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Subject[PATCH 7/8] kthread: avoid parsing names as format strings
Date
Calling kthread_run with a single name parameter causes it to be handled
as a format string. Many callers are passing potentially dynamic string
content, so use "%s" in those cases to avoid any potential accidents.

Signed-off-by: Kees Cook <keescook@chromium.org>
---
drivers/block/aoe/aoecmd.c | 2 +-
drivers/block/mtip32xx/mtip32xx.c | 3 ++-
drivers/block/xen-blkback/xenbus.c | 2 +-
drivers/hwmon/adt7470.c | 2 +-
drivers/media/i2c/tvaudio.c | 3 ++-
drivers/media/pci/ivtv/ivtv-driver.c | 2 +-
drivers/media/platform/vivi.c | 3 ++-
drivers/mtd/ubi/build.c | 2 +-
drivers/net/wireless/airo.c | 3 ++-
drivers/scsi/aacraid/commctrl.c | 3 ++-
drivers/scsi/aacraid/commsup.c | 3 ++-
drivers/spi/spi.c | 2 +-
drivers/staging/rtl8712/os_intfs.c | 2 +-
drivers/usb/atm/usbatm.c | 5 +++--
fs/lockd/svc.c | 2 +-
fs/nfs/callback.c | 5 ++---
fs/nfs/nfs4state.c | 2 +-
kernel/rcutree.c | 2 +-
net/sunrpc/svc.c | 2 +-
19 files changed, 28 insertions(+), 22 deletions(-)

diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c
index fc803ec..b75c7db 100644
--- a/drivers/block/aoe/aoecmd.c
+++ b/drivers/block/aoe/aoecmd.c
@@ -1340,7 +1340,7 @@ aoe_ktstart(struct ktstate *k)
struct task_struct *task;

init_completion(&k->rendez);
- task = kthread_run(kthread, k, k->name);
+ task = kthread_run(kthread, k, "%s", k->name);
if (task == NULL || IS_ERR(task))
return -ENOMEM;
k->task = task;
diff --git a/drivers/block/mtip32xx/mtip32xx.c b/drivers/block/mtip32xx/mtip32xx.c
index 847107e..81ce4c0 100644
--- a/drivers/block/mtip32xx/mtip32xx.c
+++ b/drivers/block/mtip32xx/mtip32xx.c
@@ -4085,7 +4085,8 @@ skip_create_disk:
start_service_thread:
sprintf(thd_name, "mtip_svc_thd_%02d", index);
dd->mtip_svc_handler = kthread_create_on_node(mtip_service_thread,
- dd, dd->numa_node, thd_name);
+ dd, dd->numa_node, "%s",
+ thd_name);

if (IS_ERR(dd->mtip_svc_handler)) {
dev_err(&dd->pdev->dev, "service thread failed to start\n");
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index 8bfd1bc..04608a6 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -93,7 +93,7 @@ static void xen_update_blkif_status(struct xen_blkif *blkif)
}
invalidate_inode_pages2(blkif->vbd.bdev->bd_inode->i_mapping);

- blkif->xenblkd = kthread_run(xen_blkif_schedule, blkif, name);
+ blkif->xenblkd = kthread_run(xen_blkif_schedule, blkif, "%s", name);
if (IS_ERR(blkif->xenblkd)) {
err = PTR_ERR(blkif->xenblkd);
blkif->xenblkd = NULL;
diff --git a/drivers/hwmon/adt7470.c b/drivers/hwmon/adt7470.c
index b83bf4b..0f34bca 100644
--- a/drivers/hwmon/adt7470.c
+++ b/drivers/hwmon/adt7470.c
@@ -1285,7 +1285,7 @@ static int adt7470_probe(struct i2c_client *client,
}

init_completion(&data->auto_update_stop);
- data->auto_update = kthread_run(adt7470_update_thread, client,
+ data->auto_update = kthread_run(adt7470_update_thread, client, "%s",
dev_name(data->hwmon_dev));
if (IS_ERR(data->auto_update)) {
err = PTR_ERR(data->auto_update);
diff --git a/drivers/media/i2c/tvaudio.c b/drivers/media/i2c/tvaudio.c
index b72a59d..e0634c8 100644
--- a/drivers/media/i2c/tvaudio.c
+++ b/drivers/media/i2c/tvaudio.c
@@ -2020,7 +2020,8 @@ static int tvaudio_probe(struct i2c_client *client, const struct i2c_device_id *
/* start async thread */
chip->wt.function = chip_thread_wake;
chip->wt.data = (unsigned long)chip;
- chip->thread = kthread_run(chip_thread, chip, client->name);
+ chip->thread = kthread_run(chip_thread, chip, "%s",
+ client->name);
if (IS_ERR(chip->thread)) {
v4l2_warn(sd, "failed to create kthread\n");
chip->thread = NULL;
diff --git a/drivers/media/pci/ivtv/ivtv-driver.c b/drivers/media/pci/ivtv/ivtv-driver.c
index 07b8460..b809bc8 100644
--- a/drivers/media/pci/ivtv/ivtv-driver.c
+++ b/drivers/media/pci/ivtv/ivtv-driver.c
@@ -753,7 +753,7 @@ static int ivtv_init_struct1(struct ivtv *itv)

init_kthread_worker(&itv->irq_worker);
itv->irq_worker_task = kthread_run(kthread_worker_fn, &itv->irq_worker,
- itv->v4l2_dev.name);
+ "%s", itv->v4l2_dev.name);
if (IS_ERR(itv->irq_worker_task)) {
IVTV_ERR("Could not create ivtv task\n");
return -1;
diff --git a/drivers/media/platform/vivi.c b/drivers/media/platform/vivi.c
index 85bc314..1d3f119 100644
--- a/drivers/media/platform/vivi.c
+++ b/drivers/media/platform/vivi.c
@@ -768,7 +768,8 @@ static int vivi_start_generating(struct vivi_dev *dev)

dma_q->frame = 0;
dma_q->ini_jiffies = jiffies;
- dma_q->kthread = kthread_run(vivi_thread, dev, dev->v4l2_dev.name);
+ dma_q->kthread = kthread_run(vivi_thread, dev, "%s",
+ dev->v4l2_dev.name);

if (IS_ERR(dma_q->kthread)) {
v4l2_err(&dev->v4l2_dev, "kernel_thread() failed\n");
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index a561335..0aaece9 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -1005,7 +1005,7 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
if (err)
goto out_uif;

- ubi->bgt_thread = kthread_create(ubi_thread, ubi, ubi->bgt_name);
+ ubi->bgt_thread = kthread_create(ubi_thread, ubi, "%s", ubi->bgt_name);
if (IS_ERR(ubi->bgt_thread)) {
err = PTR_ERR(ubi->bgt_thread);
ubi_err("cannot spawn \"%s\", error %d", ubi->bgt_name,
diff --git a/drivers/net/wireless/airo.c b/drivers/net/wireless/airo.c
index 6125adb..d0adbaf 100644
--- a/drivers/net/wireless/airo.c
+++ b/drivers/net/wireless/airo.c
@@ -1893,7 +1893,8 @@ static int airo_open(struct net_device *dev) {

if (ai->wifidev != dev) {
clear_bit(JOB_DIE, &ai->jobs);
- ai->airo_thread_task = kthread_run(airo_thread, dev, dev->name);
+ ai->airo_thread_task = kthread_run(airo_thread, dev, "%s",
+ dev->name);
if (IS_ERR(ai->airo_thread_task))
return (int)PTR_ERR(ai->airo_thread_task);

diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 1ef041b..d85ac1a 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -318,7 +318,8 @@ return_fib:
kthread_stop(dev->thread);
ssleep(1);
dev->aif_thread = 0;
- dev->thread = kthread_run(aac_command_thread, dev, dev->name);
+ dev->thread = kthread_run(aac_command_thread, dev,
+ "%s", dev->name);
ssleep(1);
}
if (f.wait) {
diff --git a/drivers/scsi/aacraid/commsup.c b/drivers/scsi/aacraid/commsup.c
index 1be0776..cab190a 100644
--- a/drivers/scsi/aacraid/commsup.c
+++ b/drivers/scsi/aacraid/commsup.c
@@ -1336,7 +1336,8 @@ static int _aac_reset_adapter(struct aac_dev *aac, int forced)
if ((retval = pci_set_dma_mask(aac->pdev, DMA_BIT_MASK(32))))
goto out;
if (jafo) {
- aac->thread = kthread_run(aac_command_thread, aac, aac->name);
+ aac->thread = kthread_run(aac_command_thread, aac, "%s",
+ aac->name);
if (IS_ERR(aac->thread)) {
retval = PTR_ERR(aac->thread);
goto out;
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 32b7bb1..085db8b 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -601,7 +601,7 @@ static int spi_init_queue(struct spi_master *master)

init_kthread_worker(&master->kworker);
master->kworker_task = kthread_run(kthread_worker_fn,
- &master->kworker,
+ &master->kworker, "%s",
dev_name(&master->dev));
if (IS_ERR(master->kworker_task)) {
dev_err(&master->dev, "failed to create message pump task\n");
diff --git a/drivers/staging/rtl8712/os_intfs.c b/drivers/staging/rtl8712/os_intfs.c
index b65bf5e..6e81ba0 100644
--- a/drivers/staging/rtl8712/os_intfs.c
+++ b/drivers/staging/rtl8712/os_intfs.c
@@ -238,7 +238,7 @@ struct net_device *r8712_init_netdev(void)

static u32 start_drv_threads(struct _adapter *padapter)
{
- padapter->cmdThread = kthread_run(r8712_cmd_thread, padapter,
+ padapter->cmdThread = kthread_run(r8712_cmd_thread, padapter, "%s",
padapter->pnetdev->name);
if (IS_ERR(padapter->cmdThread) < 0)
return _FAIL;
diff --git a/drivers/usb/atm/usbatm.c b/drivers/usb/atm/usbatm.c
index d3527dd..5e0d33a 100644
--- a/drivers/usb/atm/usbatm.c
+++ b/drivers/usb/atm/usbatm.c
@@ -1020,7 +1020,7 @@ static int usbatm_heavy_init(struct usbatm_data *instance)
{
struct task_struct *t;

- t = kthread_create(usbatm_do_heavy_init, instance,
+ t = kthread_create(usbatm_do_heavy_init, instance, "%s",
instance->driver->driver_name);
if (IS_ERR(t)) {
usb_err(instance, "%s: failed to create kernel_thread (%ld)!\n",
@@ -1076,7 +1076,8 @@ int usbatm_usb_probe(struct usb_interface *intf, const struct usb_device_id *id,
/* public fields */

instance->driver = driver;
- snprintf(instance->driver_name, sizeof(instance->driver_name), driver->driver_name);
+ strlcpy(instance->driver_name, driver->driver_name,
+ sizeof(instance->driver_name));

instance->usb_dev = usb_dev;
instance->usb_intf = intf;
diff --git a/fs/lockd/svc.c b/fs/lockd/svc.c
index a2aa97d..10d6c41 100644
--- a/fs/lockd/svc.c
+++ b/fs/lockd/svc.c
@@ -305,7 +305,7 @@ static int lockd_start_svc(struct svc_serv *serv)
svc_sock_update_bufs(serv);
serv->sv_maxconn = nlm_max_connections;

- nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, serv->sv_name);
+ nlmsvc_task = kthread_run(lockd, nlmsvc_rqst, "%s", serv->sv_name);
if (IS_ERR(nlmsvc_task)) {
error = PTR_ERR(nlmsvc_task);
printk(KERN_WARNING
diff --git a/fs/nfs/callback.c b/fs/nfs/callback.c
index cff089a..da6a43d 100644
--- a/fs/nfs/callback.c
+++ b/fs/nfs/callback.c
@@ -211,7 +211,6 @@ static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,
struct svc_rqst *rqstp;
int (*callback_svc)(void *vrqstp);
struct nfs_callback_data *cb_info = &nfs_callback_info[minorversion];
- char svc_name[12];
int ret;

nfs_callback_bc_serv(minorversion, xprt, serv);
@@ -235,10 +234,10 @@ static int nfs_callback_start_svc(int minorversion, struct rpc_xprt *xprt,

svc_sock_update_bufs(serv);

- sprintf(svc_name, "nfsv4.%u-svc", minorversion);
cb_info->serv = serv;
cb_info->rqst = rqstp;
- cb_info->task = kthread_run(callback_svc, cb_info->rqst, svc_name);
+ cb_info->task = kthread_run(callback_svc, cb_info->rqst,
+ "nfsv4.%u-svc", minorversion);
if (IS_ERR(cb_info->task)) {
ret = PTR_ERR(cb_info->task);
svc_exit_thread(cb_info->rqst);
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 1fab140..73d0f75 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1194,7 +1194,7 @@ void nfs4_schedule_state_manager(struct nfs_client *clp)
snprintf(buf, sizeof(buf), "%s-manager",
rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR));
rcu_read_unlock();
- task = kthread_run(nfs4_run_state_manager, clp, buf);
+ task = kthread_run(nfs4_run_state_manager, clp, "%s", buf);
if (IS_ERR(task)) {
printk(KERN_ERR "%s: kthread_run: %ld\n",
__func__, PTR_ERR(task));
diff --git a/kernel/rcutree.c b/kernel/rcutree.c
index 16ea679..ea7fe31 100644
--- a/kernel/rcutree.c
+++ b/kernel/rcutree.c
@@ -3108,7 +3108,7 @@ static int __init rcu_spawn_gp_kthread(void)
struct task_struct *t;

for_each_rcu_flavor(rsp) {
- t = kthread_run(rcu_gp_kthread, rsp, rsp->name);
+ t = kthread_run(rcu_gp_kthread, rsp, "%s", rsp->name);
BUG_ON(IS_ERR(t));
rnp = rcu_get_root(rsp);
raw_spin_lock_irqsave(&rnp->lock, flags);
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 89a588b..b974571 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -740,7 +740,7 @@ svc_set_num_threads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)

__module_get(serv->sv_module);
task = kthread_create_on_node(serv->sv_function, rqstp,
- node, serv->sv_name);
+ node, "%s", serv->sv_name);
if (IS_ERR(task)) {
error = PTR_ERR(task);
module_put(serv->sv_module);
--
1.7.9.5


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