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Date: Wed, 31 Jul 2019 10:54:47 -0400
From: Tomas Bortoli <tomasbortoli@...il.com>
To: wg@...ndegger.com, mkl@...gutronix.de, linux-can@...r.kernel.org
Cc: davem@...emloft.net, gregkh@...uxfoundation.org,
alexios.zavras@...el.com, tglx@...utronix.de, allison@...utok.net,
netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
syzkaller@...glegroups.com, Tomas Bortoli <tomasbortoli@...il.com>
Subject: [PATCH] peak_usb: Fix info-leaks to USB devices
Uninitialized Kernel memory can leak to USB devices.
Fix by using kzalloc() instead of kmalloc() on the affected buffers.
Signed-off-by: Tomas Bortoli <tomasbortoli@...il.com>
Reported-by: syzbot+d6a5a1a3657b596ef132@...kaller.appspotmail.com
Reported-by: syzbot+513e4d0985298538bf9b@...kaller.appspotmail.com
---
Crash logs:
1.
BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x7ef/0x1f50 drivers/usb/core/urb.c:405
CPU: 0 PID: 3359 Comm: kworker/0:2 Not tainted 5.2.0-rc4+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x191/0x1f0 lib/dump_stack.c:113
kmsan_report+0x162/0x2d0 mm/kmsan/kmsan.c:611
kmsan_internal_check_memory+0x974/0xa80 mm/kmsan/kmsan.c:705
kmsan_handle_urb+0x28/0x40 mm/kmsan/kmsan_hooks.c:617
usb_submit_urb+0x7ef/0x1f50 drivers/usb/core/urb.c:405
usb_start_wait_urb+0x143/0x410 drivers/usb/core/message.c:58
usb_internal_control_msg drivers/usb/core/message.c:102 [inline]
usb_control_msg+0x49f/0x7f0 drivers/usb/core/message.c:156
pcan_usb_pro_send_req+0x26b/0x3e0 drivers/net/can/usb/peak_usb/pcan_usb_pro.c:336
pcan_usb_fd_drv_loaded drivers/net/can/usb/peak_usb/pcan_usb_fd.c:460 [inline]
pcan_usb_fd_init+0x16ee/0x1900 drivers/net/can/usb/peak_usb/pcan_usb_fd.c:885
peak_usb_create_dev drivers/net/can/usb/peak_usb/pcan_usb_core.c:809 [inline]
peak_usb_probe+0x1416/0x1b20 drivers/net/can/usb/peak_usb/pcan_usb_core.c:907
usb_probe_interface+0xd19/0x1310 drivers/usb/core/driver.c:361
really_probe+0x1344/0x1d90 drivers/base/dd.c:513
driver_probe_device+0x1ba/0x510 drivers/base/dd.c:670
__device_attach_driver+0x5b8/0x790 drivers/base/dd.c:777
bus_for_each_drv+0x28e/0x3b0 drivers/base/bus.c:454
__device_attach+0x489/0x750 drivers/base/dd.c:843
device_initial_probe+0x4a/0x60 drivers/base/dd.c:890
2.
BUG: KMSAN: kernel-usb-infoleak in usb_submit_urb+0x7ef/0x1f50 /drivers/usb/core/urb.c:405
CPU: 1 PID: 3814 Comm: kworker/1:2 Not tainted 5.2.0+ #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack /lib/dump_stack.c:77 [inline]
dump_stack+0x191/0x1f0 /lib/dump_stack.c:113
kmsan_report+0x162/0x2d0 /mm/kmsan/kmsan_report.c:109
kmsan_internal_check_memory+0x974/0xa80 /mm/kmsan/kmsan.c:551
kmsan_handle_urb+0x28/0x40 /mm/kmsan/kmsan_hooks.c:621
usb_submit_urb+0x7ef/0x1f50 /drivers/usb/core/urb.c:405
usb_start_wait_urb+0x143/0x410 /drivers/usb/core/message.c:58
usb_internal_control_msg /drivers/usb/core/message.c:102 [inline]
usb_control_msg+0x49f/0x7f0 /drivers/usb/core/message.c:156
pcan_usb_pro_send_req /drivers/net/can/usb/peak_usb/pcan_usb_pro.c:336 [inline]
pcan_usb_pro_drv_loaded /drivers/net/can/usb/peak_usb/pcan_usb_pro.c:504 [inline]
pcan_usb_pro_init+0x1319/0x1720 /drivers/net/can/usb/peak_usb/pcan_usb_pro.c:894
peak_usb_create_dev /drivers/net/can/usb/peak_usb/pcan_usb_core.c:809 [inline]
peak_usb_probe+0x1416/0x1b20 /drivers/net/can/usb/peak_usb/pcan_usb_core.c:907
usb_probe_interface+0xd19/0x1310 /drivers/usb/core/driver.c:361
really_probe+0x1344/0x1d90 /drivers/base/dd.c:513
driver_probe_device+0x1ba/0x510 /drivers/base/dd.c:670
__device_attach_driver+0x5b8/0x790 /drivers/base/dd.c:777
bus_for_each_drv+0x28e/0x3b0 /drivers/base/bus.c:454
__device_attach+0x489/0x750 /drivers/base/dd.c:843
device_initial_probe+0x4a/0x60 /drivers/base/dd.c:890
bus_probe_device+0x131/0x390 /drivers/base/bus.c:514
device_add+0x25b5/0x2df0 /drivers/base/core.c:2111
usb_set_configuration+0x309f/0x3710 /drivers/usb/core/message.c:2027
generic_probe+0xe7/0x280 /drivers/usb/core/generic.c:210
usb_probe_device+0x146/0x200 /drivers/usb/core/driver.c:266
really_probe+0x1344/0x1d90 /drivers/base/dd.c:513
driver_probe_device+0x1ba/0x510 /drivers/base/dd.c:670
__device_attach_driver+0x5b8/0x790 /drivers/base/dd.c:777
bus_for_each_drv+0x28e/0x3b0 /drivers/base/bus.c:454
__device_attach+0x489/0x750 /drivers/base/dd.c:843
device_initial_probe+0x4a/0x60 /drivers/base/dd.c:890
bus_probe_device+0x131/0x390 /drivers/base/bus.c:514
device_add+0x25b5/0x2df0 /drivers/base/core.c:2111
usb_new_device+0x23e5/0x2fb0 /drivers/usb/core/hub.c:2534
hub_port_connect /drivers/usb/core/hub.c:5089 [inline]
hub_port_connect_change /drivers/usb/core/hub.c:5204 [inline]
port_event /drivers/usb/core/hub.c:5350 [inline]
hub_event+0x5853/0x7320 /drivers/usb/core/hub.c:5432
process_one_work+0x1572/0x1f00 /kernel/workqueue.c:2269
worker_thread+0x111b/0x2460 /kernel/workqueue.c:2415
kthread+0x4b5/0x4f0 /kernel/kthread.c:256
ret_from_fork+0x35/0x40 /arch/x86/entry/entry_64.S:355
Uninit was created at:
kmsan_save_stack_with_flags /mm/kmsan/kmsan.c:187 [inline]
kmsan_internal_poison_shadow+0x53/0xa0 /mm/kmsan/kmsan.c:146
kmsan_slab_alloc+0xaa/0x120 /mm/kmsan/kmsan_hooks.c:175
slab_alloc_node /mm/slub.c:2771 [inline]
slab_alloc /mm/slub.c:2780 [inline]
kmem_cache_alloc_trace+0x873/0xa50 /mm/slub.c:2797
kmalloc /./include/linux/slab.h:547 [inline]
pcan_usb_pro_drv_loaded /drivers/net/can/usb/peak_usb/pcan_usb_pro.c:497 [inline]
pcan_usb_pro_init+0xe96/0x1720 /drivers/net/can/usb/peak_usb/pcan_usb_pro.c:894
peak_usb_create_dev /drivers/net/can/usb/peak_usb/pcan_usb_core.c:809 [inline]
peak_usb_probe+0x1416/0x1b20 /drivers/net/can/usb/peak_usb/pcan_usb_core.c:907
usb_probe_interface+0xd19/0x1310 /drivers/usb/core/driver.c:361
really_probe+0x1344/0x1d90 /drivers/base/dd.c:513
driver_probe_device+0x1ba/0x510 /drivers/base/dd.c:670
__device_attach_driver+0x5b8/0x790 /drivers/base/dd.c:777
bus_for_each_drv+0x28e/0x3b0 /drivers/base/bus.c:454
__device_attach+0x489/0x750 /drivers/base/dd.c:843
device_initial_probe+0x4a/0x60 /drivers/base/dd.c:890
bus_probe_device+0x131/0x390 /drivers/base/bus.c:514
device_add+0x25b5/0x2df0 /drivers/base/core.c:2111
usb_set_configuration+0x309f/0x3710 /drivers/usb/core/message.c:2027
generic_probe+0xe7/0x280 /drivers/usb/core/generic.c:210
usb_probe_device+0x146/0x200 /drivers/usb/core/driver.c:266
really_probe+0x1344/0x1d90 /drivers/base/dd.c:513
driver_probe_device+0x1ba/0x510 /drivers/base/dd.c:670
__device_attach_driver+0x5b8/0x790 /drivers/base/dd.c:777
bus_for_each_drv+0x28e/0x3b0 /drivers/base/bus.c:454
__device_attach+0x489/0x750 /drivers/base/dd.c:843
device_initial_probe+0x4a/0x60 /drivers/base/dd.c:890
bus_probe_device+0x131/0x390 /drivers/base/bus.c:514
device_add+0x25b5/0x2df0 /drivers/base/core.c:2111
usb_new_device+0x23e5/0x2fb0 /drivers/usb/core/hub.c:2534
hub_port_connect /drivers/usb/core/hub.c:5089 [inline]
hub_port_connect_change /drivers/usb/core/hub.c:5204 [inline]
port_event /drivers/usb/core/hub.c:5350 [inline]
hub_event+0x5853/0x7320 /drivers/usb/core/hub.c:5432
process_one_work+0x1572/0x1f00 /kernel/workqueue.c:2269
worker_thread+0x111b/0x2460 /kernel/workqueue.c:2415
kthread+0x4b5/0x4f0 /kernel/kthread.c:256
ret_from_fork+0x35/0x40 /arch/x86/entry/entry_64.S:355
Bytes 2-15 of 16 are uninitialized
Memory access of size 16 starts at ffff8881030286e0
==================================================================
drivers/net/can/usb/peak_usb/pcan_usb_fd.c | 2 +-
drivers/net/can/usb/peak_usb/pcan_usb_pro.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
index 34761c3a6286..47cc1ff5b88e 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_fd.c
@@ -841,7 +841,7 @@ static int pcan_usb_fd_init(struct peak_usb_device *dev)
goto err_out;
/* allocate command buffer once for all for the interface */
- pdev->cmd_buffer_addr = kmalloc(PCAN_UFD_CMD_BUFFER_SIZE,
+ pdev->cmd_buffer_addr = kzalloc(PCAN_UFD_CMD_BUFFER_SIZE,
GFP_KERNEL);
if (!pdev->cmd_buffer_addr)
goto err_out_1;
diff --git a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
index 178bb7cff0c1..53cb2f72bdd0 100644
--- a/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
+++ b/drivers/net/can/usb/peak_usb/pcan_usb_pro.c
@@ -494,7 +494,7 @@ static int pcan_usb_pro_drv_loaded(struct peak_usb_device *dev, int loaded)
u8 *buffer;
int err;
- buffer = kmalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL);
+ buffer = kzalloc(PCAN_USBPRO_FCT_DRVLD_REQ_LEN, GFP_KERNEL);
if (!buffer)
return -ENOMEM;
--
2.11.0
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