Arnd Bergmann
2020-Jan-02 14:55 UTC
[PATCH v3 13/22] compat_ioctl: scsi: move ioctl handling into drivers
Each driver calling scsi_ioctl() gets an equivalent compat_ioctl() handler that implements the same commands by calling scsi_compat_ioctl(). The scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible at this point, so any driver that calls those can do so for both native and compat mode, with the argument passed through compat_ptr(). With this, we can remove the entries from fs/compat_ioctl.c. The new code is larger, but should be easier to maintain and keep updated with newly added commands. Signed-off-by: Arnd Bergmann <arnd at arndb.de> --- drivers/block/virtio_blk.c | 3 + drivers/scsi/ch.c | 9 ++- drivers/scsi/sd.c | 50 ++++++-------- drivers/scsi/sg.c | 44 ++++++++----- drivers/scsi/sr.c | 57 ++++++++++++++-- drivers/scsi/st.c | 51 ++++++++------ fs/compat_ioctl.c | 132 +------------------------------------ 7 files changed, 142 insertions(+), 204 deletions(-) diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c index 7ffd719d89de..fbbf18ac1d5d 100644 --- a/drivers/block/virtio_blk.c +++ b/drivers/block/virtio_blk.c @@ -405,6 +405,9 @@ static int virtblk_getgeo(struct block_device *bd, struct hd_geometry *geo) static const struct block_device_operations virtblk_fops = { .ioctl = virtblk_ioctl, +#ifdef CONFIG_COMPAT + .compat_ioctl = blkdev_compat_ptr_ioctl, +#endif .owner = THIS_MODULE, .getgeo = virtblk_getgeo, }; diff --git a/drivers/scsi/ch.c b/drivers/scsi/ch.c index 76751d6c7f0d..ed5f4a6ae270 100644 --- a/drivers/scsi/ch.c +++ b/drivers/scsi/ch.c @@ -872,6 +872,10 @@ static long ch_ioctl_compat(struct file * file, unsigned int cmd, unsigned long arg) { scsi_changer *ch = file->private_data; + int retval = scsi_ioctl_block_when_processing_errors(ch->device, cmd, + file->f_flags & O_NDELAY); + if (retval) + return retval; switch (cmd) { case CHIOGPARAMS: @@ -883,7 +887,7 @@ static long ch_ioctl_compat(struct file * file, case CHIOINITELEM: case CHIOSVOLTAG: /* compatible */ - return ch_ioctl(file, cmd, arg); + return ch_ioctl(file, cmd, (unsigned long)compat_ptr(arg)); case CHIOGSTATUS32: { struct changer_element_status32 ces32; @@ -898,8 +902,7 @@ static long ch_ioctl_compat(struct file * file, return ch_gstatus(ch, ces32.ces_type, data); } default: - // return scsi_ioctl_compat(ch->device, cmd, (void*)arg); - return -ENOIOCTLCMD; + return scsi_compat_ioctl(ch->device, cmd, compat_ptr(arg)); } } diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c index cea625906440..5afb0046b12a 100644 --- a/drivers/scsi/sd.c +++ b/drivers/scsi/sd.c @@ -1465,13 +1465,12 @@ static int sd_getgeo(struct block_device *bdev, struct hd_geometry *geo) * Note: most ioctls are forward onto the block subsystem or further * down in the scsi subsystem. **/ -static int sd_ioctl(struct block_device *bdev, fmode_t mode, - unsigned int cmd, unsigned long arg) +static int sd_ioctl_common(struct block_device *bdev, fmode_t mode, + unsigned int cmd, void __user *p) { struct gendisk *disk = bdev->bd_disk; struct scsi_disk *sdkp = scsi_disk(disk); struct scsi_device *sdp = sdkp->device; - void __user *p = (void __user *)arg; int error; SCSI_LOG_IOCTL(1, sd_printk(KERN_INFO, sdkp, "sd_ioctl: disk=%s, " @@ -1507,9 +1506,6 @@ static int sd_ioctl(struct block_device *bdev, fmode_t mode, break; default: error = scsi_cmd_blk_ioctl(bdev, mode, cmd, p); - if (error != -ENOTTY) - break; - error = scsi_ioctl(sdp, cmd, p); break; } out: @@ -1691,39 +1687,31 @@ static void sd_rescan(struct device *dev) revalidate_disk(sdkp->disk); } +static int sd_ioctl(struct block_device *bdev, fmode_t mode, + unsigned int cmd, unsigned long arg) +{ + void __user *p = (void __user *)arg; + int ret; + + ret = sd_ioctl_common(bdev, mode, cmd, p); + if (ret != -ENOTTY) + return ret; + + return scsi_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p); +} #ifdef CONFIG_COMPAT -/* - * This gets directly called from VFS. When the ioctl - * is not recognized we go back to the other translation paths. - */ static int sd_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned int cmd, unsigned long arg) { - struct gendisk *disk = bdev->bd_disk; - struct scsi_disk *sdkp = scsi_disk(disk); - struct scsi_device *sdev = sdkp->device; void __user *p = compat_ptr(arg); - int error; - - error = scsi_verify_blk_ioctl(bdev, cmd); - if (error < 0) - return error; + int ret; - error = scsi_ioctl_block_when_processing_errors(sdev, cmd, - (mode & FMODE_NDELAY) != 0); - if (error) - return error; + ret = sd_ioctl_common(bdev, mode, cmd, p); + if (ret != -ENOTTY) + return ret; - if (is_sed_ioctl(cmd)) - return sed_ioctl(sdkp->opal_dev, cmd, p); - - /* - * Let the static ioctl translation table take care of it. - */ - if (!sdev->host->hostt->compat_ioctl) - return -ENOIOCTLCMD; - return sdev->host->hostt->compat_ioctl(sdev, cmd, p); + return scsi_compat_ioctl(scsi_disk(bdev->bd_disk)->device, cmd, p); } #endif diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c index eace8886d95a..bafeaf7b9ad8 100644 --- a/drivers/scsi/sg.c +++ b/drivers/scsi/sg.c @@ -911,19 +911,14 @@ static int put_compat_request_table(struct compat_sg_req_info __user *o, #endif static long -sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) +sg_ioctl_common(struct file *filp, Sg_device *sdp, Sg_fd *sfp, + unsigned int cmd_in, void __user *p) { - void __user *p = (void __user *)arg; int __user *ip = p; int result, val, read_only; - Sg_device *sdp; - Sg_fd *sfp; Sg_request *srp; unsigned long iflags; - if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) - return -ENXIO; - SCSI_LOG_TIMEOUT(3, sg_printk(KERN_INFO, sdp, "sg_ioctl: cmd=0x%x\n", (int) cmd_in)); read_only = (O_RDWR != (filp->f_flags & O_ACCMODE)); @@ -1146,29 +1141,44 @@ sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) cmd_in, filp->f_flags & O_NDELAY); if (result) return result; + + return -ENOIOCTLCMD; +} + +static long +sg_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) +{ + void __user *p = (void __user *)arg; + Sg_device *sdp; + Sg_fd *sfp; + int ret; + + if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) + return -ENXIO; + + ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p); + if (ret != -ENOIOCTLCMD) + return ret; + return scsi_ioctl(sdp->device, cmd_in, p); } #ifdef CONFIG_COMPAT static long sg_compat_ioctl(struct file *filp, unsigned int cmd_in, unsigned long arg) { + void __user *p = compat_ptr(arg); Sg_device *sdp; Sg_fd *sfp; - struct scsi_device *sdev; + int ret; if ((!(sfp = (Sg_fd *) filp->private_data)) || (!(sdp = sfp->parentdp))) return -ENXIO; - sdev = sdp->device; - if (sdev->host->hostt->compat_ioctl) { - int ret; - - ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); - + ret = sg_ioctl_common(filp, sdp, sfp, cmd_in, p); + if (ret != -ENOIOCTLCMD) return ret; - } - - return -ENOIOCTLCMD; + + return scsi_compat_ioctl(sdp->device, cmd_in, p); } #endif diff --git a/drivers/scsi/sr.c b/drivers/scsi/sr.c index 4664fdf75c0f..6033a886c42c 100644 --- a/drivers/scsi/sr.c +++ b/drivers/scsi/sr.c @@ -38,6 +38,7 @@ #include <linux/kernel.h> #include <linux/mm.h> #include <linux/bio.h> +#include <linux/compat.h> #include <linux/string.h> #include <linux/errno.h> #include <linux/cdrom.h> @@ -598,6 +599,55 @@ static int sr_block_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, return ret; } +#ifdef CONFIG_COMPAT +static int sr_block_compat_ioctl(struct block_device *bdev, fmode_t mode, unsigned cmd, + unsigned long arg) +{ + struct scsi_cd *cd = scsi_cd(bdev->bd_disk); + struct scsi_device *sdev = cd->device; + void __user *argp = compat_ptr(arg); + int ret; + + mutex_lock(&sr_mutex); + + ret = scsi_ioctl_block_when_processing_errors(sdev, cmd, + (mode & FMODE_NDELAY) != 0); + if (ret) + goto out; + + scsi_autopm_get_device(sdev); + + /* + * Send SCSI addressing ioctls directly to mid level, send other + * ioctls to cdrom/block level. + */ + switch (cmd) { + case SCSI_IOCTL_GET_IDLUN: + case SCSI_IOCTL_GET_BUS_NUMBER: + ret = scsi_compat_ioctl(sdev, cmd, argp); + goto put; + } + + /* + * CDROM ioctls are handled in the block layer, but + * do the scsi blk ioctls here. + */ + ret = scsi_cmd_blk_ioctl(bdev, mode, cmd, argp); + if (ret != -ENOTTY) + return ret; + + ret = scsi_compat_ioctl(sdev, cmd, argp); + +put: + scsi_autopm_put_device(sdev); + +out: + mutex_unlock(&sr_mutex); + return ret; + +} +#endif + static unsigned int sr_block_check_events(struct gendisk *disk, unsigned int clearing) { @@ -641,12 +691,11 @@ static const struct block_device_operations sr_bdops .open = sr_block_open, .release = sr_block_release, .ioctl = sr_block_ioctl, +#ifdef CONFIG_COMPAT + .ioctl = sr_block_compat_ioctl, +#endif .check_events = sr_block_check_events, .revalidate_disk = sr_block_revalidate_disk, - /* - * No compat_ioctl for now because sr_block_ioctl never - * seems to pass arbitrary ioctls down to host drivers. - */ }; static int sr_open(struct cdrom_device_info *cdi, int purpose) diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index 9e3fff2de83e..393f3019ccac 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -3501,7 +3501,7 @@ static int partition_tape(struct scsi_tape *STp, int size) /* The ioctl command */ -static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) +static long st_ioctl_common(struct file *file, unsigned int cmd_in, void __user *p) { int i, cmd_nr, cmd_type, bt; int retval = 0; @@ -3509,7 +3509,6 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) struct scsi_tape *STp = file->private_data; struct st_modedef *STm; struct st_partstat *STps; - void __user *p = (void __user *)arg; if (mutex_lock_interruptible(&STp->lock)) return -ERESTARTSYS; @@ -3824,9 +3823,19 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) } mutex_unlock(&STp->lock); switch (cmd_in) { + case SCSI_IOCTL_STOP_UNIT: + /* unload */ + retval = scsi_ioctl(STp->device, cmd_in, p); + if (!retval) { + STp->rew_at_close = 0; + STp->ready = ST_NO_TAPE; + } + return retval; + case SCSI_IOCTL_GET_IDLUN: case SCSI_IOCTL_GET_BUS_NUMBER: break; + default: if ((cmd_in == SG_IO || cmd_in == SCSI_IOCTL_SEND_COMMAND || @@ -3840,42 +3849,46 @@ static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) return i; break; } - retval = scsi_ioctl(STp->device, cmd_in, p); - if (!retval && cmd_in == SCSI_IOCTL_STOP_UNIT) { /* unload */ - STp->rew_at_close = 0; - STp->ready = ST_NO_TAPE; - } - return retval; + return -ENOTTY; out: mutex_unlock(&STp->lock); return retval; } +static long st_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) +{ + void __user *p = (void __user *)arg; + struct scsi_tape *STp = file->private_data; + int ret; + + ret = st_ioctl_common(file, cmd_in, p); + if (ret != -ENOTTY) + return ret; + + return scsi_ioctl(STp->device, cmd_in, p); +} + #ifdef CONFIG_COMPAT static long st_compat_ioctl(struct file *file, unsigned int cmd_in, unsigned long arg) { void __user *p = compat_ptr(arg); struct scsi_tape *STp = file->private_data; - struct scsi_device *sdev = STp->device; - int ret = -ENOIOCTLCMD; + int ret; /* argument conversion is handled using put_user_mtpos/put_user_mtget */ switch (cmd_in) { - case MTIOCTOP: - return st_ioctl(file, MTIOCTOP, (unsigned long)p); case MTIOCPOS32: - return st_ioctl(file, MTIOCPOS, (unsigned long)p); + return st_ioctl_common(file, MTIOCPOS, p); case MTIOCGET32: - return st_ioctl(file, MTIOCGET, (unsigned long)p); + return st_ioctl_common(file, MTIOCGET, p); } - if (sdev->host->hostt->compat_ioctl) { + ret = st_ioctl_common(file, cmd_in, p); + if (ret != -ENOTTY) + return ret; - ret = sdev->host->hostt->compat_ioctl(sdev, cmd_in, (void __user *)arg); - - } - return ret; + return scsi_compat_ioctl(STp->device, cmd_in, p); } #endif diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c index 358ea2ecf36b..ab4471f469e6 100644 --- a/fs/compat_ioctl.c +++ b/fs/compat_ioctl.c @@ -36,109 +36,11 @@ #include "internal.h" -#ifdef CONFIG_BLOCK -#include <linux/cdrom.h> -#include <linux/fd.h> -#include <scsi/scsi.h> -#include <scsi/scsi_ioctl.h> -#include <scsi/sg.h> -#endif - #include <linux/uaccess.h> #include <linux/watchdog.h> #include <linux/hiddev.h> - -#include <linux/sort.h> - -/* - * simple reversible transform to make our table more evenly - * distributed after sorting. - */ -#define XFORM(i) (((i) ^ ((i) << 27) ^ ((i) << 17)) & 0xffffffff) - -#define COMPATIBLE_IOCTL(cmd) XFORM((u32)cmd), -static unsigned int ioctl_pointer[] = { -#ifdef CONFIG_BLOCK -/* Big S */ -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN) -COMPATIBLE_IOCTL(SCSI_IOCTL_DOORLOCK) -COMPATIBLE_IOCTL(SCSI_IOCTL_DOORUNLOCK) -COMPATIBLE_IOCTL(SCSI_IOCTL_TEST_UNIT_READY) -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_BUS_NUMBER) -COMPATIBLE_IOCTL(SCSI_IOCTL_SEND_COMMAND) -COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST) -COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI) -#endif -#ifdef CONFIG_BLOCK -/* SG stuff */ -COMPATIBLE_IOCTL(SG_IO) -COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE) -COMPATIBLE_IOCTL(SG_SET_TIMEOUT) -COMPATIBLE_IOCTL(SG_GET_TIMEOUT) -COMPATIBLE_IOCTL(SG_EMULATED_HOST) -COMPATIBLE_IOCTL(SG_GET_TRANSFORM) -COMPATIBLE_IOCTL(SG_SET_RESERVED_SIZE) -COMPATIBLE_IOCTL(SG_GET_RESERVED_SIZE) -COMPATIBLE_IOCTL(SG_GET_SCSI_ID) -COMPATIBLE_IOCTL(SG_SET_FORCE_LOW_DMA) -COMPATIBLE_IOCTL(SG_GET_LOW_DMA) -COMPATIBLE_IOCTL(SG_SET_FORCE_PACK_ID) -COMPATIBLE_IOCTL(SG_GET_PACK_ID) -COMPATIBLE_IOCTL(SG_GET_NUM_WAITING) -COMPATIBLE_IOCTL(SG_SET_DEBUG) -COMPATIBLE_IOCTL(SG_GET_SG_TABLESIZE) -COMPATIBLE_IOCTL(SG_GET_COMMAND_Q) -COMPATIBLE_IOCTL(SG_SET_COMMAND_Q) -COMPATIBLE_IOCTL(SG_GET_VERSION_NUM) -COMPATIBLE_IOCTL(SG_NEXT_CMD_LEN) -COMPATIBLE_IOCTL(SG_SCSI_RESET) -COMPATIBLE_IOCTL(SG_GET_REQUEST_TABLE) -COMPATIBLE_IOCTL(SG_SET_KEEP_ORPHAN) -COMPATIBLE_IOCTL(SG_GET_KEEP_ORPHAN) -#endif -}; - -/* - * Convert common ioctl arguments based on their command number - * - * Please do not add any code in here. Instead, implement - * a compat_ioctl operation in the place that handle? the - * ioctl for the native case. - */ -static long do_ioctl_trans(unsigned int cmd, - unsigned long arg, struct file *file) -{ - return -ENOIOCTLCMD; -} - -static int compat_ioctl_check_table(unsigned int xcmd) -{ -#ifdef CONFIG_BLOCK - int i; - const int max = ARRAY_SIZE(ioctl_pointer) - 1; - - BUILD_BUG_ON(max >= (1 << 16)); - - /* guess initial offset into table, assuming a - normalized distribution */ - i = ((xcmd >> 16) * max) >> 16; - - /* do linear search up first, until greater or equal */ - while (ioctl_pointer[i] < xcmd && i < max) - i++; - - /* then do linear search down */ - while (ioctl_pointer[i] > xcmd && i > 0) - i--; - - return ioctl_pointer[i] == xcmd; -#else - return 0; -#endif -} - COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, compat_ulong_t, arg32) { @@ -216,19 +118,9 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, goto out_fput; } - if (!f.file->f_op->unlocked_ioctl) - goto do_ioctl; - break; - } - - if (compat_ioctl_check_table(XFORM(cmd))) - goto found_handler; - - error = do_ioctl_trans(cmd, arg, f.file); - if (error == -ENOIOCTLCMD) error = -ENOTTY; - - goto out_fput; + goto out_fput; + } found_handler: arg = (unsigned long)compat_ptr(arg); @@ -239,23 +131,3 @@ COMPAT_SYSCALL_DEFINE3(ioctl, unsigned int, fd, unsigned int, cmd, out: return error; } - -static int __init init_sys32_ioctl_cmp(const void *p, const void *q) -{ - unsigned int a, b; - a = *(unsigned int *)p; - b = *(unsigned int *)q; - if (a > b) - return 1; - if (a < b) - return -1; - return 0; -} - -static int __init init_sys32_ioctl(void) -{ - sort(ioctl_pointer, ARRAY_SIZE(ioctl_pointer), sizeof(*ioctl_pointer), - init_sys32_ioctl_cmp, NULL); - return 0; -} -__initcall(init_sys32_ioctl); -- 2.20.0
Stefan Hajnoczi
2020-Jan-02 16:33 UTC
[PATCH v3 13/22] compat_ioctl: scsi: move ioctl handling into drivers
On Thu, Jan 02, 2020 at 03:55:31PM +0100, Arnd Bergmann wrote:> Each driver calling scsi_ioctl() gets an equivalent compat_ioctl() > handler that implements the same commands by calling scsi_compat_ioctl(). > > The scsi_cmd_ioctl() and scsi_cmd_blk_ioctl() functions are compatible > at this point, so any driver that calls those can do so for both native > and compat mode, with the argument passed through compat_ptr(). > > With this, we can remove the entries from fs/compat_ioctl.c. The new > code is larger, but should be easier to maintain and keep updated with > newly added commands. > > Signed-off-by: Arnd Bergmann <arnd at arndb.de> > --- > drivers/block/virtio_blk.c | 3 + > drivers/scsi/ch.c | 9 ++- > drivers/scsi/sd.c | 50 ++++++-------- > drivers/scsi/sg.c | 44 ++++++++----- > drivers/scsi/sr.c | 57 ++++++++++++++-- > drivers/scsi/st.c | 51 ++++++++------ > fs/compat_ioctl.c | 132 +------------------------------------ > 7 files changed, 142 insertions(+), 204 deletions(-)virtio_blk.c changes: Acked-by: Stefan Hajnoczi <stefanha at redhat.com> -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 488 bytes Desc: not available URL: <http://lists.linuxfoundation.org/pipermail/virtualization/attachments/20200102/d980c15f/attachment.sig>
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