Dear developers and maintainers,
We encountered a slab-out-of-bounds bug while using our modified
syzkaller. It was tested against the latest upstream kernel (6.9). The
kernel was compiled by clang 14.0.0, and kernel config and C repro are
attached to this email. Kernel crash log is listed below.
==================================================================
BUG: KASAN: slab-out-of-bounds in asus_report_fixup+0x855/0xfe0
drivers/hid/hid-asus.c:1210
Read of size 1 at addr ffff888066e5a4cb by task kworker/1:2/783
CPU: 1 PID: 783 Comm: kworker/1:2 Not tainted 6.9.0-05151-g1b294a1f3561 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
1.13.0-1ubuntu1.1 04/01/2014
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x201/0x300 lib/dump_stack.c:114
print_address_description+0x7b/0x360 mm/kasan/report.c:377
print_report+0xfd/0x1e0 mm/kasan/report.c:488
kasan_report+0xce/0x100 mm/kasan/report.c:601
asus_report_fixup+0x855/0xfe0 drivers/hid/hid-asus.c:1210
hid_open_report+0x1ab/0x1540 drivers/hid/hid-core.c:1235
hid_parse include/linux/hid.h:1118 [inline]
asus_probe+0x844/0xcd0 drivers/hid/hid-asus.c:1065
__hid_device_probe drivers/hid/hid-core.c:2633 [inline]
hid_device_probe+0x2cd/0x4c0 drivers/hid/hid-core.c:2670
call_driver_probe+0x98/0x1c0
really_probe+0x278/0x8e0 drivers/base/dd.c:656
__driver_probe_device+0x199/0x390 drivers/base/dd.c:798
driver_probe_device+0x50/0x240 drivers/base/dd.c:828
__device_attach_driver+0x279/0x3d0 drivers/base/dd.c:956
bus_for_each_drv+0x2d9/0x330 drivers/base/bus.c:457
__device_attach+0x317/0x500 drivers/base/dd.c:1028
bus_probe_device+0x1b5/0x290 drivers/base/bus.c:532
device_add+0x8fc/0xca0 drivers/base/core.c:3720
hid_add_device+0x3a7/0x510 drivers/hid/hid-core.c:2816
usbhid_probe+0xdc7/0x1220 drivers/hid/usbhid/hid-core.c:1429
usb_probe_interface+0x6ad/0xc60 drivers/usb/core/driver.c:399
call_driver_probe+0x98/0x1c0
really_probe+0x278/0x8e0 drivers/base/dd.c:656
__driver_probe_device+0x199/0x390 drivers/base/dd.c:798
driver_probe_device+0x50/0x240 drivers/base/dd.c:828
__device_attach_driver+0x279/0x3d0 drivers/base/dd.c:956
bus_for_each_drv+0x2d9/0x330 drivers/base/bus.c:457
__device_attach+0x317/0x500 drivers/base/dd.c:1028
bus_probe_device+0x1b5/0x290 drivers/base/bus.c:532
device_add+0x8fc/0xca0 drivers/base/core.c:3720
usb_set_configuration+0x1a53/0x20b0 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x86/0x140 drivers/usb/core/generic.c:254
usb_probe_device+0x1a8/0x360 drivers/usb/core/driver.c:294
call_driver_probe+0x98/0x1c0
really_probe+0x278/0x8e0 drivers/base/dd.c:656
__driver_probe_device+0x199/0x390 drivers/base/dd.c:798
driver_probe_device+0x50/0x240 drivers/base/dd.c:828
__device_attach_driver+0x279/0x3d0 drivers/base/dd.c:956
bus_for_each_drv+0x2d9/0x330 drivers/base/bus.c:457
__device_attach+0x317/0x500 drivers/base/dd.c:1028
bus_probe_device+0x1b5/0x290 drivers/base/bus.c:532
device_add+0x8fc/0xca0 drivers/base/core.c:3720
usb_new_device+0x1015/0x1950 drivers/usb/core/hub.c:2652
hub_port_connect+0xf28/0x2090 drivers/usb/core/hub.c:5522
hub_port_connect_change+0x53f/0x8f0 drivers/usb/core/hub.c:5662
port_event+0xdcf/0x12c0 drivers/usb/core/hub.c:5822
hub_event+0x55a/0xc70 drivers/usb/core/hub.c:5904
process_one_work kernel/workqueue.c:3267 [inline]
process_scheduled_works+0x9c9/0x14a0 kernel/workqueue.c:3348
worker_thread+0x85c/0xd50 kernel/workqueue.c:3429
kthread+0x2ed/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244
</TASK>
Allocated by task 783:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x30/0x70 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:387
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slub.c:4039 [inline]
__kmalloc_node_track_caller+0x254/0x4f0 mm/slub.c:4059
kmemdup+0x2a/0x70 mm/util.c:131
_Z7kmemdupPKvU25pass_dynamic_object_size0mj
include/linux/fortify-string.h:743 [inline]
call_hid_bpf_rdesc_fixup include/linux/hid_bpf.h:157 [inline]
hid_open_report+0x140/0x1540 drivers/hid/hid-core.c:1230
hid_parse include/linux/hid.h:1118 [inline]
asus_probe+0x844/0xcd0 drivers/hid/hid-asus.c:1065
__hid_device_probe drivers/hid/hid-core.c:2633 [inline]
hid_device_probe+0x2cd/0x4c0 drivers/hid/hid-core.c:2670
call_driver_probe+0x98/0x1c0
really_probe+0x278/0x8e0 drivers/base/dd.c:656
__driver_probe_device+0x199/0x390 drivers/base/dd.c:798
driver_probe_device+0x50/0x240 drivers/base/dd.c:828
__device_attach_driver+0x279/0x3d0 drivers/base/dd.c:956
bus_for_each_drv+0x2d9/0x330 drivers/base/bus.c:457
__device_attach+0x317/0x500 drivers/base/dd.c:1028
bus_probe_device+0x1b5/0x290 drivers/base/bus.c:532
device_add+0x8fc/0xca0 drivers/base/core.c:3720
hid_add_device+0x3a7/0x510 drivers/hid/hid-core.c:2816
usbhid_probe+0xdc7/0x1220 drivers/hid/usbhid/hid-core.c:1429
usb_probe_interface+0x6ad/0xc60 drivers/usb/core/driver.c:399
call_driver_probe+0x98/0x1c0
really_probe+0x278/0x8e0 drivers/base/dd.c:656
__driver_probe_device+0x199/0x390 drivers/base/dd.c:798
driver_probe_device+0x50/0x240 drivers/base/dd.c:828
__device_attach_driver+0x279/0x3d0 drivers/base/dd.c:956
bus_for_each_drv+0x2d9/0x330 drivers/base/bus.c:457
__device_attach+0x317/0x500 drivers/base/dd.c:1028
bus_probe_device+0x1b5/0x290 drivers/base/bus.c:532
device_add+0x8fc/0xca0 drivers/base/core.c:3720
usb_set_configuration+0x1a53/0x20b0 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x86/0x140 drivers/usb/core/generic.c:254
usb_probe_device+0x1a8/0x360 drivers/usb/core/driver.c:294
call_driver_probe+0x98/0x1c0
really_probe+0x278/0x8e0 drivers/base/dd.c:656
__driver_probe_device+0x199/0x390 drivers/base/dd.c:798
driver_probe_device+0x50/0x240 drivers/base/dd.c:828
__device_attach_driver+0x279/0x3d0 drivers/base/dd.c:956
bus_for_each_drv+0x2d9/0x330 drivers/base/bus.c:457
__device_attach+0x317/0x500 drivers/base/dd.c:1028
bus_probe_device+0x1b5/0x290 drivers/base/bus.c:532
device_add+0x8fc/0xca0 drivers/base/core.c:3720
usb_new_device+0x1015/0x1950 drivers/usb/core/hub.c:2652
hub_port_connect+0xf28/0x2090 drivers/usb/core/hub.c:5522
hub_port_connect_change+0x53f/0x8f0 drivers/usb/core/hub.c:5662
port_event+0xdcf/0x12c0 drivers/usb/core/hub.c:5822
hub_event+0x55a/0xc70 drivers/usb/core/hub.c:5904
process_one_work kernel/workqueue.c:3267 [inline]
process_scheduled_works+0x9c9/0x14a0 kernel/workqueue.c:3348
worker_thread+0x85c/0xd50 kernel/workqueue.c:3429
kthread+0x2ed/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:244
The buggy address belongs to the object at ffff888066e5a480
which belongs to the cache kmalloc-96 of size 96
The buggy address is located 0 bytes to the right of
allocated 75-byte region [ffff888066e5a480, ffff888066e5a4cb)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x66e5a
flags: 0x4fff00000000800(slab|node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 04fff00000000800 ffff888013441280 ffffea0001949700 dead000000000002
raw: 0000000000000000 0000000080200020 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask
0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid
4804, tgid 4804 (systemd-udevd), ts 38895358525, free_ts 37534477740
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1e6/0x210 mm/page_alloc.c:1534
prep_new_page mm/page_alloc.c:1541 [inline]
get_page_from_freelist+0x7d2/0x850 mm/page_alloc.c:3317
__alloc_pages+0x25e/0x580 mm/page_alloc.c:4575
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page+0x6b/0x1a0 mm/slub.c:2190
allocate_slab+0x5d/0x200 mm/slub.c:2353
new_slab mm/slub.c:2406 [inline]
___slab_alloc+0xa95/0xf20 mm/slub.c:3592
__slab_alloc mm/slub.c:3682 [inline]
__slab_alloc_node mm/slub.c:3735 [inline]
slab_alloc_node mm/slub.c:3908 [inline]
__do_kmalloc_node mm/slub.c:4038 [inline]
__kmalloc_node+0x2dd/0x4f0 mm/slub.c:4046
kmalloc_array_node include/linux/slab.h:726 [inline]
kcalloc_node include/linux/slab.h:731 [inline]
memcg_alloc_slab_cgroups+0x80/0x120 mm/memcontrol.c:3015
account_slab mm/slub.c:2316 [inline]
allocate_slab+0x99/0x200 mm/slub.c:2371
new_slab mm/slub.c:2406 [inline]
___slab_alloc+0xa95/0xf20 mm/slub.c:3592
__slab_alloc mm/slub.c:3682 [inline]
__slab_alloc_node mm/slub.c:3735 [inline]
slab_alloc_node mm/slub.c:3908 [inline]
kmem_cache_alloc_lru+0x24d/0x370 mm/slub.c:3937
alloc_inode_sb include/linux/fs.h:3107 [inline]
alloc_inode fs/inode.c:263 [inline]
iget_locked+0x1f2/0x810 fs/inode.c:1280
kernfs_get_inode+0x51/0x750 fs/kernfs/inode.c:251
kernfs_iop_lookup+0x263/0x380 fs/kernfs/dir.c:1214
__lookup_slow+0x274/0x3b0 fs/namei.c:1692
lookup_slow+0x53/0x70 fs/namei.c:1709
page last free pid 4804 tgid 4804 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1141 [inline]
free_unref_page_prepare+0x72f/0x7c0 mm/page_alloc.c:2347
free_unref_page+0x37/0x3f0 mm/page_alloc.c:2487
__folio_put_small mm/swap.c:119 [inline]
__folio_put+0x20b/0x360 mm/swap.c:142
__tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline]
__tlb_remove_table_free mm/mmu_gather.c:227 [inline]
tlb_remove_table_rcu+0x75/0xf0 mm/mmu_gather.c:282
rcu_do_batch kernel/rcu/tree.c:2535 [inline]
rcu_core+0xa43/0x1740 kernel/rcu/tree.c:2809
handle_softirqs+0x274/0x730 kernel/softirq.c:554
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu+0xd7/0x1a0 kernel/softirq.c:637
irq_exit_rcu+0x9/0x20 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
Memory state around the buggy address:
ffff888066e5a380: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888066e5a400: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
>ffff888066e5a480: 00 00 00 00 00 00 00 00 00 03 fc fc fc fc fc fc
^
ffff888066e5a500: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff888066e5a580: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================
If you have any questions, please contact us.
Reported by Yue Sun <samsun1006219@xxxxxxxxx>
Reported by xingwei lee <xrivendell7@xxxxxxxxx>
Best Regards,
Yue
Attachment:
config
Description: Binary data
#define _GNU_SOURCE
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <unistd.h>
#include <linux/usb/ch9.h>
static unsigned long long procid;
static void sleep_ms(uint64_t ms)
{
usleep(ms * 1000);
}
#define MAX_FDS 30
#define USB_MAX_IFACE_NUM 4
#define USB_MAX_EP_NUM 32
#define USB_MAX_FDS 6
struct usb_endpoint_index {
struct usb_endpoint_descriptor desc;
int handle;
};
struct usb_iface_index {
struct usb_interface_descriptor* iface;
uint8_t bInterfaceNumber;
uint8_t bAlternateSetting;
uint8_t bInterfaceClass;
struct usb_endpoint_index eps[USB_MAX_EP_NUM];
int eps_num;
};
struct usb_device_index {
struct usb_device_descriptor* dev;
struct usb_config_descriptor* config;
uint8_t bDeviceClass;
uint8_t bMaxPower;
int config_length;
struct usb_iface_index ifaces[USB_MAX_IFACE_NUM];
int ifaces_num;
int iface_cur;
};
struct usb_info {
int fd;
struct usb_device_index index;
};
static struct usb_info usb_devices[USB_MAX_FDS];
static struct usb_device_index* lookup_usb_index(int fd)
{
for (int i = 0; i < USB_MAX_FDS; i++) {
if (__atomic_load_n(&usb_devices[i].fd, __ATOMIC_ACQUIRE) == fd)
return &usb_devices[i].index;
}
return NULL;
}
static int usb_devices_num;
static bool parse_usb_descriptor(const char* buffer, size_t length,
struct usb_device_index* index)
{
if (length < sizeof(*index->dev) + sizeof(*index->config))
return false;
memset(index, 0, sizeof(*index));
index->dev = (struct usb_device_descriptor*)buffer;
index->config = (struct usb_config_descriptor*)(buffer + sizeof(*index->dev));
index->bDeviceClass = index->dev->bDeviceClass;
index->bMaxPower = index->config->bMaxPower;
index->config_length = length - sizeof(*index->dev);
index->iface_cur = -1;
size_t offset = 0;
while (true) {
if (offset + 1 >= length)
break;
uint8_t desc_length = buffer[offset];
uint8_t desc_type = buffer[offset + 1];
if (desc_length <= 2)
break;
if (offset + desc_length > length)
break;
if (desc_type == USB_DT_INTERFACE &&
index->ifaces_num < USB_MAX_IFACE_NUM) {
struct usb_interface_descriptor* iface =
(struct usb_interface_descriptor*)(buffer + offset);
index->ifaces[index->ifaces_num].iface = iface;
index->ifaces[index->ifaces_num].bInterfaceNumber =
iface->bInterfaceNumber;
index->ifaces[index->ifaces_num].bAlternateSetting =
iface->bAlternateSetting;
index->ifaces[index->ifaces_num].bInterfaceClass = iface->bInterfaceClass;
index->ifaces_num++;
}
if (desc_type == USB_DT_ENDPOINT && index->ifaces_num > 0) {
struct usb_iface_index* iface = &index->ifaces[index->ifaces_num - 1];
if (iface->eps_num < USB_MAX_EP_NUM) {
memcpy(&iface->eps[iface->eps_num].desc, buffer + offset,
sizeof(iface->eps[iface->eps_num].desc));
iface->eps_num++;
}
}
offset += desc_length;
}
return true;
}
static struct usb_device_index* add_usb_index(int fd, const char* dev,
size_t dev_len)
{
int i = __atomic_fetch_add(&usb_devices_num, 1, __ATOMIC_RELAXED);
if (i >= USB_MAX_FDS)
return NULL;
if (!parse_usb_descriptor(dev, dev_len, &usb_devices[i].index))
return NULL;
__atomic_store_n(&usb_devices[i].fd, fd, __ATOMIC_RELEASE);
return &usb_devices[i].index;
}
struct vusb_connect_string_descriptor {
uint32_t len;
char* str;
} __attribute__((packed));
struct vusb_connect_descriptors {
uint32_t qual_len;
char* qual;
uint32_t bos_len;
char* bos;
uint32_t strs_len;
struct vusb_connect_string_descriptor strs[0];
} __attribute__((packed));
static const char default_string[] = {8, USB_DT_STRING, 's', 0, 'y', 0, 'z', 0};
static const char default_lang_id[] = {4, USB_DT_STRING, 0x09, 0x04};
static bool
lookup_connect_response_in(int fd, const struct vusb_connect_descriptors* descs,
const struct usb_ctrlrequest* ctrl,
struct usb_qualifier_descriptor* qual,
char** response_data, uint32_t* response_length)
{
struct usb_device_index* index = lookup_usb_index(fd);
uint8_t str_idx;
if (!index)
return false;
switch (ctrl->bRequestType & USB_TYPE_MASK) {
case USB_TYPE_STANDARD:
switch (ctrl->bRequest) {
case USB_REQ_GET_DESCRIPTOR:
switch (ctrl->wValue >> 8) {
case USB_DT_DEVICE:
*response_data = (char*)index->dev;
*response_length = sizeof(*index->dev);
return true;
case USB_DT_CONFIG:
*response_data = (char*)index->config;
*response_length = index->config_length;
return true;
case USB_DT_STRING:
str_idx = (uint8_t)ctrl->wValue;
if (descs && str_idx < descs->strs_len) {
*response_data = descs->strs[str_idx].str;
*response_length = descs->strs[str_idx].len;
return true;
}
if (str_idx == 0) {
*response_data = (char*)&default_lang_id[0];
*response_length = default_lang_id[0];
return true;
}
*response_data = (char*)&default_string[0];
*response_length = default_string[0];
return true;
case USB_DT_BOS:
*response_data = descs->bos;
*response_length = descs->bos_len;
return true;
case USB_DT_DEVICE_QUALIFIER:
if (!descs->qual) {
qual->bLength = sizeof(*qual);
qual->bDescriptorType = USB_DT_DEVICE_QUALIFIER;
qual->bcdUSB = index->dev->bcdUSB;
qual->bDeviceClass = index->dev->bDeviceClass;
qual->bDeviceSubClass = index->dev->bDeviceSubClass;
qual->bDeviceProtocol = index->dev->bDeviceProtocol;
qual->bMaxPacketSize0 = index->dev->bMaxPacketSize0;
qual->bNumConfigurations = index->dev->bNumConfigurations;
qual->bRESERVED = 0;
*response_data = (char*)qual;
*response_length = sizeof(*qual);
return true;
}
*response_data = descs->qual;
*response_length = descs->qual_len;
return true;
default:
break;
}
break;
default:
break;
}
break;
default:
break;
}
return false;
}
typedef bool (*lookup_connect_out_response_t)(
int fd, const struct vusb_connect_descriptors* descs,
const struct usb_ctrlrequest* ctrl, bool* done);
static bool lookup_connect_response_out_generic(
int fd, const struct vusb_connect_descriptors* descs,
const struct usb_ctrlrequest* ctrl, bool* done)
{
switch (ctrl->bRequestType & USB_TYPE_MASK) {
case USB_TYPE_STANDARD:
switch (ctrl->bRequest) {
case USB_REQ_SET_CONFIGURATION:
*done = true;
return true;
default:
break;
}
break;
}
return false;
}
struct vusb_descriptor {
uint8_t req_type;
uint8_t desc_type;
uint32_t len;
char data[0];
} __attribute__((packed));
struct vusb_descriptors {
uint32_t len;
struct vusb_descriptor* generic;
struct vusb_descriptor* descs[0];
} __attribute__((packed));
struct vusb_response {
uint8_t type;
uint8_t req;
uint32_t len;
char data[0];
} __attribute__((packed));
struct vusb_responses {
uint32_t len;
struct vusb_response* generic;
struct vusb_response* resps[0];
} __attribute__((packed));
static bool lookup_control_response(const struct vusb_descriptors* descs,
const struct vusb_responses* resps,
struct usb_ctrlrequest* ctrl,
char** response_data,
uint32_t* response_length)
{
int descs_num = 0;
int resps_num = 0;
if (descs)
descs_num = (descs->len - offsetof(struct vusb_descriptors, descs)) /
sizeof(descs->descs[0]);
if (resps)
resps_num = (resps->len - offsetof(struct vusb_responses, resps)) /
sizeof(resps->resps[0]);
uint8_t req = ctrl->bRequest;
uint8_t req_type = ctrl->bRequestType & USB_TYPE_MASK;
uint8_t desc_type = ctrl->wValue >> 8;
if (req == USB_REQ_GET_DESCRIPTOR) {
int i;
for (i = 0; i < descs_num; i++) {
struct vusb_descriptor* desc = descs->descs[i];
if (!desc)
continue;
if (desc->req_type == req_type && desc->desc_type == desc_type) {
*response_length = desc->len;
if (*response_length != 0)
*response_data = &desc->data[0];
else
*response_data = NULL;
return true;
}
}
if (descs && descs->generic) {
*response_data = &descs->generic->data[0];
*response_length = descs->generic->len;
return true;
}
} else {
int i;
for (i = 0; i < resps_num; i++) {
struct vusb_response* resp = resps->resps[i];
if (!resp)
continue;
if (resp->type == req_type && resp->req == req) {
*response_length = resp->len;
if (*response_length != 0)
*response_data = &resp->data[0];
else
*response_data = NULL;
return true;
}
}
if (resps && resps->generic) {
*response_data = &resps->generic->data[0];
*response_length = resps->generic->len;
return true;
}
}
return false;
}
#define UDC_NAME_LENGTH_MAX 128
struct usb_raw_init {
__u8 driver_name[UDC_NAME_LENGTH_MAX];
__u8 device_name[UDC_NAME_LENGTH_MAX];
__u8 speed;
};
enum usb_raw_event_type {
USB_RAW_EVENT_INVALID = 0,
USB_RAW_EVENT_CONNECT = 1,
USB_RAW_EVENT_CONTROL = 2,
};
struct usb_raw_event {
__u32 type;
__u32 length;
__u8 data[0];
};
struct usb_raw_ep_io {
__u16 ep;
__u16 flags;
__u32 length;
__u8 data[0];
};
#define USB_RAW_EPS_NUM_MAX 30
#define USB_RAW_EP_NAME_MAX 16
#define USB_RAW_EP_ADDR_ANY 0xff
struct usb_raw_ep_caps {
__u32 type_control : 1;
__u32 type_iso : 1;
__u32 type_bulk : 1;
__u32 type_int : 1;
__u32 dir_in : 1;
__u32 dir_out : 1;
};
struct usb_raw_ep_limits {
__u16 maxpacket_limit;
__u16 max_streams;
__u32 reserved;
};
struct usb_raw_ep_info {
__u8 name[USB_RAW_EP_NAME_MAX];
__u32 addr;
struct usb_raw_ep_caps caps;
struct usb_raw_ep_limits limits;
};
struct usb_raw_eps_info {
struct usb_raw_ep_info eps[USB_RAW_EPS_NUM_MAX];
};
#define USB_RAW_IOCTL_INIT _IOW('U', 0, struct usb_raw_init)
#define USB_RAW_IOCTL_RUN _IO('U', 1)
#define USB_RAW_IOCTL_EVENT_FETCH _IOR('U', 2, struct usb_raw_event)
#define USB_RAW_IOCTL_EP0_WRITE _IOW('U', 3, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_EP0_READ _IOWR('U', 4, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_EP_ENABLE _IOW('U', 5, struct usb_endpoint_descriptor)
#define USB_RAW_IOCTL_EP_DISABLE _IOW('U', 6, __u32)
#define USB_RAW_IOCTL_EP_WRITE _IOW('U', 7, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_EP_READ _IOWR('U', 8, struct usb_raw_ep_io)
#define USB_RAW_IOCTL_CONFIGURE _IO('U', 9)
#define USB_RAW_IOCTL_VBUS_DRAW _IOW('U', 10, __u32)
#define USB_RAW_IOCTL_EPS_INFO _IOR('U', 11, struct usb_raw_eps_info)
#define USB_RAW_IOCTL_EP0_STALL _IO('U', 12)
#define USB_RAW_IOCTL_EP_SET_HALT _IOW('U', 13, __u32)
#define USB_RAW_IOCTL_EP_CLEAR_HALT _IOW('U', 14, __u32)
#define USB_RAW_IOCTL_EP_SET_WEDGE _IOW('U', 15, __u32)
static int usb_raw_open()
{
return open("/dev/raw-gadget", O_RDWR);
}
static int usb_raw_init(int fd, uint32_t speed, const char* driver,
const char* device)
{
struct usb_raw_init arg;
strncpy((char*)&arg.driver_name[0], driver, sizeof(arg.driver_name));
strncpy((char*)&arg.device_name[0], device, sizeof(arg.device_name));
arg.speed = speed;
return ioctl(fd, USB_RAW_IOCTL_INIT, &arg);
}
static int usb_raw_run(int fd)
{
return ioctl(fd, USB_RAW_IOCTL_RUN, 0);
}
static int usb_raw_configure(int fd)
{
return ioctl(fd, USB_RAW_IOCTL_CONFIGURE, 0);
}
static int usb_raw_vbus_draw(int fd, uint32_t power)
{
return ioctl(fd, USB_RAW_IOCTL_VBUS_DRAW, power);
}
static int usb_raw_ep0_write(int fd, struct usb_raw_ep_io* io)
{
return ioctl(fd, USB_RAW_IOCTL_EP0_WRITE, io);
}
static int usb_raw_ep0_read(int fd, struct usb_raw_ep_io* io)
{
return ioctl(fd, USB_RAW_IOCTL_EP0_READ, io);
}
static int usb_raw_event_fetch(int fd, struct usb_raw_event* event)
{
return ioctl(fd, USB_RAW_IOCTL_EVENT_FETCH, event);
}
static int usb_raw_ep_enable(int fd, struct usb_endpoint_descriptor* desc)
{
return ioctl(fd, USB_RAW_IOCTL_EP_ENABLE, desc);
}
static int usb_raw_ep_disable(int fd, int ep)
{
return ioctl(fd, USB_RAW_IOCTL_EP_DISABLE, ep);
}
static int usb_raw_ep0_stall(int fd)
{
return ioctl(fd, USB_RAW_IOCTL_EP0_STALL, 0);
}
static int lookup_interface(int fd, uint8_t bInterfaceNumber,
uint8_t bAlternateSetting)
{
struct usb_device_index* index = lookup_usb_index(fd);
if (!index)
return -1;
for (int i = 0; i < index->ifaces_num; i++) {
if (index->ifaces[i].bInterfaceNumber == bInterfaceNumber &&
index->ifaces[i].bAlternateSetting == bAlternateSetting)
return i;
}
return -1;
}
#define USB_MAX_PACKET_SIZE 4096
struct usb_raw_control_event {
struct usb_raw_event inner;
struct usb_ctrlrequest ctrl;
char data[USB_MAX_PACKET_SIZE];
};
struct usb_raw_ep_io_data {
struct usb_raw_ep_io inner;
char data[USB_MAX_PACKET_SIZE];
};
static void set_interface(int fd, int n)
{
struct usb_device_index* index = lookup_usb_index(fd);
if (!index)
return;
if (index->iface_cur >= 0 && index->iface_cur < index->ifaces_num) {
for (int ep = 0; ep < index->ifaces[index->iface_cur].eps_num; ep++) {
int rv = usb_raw_ep_disable(
fd, index->ifaces[index->iface_cur].eps[ep].handle);
if (rv < 0) {
} else {
}
}
}
if (n >= 0 && n < index->ifaces_num) {
for (int ep = 0; ep < index->ifaces[n].eps_num; ep++) {
int rv = usb_raw_ep_enable(fd, &index->ifaces[n].eps[ep].desc);
if (rv < 0) {
} else {
index->ifaces[n].eps[ep].handle = rv;
}
}
index->iface_cur = n;
}
}
static int configure_device(int fd)
{
struct usb_device_index* index = lookup_usb_index(fd);
if (!index)
return -1;
int rv = usb_raw_vbus_draw(fd, index->bMaxPower);
if (rv < 0) {
return rv;
}
rv = usb_raw_configure(fd);
if (rv < 0) {
return rv;
}
set_interface(fd, 0);
return 0;
}
static volatile long
syz_usb_connect_impl(uint64_t speed, uint64_t dev_len, const char* dev,
const struct vusb_connect_descriptors* descs,
lookup_connect_out_response_t lookup_connect_response_out)
{
if (!dev) {
return -1;
}
int fd = usb_raw_open();
if (fd < 0) {
return fd;
}
if (fd >= MAX_FDS) {
close(fd);
return -1;
}
struct usb_device_index* index = add_usb_index(fd, dev, dev_len);
if (!index) {
return -1;
}
char device[32];
sprintf(&device[0], "dummy_udc.%llu", procid);
int rv = usb_raw_init(fd, speed, "dummy_udc", &device[0]);
if (rv < 0) {
return rv;
}
rv = usb_raw_run(fd);
if (rv < 0) {
return rv;
}
bool done = false;
while (!done) {
struct usb_raw_control_event event;
event.inner.type = 0;
event.inner.length = sizeof(event.ctrl);
rv = usb_raw_event_fetch(fd, (struct usb_raw_event*)&event);
if (rv < 0) {
return rv;
}
if (event.inner.type != USB_RAW_EVENT_CONTROL)
continue;
char* response_data = NULL;
uint32_t response_length = 0;
struct usb_qualifier_descriptor qual;
if (event.ctrl.bRequestType & USB_DIR_IN) {
if (!lookup_connect_response_in(fd, descs, &event.ctrl, &qual,
&response_data, &response_length)) {
usb_raw_ep0_stall(fd);
continue;
}
} else {
if (!lookup_connect_response_out(fd, descs, &event.ctrl, &done)) {
usb_raw_ep0_stall(fd);
continue;
}
response_data = NULL;
response_length = event.ctrl.wLength;
}
if ((event.ctrl.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD &&
event.ctrl.bRequest == USB_REQ_SET_CONFIGURATION) {
rv = configure_device(fd);
if (rv < 0) {
return rv;
}
}
struct usb_raw_ep_io_data response;
response.inner.ep = 0;
response.inner.flags = 0;
if (response_length > sizeof(response.data))
response_length = 0;
if (event.ctrl.wLength < response_length)
response_length = event.ctrl.wLength;
response.inner.length = response_length;
if (response_data)
memcpy(&response.data[0], response_data, response_length);
else
memset(&response.data[0], 0, response_length);
if (event.ctrl.bRequestType & USB_DIR_IN) {
rv = usb_raw_ep0_write(fd, (struct usb_raw_ep_io*)&response);
} else {
rv = usb_raw_ep0_read(fd, (struct usb_raw_ep_io*)&response);
}
if (rv < 0) {
return rv;
}
}
sleep_ms(200);
return fd;
}
static volatile long syz_usb_connect(volatile long a0, volatile long a1,
volatile long a2, volatile long a3)
{
uint64_t speed = a0;
uint64_t dev_len = a1;
const char* dev = (const char*)a2;
const struct vusb_connect_descriptors* descs =
(const struct vusb_connect_descriptors*)a3;
return syz_usb_connect_impl(speed, dev_len, dev, descs,
&lookup_connect_response_out_generic);
}
static volatile long syz_usb_control_io(volatile long a0, volatile long a1,
volatile long a2)
{
int fd = a0;
const struct vusb_descriptors* descs = (const struct vusb_descriptors*)a1;
const struct vusb_responses* resps = (const struct vusb_responses*)a2;
struct usb_raw_control_event event;
event.inner.type = 0;
event.inner.length = USB_MAX_PACKET_SIZE;
int rv = usb_raw_event_fetch(fd, (struct usb_raw_event*)&event);
if (rv < 0) {
return rv;
}
if (event.inner.type != USB_RAW_EVENT_CONTROL) {
return -1;
}
char* response_data = NULL;
uint32_t response_length = 0;
if ((event.ctrl.bRequestType & USB_DIR_IN) && event.ctrl.wLength) {
if (!lookup_control_response(descs, resps, &event.ctrl, &response_data,
&response_length)) {
usb_raw_ep0_stall(fd);
return -1;
}
} else {
if ((event.ctrl.bRequestType & USB_TYPE_MASK) == USB_TYPE_STANDARD ||
event.ctrl.bRequest == USB_REQ_SET_INTERFACE) {
int iface_num = event.ctrl.wIndex;
int alt_set = event.ctrl.wValue;
int iface_index = lookup_interface(fd, iface_num, alt_set);
if (iface_index < 0) {
} else {
set_interface(fd, iface_index);
}
}
response_length = event.ctrl.wLength;
}
struct usb_raw_ep_io_data response;
response.inner.ep = 0;
response.inner.flags = 0;
if (response_length > sizeof(response.data))
response_length = 0;
if (event.ctrl.wLength < response_length)
response_length = event.ctrl.wLength;
if ((event.ctrl.bRequestType & USB_DIR_IN) && !event.ctrl.wLength) {
response_length = USB_MAX_PACKET_SIZE;
}
response.inner.length = response_length;
if (response_data)
memcpy(&response.data[0], response_data, response_length);
else
memset(&response.data[0], 0, response_length);
if ((event.ctrl.bRequestType & USB_DIR_IN) && event.ctrl.wLength) {
rv = usb_raw_ep0_write(fd, (struct usb_raw_ep_io*)&response);
} else {
rv = usb_raw_ep0_read(fd, (struct usb_raw_ep_io*)&response);
}
if (rv < 0) {
return rv;
}
sleep_ms(200);
return 0;
}
uint64_t r[1] = {0xffffffffffffffff};
int main(void)
{
syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul,
/*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
/*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul,
/*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul,
/*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
/*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul,
/*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1,
/*offset=*/0ul);
intptr_t res = 0;
*(uint8_t*)0x200000c0 = 0x12;
*(uint8_t*)0x200000c1 = 1;
*(uint16_t*)0x200000c2 = 0;
*(uint8_t*)0x200000c4 = 0;
*(uint8_t*)0x200000c5 = 0;
*(uint8_t*)0x200000c6 = 0;
*(uint8_t*)0x200000c7 = 0x40;
*(uint16_t*)0x200000c8 = 0xb05;
*(uint16_t*)0x200000ca = 0x19b6;
*(uint16_t*)0x200000cc = 0;
*(uint8_t*)0x200000ce = 0;
*(uint8_t*)0x200000cf = 0;
*(uint8_t*)0x200000d0 = 0;
*(uint8_t*)0x200000d1 = 1;
*(uint8_t*)0x200000d2 = 9;
*(uint8_t*)0x200000d3 = 2;
*(uint16_t*)0x200000d4 = 0x24;
*(uint8_t*)0x200000d6 = 1;
*(uint8_t*)0x200000d7 = 0;
*(uint8_t*)0x200000d8 = 0;
*(uint8_t*)0x200000d9 = 0;
*(uint8_t*)0x200000da = 0;
*(uint8_t*)0x200000db = 9;
*(uint8_t*)0x200000dc = 4;
*(uint8_t*)0x200000dd = 0;
*(uint8_t*)0x200000de = 0;
*(uint8_t*)0x200000df = 2;
*(uint8_t*)0x200000e0 = 3;
*(uint8_t*)0x200000e1 = 0;
*(uint8_t*)0x200000e2 = 0;
*(uint8_t*)0x200000e3 = 0;
*(uint8_t*)0x200000e4 = 9;
*(uint8_t*)0x200000e5 = 0x21;
*(uint16_t*)0x200000e6 = 0;
*(uint8_t*)0x200000e8 = 0;
*(uint8_t*)0x200000e9 = 1;
*(uint8_t*)0x200000ea = 0x22;
*(uint16_t*)0x200000eb = 0x4b;
*(uint8_t*)0x200000ed = 9;
*(uint8_t*)0x200000ee = 5;
*(uint8_t*)0x200000ef = 0x81;
*(uint8_t*)0x200000f0 = 3;
*(uint16_t*)0x200000f1 = 0;
*(uint8_t*)0x200000f3 = 0;
*(uint8_t*)0x200000f4 = 0;
*(uint8_t*)0x200000f5 = 0;
res = -1;
res = syz_usb_connect(/*speed=*/0, /*dev_len=*/0x36, /*dev=*/0x200000c0,
/*conn_descs=*/0);
if (res != -1)
r[0] = res;
syz_usb_control_io(/*fd=*/r[0], /*descs=*/0, /*resps=*/0);
*(uint32_t*)0x20000040 = 0x24;
*(uint64_t*)0x20000044 = 0;
*(uint64_t*)0x2000004c = 0;
*(uint64_t*)0x20000054 = 0;
*(uint64_t*)0x2000005c = 0x200001c0;
*(uint8_t*)0x200001c0 = 0;
*(uint8_t*)0x200001c1 = 0x22;
*(uint32_t*)0x200001c2 = 0x371;
*(uint8_t*)0x200001c6 = 9;
*(uint8_t*)0x200001c7 = 0x21;
*(uint16_t*)0x200001c8 = 0;
*(uint8_t*)0x200001ca = 0;
*(uint8_t*)0x200001cb = 1;
*(uint8_t*)0x200001cc = 0x22;
*(uint16_t*)0x200001cd = 0;
*(uint32_t*)0x20000080 = 0xffffffeb;
*(uint64_t*)0x20000084 = 0;
*(uint64_t*)0x2000008c = 0;
*(uint64_t*)0x20000094 = 0;
*(uint64_t*)0x2000009c = 0;
*(uint64_t*)0x200000a4 = 0;
syz_usb_control_io(/*fd=*/r[0], /*descs=*/0x20000040, /*resps=*/0x20000080);
return 0;
}
