PROBLEM: syzkaller found / pool corruption-overwrite / page in user-area or NULL

Esme
2019-01-10T19:12:16Z

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Sorry for the resend some mail servers rejected the mime type.

Hi, I've been getting more into Kernel stuff lately and forged ahead with some syzkaller bug finding. I played with reducing it further as you can see from the attached c code but am moving on and hope to get better about this process moving forward as I'm still building out my test systems/debugging tools.

Attached is the report and C repro that still triggers on a fresh git pull as of a few minutes ago, if you need anything else please let me know.
Esme

Linux syzkaller 5.0.0-rc1+ #5 SMP Tue Jan 8 20:39:33 EST 2019 x86_64 GNU/Linux

GNU C 6.3.0
Binutils 2.28
Util-linux 2.29.2
Mount 2.29.2
Module-init-tools 23
E2fsprogs 1.43.4
Linux C Library 2.24
Dynamic linker (ldd) 2.24
Linux C++ Library 6.0.22
Procps 3.3.12
Sh-utils 8.26
Udev 232

[-- Warning: decoded text below may be mangled, UTF-8 assumed --]
[-- Attachment #2: test3.c --]
[-- Type: text/x-csrc; name="test3.c", Size: 11298 bytes --]

// autogenerated by syzkaller (https://github.com/google/syzkaller)

#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <setjmp.h>
#include <signal.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.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>

#include <linux/genetlink.h>
#include <linux/netlink.h>

unsigned long long procid;

static __thread int skip_segv;
static __thread jmp_buf segv_env;

static void segv_handler(int sig, siginfo_t* info, void* ctx)
{
uintptr_t addr = (uintptr_t)info->si_addr;
const uintptr_t prog_start = 1 << 20;
const uintptr_t prog_end = 100 << 20;
if (__atomic_load_n(&skip_segv, __ATOMIC_RELAXED) && (addr < prog_start || addr > prog_end)) {
_longjmp(segv_env, 1);
}
exit(sig);
}

static void install_segv_handler(void)
{
struct sigaction sa;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = SIG_IGN;
syscall(SYS_rt_sigaction, 0x20, &sa, NULL, 8);
syscall(SYS_rt_sigaction, 0x21, &sa, NULL, 8);
memset(&sa, 0, sizeof(sa));
sa.sa_sigaction = segv_handler;
sa.sa_flags = SA_NODEFER | SA_SIGINFO;
sigaction(SIGSEGV, &sa, NULL);
sigaction(SIGBUS, &sa, NULL);
}

#define NONFAILING(...) { __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); if (_setjmp(segv_env) == 0) { __VA_ARGS__; } __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); }

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 long syz_open_dev(long a0, long a1, long a2)
{
if (a0 == 0xc || a0 == 0xb) {
char buf[128];
sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2);
return open(buf, O_RDWR, 0);
} else {
char buf[1024];
char* hash;
NONFAILING(strncpy(buf, (char*)a0, sizeof(buf) - 1));
buf[sizeof(buf) - 1] = 0;
while ((hash = strchr(buf, '#'))) {
*hash = '0' + (char)(a1 % 10);
a1 /= 10;
}
return open(buf, a2, 0);
}
}

static long syz_open_pts(long a0, long a1)
{
int ptyno = 0;
if (ioctl(a0, TIOCGPTN, &ptyno))
return -1;
char buf[128];
sprintf(buf, "/dev/pts/%d", ptyno);
return open(buf, a1, 0);
}

static long syz_genetlink_get_family_id(long name)
{
char buf[512] = {0};
struct nlmsghdr* hdr = (struct nlmsghdr*)buf;
struct genlmsghdr* genlhdr = (struct genlmsghdr*)NLMSG_DATA(hdr);
struct nlattr* attr = (struct nlattr*)(genlhdr + 1);
hdr->nlmsg_len = sizeof(*hdr) + sizeof(*genlhdr) + sizeof(*attr) + GENL_NAMSIZ;
hdr->nlmsg_type = GENL_ID_CTRL;
hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
genlhdr->cmd = CTRL_CMD_GETFAMILY;
attr->nla_type = CTRL_ATTR_FAMILY_NAME;
attr->nla_len = sizeof(*attr) + GENL_NAMSIZ;
NONFAILING(strncpy((char*)(attr + 1), (char*)name, GENL_NAMSIZ));
struct iovec iov = {hdr, hdr->nlmsg_len};
struct sockaddr_nl addr = {0};
addr.nl_family = AF_NETLINK;
int fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_GENERIC);
if (fd == -1) {
return -1;
}
struct msghdr msg = {&addr, sizeof(addr), &iov, 1, NULL, 0, 0};
if (sendmsg(fd, &msg, 0) == -1) {
close(fd);
return -1;
}
ssize_t n = recv(fd, buf, sizeof(buf), 0);
close(fd);
if (n <= 0) {
return -1;
}
if (hdr->nlmsg_type != GENL_ID_CTRL) {
return -1;
}
for (; (char*)attr < buf + n; attr = (struct nlattr*)((char*)attr + NLMSG_ALIGN(attr->nla_len))) {
if (attr->nla_type == CTRL_ATTR_FAMILY_ID)
return *(uint16_t*)(attr + 1);
}
return -1;
}

static void kill_and_wait(int pid, int* status)
{
kill(-pid, SIGKILL);
kill(pid, SIGKILL);
int i;
for (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) {
}
}

#define SYZ_HAVE_SETUP_TEST 1
static void setup_test()
{
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
}

#define SYZ_HAVE_RESET_TEST 1
static void reset_test()
{
int fd;
for (fd = 3; fd < 30; fd++)
close(fd);
}

static void execute_one(void);

#define WAIT_FLAGS __WALL

static void loop(void)
{
int iter;
for (iter = 0;; iter++) {
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
setup_test();
execute_one();
reset_test();
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 < 5 * 1000)
continue;
kill_and_wait(pid, &status);
break;
}
}
}

uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff};

void execute_one(void)
{
long res = 0;

NONFAILING(memcpy((void*)0x20000080, "/dev/sg#\x00", 9));
res = syz_open_dev(0x20000080, 0, 0);
if (res != -1)
r[0] = res;
syscall(__NR_socket, 0xc, 0x800, 0x88);
syscall(__NR_ioctl, 0xffffff9c, 0x8933, 0);
NONFAILING(*(uint32_t*)0x200000c0 = 1);
NONFAILING(*(uint32_t*)0x200000c4 = 0);
NONFAILING(*(uint32_t*)0x200000c8 = 8);
NONFAILING(memcpy((void*)0x200000cc, "\x86", 1));
syscall(__NR_ioctl, r[0], 1, 0x200000c0);
syscall(__NR_openat, -1, 0, 0x88400, 0x100);
syscall(__NR_socket, 0x11, 2, 0x300);
syscall(__NR_write, -1, 0, 0);
syscall(__NR_getsockopt, -1, 0x29, 0x39, 0, 0);
syscall(__NR_read, -1, 0, 0);
syscall(__NR_ioctl, -1, 0x5437, 0);
syz_genetlink_get_family_id(0);
syscall(__NR_getpid);
NONFAILING(memcpy((void*)0x20000000, "/dev/loop#\x00", 11));
syz_open_dev(0x20000000, 0, 0);
syz_open_dev(0, 2, 0x100);
syscall(__NR_socket, 0x11, 3, 0x300);
/*
NONFAILING(*(uint64_t*)0x200003c0 = 0x200002c0);
NONFAILING(*(uint16_t*)0x200002c0 = 0x10);
NONFAILING(*(uint16_t*)0x200002c2 = 0);
NONFAILING(*(uint32_t*)0x200002c4 = 0);
NONFAILING(*(uint32_t*)0x200002c8 = 2);
NONFAILING(*(uint32_t*)0x200003c8 = 0xc);
NONFAILING(*(uint64_t*)0x200003d0 = 0x20000380);
NONFAILING(*(uint64_t*)0x20000380 = 0);
NONFAILING(*(uint64_t*)0x20000388 = 0);
NONFAILING(*(uint64_t*)0x200003d8 = 1);
NONFAILING(*(uint64_t*)0x200003e0 = 0);
NONFAILING(*(uint64_t*)0x200003e8 = 0);
NONFAILING(*(uint32_t*)0x200003f0 = 1);
syscall(__NR_sendmsg, -1, 0x200003c0, 0x40040);
syscall(__NR_openat, 0xffffffffffffff9c, 0, 0, 0);
res = syscall(__NR_dup, -1);
if (res != -1)
r[1] = res;
syscall(__NR_ioctl, r[1], 0x8903, 0);
syscall(__NR_fdatasync, -1);
syscall(__NR_shmctl, 0, 3, 0);
syscall(__NR_openat, 0xffffffffffffff9c, 0, 0x20000, 0);
syscall(__NR_creat, 0, 0);
syscall(__NR_fcntl, -1, 4, 0x40003);
syscall(__NR_write, -1, 0, 0);
syscall(__NR_setitimer, 1, 0, 0);
syscall(__NR_inotify_add_watch, -1, 0, 0x24000004);
syscall(__NR_unlink, 0);
NONFAILING(*(uint32_t*)0x20000180 = 0);
NONFAILING(*(uint32_t*)0x20000184 = 0);
NONFAILING(*(uint32_t*)0x20000188 = 0);
NONFAILING(*(uint32_t*)0x2000018c = 0);
NONFAILING(*(uint32_t*)0x20000190 = 0);
NONFAILING(*(uint32_t*)0x20000194 = 0);
syscall(__NR_capset, 0, 0x20000180);
NONFAILING(*(uint64_t*)0x20000100 = 0);
NONFAILING(*(uint64_t*)0x20000108 = 0);
syscall(__NR_vmsplice, -1, 0x20000100, 1, 0);
syscall(__NR_ioctl, -1, 0x89e0, 0);
syscall(__NR_socket, 0xa, 2, 0);
syscall(__NR_pipe2, 0, 0x84800);
syscall(__NR_pipe, 0);
*/
syz_open_pts(0xffffff9c, 0x80000);
syscall(__NR_socket, 0xa, 3, 0x3a);
syscall(__NR_getsockopt, 0xffffff9c, 0x29, 0x22, 0, 0);
syscall(__NR_readv, -1, 0, 0);
syscall(__NR_creat, 0, 0);
syscall(__NR_connect, -1, 0, 0);
syscall(__NR_setsockopt, -1, 1, 0x19, 0, 0);
syscall(__NR_sendmsg, -1, 0, 0x10);
syscall(__NR_socket, 0x10, 3, 0x10);
syscall(__NR_socket, 0x10, 3, 6);
syscall(__NR_openat, 0xffffffffffffff9c, 0, 0x440040, 0);
syscall(__NR_openat, 0xffffffffffffff9c, 0, 0x8000, 0);
syscall(__NR_mmap, 0x20ff7000, 0x9000, 0, 0x5811, -1, 0);
syscall(__NR_fstat, -1, 0);
syscall(__NR_ioctl, -1, 0x40247007, 0);
syscall(__NR_openat, 0xffffffffffffff9c, 0, 0x801, 0);
syscall(__NR_ioctl, -1, 0x891b, 0);
syscall(__NR_ioctl, -1, 0x541c, 0);
syscall(__NR_openat, 0xffffffffffffff9c, 0, 0x200002, 0);
syscall(__NR_socket, 2, 2, 0x88);
syscall(__NR_readv, -1, 0, 0);
syscall(__NR_pipe2, 0x20000000, 0);

}
int main(void)
{
syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0);
install_segv_handler();
for (procid = 0; procid < 8; procid++) {
if (fork() == 0) {
loop();
}
}
sleep(1000000);
return 0;
}

[-- Attachment #3: repro.report --]
[-- Type: application/octet-stream, Size: 12561 bytes --]

=============================================================================
BUG kmemleak_object (Not tainted): Padding overwritten. 0x0000000010668f30-0x00000000b5ef74a3
-----------------------------------------------------------------------------

Disabling lock debugging due to kernel taint
INFO: Slab 0x0000000008e279da objects=12 used=12 fp=0x (null) flags=0x100000000010201
CPU: 1 PID: 2098 Comm: syz-executor468 Tainted: G B 4.20.0 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1ubuntu1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xdc/0x18e lib/dump_stack.c:113
slab_err+0xab/0xcf mm/slub.c:708
slab_pad_check.part.49.cold.81+0x23/0x75 mm/slub.c:848
slab_pad_check mm/slub.c:829 [inline]
check_slab+0x6d/0xc0 mm/slub.c:934
free_debug_processing+0x205/0x260 mm/slub.c:1174
__slab_free+0x241/0x3f0 mm/slub.c:2829
qlink_free mm/kasan/quarantine.c:147 [inline]
qlist_free_all+0x4a/0xc0 mm/kasan/quarantine.c:166
quarantine_reduce+0x13e/0x160 mm/kasan/quarantine.c:259
kasan_kmalloc+0x95/0xe0 mm/kasan/kasan.c:538
slab_post_alloc_hook mm/slab.h:444 [inline]
slab_alloc_node mm/slub.c:2744 [inline]
slab_alloc mm/slub.c:2752 [inline]
kmem_cache_alloc+0xfb/0x250 mm/slub.c:2757
create_object+0xc1/0xad0 mm/kmemleak.c:578
kmemleak_alloc_recursive include/linux/kmemleak.h:55 [inline]
slab_post_alloc_hook mm/slab.h:442 [inline]
slab_alloc_node mm/slub.c:2744 [inline]
slab_alloc mm/slub.c:2752 [inline]
__kmalloc+0x1a5/0x2c0 mm/slub.c:3783
kmalloc include/linux/slab.h:551 [inline]
kzalloc include/linux/slab.h:741 [inline]
sg_scsi_ioctl+0x514/0x790 block/scsi_ioctl.c:445
sg_ioctl+0x10e0/0x2a30 drivers/scsi/sg.c:1106
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0x1d4/0x1640 fs/ioctl.c:696
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
do_syscall_64+0x15c/0x4c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44d799
Code: 00 00 00 75 05 48 83 c4 38 c3 e8 82 32 00 00 66 90 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 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc091798f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044d799
RDX: 00000000200000c0 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007ffc091799bc R08: 000000000000049f R09: 000000000000049f
R10: 000000000000049f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000004be018 R15: 0000000000000000
Padding 0000000010668f30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000662c67d6: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 000000001db2b4ef: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 0000000096e07791: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 000000002ec58a8a: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000b2946b0d: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 0000000099e025a4: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 000000002ba4e693: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 000000007d7ee36c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000d4eb8c88: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 000000005b3f661d: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 0000000084b85032: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000f8f63693: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000c63dbbc1: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000e6e42dee: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 000000000f7fdb85: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000a10620fb: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000cfc26d57: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 0000000049253b94: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Padding 00000000e1786c5e: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
FIX kmemleak_object: Restoring 0x0000000010668f30-0x00000000b5ef74a3=0x5a

=============================================================================
BUG kmemleak_object (Tainted: G B ): Redzone overwritten
-----------------------------------------------------------------------------

INFO: 0x00000000445104b3-0x0000000016f5245b. First byte 0x0 instead of 0xcc
INFO: Slab 0x0000000008e279da objects=12 used=12 fp=0x (null) flags=0x100000000010201
INFO: Object 0x000000001cc31f05 @offset=5256 fp=0x (null)

Redzone 00000000445104b3: 00 00 00 00 00 00 00 00 ........
Object 000000001cc31f05: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 000000000c167900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 000000009b6650d8: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000ae424d1e: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000c211cd23: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000556bb10a: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000f1c56b7a: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000c228871c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 0000000035c38d94: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000bdf01376: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 000000005d08d28e: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 0000000053f1468c: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000aba1cdfd: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 0000000001403e97: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000f9c746df: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000f996b51f: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000bca8e4cd: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 000000002ecac069: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Object 00000000cb0a63f5: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
Redzone 00000000bbe98e22: 00 00 00 00 00 00 00 00 ........
Padding 000000002205a78c: 00 00 00 00 00 00 00 00 ........
CPU: 1 PID: 2098 Comm: syz-executor468 Tainted: G B 4.20.0 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1ubuntu1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xdc/0x18e lib/dump_stack.c:113
check_bytes_and_report.cold.80+0x40/0x6f mm/slub.c:754
check_object+0x160/0x270 mm/slub.c:862
free_consistency_checks mm/slub.c:1139 [inline]
free_debug_processing+0x14a/0x260 mm/slub.c:1182
__slab_free+0x241/0x3f0 mm/slub.c:2829
qlink_free mm/kasan/quarantine.c:147 [inline]
qlist_free_all+0x4a/0xc0 mm/kasan/quarantine.c:166
quarantine_reduce+0x13e/0x160 mm/kasan/quarantine.c:259
kasan_kmalloc+0x95/0xe0 mm/kasan/kasan.c:538
slab_post_alloc_hook mm/slab.h:444 [inline]
slab_alloc_node mm/slub.c:2744 [inline]
slab_alloc mm/slub.c:2752 [inline]
kmem_cache_alloc+0xfb/0x250 mm/slub.c:2757
create_object+0xc1/0xad0 mm/kmemleak.c:578
kmemleak_alloc_recursive include/linux/kmemleak.h:55 [inline]
slab_post_alloc_hook mm/slab.h:442 [inline]
slab_alloc_node mm/slub.c:2744 [inline]
slab_alloc mm/slub.c:2752 [inline]
__kmalloc+0x1a5/0x2c0 mm/slub.c:3783
kmalloc include/linux/slab.h:551 [inline]
kzalloc include/linux/slab.h:741 [inline]
sg_scsi_ioctl+0x514/0x790 block/scsi_ioctl.c:445
sg_ioctl+0x10e0/0x2a30 drivers/scsi/sg.c:1106
vfs_ioctl fs/ioctl.c:46 [inline]
file_ioctl fs/ioctl.c:509 [inline]
do_vfs_ioctl+0x1d4/0x1640 fs/ioctl.c:696
ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
__do_sys_ioctl fs/ioctl.c:720 [inline]
__se_sys_ioctl fs/ioctl.c:718 [inline]
__x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
do_syscall_64+0x15c/0x4c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x44d799
Code: 00 00 00 75 05 48 83 c4 38 c3 e8 82 32 00 00 66 90 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 c4 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc091798f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000044d799
RDX: 00000000200000c0 RSI: 0000000000000001 RDI: 0000000000000003
RBP: 00007ffc091799bc R08: 000000000000049f R09: 000000000000049f
R10: 000000000000049f R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00000000004be018 R15: 0000000000000000
FIX kmemleak_object: Restoring 0x00000000445104b3-0x0000000016f5245b=0xcc

FIX kmemleak_object: Object at 0x000000001cc31f05 not freed
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP DEBUG_PAGEALLOC KASAN PTI
CPU: 1 PID: 2077 Comm: sshd Tainted: G B 4.20.0 #5
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.1-1ubuntu1 04/01/2014
RIP: 0010:unlink_anon_vmas+0x1a5/0x930 mm/rmap.c:388
Code: 84 8c 01 00 00 e8 6b 08 da ff 48 8d 7d 08 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 8a 05 00 00 4c 8b 65 08 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f 85 68 05 00 00 4d 8b 34 24 4d 39 fe 74 1c e8 33 08
RSP: 0018:ffff8880b9b572d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8162f177
RDX: 0000000000000000 RSI: ffffffff816787e5 RDI: ffff8880b74cc1b0
RBP: ffff8880b74cc1a8 R08: ffff8880bb180fc0 R09: 0000000024db2db2
R10: 000000001efd7fbf R11: ffff88811ab2a8fb R12: 0000000000000000
R13: fffffffffffffff0 R14: ffff888111183548 R15: 0000000000000000
FS: 00007f7b39931d40(0000) GS:ffff88811ab00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7b35737160 CR3: 00000000aedbe006 CR4: 0000000000160ee0
Call Trace:
free_pgtables+0x266/0x380 mm/memory.c:393
exit_mmap+0x28e/0x520 mm/mmap.c:3146
__mmput kernel/fork.c:1050 [inline]
mmput+0x1ca/0x4e0 kernel/fork.c:1071
exit_mm kernel/exit.c:545 [inline]
do_exit+0xa01/0x23e0 kernel/exit.c:854
do_group_exit+0x170/0x420 kernel/exit.c:970
__do_sys_exit_group kernel/exit.c:981 [inline]
__se_sys_exit_group kernel/exit.c:979 [inline]
__x64_sys_exit_group+0x3a/0x50 kernel/exit.c:979
do_syscall_64+0x15c/0x4c0 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f7b37a7a618
Code: Bad RIP value.
RSP: 002b:00007fff5ab54008 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7b37a7a618
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00007f7b37d578e0 R08: 00000000000000e7 R09: fffffffffffffe00
R10: 00007f7b35737148 R11: 0000000000000246 R12: 00007f7b37d578e0
R13: 00007f7b37d5cc20 R14: 0000000000000003 R15: 0000563c8f10be50
Modules linked in:
Dumping ftrace buffer:
(ftrace buffer empty)
---[ end trace 1a879148c41b9587 ]---
RIP: 0010:unlink_anon_vmas+0x1a5/0x930 mm/rmap.c:388
Code: 84 8c 01 00 00 e8 6b 08 da ff 48 8d 7d 08 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 8a 05 00 00 4c 8b 65 08 4c 89 e0 48 c1 e8 03 <80> 3c 18 00 0f 85 68 05 00 00 4d 8b 34 24 4d 39 fe 74 1c e8 33 08
RSP: 0018:ffff8880b9b572d8 EFLAGS: 00010246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffffff8162f177
RDX: 0000000000000000 RSI: ffffffff816787e5 RDI: ffff8880b74cc1b0
RBP: ffff8880b74cc1a8 R08: ffff8880bb180fc0 R09: 0000000024db2db2
R10: 000000001efd7fbf R11: ffff88811ab2a8fb R12: 0000000000000000
R13: fffffffffffffff0 R14: ffff888111183548 R15: 0000000000000000
FS: 00007f7b39931d40(0000) GS:ffff88811ab00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7b37a7a5ee CR3: 00000000aedbe006 CR4: 0000000000160ee0