-ioctls-breakage-on-amd64-and-itanic +++ a/fs/compat_ioctl.c @@ -1406,73 +1406,6 @@ static int ioc_settimeout(unsigned int f #define HIDPGETCONNLIST _IOR('H', 210, int) #define HIDPGETCONNINFO _IOR('H', 211, int) -#ifdef CONFIG_BLOCK -struct raw32_config_request -{ - compat_int_t raw_minor; - __u64 block_major; - __u64 block_minor; -} __attribute__((packed)); - -static int get_raw32_request(struct raw_config_request *req, struct raw32_config_request __user *user_req) -{ - int ret; - - if (!access_ok(VERIFY_READ, user_req, sizeof(struct raw32_config_request))) - return -EFAULT; - - ret = __get_user(req->raw_minor, &user_req->raw_minor); - ret |= __get_user(req->block_major, &user_req->block_major); - ret |= __get_user(req->block_minor, &user_req->block_minor); - - return ret ? -EFAULT : 0; -} - -static int set_raw32_request(struct raw_config_request *req, struct raw32_config_request __user *user_req) -{ - int ret; - - if (!access_ok(VERIFY_WRITE, user_req, sizeof(struct raw32_config_request))) - return -EFAULT; - - ret = __put_user(req->raw_minor, &user_req->raw_minor); - ret |= __put_user(req->block_major, &user_req->block_major); - ret |= __put_user(req->block_minor, &user_req->block_minor); - - return ret ? -EFAULT : 0; -} - -static int raw_ioctl(unsigned fd, unsigned cmd, unsigned long arg) -{ - int ret; - - switch (cmd) { - case RAW_SETBIND: - case RAW_GETBIND: { - struct raw_config_request req; - struct raw32_config_request __user *user_req = compat_ptr(arg); - mm_segment_t oldfs = get_fs(); - - if ((ret = get_raw32_request(&req, user_req))) - return ret; - - set_fs(KERNEL_DS); - ret = sys_ioctl(fd,cmd,(unsigned long)&req); - set_fs(oldfs); - - if ((!ret) && (cmd == RAW_GETBIND)) { - ret = set_raw32_request(&req, user_req); - } - break; - } - default: - ret = sys_ioctl(fd, cmd, arg); - break; - } - return ret; -} -#endif /* CONFIG_BLOCK */ - struct serial_struct32 { compat_int_t type; compat_int_t line; @@ -2306,9 +2239,6 @@ COMPATIBLE_IOCTL(AUTOFS_IOC_EXPIRE) COMPATIBLE_IOCTL(AUTOFS_IOC_EXPIRE_MULTI) COMPATIBLE_IOCTL(AUTOFS_IOC_PROTOSUBVER) COMPATIBLE_IOCTL(AUTOFS_IOC_ASKUMOUNT) -/* Raw devices */ -COMPATIBLE_IOCTL(RAW_SETBIND) -COMPATIBLE_IOCTL(RAW_GETBIND) /* SMB ioctls which do not need any translations */ COMPATIBLE_IOCTL(SMB_IOC_NEWCONN) /* Little a */ @@ -2642,9 +2572,6 @@ HANDLE_IOCTL(SONET_GETFRSENSE, do_atm_io #ifdef CONFIG_BLOCK /* loop */ IGNORE_IOCTL(LOOP_CLR_FD) -/* Raw devices */ -HANDLE_IOCTL(RAW_SETBIND, raw_ioctl) -HANDLE_IOCTL(RAW_GETBIND, raw_ioctl) #endif /* Serial */ HANDLE_IOCTL(TIOCGSERIAL, serial_struct_ioctl) _ -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html