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TITLE: KMSAN: uninit-value in nci_rx_work | |
CORRUPTED: false () | |
===================================================== | |
BUG: KMSAN: uninit-value in nci_rx_work+0x31b/0x540 net/nfc/nci/core.c:1516 | |
nci_rx_work+0x31b/0x540 net/nfc/nci/core.c:1516 | |
process_one_work kernel/workqueue.c:2627 [inline] | |
process_scheduled_works+0xff6/0x1e60 kernel/workqueue.c:2700 | |
worker_thread+0xeca/0x14d0 kernel/workqueue.c:2781 | |
kthread+0x3d1/0x530 kernel/kthread.c:388 | |
ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 | |
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 | |
Uninit was stored to memory at: | |
nci_rx_work+0x314/0x540 net/nfc/nci/core.c:1516 | |
process_one_work kernel/workqueue.c:2627 [inline] | |
process_scheduled_works+0xff6/0x1e60 kernel/workqueue.c:2700 | |
worker_thread+0xeca/0x14d0 kernel/workqueue.c:2781 | |
kthread+0x3d1/0x530 kernel/kthread.c:388 | |
ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 | |
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 | |
Uninit was created at: | |
slab_post_alloc_hook+0x103/0x9e0 mm/slab.h:768 | |
slab_alloc_node mm/slub.c:3478 [inline] | |
kmem_cache_alloc_node+0x5f7/0xb50 mm/slub.c:3523 | |
kmalloc_reserve+0x13c/0x4a0 net/core/skbuff.c:560 | |
__alloc_skb+0x2fd/0x770 net/core/skbuff.c:651 | |
alloc_skb include/linux/skbuff.h:1286 [inline] | |
virtual_ncidev_write+0x6d/0x280 drivers/nfc/virtual_ncidev.c:120 | |
vfs_write+0x546/0x13f0 fs/read_write.c:582 | |
ksys_write+0x1f3/0x4a0 fs/read_write.c:637 | |
__do_sys_write fs/read_write.c:649 [inline] | |
__se_sys_write fs/read_write.c:646 [inline] | |
__x64_sys_write+0x97/0xf0 fs/read_write.c:646 | |
do_syscall_x64 arch/x86/entry/common.c:52 [inline] | |
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 | |
entry_SYSCALL_64_after_hwframe+0x63/0x6b | |
CPU: 1 PID: 68 Comm: kworker/u8:4 Not tainted 6.7.0-rc6-00157-g7c5e046bdcb2 #9 | |
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014 | |
Workqueue: nfc2_nci_rx_wq nci_rx_work | |
===================================================== | |
nci_rx_work+0x31b/0x540 net/nfc/nci/core.c:1516 | |
process_one_work kernel/workqueue.c:2627 [inline] | |
process_scheduled_works+0xff6/0x1e60 kernel/workqueue.c:2700 | |
worker_thread+0xeca/0x14d0 kernel/workqueue.c:2781 | |
kthread+0x3d1/0x530 kernel/kthread.c:388 | |
ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 | |
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 | |
Uninit was stored to memory at: | |
nci_rx_work+0x314/0x540 net/nfc/nci/core.c:1516 | |
process_one_work kernel/workqueue.c:2627 [inline] | |
process_scheduled_works+0xff6/0x1e60 kernel/workqueue.c:2700 | |
worker_thread+0xeca/0x14d0 kernel/workqueue.c:2781 | |
kthread+0x3d1/0x530 kernel/kthread.c:388 | |
ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 | |
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 | |
Uninit was created at: | |
slab_post_alloc_hook+0x103/0x9e0 mm/slab.h:768 | |
slab_alloc_node mm/slub.c:3478 [inline] | |
kmem_cache_alloc_node+0x5f7/0xb50 mm/slub.c:3523 | |
kmalloc_reserve+0x13c/0x4a0 net/core/skbuff.c:560 | |
__alloc_skb+0x2fd/0x770 net/core/skbuff.c:651 | |
alloc_skb include/linux/skbuff.h:1286 [inline] | |
virtual_ncidev_write+0x6d/0x280 drivers/nfc/virtual_ncidev.c:120 | |
vfs_write+0x546/0x13f0 fs/read_write.c:582 | |
ksys_write+0x1f3/0x4a0 fs/read_write.c:637 | |
__do_sys_write fs/read_write.c:649 [inline] | |
__se_sys_write fs/read_write.c:646 [inline] | |
__x64_sys_write+0x97/0xf0 fs/read_write.c:646 | |
do_syscall_x64 arch/x86/entry/common.c:52 [inline] | |
do_syscall_64+0x44/0x110 arch/x86/entry/common.c:83 | |
entry_SYSCALL_64_after_hwframe+0x63/0x6b | |
CPU: 1 PID: 68 Comm: kworker/u8:4 Not tainted 6.7.0-rc6-00157-g7c5e046bdcb2 #9 | |
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014 | |
Workqueue: nfc2_nci_rx_wq nci_rx_work | |
===================================================== | |
Disabling lock debugging due to kernel taint | |
Kernel panic - not syncing: kmsan.panic set ... | |
CPU: 1 PID: 68 Comm: kworker/u8:4 Tainted: G B 6.7.0-rc6-00157-g7c5e046bdcb2 #9 | |
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-1.fc38 04/01/2014 | |
Workqueue: nfc2_nci_rx_wq nci_rx_work | |
Call Trace: | |
<TASK> | |
__dump_stack lib/dump_stack.c:88 [inline] | |
dump_stack_lvl+0x1af/0x230 lib/dump_stack.c:106 | |
dump_stack+0x1e/0x20 lib/dump_stack.c:113 | |
panic+0x4d6/0xc60 kernel/panic.c:344 | |
kmsan_report+0x2d7/0x2e0 mm/kmsan/report.c:216 | |
__msan_warning+0x96/0x110 mm/kmsan/instrumentation.c:317 | |
nci_rx_work+0x31b/0x540 net/nfc/nci/core.c:1516 | |
process_one_work kernel/workqueue.c:2627 [inline] | |
process_scheduled_works+0xff6/0x1e60 kernel/workqueue.c:2700 | |
worker_thread+0xeca/0x14d0 kernel/workqueue.c:2781 | |
kthread+0x3d1/0x530 kernel/kthread.c:388 | |
ret_from_fork+0x66/0x80 arch/x86/kernel/process.c:147 | |
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 | |
</TASK> | |
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// autogenerated by syzkaller (https://github.com/google/syzkaller) | |
#define _GNU_SOURCE | |
#include <arpa/inet.h> | |
#include <dirent.h> | |
#include <endian.h> | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <linux/futex.h> | |
#include <linux/genetlink.h> | |
#include <linux/if_addr.h> | |
#include <linux/if_link.h> | |
#include <linux/in6.h> | |
#include <linux/neighbour.h> | |
#include <linux/net.h> | |
#include <linux/netlink.h> | |
#include <linux/rtnetlink.h> | |
#include <linux/veth.h> | |
#include <net/if.h> | |
#include <netinet/in.h> | |
#include <pthread.h> | |
#include <signal.h> | |
#include <stdarg.h> | |
#include <stdbool.h> | |
#include <stdint.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <sys/prctl.h> | |
#include <sys/socket.h> | |
#include <sys/stat.h> | |
#include <sys/syscall.h> | |
#include <sys/types.h> | |
#include <sys/wait.h> | |
#include <time.h> | |
#include <unistd.h> | |
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 void thread_start(void* (*fn)(void*), void* arg) { | |
pthread_t th; | |
pthread_attr_t attr; | |
pthread_attr_init(&attr); | |
pthread_attr_setstacksize(&attr, 128 << 10); | |
int i = 0; | |
for (; i < 100; i++) { | |
if (pthread_create(&th, &attr, fn, arg) == 0) { | |
pthread_attr_destroy(&attr); | |
return; | |
} | |
if (errno == EAGAIN) { | |
usleep(50); | |
continue; | |
} | |
break; | |
} | |
exit(1); | |
} | |
typedef struct { | |
int state; | |
} event_t; | |
static void event_init(event_t* ev) { ev->state = 0; } | |
static void event_reset(event_t* ev) { ev->state = 0; } | |
static void event_set(event_t* ev) { | |
if (ev->state) exit(1); | |
__atomic_store_n(&ev->state, 1, __ATOMIC_RELEASE); | |
syscall(SYS_futex, &ev->state, FUTEX_WAKE | FUTEX_PRIVATE_FLAG, 1000000); | |
} | |
static void event_wait(event_t* ev) { | |
while (!__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) | |
syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, 0); | |
} | |
static int event_isset(event_t* ev) { | |
return __atomic_load_n(&ev->state, __ATOMIC_ACQUIRE); | |
} | |
static int event_timedwait(event_t* ev, uint64_t timeout) { | |
uint64_t start = current_time_ms(); | |
uint64_t now = start; | |
for (;;) { | |
uint64_t remain = timeout - (now - start); | |
struct timespec ts; | |
ts.tv_sec = remain / 1000; | |
ts.tv_nsec = (remain % 1000) * 1000 * 1000; | |
syscall(SYS_futex, &ev->state, FUTEX_WAIT | FUTEX_PRIVATE_FLAG, 0, &ts); | |
if (__atomic_load_n(&ev->state, __ATOMIC_ACQUIRE)) return 1; | |
now = current_time_ms(); | |
if (now - start > timeout) return 0; | |
} | |
} | |
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; | |
} | |
struct nlmsg { | |
char* pos; | |
int nesting; | |
struct nlattr* nested[8]; | |
char buf[4096]; | |
}; | |
static void netlink_init(struct nlmsg* nlmsg, int typ, int flags, | |
const void* data, int size) { | |
memset(nlmsg, 0, sizeof(*nlmsg)); | |
struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; | |
hdr->nlmsg_type = typ; | |
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK | flags; | |
memcpy(hdr + 1, data, size); | |
nlmsg->pos = (char*)(hdr + 1) + NLMSG_ALIGN(size); | |
} | |
static void netlink_attr(struct nlmsg* nlmsg, int typ, const void* data, | |
int size) { | |
struct nlattr* attr = (struct nlattr*)nlmsg->pos; | |
attr->nla_len = sizeof(*attr) + size; | |
attr->nla_type = typ; | |
if (size > 0) memcpy(attr + 1, data, size); | |
nlmsg->pos += NLMSG_ALIGN(attr->nla_len); | |
} | |
static int netlink_send_ext(struct nlmsg* nlmsg, int sock, uint16_t reply_type, | |
int* reply_len, bool dofail) { | |
if (nlmsg->pos > nlmsg->buf + sizeof(nlmsg->buf) || nlmsg->nesting) exit(1); | |
struct nlmsghdr* hdr = (struct nlmsghdr*)nlmsg->buf; | |
hdr->nlmsg_len = nlmsg->pos - nlmsg->buf; | |
struct sockaddr_nl addr; | |
memset(&addr, 0, sizeof(addr)); | |
addr.nl_family = AF_NETLINK; | |
ssize_t n = sendto(sock, nlmsg->buf, hdr->nlmsg_len, 0, | |
(struct sockaddr*)&addr, sizeof(addr)); | |
if (n != (ssize_t)hdr->nlmsg_len) { | |
if (dofail) exit(1); | |
return -1; | |
} | |
n = recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); | |
if (reply_len) *reply_len = 0; | |
if (n < 0) { | |
if (dofail) exit(1); | |
return -1; | |
} | |
if (n < (ssize_t)sizeof(struct nlmsghdr)) { | |
errno = EINVAL; | |
if (dofail) exit(1); | |
return -1; | |
} | |
if (hdr->nlmsg_type == NLMSG_DONE) return 0; | |
if (reply_len && hdr->nlmsg_type == reply_type) { | |
*reply_len = n; | |
return 0; | |
} | |
if (n < (ssize_t)(sizeof(struct nlmsghdr) + sizeof(struct nlmsgerr))) { | |
errno = EINVAL; | |
if (dofail) exit(1); | |
return -1; | |
} | |
if (hdr->nlmsg_type != NLMSG_ERROR) { | |
errno = EINVAL; | |
if (dofail) exit(1); | |
return -1; | |
} | |
errno = -((struct nlmsgerr*)(hdr + 1))->error; | |
return -errno; | |
} | |
static int netlink_query_family_id(struct nlmsg* nlmsg, int sock, | |
const char* family_name, bool dofail) { | |
struct genlmsghdr genlhdr; | |
memset(&genlhdr, 0, sizeof(genlhdr)); | |
genlhdr.cmd = CTRL_CMD_GETFAMILY; | |
netlink_init(nlmsg, GENL_ID_CTRL, 0, &genlhdr, sizeof(genlhdr)); | |
netlink_attr(nlmsg, CTRL_ATTR_FAMILY_NAME, family_name, | |
strnlen(family_name, GENL_NAMSIZ - 1) + 1); | |
int n = 0; | |
int err = netlink_send_ext(nlmsg, sock, GENL_ID_CTRL, &n, dofail); | |
if (err < 0) { | |
return -1; | |
} | |
uint16_t id = 0; | |
struct nlattr* attr = (struct nlattr*)(nlmsg->buf + NLMSG_HDRLEN + | |
NLMSG_ALIGN(sizeof(genlhdr))); | |
for (; (char*)attr < nlmsg->buf + n; | |
attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) { | |
if (attr->nla_type == CTRL_ATTR_FAMILY_ID) { | |
id = *(uint16_t*)(attr + 1); | |
break; | |
} | |
} | |
if (!id) { | |
errno = EINVAL; | |
return -1; | |
} | |
recv(sock, nlmsg->buf, sizeof(nlmsg->buf), 0); | |
return id; | |
} | |
const int kInitNetNsFd = 201; | |
static long syz_init_net_socket(volatile long domain, volatile long type, | |
volatile long proto) { | |
return syscall(__NR_socket, domain, type, proto); | |
} | |
static long syz_genetlink_get_family_id(volatile long name, | |
volatile long sock_arg) { | |
int fd = sock_arg; | |
if (fd < 0) { | |
fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC); | |
if (fd == -1) { | |
return -1; | |
} | |
} | |
struct nlmsg nlmsg_tmp; | |
int ret = netlink_query_family_id(&nlmsg_tmp, fd, (char*)name, false); | |
if ((int)sock_arg < 0) close(fd); | |
if (ret < 0) { | |
return -1; | |
} | |
return ret; | |
} | |
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"); | |
} | |
struct thread_t { | |
int created, call; | |
event_t ready, done; | |
}; | |
static struct thread_t threads[16]; | |
static void execute_call(int call); | |
static int running; | |
static void* thr(void* arg) { | |
struct thread_t* th = (struct thread_t*)arg; | |
for (;;) { | |
event_wait(&th->ready); | |
event_reset(&th->ready); | |
execute_call(th->call); | |
__atomic_fetch_sub(&running, 1, __ATOMIC_RELAXED); | |
event_set(&th->done); | |
} | |
return 0; | |
} | |
static void execute_one(void) { | |
int i, call, thread; | |
for (call = 0; call < 6; call++) { | |
for (thread = 0; thread < (int)(sizeof(threads) / sizeof(threads[0])); | |
thread++) { | |
struct thread_t* th = &threads[thread]; | |
if (!th->created) { | |
th->created = 1; | |
event_init(&th->ready); | |
event_init(&th->done); | |
event_set(&th->done); | |
thread_start(thr, th); | |
} | |
if (!event_isset(&th->done)) continue; | |
event_reset(&th->done); | |
th->call = call; | |
__atomic_fetch_add(&running, 1, __ATOMIC_RELAXED); | |
event_set(&th->ready); | |
event_timedwait(&th->done, 50); | |
break; | |
} | |
} | |
for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) | |
sleep_ms(1); | |
} | |
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 (;;) { | |
if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; | |
sleep_ms(1); | |
if (current_time_ms() - start < 5000) continue; | |
kill_and_wait(pid, &status); | |
break; | |
} | |
} | |
} | |
uint64_t r[4] = {0xffffffffffffffff, 0x0, 0xffffffffffffffff, 0x0}; | |
void execute_call(int call) { | |
intptr_t res = 0; | |
switch (call) { | |
case 0: | |
memcpy((void*)0x20000080, "/dev/virtual_nci\000", 17); | |
res = syscall(__NR_openat, /*fd=*/0xffffff9cul, /*file=*/0x20000080ul, | |
/*flags=*/2ul, /*mode=*/0ul); | |
if (res != -1) r[0] = res; | |
break; | |
case 1: | |
res = syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0, /*arg=*/0x200000c0ul); | |
if (res != -1) r[1] = *(uint32_t*)0x200000c0; | |
break; | |
case 2: | |
res = -1; | |
res = syz_init_net_socket(/*domain=*/0x10, /*type=*/3, /*proto=*/0x10); | |
if (res != -1) r[2] = res; | |
break; | |
case 3: | |
memcpy((void*)0x20000100, "nfc\000", 4); | |
res = -1; | |
res = syz_genetlink_get_family_id(/*name=*/0x20000100, /*fd=*/r[2]); | |
if (res != -1) r[3] = res; | |
break; | |
case 4: | |
*(uint64_t*)0x20000140 = 0; | |
*(uint32_t*)0x20000148 = 0; | |
*(uint64_t*)0x20000150 = 0x20000180; | |
*(uint64_t*)0x20000180 = 0x200001c0; | |
*(uint32_t*)0x200001c0 = 0x1c; | |
*(uint16_t*)0x200001c4 = r[3]; | |
*(uint16_t*)0x200001c6 = 1; | |
*(uint32_t*)0x200001c8 = 0; | |
*(uint32_t*)0x200001cc = 0; | |
*(uint8_t*)0x200001d0 = 2; | |
*(uint8_t*)0x200001d1 = 0; | |
*(uint16_t*)0x200001d2 = 0; | |
*(uint16_t*)0x200001d4 = 8; | |
*(uint16_t*)0x200001d6 = 1; | |
*(uint32_t*)0x200001d8 = r[1]; | |
*(uint64_t*)0x20000188 = 0x1c; | |
*(uint64_t*)0x20000158 = 1; | |
*(uint64_t*)0x20000160 = 0; | |
*(uint64_t*)0x20000168 = 0; | |
*(uint32_t*)0x20000170 = 0; | |
syscall(__NR_sendmsg, /*fd=*/r[2], /*msg=*/0x20000140ul, /*f=*/0ul); | |
break; | |
case 5: | |
syscall(__NR_write, /*fd=*/r[0], /*data=*/0ul, /*len=*/0ul); | |
break; | |
} | |
} | |
int main(void) { | |
syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, | |
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); | |
syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, | |
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); | |
syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, | |
/*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); | |
loop(); | |
return 0; | |
} |
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r0 = openat$nci(0xffffff9c, &(0x7f0000000080), 0x2, 0x0) | |
ioctl$IOCTL_GET_NCIDEV_IDX(r0, 0x0, &(0x7f00000000c0)=<r1=>0x0) | |
r2 = syz_init_net_socket$nl_generic(0x10, 0x3, 0x10) | |
r3 = syz_genetlink_get_family_id$nfc(&(0x7f0000000100), r2) | |
sendmsg$NFC_CMD_DEV_UP(r2, &(0x7f0000000140)={0x0, 0x0, &(0x7f0000000180)={&(0x7f00000001c0)={0x1c, r3, 0x1, 0x0, 0x0, {}, [@NFC_ATTR_DEVICE_INDEX={0x8, 0x1, r1}]}, 0x1c}}, 0x0) | |
write$nci(r0, 0x0, 0x0) |
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