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Message-ID: <17903caa.3283.1971f2436ec.Coremail.luckd0g@163.com>
Date: Fri, 30 May 2025 11:02:36 +0800 (CST)
From: "Jianzhou Zhao" <luckd0g@....com>
To: stable@...r.kernel.org
Cc: jikos@...nel.org, bentiss@...nel.org, linux-input@...r.kernel.org,
linux-kernel@...r.kernel.org, superman.xpt@...il.com
Subject: KASAN: slab-out-of-bounds Read in steelseries_remove in
linux6.12-6.15
Hello, I found a potential bug titled " KASAN: slab-out-of-bounds Read in steelseries_remove " with modified syzkaller in the Linux6.12 - 6.15.
This bug was verified to exist in 6.12.24,6.12.28 and 6.15.
During the execution of poc, for the same hdev device, in the function steelseries_probe, the sd of hdev is first set to the steelseries_device type. If sd->quriks=0x1, Then execute steelseries_srws1_probe to reset the sd of hdev to the type steelseries_srws1_data. However, when the device is removed and the steelseries_remove command is executed, the sd obtained through hdev will first be forcibly converted to the steelseries_device type, but the value of sd->quirks may not be 0x1, but rather become some pointer. For example, sd->quirks=0xffff888022167000, then steelseries_srws1_remove (hdev) cannot be executed. This will lead to type errors in subsequent access to sd (wrongly treating sd of type steelseries_srws1_data as of type steelseries_device), and an out-of-bounds access error occurs when accessing sd->lock.
However, I still don't understand why the sd-> quirks of the same hdev in the detection phase and the deletion phase are completely inconsistent (even Pointers appear).
static int steelseries_probe(struct hid_device *hdev, const struct hid_device_id *id)
{
struct steelseries_device *sd;
int ret;
sd = devm_kzalloc(&hdev->dev, sizeof(*sd), GFP_KERNEL);
.......
hid_set_drvdata(hdev, sd); [1] Set hdev->dev->driver_data to the type of steelseries_device ( hdev->dev->driver_data = sd )
sd->hdev = hdev;
sd->quirks = id->driver_data; //Here, sd->quirks is assigned a value of 0x1
if (sd->quirks & STEELSERIES_SRWS1) { //Passed the inspection successfully
#if IS_BUILTIN(CONFIG_LEDS_CLASS) || \
(IS_MODULE(CONFIG_LEDS_CLASS) && IS_MODULE(CONFIG_HID_STEELSERIES))
return steelseries_srws1_probe(hdev, id); [2] Set hdev->dev->driver_data to the type of steelseries_srws1_data
#else
return -ENODEV;
#endif
}
......
}
static int steelseries_srws1_probe(struct hid_device *hdev,
const struct hid_device_id *id)
{
int ret, i;
struct led_classdev *led;
size_t name_sz;
char *name;
struct steelseries_srws1_data *drv_data = kzalloc(sizeof(*drv_data), GFP_KERNEL);
if (drv_data == NULL) {
hid_err(hdev, "can't alloc SRW-S1 memory\n");
return -ENOMEM;
}
hid_set_drvdata(hdev, drv_data); [3] Set hdev->dev->driver_data to the type of steelseries_srws1_data
}
static void steelseries_remove(struct hid_device *hdev)
{
struct steelseries_device *sd = hid_get_drvdata(hdev); [4] The default sd is of the steelseries_device type
unsigned long flags;
if (sd->quirks & STEELSERIES_SRWS1) { [5]sd->quriks is not 0x1 but equal to the value of a pointer, such as 0xffff888022167000. Therefore, the inspection cannot be passed and steelseries_srws1_remove cannot be executed
#if IS_BUILTIN(CONFIG_LEDS_CLASS) || \
(IS_MODULE(CONFIG_LEDS_CLASS) && IS_MODULE(CONFIG_HID_STEELSERIES))
steelseries_srws1_remove(hdev);
#endif
return;
}
spin_lock_irqsave(&sd->lock, flags); [6] The correct type of sd is steelseries_srws1_data. However, here, sd is treated as the type of steelseries_srws1_data to access sd->quirks, resulting in out-of-bounds access
......
}
The commit of the kernel is : ef4999852d307d38cfdecd91ed6892cc03beb9b8
kernel config: https://syzkaller.appspot.com/text?tag=KernelConfig&x=55f8591b98dd132
compiler: gcc version 11.4.0
If you fix this issue, please add the following tag to the commit:
Reported-by: Jianzhou Zhao <luckd0g@....com>
Reported-by: Penglei Jiang <superman.xpt@...il.com>
I put the reproduction program of this bug at the end of the email.
------------[ cut here ]-----------------------------------------
TITLE: KASAN: slab-out-of-bounds Read in steelseries_remove
------------[ cut here ]------------
==================================================================
BUG: KASAN: slab-out-of-bounds in __lock_acquire+0x31b5/0x3f40 kernel/locking/lockdep.c:5065
Read of size 8 at addr ffff8880285a64d0 by task kworker/0:11/12464
CPU: 0 UID: 0 PID: 12464 Comm: kworker/0:11 Not tainted 6.12.28 #29
Hardware name: QEMU Ubuntu 24.04 PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: usb_hub_wq hub_event
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x10e/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc6/0x620 mm/kasan/report.c:488
kasan_report+0xd8/0x110 mm/kasan/report.c:601
__lock_acquire+0x31b5/0x3f40 kernel/locking/lockdep.c:5065
lock_acquire.part.0+0x11f/0x380 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
steelseries_remove+0x8c/0x1f0 drivers/hid/hid-steelseries.c:564
hid_device_remove+0xce/0x260 drivers/hid/hid-core.c:2758
device_remove+0xc8/0x170 drivers/base/dd.c:567
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295
bus_remove_device+0x22f/0x420 drivers/base/bus.c:576
device_del+0x377/0x9c0 drivers/base/core.c:3881
hid_remove_device drivers/hid/hid-core.c:2942 [inline]
hid_destroy_device+0xe5/0x150 drivers/hid/hid-core.c:2962
usbhid_disconnect+0xa0/0xe0 drivers/hid/usbhid/hid-core.c:1459
usb_unbind_interface+0x1e8/0x960 drivers/usb/core/driver.c:461
device_remove drivers/base/dd.c:569 [inline]
device_remove+0x122/0x170 drivers/base/dd.c:561
__device_release_driver drivers/base/dd.c:1272 [inline]
device_release_driver_internal+0x44b/0x620 drivers/base/dd.c:1295
bus_remove_device+0x22f/0x420 drivers/base/bus.c:576
device_del+0x377/0x9c0 drivers/base/core.c:3881
usb_disable_device+0x35f/0x7c0 drivers/usb/core/message.c:1418
usb_disconnect+0x2e0/0x920 drivers/usb/core/hub.c:2315
hub_port_connect drivers/usb/core/hub.c:5373 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5673 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x1da4/0x4e20 drivers/usb/core/hub.c:5915
process_one_work+0x9c3/0x1b70 kernel/workqueue.c:3229
process_scheduled_works kernel/workqueue.c:3310 [inline]
worker_thread+0x61e/0xe40 kernel/workqueue.c:3391
kthread+0x2ab/0x390 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Allocated by task 2285:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:878 [inline]
kzalloc_noprof include/linux/slab.h:1014 [inline]
steelseries_srws1_probe drivers/hid/hid-steelseries.c:253 [inline]
steelseries_probe+0x69d/0xf60 drivers/hid/hid-steelseries.c:528
__hid_device_probe drivers/hid/hid-core.c:2702 [inline]
hid_device_probe+0x2f5/0x4f0 drivers/hid/hid-core.c:2739
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23a/0xa80 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459
__device_attach+0x1e5/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:534
device_add+0x1143/0x1a80 drivers/base/core.c:3692
hid_add_device+0x377/0xa60 drivers/hid/hid-core.c:2885
usbhid_probe+0xd41/0x1400 drivers/hid/usbhid/hid-core.c:1432
usb_probe_interface+0x309/0x9d0 drivers/usb/core/driver.c:399
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23a/0xa80 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459
__device_attach+0x1e5/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:534
device_add+0x1143/0x1a80 drivers/base/core.c:3692
usb_set_configuration+0x120e/0x1e10 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0xb1/0x110 drivers/usb/core/generic.c:254
usb_probe_device+0xec/0x3e0 drivers/usb/core/driver.c:294
call_driver_probe drivers/base/dd.c:579 [inline]
really_probe+0x23a/0xa80 drivers/base/dd.c:657
__driver_probe_device+0x1de/0x440 drivers/base/dd.c:799
driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829
__device_attach_driver+0x1df/0x310 drivers/base/dd.c:957
bus_for_each_drv+0x157/0x1e0 drivers/base/bus.c:459
__device_attach+0x1e5/0x4b0 drivers/base/dd.c:1029
bus_probe_device+0x17f/0x1c0 drivers/base/bus.c:534
device_add+0x1143/0x1a80 drivers/base/core.c:3692
usb_new_device+0xd04/0x19d0 drivers/usb/core/hub.c:2662
hub_port_connect drivers/usb/core/hub.c:5533 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5673 [inline]
port_event drivers/usb/core/hub.c:5833 [inline]
hub_event+0x2d92/0x4e20 drivers/usb/core/hub.c:5915
process_one_work+0x9c3/0x1b70 kernel/workqueue.c:3229
process_scheduled_works kernel/workqueue.c:3310 [inline]
worker_thread+0x61e/0xe40 kernel/workqueue.c:3391
kthread+0x2ab/0x390 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
The buggy address belongs to the object at ffff8880285a6400
which belongs to the cache kmalloc-192 of size 192
The buggy address is located 72 bytes to the right of
allocated 136-byte region [ffff8880285a6400, ffff8880285a6488)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x285a6
ksm flags: 0xfff00000000000(node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000000 ffff88801b0413c0 ffffea0000875540 dead000000000003
raw: 0000000000000000 0000000000100010 00000001f5000000 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 0x52cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 9743, tgid 9743 (syz-executor), ts 61586032132, free_ts 61073188909
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2f0/0x350 mm/page_alloc.c:1558
prep_new_page mm/page_alloc.c:1566 [inline]
get_page_from_freelist+0x7d6/0x3660 mm/page_alloc.c:3476
__alloc_pages_noprof+0x229/0x2670 mm/page_alloc.c:4754
alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269
alloc_slab_page mm/slub.c:2425 [inline]
allocate_slab mm/slub.c:2595 [inline]
new_slab+0x2df/0x410 mm/slub.c:2649
___slab_alloc+0xe2f/0x19a0 mm/slub.c:3837
__slab_alloc.isra.0+0x56/0xb0 mm/slub.c:3927
__slab_alloc_node mm/slub.c:3980 [inline]
slab_alloc_node mm/slub.c:4141 [inline]
__kmalloc_cache_noprof+0x2b4/0x300 mm/slub.c:4309
kmalloc_noprof include/linux/slab.h:878 [inline]
kzalloc_noprof include/linux/slab.h:1014 [inline]
call_usermodehelper_setup+0xaf/0x360 kernel/umh.c:363
kobject_uevent_env+0x15fe/0x1860 lib/kobject_uevent.c:628
rx_queue_add_kobject net/core/net-sysfs.c:1124 [inline]
net_rx_queue_update_kobjects+0x17c/0x5f0 net/core/net-sysfs.c:1164
register_queue_kobjects net/core/net-sysfs.c:1898 [inline]
netdev_register_kobject+0x269/0x3a0 net/core/net-sysfs.c:2143
register_netdevice+0x1312/0x1db0 net/core/dev.c:10557
veth_newlink+0x354/0x9e0 drivers/net/veth.c:1830
rtnl_newlink_create net/core/rtnetlink.c:3542 [inline]
__rtnl_newlink+0x1187/0x1910 net/core/rtnetlink.c:3762
rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3775
page last free pid 9715 tgid 9715 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0x6d7/0x1080 mm/page_alloc.c:2659
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x54/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4104 [inline]
slab_alloc_node mm/slub.c:4153 [inline]
__kmalloc_cache_noprof+0x11e/0x300 mm/slub.c:4309
kmalloc_noprof include/linux/slab.h:878 [inline]
kzalloc_noprof include/linux/slab.h:1014 [inline]
kobject_uevent_env+0x265/0x1860 lib/kobject_uevent.c:540
__kobject_del+0x168/0x1f0 lib/kobject.c:601
kobject_cleanup lib/kobject.c:680 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x327/0x5a0 lib/kobject.c:737
net_rx_queue_update_kobjects+0x476/0x5f0 net/core/net-sysfs.c:1178
netif_set_real_num_rx_queues+0x169/0x210 net/core/dev.c:3055
veth_init_queues+0x151/0x190 drivers/net/veth.c:1761
veth_newlink+0x530/0x9e0 drivers/net/veth.c:1873
rtnl_newlink_create net/core/rtnetlink.c:3542 [inline]
__rtnl_newlink+0x1187/0x1910 net/core/rtnetlink.c:3762
rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3775
rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6678
netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2537
Memory state around the buggy address:
ffff8880285a6380: 00 00 00 00 00 fc fc fc fc fc fc fc fc fc fc fc
ffff8880285a6400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8880285a6480: 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
^
ffff8880285a6500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffff8880285a6580: 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc fc
==================================================================
// autogenerated by syzkaller (https://github.com/google/syzkaller)
#define _GNU_SOURCE
#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.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/prctl.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <time.h>
#include <unistd.h>
#include <linux/usb/ch9.h>
static unsigned long long procid;
static void sleep_ms(uint64_t ms)
{
usleep(ms * 1000);
}
static uint64_t current_time_ms(void)
{
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
exit(1);
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}
static bool write_file(const char* file, const char* what, ...)
{
char buf[1024];
va_list args;
va_start(args, what);
vsnprintf(buf, sizeof(buf), what, args);
va_end(args);
buf[sizeof(buf) - 1] = 0;
int len = strlen(buf);
int fd = open(file, O_WRONLY | O_CLOEXEC);
if (fd == -1)
return false;
if (write(fd, buf, len) != len) {
int err = errno;
close(fd);
errno = err;
return false;
}
close(fd);
return true;
}
#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;
}
static void kill_and_wait(int pid, int* status)
{
kill(-pid, SIGKILL);
kill(pid, SIGKILL);
for (int i = 0; i < 100; i++) {
if (waitpid(-1, status, WNOHANG | __WALL) == pid)
return;
usleep(1000);
}
DIR* dir = opendir("/sys/fs/fuse/connections");
if (dir) {
for (;;) {
struct dirent* ent = readdir(dir);
if (!ent)
break;
if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0)
continue;
char abort[300];
snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name);
int fd = open(abort, O_WRONLY);
if (fd == -1) {
continue;
}
if (write(fd, abort, 1) < 0) {
}
close(fd);
}
closedir(dir);
} else {
}
while (waitpid(-1, status, __WALL) != pid) {
}
}
static void setup_test()
{
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
write_file("/proc/self/oom_score_adj", "1000");
}
static void execute_one(void);
#define WAIT_FLAGS __WALL
static void loop(void)
{
int iter = 0;
for (;; iter++) {
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
setup_test();
execute_one();
exit(0);
}
int status = 0;
uint64_t start = current_time_ms();
for (;;) {
sleep_ms(10);
if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
break;
if (current_time_ms() - start < 5000)
continue;
kill_and_wait(pid, &status);
break;
}
}
}
uint64_t r[1] = {0xffffffffffffffff};
void execute_one(void)
{
intptr_t res = 0;
if (write(1, "executing program\n", sizeof("executing program\n") - 1)) {}
*(uint8_t*)0x200000000040 = 0x12;
*(uint8_t*)0x200000000041 = 1;
*(uint16_t*)0x200000000042 = 0x200;
*(uint8_t*)0x200000000044 = 0;
*(uint8_t*)0x200000000045 = 0;
*(uint8_t*)0x200000000046 = 0;
*(uint8_t*)0x200000000047 = 8;
*(uint16_t*)0x200000000048 = 0x1038;
*(uint16_t*)0x20000000004a = 0x1410;
*(uint16_t*)0x20000000004c = 0;
*(uint8_t*)0x20000000004e = 0;
*(uint8_t*)0x20000000004f = 0;
*(uint8_t*)0x200000000050 = 0;
*(uint8_t*)0x200000000051 = 1;
*(uint8_t*)0x200000000052 = 9;
*(uint8_t*)0x200000000053 = 2;
*(uint16_t*)0x200000000054 = 0x24;
*(uint8_t*)0x200000000056 = 1;
*(uint8_t*)0x200000000057 = 0;
*(uint8_t*)0x200000000058 = 0;
*(uint8_t*)0x200000000059 = 0;
*(uint8_t*)0x20000000005a = 2;
*(uint8_t*)0x20000000005b = 9;
*(uint8_t*)0x20000000005c = 4;
*(uint8_t*)0x20000000005d = 0;
*(uint8_t*)0x20000000005e = 0;
*(uint8_t*)0x20000000005f = 1;
*(uint8_t*)0x200000000060 = 3;
*(uint8_t*)0x200000000061 = 0;
*(uint8_t*)0x200000000062 = 1;
*(uint8_t*)0x200000000063 = 0;
*(uint8_t*)0x200000000064 = 9;
*(uint8_t*)0x200000000065 = 0x21;
*(uint16_t*)0x200000000066 = 8;
*(uint8_t*)0x200000000068 = 0xfd;
*(uint8_t*)0x200000000069 = 1;
*(uint8_t*)0x20000000006a = 0x22;
*(uint16_t*)0x20000000006b = 0x29;
*(uint8_t*)0x20000000006d = 9;
*(uint8_t*)0x20000000006e = 5;
*(uint8_t*)0x20000000006f = 0x81;
*(uint8_t*)0x200000000070 = 3;
*(uint16_t*)0x200000000071 = 0;
*(uint8_t*)0x200000000073 = 0;
*(uint8_t*)0x200000000074 = 0;
*(uint8_t*)0x200000000075 = 0;
res = -1;
res = syz_usb_connect(/*speed=*/0, /*dev_len=*/0x36, /*dev=*/0x200000000040, /*conn_descs=*/0);
if (res != -1)
r[0] = res;
syz_usb_control_io(/*fd=*/r[0], /*descs=*/0, /*resps=*/0);
syscall(__NR_prctl, /*option=*/0x26ul, /*arg=*/1ul, 0, 0, 0);
*(uint32_t*)0x200000000000 = 0x2c;
*(uint64_t*)0x200000000004 = 0x2000000000c0;
memcpy((void*)0x2000000000c0, "\x40\x0c\x2a\x00\x00\x00\x2a\x22\x5f\xab\xe9\x36\x24\xdb\xb2\x2d\x8b\x5a\xc8\x50\x1c\x70\x40\xb2\xad\xcf\x1f\xb3\xab\x7e\xd1\x6b\xbb\xbf\xa2\xa0\x80\x2a\x9e\x3f\x78\x95\xe5\x90\x2e\xdd\xcb\x54", 48);
*(uint64_t*)0x20000000000c = 0;
*(uint64_t*)0x200000000014 = 0;
*(uint64_t*)0x20000000001c = 0;
*(uint64_t*)0x200000000024 = 0;
syz_usb_control_io(/*fd=*/r[0], /*descs=*/0x200000000000, /*resps=*/0);
}
int main(void)
{
syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul);
syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul);
const char* reason;
(void)reason;
loop();
return 0;
}
I hope it helps.
Best regards
Jianzhou Zhao
Penglei Jiang
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