Dear Linux Developers for Device Mapper,
We encountered "general protection fault in cleanup_mapped_device"
when testing the
device mapper driver with Syzkaller and our generated specifications.
Linux version: Linux 6.11-rc7 (da3ea35007d0af457a0afc87e84fddaebc4e0b63)
Configuration is attached.
Syz and C reproducers are as below:
```
Syzkaller hit 'general protection fault in cleanup_mapped_device' bug.
RBP: 00007ffdd7f7e1b0 R08: 0000000000000000 R09: 00007fe4862ebd75
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 00007fe486313470 R15: 0000000000000001
</TASK>
Oops: general protection fault, probably for non-canonical address
0xdffffc0000000011: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000088-0x000000000000008f]
CPU: 0 UID: 0 PID: 8387 Comm: syz-executor123 Not tainted
6.11.0-rc7-gda3ea35007d0 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:cleanup_mapped_device+0x202/0x580 drivers/md/dm.c:2198
Code: 03 80 3c 02 00 0f 85 28 03 00 00 48 8b 9d 08 02 00 00 48 b8 00
00 00 00 00 fc ff df 48 8d bb 98 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c
02 00 0f 85 19 03 00 00 48 c7 c7 00 57 39 8f 48 c7 83 98 00
RSP: 0018:ffffc9000e5f7b80 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffffff8169176c
RDX: 0000000000000011 RSI: 0000000000000004 RDI: 000000000000008c
RBP: ffff888047717000 R08: 0000000000000001 R09: fffff52001cbef62
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888047717208
R13: ffff888047717090 R14: ffff888047717208 R15: ffff88802ba3d9e8
FS: 00005555642a83c0(0000) GS:ffff88802ba00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe48631f1f8 CR3: 0000000000c22000 CR4: 0000000000750ef0
PKRU: 55555554
Call Trace:
<TASK>
alloc_dev drivers/md/dm.c:2347 [inline]
dm_create+0xf35/0x15b0 drivers/md/dm.c:2489
dev_create+0x11f/0x2a0 drivers/md/dm-ioctl.c:891
ctl_ioctl+0x6cd/0xab0 drivers/md/dm-ioctl.c:2100
dm_ctl_ioctl+0x25/0x40 drivers/md/dm-ioctl.c:2122
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:907 [inline]
__se_sys_ioctl fs/ioctl.c:893 [inline]
__x64_sys_ioctl+0x1a4/0x210 fs/ioctl.c:893
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcb/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe48629574d
Code: c3 e8 97 21 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 48 89 f8 48
89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d
01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdd7f7e178 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00007fe48629574d
RDX: 0000000020000080 RSI: 00000000c138fd03 RDI: 0000000000000003
RBP: 00007ffdd7f7e1b0 R08: 0000000000000000 R09: 00007fe4862ebd75
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 00007fe486313470 R15: 0000000000000001
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:cleanup_mapped_device+0x202/0x580 drivers/md/dm.c:2198
Code: 03 80 3c 02 00 0f 85 28 03 00 00 48 8b 9d 08 02 00 00 48 b8 00
00 00 00 00 fc ff df 48 8d bb 98 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c
02 00 0f 85 19 03 00 00 48 c7 c7 00 57 39 8f 48 c7 83 98 00
RSP: 0018:ffffc9000e5f7b80 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: fffffffffffffff4 RCX: ffffffff8169176c
RDX: 0000000000000011 RSI: 0000000000000004 RDI: 000000000000008c
RBP: ffff888047717000 R08: 0000000000000001 R09: fffff52001cbef62
R10: 0000000000000003 R11: 0000000000000000 R12: ffff888047717208
R13: ffff888047717090 R14: ffff888047717208 R15: ffff88802ba3d9e8
FS: 00005555642a83c0(0000) GS:ffff88802ba00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe48631f1f8 CR3: 0000000000c22000 CR4: 0000000000750ef0
PKRU: 55555554
----------------
Code disassembly (best guess):
0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax
6: 85 28 test %ebp,(%rax)
8: 03 00 add (%rax),%eax
a: 00 48 8b add %cl,-0x75(%rax)
d: 9d popf
e: 08 02 or %al,(%rdx)
10: 00 00 add %al,(%rax)
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 48 8d bb 98 00 00 00 lea 0x98(%rbx),%rdi
23: 48 89 fa mov %rdi,%rdx
26: 48 c1 ea 03 shr $0x3,%rdx
* 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2e: 0f 85 19 03 00 00 jne 0x34d
34: 48 c7 c7 00 57 39 8f mov $0xffffffff8f395700,%rdi
3b: 48 rex.W
3c: c7 .byte 0xc7
3d: 83 .byte 0x83
3e: 98 cwtl
Syzkaller reproducer:
# {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1
Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false
NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false
KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false
Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false
HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false
FaultCall:0 FaultNth:0}}
ioctl$KGPT_CEC_ADAP_S_LOG_ADDRS(0xffffffffffffffff, 0xc05c6104,
&(0x7f0000000080)={"8072609d", 0x4, 0x6, 0x8, 0xffff, 0x6,
"000780427bee50eb00", '\x00\a\x00', "8529b501", "3bf5c9d5",
["f1c758509a071a2ded4470ab", "fe1285a1e9c9879d543c15d2",
"d6de4e2d5ae55cebb6bac1e1", "dd8866305b4f75e67daa6d8b"]})
r0 = openat$KGPT_SYZKALM_dm_ctl(0xffffffffffffff9c, &(0x7f0000000040), 0x2, 0x0)
ioctl$KGPT_DM_DEV_STATUS(r0, 0xc138fd07,
&(0x7f0000000080)="58c18237165e55872d5dacbed6a0")
ioctl$KGPT_DM_DEV_CREATE(r0, 0xc138fd03, &(0x7f0000000080)) (fail_nth: 8)
C reproducer:
// 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 <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.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>
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;
}
static int inject_fault(int nth)
{
int fd;
fd = open("/proc/thread-self/fail-nth", O_RDWR);
if (fd == -1)
exit(1);
char buf[16];
sprintf(buf, "%d", nth);
if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf))
exit(1);
return fd;
}
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 const char* setup_fault()
{
int fd = open("/proc/self/make-it-fail", O_WRONLY);
if (fd == -1)
return "CONFIG_FAULT_INJECTION is not enabled";
close(fd);
fd = open("/proc/thread-self/fail-nth", O_WRONLY);
if (fd == -1)
return "kernel does not have systematic fault injection support";
close(fd);
static struct {
const char* file;
const char* val;
bool fatal;
} files[] = {
{"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true},
{"/sys/kernel/debug/fail_futex/ignore-private", "N", false},
{"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false},
{"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false},
{"/sys/kernel/debug/fail_page_alloc/min-order", "0", false},
};
unsigned i;
for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) {
if (!write_file(files[i].file, files[i].val)) {
if (files[i].fatal)
return "failed to write fault injection file";
}
}
return NULL;
}
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)) {
}
memcpy((void*)0x20000080, "\x80\x72\x60\x9d", 4);
*(uint16_t*)0x20000084 = 4;
*(uint8_t*)0x20000086 = 6;
*(uint8_t*)0x20000087 = 8;
*(uint32_t*)0x20000088 = 0xffff;
*(uint32_t*)0x2000008c = 6;
memcpy((void*)0x20000090,
"\x00\x07\x80\x42\x7b\xee\x50\xeb\x00\x00\x00\x00\x00\x00\x00", 15);
memcpy((void*)0x2000009f, "\000\a\000\000", 4);
memcpy((void*)0x200000a3, "\x85\x29\xb5\x01", 4);
memcpy((void*)0x200000a7, "\x3b\xf5\xc9\xd5", 4);
memcpy((void*)0x200000ab, "\xf1\xc7\x58\x50\x9a\x07\x1a\x2d\xed\x44\x70\xab",
12);
memcpy((void*)0x200000b7, "\xfe\x12\x85\xa1\xe9\xc9\x87\x9d\x54\x3c\x15\xd2",
12);
memcpy((void*)0x200000c3, "\xd6\xde\x4e\x2d\x5a\xe5\x5c\xeb\xb6\xba\xc1\xe1",
12);
memcpy((void*)0x200000cf, "\xdd\x88\x66\x30\x5b\x4f\x75\xe6\x7d\xaa\x6d\x8b",
12);
syscall(__NR_ioctl, /*fd=*/-1, /*cmd=*/0xc05c6104, /*arg=*/0x20000080ul);
memcpy((void*)0x20000040, "/dev/mapper/control\000", 20);
res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x20000040ul,
/*flags=*/2ul, /*mode=*/0ul);
if (res != -1)
r[0] = res;
memcpy((void*)0x20000080,
"\x58\xc1\x82\x37\x16\x5e\x55\x87\x2d\x5d\xac\xbe\xd6\xa0", 14);
syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc138fd07, /*arg=*/0x20000080ul);
inject_fault(8);
syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc138fd03, /*arg=*/0x20000080ul);
}
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);
const char* reason;
(void)reason;
if ((reason = setup_fault()))
printf("the reproducer may not work as expected: fault injection setup "
"failed: %s\n",
reason);
loop();
return 0;
}
```
If you have any questions or require more information, please feel
free to contact us.
Reported-by: Chenyuan Yang <chenyuan0y@xxxxxxxxx>
Best,
Chenyuan
Attachment:
config
Description: Binary data
