[syzbot] [ext4?] kernel BUG in ext4_write_inline_data_end (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 6764c317b6bb Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=132faab7e80000
kernel config: https://syzkaller.appspot.com/x/.config?x=2c0ac5dfae6ecc58
dashboard link: https://syzkaller.appspot.com/bug?extid=0c89d865531d053abb2d
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/90c636d7609b/disk-6764c317.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9d76784c4adc/vmlinux-6764c317.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4fa116a29660/bzImage-6764c317.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0c89d8...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:763!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 1 PID: 11999 Comm: syz-executor.1 Not tainted 6.8.0-rc2-syzkaller-00055-g6764c317b6bb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:ext4_write_inline_data_end+0x550/0xc20 fs/ext4/inline.c:763
Code: 25 28 00 00 00 0f 85 1d 06 00 00 48 81 c4 b0 00 00 00 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f e9 46 d6 87 08 e8 21 65 4c ff 90 <0f> 0b e8 19 65 4c ff 4d 8d 7c 24 34 4c 89 e7 e8 5c 3c 7c ff be 04
RSP: 0018:ffffc90004a3f928 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880452c82b0 RCX: ffffffff82400124
RDX: ffff888020358000 RSI: ffffffff8240049f RDI: 0000000000000001
RBP: 0000000000000020 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000004 R12: ffffea00013a6980
R13: 0000000000000020 R14: ffff8880452c8050 R15: ffffc90004a3f978
FS: 00007f1365d136c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb7e6f02425 CR3: 0000000028762000 CR4: 0000000000350ef0
Call Trace:
<TASK>
ext4_write_end+0x4af/0xed0 fs/ext4/inode.c:1284
generic_perform_write+0x33b/0x620 mm/filemap.c:3941
ext4_buffered_write_iter+0x11f/0x3d0 fs/ext4/file.c:299
ext4_file_write_iter+0x819/0x1960 fs/ext4/file.c:698
call_write_iter include/linux/fs.h:2085 [inline]
new_sync_write fs/read_write.c:497 [inline]
vfs_write+0x6e1/0x1110 fs/read_write.c:590
ksys_write+0x12f/0x260 fs/read_write.c:643
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd8/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f136507dda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f1365d130c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f13651abf80 RCX: 00007f136507dda9
RDX: 0000000000000020 RSI: 00000000200002c0 RDI: 0000000000000005
RBP: 00007f13650ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f13651abf80 R15: 00007ffc77beff18
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_write_inline_data_end+0x550/0xc20 fs/ext4/inline.c:763
Code: 25 28 00 00 00 0f 85 1d 06 00 00 48 81 c4 b0 00 00 00 44 89 f0 5b 5d 41 5c 41 5d 41 5e 41 5f e9 46 d6 87 08 e8 21 65 4c ff 90 <0f> 0b e8 19 65 4c ff 4d 8d 7c 24 34 4c 89 e7 e8 5c 3c 7c ff be 04
RSP: 0018:ffffc90004a3f928 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880452c82b0 RCX: ffffffff82400124
RDX: ffff888020358000 RSI: ffffffff8240049f RDI: 0000000000000001
RBP: 0000000000000020 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000004 R12: ffffea00013a6980
R13: 0000000000000020 R14: ffff8880452c8050 R15: ffffc90004a3f978
FS: 00007f1365d136c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffb08627d58 CR3: 0000000028762000 CR4: 0000000000350ef0


---
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If you want to undo deduplication, reply with:
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[xingwei lee]

Hello, I reproduced this bug and comfired in the latest upstream.

If you fix this issue, please add the following tag to the commit:
Reported-by: xingwei lee <xrive...@gmail.com>

Notice, I use the different kernel config with syzbot dashboard.
kernel version:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/log/?id=99bd3cb0d12e85d5114425353552121ec8f93adc
kernel config: https://gist.githubusercontent.com/xrivendell7/3e47849a9a19debf45b5829f04977c71/raw/5ec6eeb6a572480575903151e17ea9fc36fc22c4/config
with KASAN enabled
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

TITLE: kernel BUG in ext4_write_inline_data_end
------------[ cut here ]------------
kernel BUG at fs/ext4/inline.c:235!

invalid opcode: 0000 [#1] PREEMPT SMP KASAN

CPU: 3 PID: 8926 Comm: 0fe-1 Not tainted 6.8.0-rc1-00208-g6a3
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 4
RIP: 0010:ext4_write_inline_data fs/ext4/inline.c:235 [inline]
RIP: 0010:ext4_write_inline_data_end+0x8ff/0x910 fs/ext4/inline.c:773
Code: ff 0f 0b e9 2c fd ff ff 31 ff e8 dc ed a0 ff 0f 0b 31 5
RSP: 0018:ffff88814fc7f3a0 EFLAGS: 00010293
RAX: ffffffff81a200cf RBX: 000000000000003c RCX: 000000000000
RDX: 0000000000000000 RSI: ffff888149114b40 RDI: 000000000000
RBP: ffff88814fc7f4e0 R08: ffffffff81a1fab0 R09: 1ffff1102936
R10: ffffed102939c247 R11: ffffed102939c247 R12: ffffea000560
R13: ffff8881574aafe0 R14: 0000000000000000 R15: 000000000000
FS: 00007f3853cff6c0(0000) GS:ffff88823bd00000(0000) knlGS:0

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 0000000020000040 CR3: 000000000f4fb000 CR4: 000000000070
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 000000000000
PKRU: 55555554
Call Trace:
<TASK>
ext4_da_write_end+0x1a9/0x800 fs/ext4/inode.c:3028
generic_perform_write+0x2c9/0x4a0 mm/filemap.c:3941
ext4_buffered_write_iter+0x9e/0x210 fs/ext4/file.c:299
ext4_file_write_iter+0x16d/0x12e0 fs/ext4/file.c:698
call_write_iter include/linux/fs.h:2085 [inline]
iter_file_splice_write+0x792/0xc10 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
direct_splice_actor+0x17f/0x2e0 fs/splice.c:1164
splice_direct_to_actor+0x3dd/0x770 fs/splice.c:1108
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x18e/0x220 fs/splice.c:1233
do_sendfile+0x46f/0xa30 fs/read_write.c:1295
__do_sys_sendfile64 fs/read_write.c:1362 [inline]
__se_sys_sendfile64 fs/read_write.c:1348 [inline]
__x64_sys_sendfile64+0x151/0x190 fs/read_write.c:1348
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0x59/0x120 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

Remember to run this repro.txt with the command: syz-execprog -repeat
0 ./repro.txt and wait for about 3-4minus, the bug triggered very
steady.

=* repro.c =*
#define _GNU_SOURCE

#include <dirent.h>
#include <endian.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <setjmp.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/ioctl.h>
#include <sys/mman.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/futex.h>
#include <linux/loop.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif

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 void use_temporary_dir(void) {
char tmpdir_template[] = "./syzkaller.XXXXXX";
char* tmpdir = mkdtemp(tmpdir_template);
if (!tmpdir)
exit(1);
if (chmod(tmpdir, 0777))
exit(1);
if (chdir(tmpdir))
exit(1);
}

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;
}

//% This code is derived from puff.{c,h}, found in the zlib development. The
//% original files come with the following copyright notice:

//% Copyright (C) 2002-2013 Mark Adler, all rights reserved
//% version 2.3, 21 Jan 2013
//% This software is provided 'as-is', without any express or implied
//% warranty. In no event will the author be held liable for any damages
//% arising from the use of this software.
//% Permission is granted to anyone to use this software for any purpose,
//% including commercial applications, and to alter it and redistribute it
//% freely, subject to the following restrictions:
//% 1. The origin of this software must not be misrepresented; you must not
//% claim that you wrote the original software. If you use this software
//% in a product, an acknowledgment in the product documentation would be
//% appreciated but is not required.
//% 2. Altered source versions must be plainly marked as such, and must not be
//% misrepresented as being the original software.
//% 3. This notice may not be removed or altered from any source distribution.
//% Mark Adler mad...@alumni.caltech.edu

//% BEGIN CODE DERIVED FROM puff.{c,h}

#define MAXBITS 15
#define MAXLCODES 286
#define MAXDCODES 30
#define MAXCODES (MAXLCODES + MAXDCODES)
#define FIXLCODES 288

struct puff_state {
unsigned char* out;
unsigned long outlen;
unsigned long outcnt;
const unsigned char* in;
unsigned long inlen;
unsigned long incnt;
int bitbuf;
int bitcnt;
jmp_buf env;
};
static int puff_bits(struct puff_state* s, int need) {
long val = s->bitbuf;
while (s->bitcnt < need) {
if (s->incnt == s->inlen)
longjmp(s->env, 1);
val |= (long)(s->in[s->incnt++]) << s->bitcnt;
s->bitcnt += 8;
}
s->bitbuf = (int)(val >> need);
s->bitcnt -= need;
return (int)(val & ((1L << need) - 1));
}
static int puff_stored(struct puff_state* s) {
s->bitbuf = 0;
s->bitcnt = 0;
if (s->incnt + 4 > s->inlen)
return 2;
unsigned len = s->in[s->incnt++];
len |= s->in[s->incnt++] << 8;
if (s->in[s->incnt++] != (~len & 0xff) ||
s->in[s->incnt++] != ((~len >> 8) & 0xff))
return -2;
if (s->incnt + len > s->inlen)
return 2;
if (s->outcnt + len > s->outlen)
return 1;
for (; len--; s->outcnt++, s->incnt++) {
if (s->in[s->incnt])
s->out[s->outcnt] = s->in[s->incnt];
}
return 0;
}
struct puff_huffman {
short* count;
short* symbol;
};
static int puff_decode(struct puff_state* s, const struct puff_huffman* h) {
int first = 0;
int index = 0;
int bitbuf = s->bitbuf;
int left = s->bitcnt;
int code = first = index = 0;
int len = 1;
short* next = h->count + 1;
while (1) {
while (left--) {
code |= bitbuf & 1;
bitbuf >>= 1;
int count = *next++;
if (code - count < first) {
s->bitbuf = bitbuf;
s->bitcnt = (s->bitcnt - len) & 7;
return h->symbol[index + (code - first)];
}
index += count;
first += count;
first <<= 1;
code <<= 1;
len++;
}
left = (MAXBITS + 1) - len;
if (left == 0)
break;
if (s->incnt == s->inlen)
longjmp(s->env, 1);
bitbuf = s->in[s->incnt++];
if (left > 8)
left = 8;
}
return -10;
}
static int puff_construct(struct puff_huffman* h, const short* length, int n) {
int len;
for (len = 0; len <= MAXBITS; len++)
h->count[len] = 0;
int symbol;
for (symbol = 0; symbol < n; symbol++)
(h->count[length[symbol]])++;
if (h->count[0] == n)
return 0;
int left = 1;
for (len = 1; len <= MAXBITS; len++) {
left <<= 1;
left -= h->count[len];
if (left < 0)
return left;
}
short offs[MAXBITS + 1];
offs[1] = 0;
for (len = 1; len < MAXBITS; len++)
offs[len + 1] = offs[len] + h->count[len];
for (symbol = 0; symbol < n; symbol++)
if (length[symbol] != 0)
h->symbol[offs[length[symbol]]++] = symbol;
return left;
}
static int puff_codes(struct puff_state* s,
const struct puff_huffman* lencode,
const struct puff_huffman* distcode) {
static const short lens[29] = {3, 4, 5, 6, 7, 8, 9, 10, 11, 13,
15, 17, 19, 23, 27, 31, 35, 43, 51, 59,
67, 83, 99, 115, 131, 163, 195, 227, 258};
static const short lext[29] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2,
2, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5, 0};
static const short dists[30] = {
1, 2, 3, 4, 5, 7, 9, 13, 17, 25,
33, 49, 65, 97, 129, 193, 257, 385, 513, 769,
1025, 1537, 2049, 3073, 4097, 6145, 8193, 12289, 16385, 24577};
static const short dext[30] = {0, 0, 0, 0, 1, 1, 2, 2, 3, 3,
4, 4, 5, 5, 6, 6, 7, 7, 8, 8,
9, 9, 10, 10, 11, 11, 12, 12, 13, 13};
int symbol;
do {
symbol = puff_decode(s, lencode);
if (symbol < 0)
return symbol;
if (symbol < 256) {
if (s->outcnt == s->outlen)
return 1;
if (symbol)
s->out[s->outcnt] = symbol;
s->outcnt++;
} else if (symbol > 256) {
symbol -= 257;
if (symbol >= 29)
return -10;
int len = lens[symbol] + puff_bits(s, lext[symbol]);
symbol = puff_decode(s, distcode);
if (symbol < 0)
return symbol;
unsigned dist = dists[symbol] + puff_bits(s, dext[symbol]);
if (dist > s->outcnt)
return -11;
if (s->outcnt + len > s->outlen)
return 1;
while (len--) {
if (dist <= s->outcnt && s->out[s->outcnt - dist])
s->out[s->outcnt] = s->out[s->outcnt - dist];
s->outcnt++;
}
}
} while (symbol != 256);
return 0;
}
static int puff_fixed(struct puff_state* s) {
static int virgin = 1;
static short lencnt[MAXBITS + 1], lensym[FIXLCODES];
static short distcnt[MAXBITS + 1], distsym[MAXDCODES];
static struct puff_huffman lencode, distcode;
if (virgin) {
lencode.count = lencnt;
lencode.symbol = lensym;
distcode.count = distcnt;
distcode.symbol = distsym;
short lengths[FIXLCODES];
int symbol;
for (symbol = 0; symbol < 144; symbol++)
lengths[symbol] = 8;
for (; symbol < 256; symbol++)
lengths[symbol] = 9;
for (; symbol < 280; symbol++)
lengths[symbol] = 7;
for (; symbol < FIXLCODES; symbol++)
lengths[symbol] = 8;
puff_construct(&lencode, lengths, FIXLCODES);
for (symbol = 0; symbol < MAXDCODES; symbol++)
lengths[symbol] = 5;
puff_construct(&distcode, lengths, MAXDCODES);
virgin = 0;
}
return puff_codes(s, &lencode, &distcode);
}
static int puff_dynamic(struct puff_state* s) {
static const short order[19] = {16, 17, 18, 0, 8, 7, 9, 6, 10, 5,
11, 4, 12, 3, 13, 2, 14, 1, 15};
int nlen = puff_bits(s, 5) + 257;
int ndist = puff_bits(s, 5) + 1;
int ncode = puff_bits(s, 4) + 4;
if (nlen > MAXLCODES || ndist > MAXDCODES)
return -3;
short lengths[MAXCODES];
int index;
for (index = 0; index < ncode; index++)
lengths[order[index]] = puff_bits(s, 3);
for (; index < 19; index++)
lengths[order[index]] = 0;
short lencnt[MAXBITS + 1], lensym[MAXLCODES];
struct puff_huffman lencode = {lencnt, lensym};
int err = puff_construct(&lencode, lengths, 19);
if (err != 0)
return -4;
index = 0;
while (index < nlen + ndist) {
int symbol;
int len;
symbol = puff_decode(s, &lencode);
if (symbol < 0)
return symbol;
if (symbol < 16)
lengths[index++] = symbol;
else {
len = 0;
if (symbol == 16) {
if (index == 0)
return -5;
len = lengths[index - 1];
symbol = 3 + puff_bits(s, 2);
} else if (symbol == 17)
symbol = 3 + puff_bits(s, 3);
else
symbol = 11 + puff_bits(s, 7);
if (index + symbol > nlen + ndist)
return -6;
while (symbol--)
lengths[index++] = len;
}
}
if (lengths[256] == 0)
return -9;
err = puff_construct(&lencode, lengths, nlen);
if (err && (err < 0 || nlen != lencode.count[0] + lencode.count[1]))
return -7;
short distcnt[MAXBITS + 1], distsym[MAXDCODES];
struct puff_huffman distcode = {distcnt, distsym};
err = puff_construct(&distcode, lengths + nlen, ndist);
if (err && (err < 0 || ndist != distcode.count[0] + distcode.count[1]))
return -8;
return puff_codes(s, &lencode, &distcode);
}
static int puff(unsigned char* dest,
unsigned long* destlen,
const unsigned char* source,
unsigned long sourcelen) {
struct puff_state s = {
.out = dest,
.outlen = *destlen,
.outcnt = 0,
.in = source,
.inlen = sourcelen,
.incnt = 0,
.bitbuf = 0,
.bitcnt = 0,
};
int err;
if (setjmp(s.env) != 0)
err = 2;
else {
int last;
do {
last = puff_bits(&s, 1);
int type = puff_bits(&s, 2);
err = type == 0 ? puff_stored(&s)
: (type == 1 ? puff_fixed(&s)
: (type == 2 ? puff_dynamic(&s) : -1));
if (err != 0)
break;
} while (!last);
}
*destlen = s.outcnt;
return err;
}

//% END CODE DERIVED FROM puff.{c,h}

#define ZLIB_HEADER_WIDTH 2

static int puff_zlib_to_file(const unsigned char* source,
unsigned long sourcelen,
int dest_fd) {
if (sourcelen < ZLIB_HEADER_WIDTH)
return 0;
source += ZLIB_HEADER_WIDTH;
sourcelen -= ZLIB_HEADER_WIDTH;
const unsigned long max_destlen = 132 << 20;
void* ret = mmap(0, max_destlen, PROT_WRITE | PROT_READ,
MAP_PRIVATE | MAP_ANON, -1, 0);
if (ret == MAP_FAILED)
return -1;
unsigned char* dest = (unsigned char*)ret;
unsigned long destlen = max_destlen;
int err = puff(dest, &destlen, source, sourcelen);
if (err) {
munmap(dest, max_destlen);
errno = -err;
return -1;
}
if (write(dest_fd, dest, destlen) != (ssize_t)destlen) {
munmap(dest, max_destlen);
return -1;
}
return munmap(dest, max_destlen);
}

static int setup_loop_device(unsigned char* data,
unsigned long size,
const char* loopname,
int* loopfd_p) {
int err = 0, loopfd = -1;
int memfd = syscall(__NR_memfd_create, "syzkaller", 0);
if (memfd == -1) {
err = errno;
goto error;
}
if (puff_zlib_to_file(data, size, memfd)) {
err = errno;
goto error_close_memfd;
}
loopfd = open(loopname, O_RDWR);
if (loopfd == -1) {
err = errno;
goto error_close_memfd;
}
if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
if (errno != EBUSY) {
err = errno;
goto error_close_loop;
}
ioctl(loopfd, LOOP_CLR_FD, 0);
usleep(1000);
if (ioctl(loopfd, LOOP_SET_FD, memfd)) {
err = errno;
goto error_close_loop;
}
}
close(memfd);
*loopfd_p = loopfd;
return 0;

error_close_loop:
close(loopfd);
error_close_memfd:
close(memfd);
error:
errno = err;
return -1;
}

static long syz_mount_image(volatile long fsarg,
volatile long dir,
volatile long flags,
volatile long optsarg,
volatile long change_dir,
volatile unsigned long size,
volatile long image) {
unsigned char* data = (unsigned char*)image;
int res = -1, err = 0, loopfd = -1, need_loop_device = !!size;
char* mount_opts = (char*)optsarg;
char* target = (char*)dir;
char* fs = (char*)fsarg;
char* source = NULL;
char loopname[64];
if (need_loop_device) {
memset(loopname, 0, sizeof(loopname));
snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid);
if (setup_loop_device(data, size, loopname, &loopfd) == -1)
return -1;
source = loopname;
}
mkdir(target, 0777);
char opts[256];
memset(opts, 0, sizeof(opts));
if (strlen(mount_opts) > (sizeof(opts) - 32)) {
}
strncpy(opts, mount_opts, sizeof(opts) - 32);
if (strcmp(fs, "iso9660") == 0) {
flags |= MS_RDONLY;
} else if (strncmp(fs, "ext", 3) == 0) {
bool has_remount_ro = false;
char* remount_ro_start = strstr(opts, "errors=remount-ro");
if (remount_ro_start != NULL) {
char after = *(remount_ro_start + strlen("errors=remount-ro"));
char before = remount_ro_start == opts ? '\0' : *(remount_ro_start - 1);
has_remount_ro = ((before == '\0' || before == ',') &&
(after == '\0' || after == ','));
}
if (strstr(opts, "errors=panic") || !has_remount_ro)
strcat(opts, ",errors=continue");
} else if (strcmp(fs, "xfs") == 0) {
strcat(opts, ",nouuid");
}
res = mount(source, target, fs, flags, opts);
if (res == -1) {
err = errno;
goto error_clear_loop;
}
res = open(target, O_RDONLY | O_DIRECTORY);
if (res == -1) {
err = errno;
goto error_clear_loop;
}
if (change_dir) {
res = chdir(target);
if (res == -1) {
err = errno;
}
}

error_clear_loop:
if (need_loop_device) {
ioctl(loopfd, LOOP_CLR_FD, 0);
close(loopfd);
}
errno = err;
return res;
}

#define FS_IOC_SETFLAGS _IOW('f', 2, long)
static void remove_dir(const char* dir) {
int iter = 0;
DIR* dp = 0;
retry:
while (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) {
}
dp = opendir(dir);
if (dp == NULL) {
if (errno == EMFILE) {
exit(1);
}
exit(1);
}
struct dirent* ep = 0;
while ((ep = readdir(dp))) {
if (strcmp(ep->d_name, ".") == 0 || strcmp(ep->d_name, "..") == 0)
continue;
char filename[FILENAME_MAX];
snprintf(filename, sizeof(filename), "%s/%s", dir, ep->d_name);
while (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW) == 0) {
}
struct stat st;
if (lstat(filename, &st))
exit(1);
if (S_ISDIR(st.st_mode)) {
remove_dir(filename);
continue;
}
int i;
for (i = 0;; i++) {
if (unlink(filename) == 0)
break;
if (errno == EPERM) {
int fd = open(filename, O_RDONLY);
if (fd != -1) {
long flags = 0;
if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
}
close(fd);
continue;
}
}
if (errno == EROFS) {
break;
}
if (errno != EBUSY || i > 100)
exit(1);
if (umount2(filename, MNT_DETACH | UMOUNT_NOFOLLOW))
exit(1);
}
}
closedir(dp);
for (int i = 0;; i++) {
if (rmdir(dir) == 0)
break;
if (i < 100) {
if (errno == EPERM) {
int fd = open(dir, O_RDONLY);
if (fd != -1) {
long flags = 0;
if (ioctl(fd, FS_IOC_SETFLAGS, &flags) == 0) {
}
close(fd);
continue;
}
}
if (errno == EROFS) {
break;
}
if (errno == EBUSY) {
if (umount2(dir, MNT_DETACH | UMOUNT_NOFOLLOW))
exit(1);
continue;
}
if (errno == ENOTEMPTY) {
if (iter < 100) {
iter++;
goto retry;
}
}
}
exit(1);
}
}

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 reset_loop() {
char buf[64];
snprintf(buf, sizeof(buf), "/dev/loop%llu", procid);
int loopfd = open(buf, O_RDWR);
if (loopfd != -1) {
ioctl(loopfd, LOOP_CLR_FD, 0);
close(loopfd);
}
}

static void setup_test() {
prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0);
setpgrp();
write_file("/proc/self/oom_score_adj", "1000");
if (symlink("/dev/binderfs", "./binderfs")) {
}
}

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 < 7; 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);
if (call == 4 || call == 5)
break;
event_timedwait(&th->done, 50 + (call == 0 ? 4000 : 0));
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++) {
char cwdbuf[32];
sprintf(cwdbuf, "./%d", iter);
if (mkdir(cwdbuf, 0777))
exit(1);
reset_loop();
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
if (chdir(cwdbuf))
exit(1);
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;
}
remove_dir(cwdbuf);
}
}

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

void execute_call(int call) {
intptr_t res = 0;
switch (call) {
case 0:
memcpy((void*)0x20000780, "ext4\000", 5);
memcpy((void*)0x20000240, "./file0\000", 8);
memcpy(
(void*)0x20000f40,
"\x78\x9c\xec\xdd\xdd\x6b\x5b\xe5\x1f\x00\xf0\xef\x49\xdf\xd6\x6e\xbf"
"\x5f\x2b\x08\x3a\xaf\x0a\x82\x16\xc6\x52\x3b\xeb\xa6\xe0\xc5\xc4\x0b"
"\x11\x1c\x0c\xf4\xda\xad\xa4\x59\x99\x4d\x9b\xd1\xa4\x63\x2d\x05\x37"
"\x44\xf0\x46\x50\xf1\x42\xd0\x9b\x5d\xfb\x32\xef\xbc\xf5\xe5\x56\xff"
"\x0b\x2f\x64\x63\x6a\x37\x9c\x78\x21\x95\x93\x9e\x74\xd9\x9a\x64\xe9"
"\xd6\x97\x8d\x7c\x3e\x70\x9a\xe7\xc9\x39\xe9\xf7\xf9\xe6\x39\x2f\xcf"
"\xc9\x39\x24\x01\x74\xad\xd1\xf4\x4f\x2e\xe2\x60\x44\x7c\x94\x44\x0c"
"\x67\xcf\x27\x11\xd1\x57\x2b\xf5\x46\x1c\x5f\x5f\xee\xd6\xea\x4a\x21"
"\x9d\x92\x58\x5b\x7b\xf3\x8f\xa4\xb6\xcc\xcd\xd5\x95\x42\x34\xbc\x26"
"\xb5\x3f\xab\x3c\x19\x11\x3f\xbe\x1f\x71\x28\xb7\x39\x6e\x65\x69\x79"
"\x76\xaa\x54\x2a\x2e\x64\xf5\xf1\xea\xdc\xb9\xf1\xca\xd2\xf2\xe1\xb3"
"\x73\x53\x33\xc5\x99\xe2\xfc\xd1\x89\xc9\xc9\x23\xc7\x5e\x38\x76\x74"
"\xfb\x72\xfd\xeb\x97\xe5\x03\xd7\x3e\x7e\xed\xd9\x6f\x8e\xff\xf3\xde"
"\x13\x57\x3e\xfc\x29\x89\xe3\x71\x20\x9b\xd7\x98\xc7\x76\x19\x8d\xd1"
"\xec\x3d\xe9\x4b\xdf\xc2\x3b\xbc\xba\xdd\xc1\xf6\x58\xb2\xd7\x0d\xe0"
"\xbe\xa4\x9b\x66\xcf\xfa\x56\x1e\x07\x63\x38\x7a\x6a\xa5\x16\x06\x77"
"\xb3\x65\x00\xc0\x4e\x79\x37\x22\xd6\x00\x80\x2e\x93\x38\xfe\x03\x40"
"\x97\xa9\x7f\x0e\x70\x73\x75\xa5\x50\x9f\xda\x7c\x5c\xd0\xe6\xe2\xc0"
"\xa3\xe9\xfa\x2b\x11\xb1\x6f\x3d\xff\xfa\xf5\xcd\xf5\x39\xbd\xd9\x35"
"\xbb\x7d\xb5\xeb\xa0\x43\x37\x93\x3b\x92\x4f\x22\x62\x64\x1b\xe2\x8f"
"\x46\xc4\x17\xdf\xbd\xfd\x55\x3a\xc5\x0e\x5d\x87\x04\x68\xe6\xe2\xa5"
"\x88\x38\x3d\x32\xba\x79\xff\x9f\x6c\xba\x67\x61\xab\x9e\xeb\x60\x99"
"\xd1\xbb\xea\x0d\xfb\xbf\xfe\x07\x0c\x0f\xdc\xc3\xf7\xe9\xf8\xe7\xc5"
"\x66\xe3\xbf\xdc\xc6\xf8\x27\x9a\x8c\x7f\x06\x9a\x6c\xbb\xf7\xa3\xcd"
"\xf6\x9f\xc9\x5d\xdd\x86\x30\x2d\xa5\xe3\xbf\x97\x1b\xee\x6d\xbb\xd5"
"\x90\x7f\x66\xa4\x27\xab\xfd\xaf\x36\xe6\xeb\x4b\xce\x9c\x2d\x15\xd3"
"\x7d\xdb\xff\x23\x62\x2c\xfa\x06\xd2\xfa\x44\x9b\x18\x63\x37\xfe\xbd"
"\xd1\x6a\x5e\xe3\xf8\xef\xcf\x4f\xde\xf9\x32\x8d\x9f\x3e\xde\x5e\x22"
"\x77\xb5\x77\xe0\xce\xd7\x4c\x4f\x55\xa7\x1e\x24\xe7\x46\xd7\x2f\x45"
"\x3c\xd5\xdb\x2c\xff\x64\xa3\xff\x93\x16\xe3\xdf\x93\x1d\xc6\x78\xfd"
"\xa5\x0f\x3e\x6f\x35\x2f\xcd\x3f\xcd\xb7\x3e\x6d\xce\x7f\x67\xad\x5d"
"\x8e\x78\xa6\x69\xff\xdf\xbe\xa3\x2d\x69\x7b\x7f\xe2\x78\x6d\x75\x18"
"\xaf\xaf\x14\x4d\x7c\xfb\xeb\x67\x43\xad\xe2\x37\xf6\x7f\x3a\xa5\xf1"
"\xeb\xe7\x02\xbb\x21\xed\xff\xa1\xf6\xf9\x8f\x24\x8d\xf7\x6b\x56\xb6"
"\x1e\xe3\xe7\xcb\xc3\x3f\xb4\x9a\x77\xef\xfc\x9b\xaf\xff\xfd\xc9\x5b"
"\xb5\x72\x7d\x90\x70\x61\xaa\x5a\x5d\x98\x88\xe8\x4f\xde\xd8\xfc\xfc"
"\x91\xdb\xaf\xad\xd7\xeb\xcb\xa7\xf9\x8f\x3d\xdd\xdf\x74\xfb\x6f\xb7"
"\xfe\xa7\xe7\x84\xa7\x3b\xcc\xbf\xf7\xda\xef\x5f\x6f\x54\xee\x3a\xf1"
"\x7e\x18\xfa\x7f\x7a\x4b\xfd\xbf\xf5\xc2\x95\x5b\xb3\x3d\xad\xe2\x77"
"\xd6\xff\x93\xb5\xd2\x58\xf6\x4c\x27\xfb\xbf\x4e\x1b\xf8\x20\xef\x1d"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x74\x2a\x17\x11\x07\x22\xc9\xe5\x37\xca\xb9\x5c\x3e\xbf\xfe"
"\x1b\xde\x8f\xc7\x50\xae\x54\xae\x54\x0f\x9d\x29\x2f\xce\x4f\x47\xed"
"\xb7\xb2\x47\xa2\x2f\x57\xff\xaa\xcb\xe1\x86\xef\x43\x9d\xc8\xbe\x0f"
"\xbf\x5e\x3f\x72\x57\xfd\xf9\x88\x78\x2c\x22\x3e\x1d\x18\xac\xd5\xf3"
"\x85\x72\x69\x7a\xaf\x93\x07\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x80\xcc\xfe\x16\xbf\xff\x9f\xfa\x6d\x60\xaf\x5b\x07\x00"
"\xec\x98\x7d\x7b\xdd\x00\x00\x60\xd7\x39\xfe\x03\x40\xf7\xd9\xda\xf1"
"\x7f\x70\xc7\xda\x01\x00\xec\x1e\xe7\xff\x00\xd0\x7d\x1c\xff\x01\xa0"
"\xfb\x38\xfe\x03\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\xb0\xc3\x4e\x9e\x38\x91\x4e\x6b\x7f\xaf\xae\x14\xd2\xfa"
"\xf4\xf9\xa5\xc5\xd9\xf2\xf9\xc3\xd3\xc5\xca\x6c\x7e\x6e\xb1\x90\x2f"
"\x94\x17\xce\xe5\x67\xca\xe5\x99\x52\x31\x5f\x28\xcf\xb5\xfc\x47\x17"
"\xd7\x1f\x4a\xe5\xf2\xb9\xc9\x98\x5f\xbc\x30\x5e\x2d\x56\xaa\xe3\x95"
"\xa5\xe5\x53\x73\xe5\xc5\xf9\xea\xa9\xb3\x73\x53\x33\xc5\x53\xc5\xbe"
"\x5d\xcb\x0c\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x3a\x57\x59\x5a\x9e\x9d\x2a\x95\x8a\x0b\x0a\xdd\x57\xe8\xc9\x56\x82"
"\x87\xa5\x3d\x0a\x0f\x51\xa1\x71\x2f\x31\xb8\x37\x3b\x27\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x80\x47\xc0\x7f\x01\x00\x00\xff\xff\x51\xe3\x2f\x55",
1919);
syz_mount_image(/*fs=*/0x20000780, /*dir=*/0x20000240, /*flags=*/0,
/*opts=*/0x20000000, /*chdir=*/1, /*size=*/0x77f,
/*img=*/0x20000f40);
break;
case 1:
memcpy((void*)0x20000000, "./bus\000", 6);
res = syscall(__NR_open, /*file=*/0x20000000ul, /*flags=*/0x60142ul,
/*mode=*/0ul);
if (res != -1)
r[0] = res;
break;
case 2:
memcpy((void*)0x20007f80, "./bus\000", 6);
res = syscall(__NR_open, /*file=*/0x20007f80ul, /*flags=*/0x145142ul,
/*mode=*/0ul);
if (res != -1)
r[1] = res;
break;
case 3:
syscall(__NR_ftruncate, /*fd=*/r[1], /*len=*/0x2007ffbul);
break;
case 4:
*(uint64_t*)0x20000040 = 0;
syscall(__NR_sendfile, /*fdout=*/r[0], /*fdin=*/r[1],
/*off=*/0x20000040ul,
/*count=*/4ul);
break;
case 5:
syscall(__NR_sendfile, /*fdout=*/r[0], /*fdin=*/r[1], /*off=*/0ul,
/*count=*/0x1000000201005ul);
break;
case 6:
syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0xb36000ul,
/*prot=*/2ul,
/*flags=*/0x28011ul, /*fd=*/r[1], /*offset=*/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);
use_temporary_dir();
loop();
return 0;
}

=* repro.txt =*
syz_mount_image$ext4(&(0x7f0000000780)='ext4\x00',
&(0x7f0000000240)='./file0\x00', 0x0, &(0x7f0000000000)=ANY=[], 0x1,
0x77f, &(0x7f0000000f40)="$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")
r0 = open(&(0x7f0000000000)='./bus\x00', 0x60142, 0x0)
r1 = open(&(0x7f0000007f80)='./bus\x00', 0x145142, 0x0)
ftruncate(r1, 0x2007ffb)
sendfile(r0, r1, &(0x7f0000000040), 0x4) (async)
sendfile(r0, r1, 0x0, 0x1000000201005) (async)
mmap(&(0x7f0000000000/0xb36000)=nil, 0xb36000, 0x2, 0x28011, r1, 0x0)

and see also in
https://gist.github.com/xrivendell7/3e47849a9a19debf45b5829f04977c71

BTW, in the reproducing process, I also reproduced bug titled
kernel BUG in __ext4_journal_stop
https://syzkaller.appspot.com/bug?extid=bdab24d5bf96d57c50b0
and kernel BUG in ext4_do_writepages
https://syzkaller.appspot.com/bug?extid=d1da16f03614058fdc48, they
maybe the same bugs I guess.

I hope it helps.
Best regrads.
xingwei Lee

[syzbot]

syzbot has found a reproducer for the following issue on:

HEAD commit: 99bd3cb0d12e Merge tag 'bcachefs-2024-02-05' of https://ev..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14b32118180000
kernel config: https://syzkaller.appspot.com/x/.config?x=89a5d896b14c4565
dashboard link: https://syzkaller.appspot.com/bug?extid=0c89d865531d053abb2d
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16cffe18180000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15e0d68fe80000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/73aa72bd3577/disk-99bd3cb0.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/6c6bf1614995/vmlinux-99bd3cb0.xz
kernel image: https://storage.googleapis.com/syzbot-assets/7df252d11788/bzImage-99bd3cb0.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/584587b5a4f4/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+0c89d8...@syzkaller.appspotmail.com

------------[ cut here ]------------

kernel BUG at fs/ext4/inline.c:235!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 PID: 5172 Comm: syz-executor299 Not tainted 6.8.0-rc3-syzkaller-00005-g99bd3cb0d12e #0

Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024

RIP: 0010:ext4_write_inline_data fs/ext4/inline.c:235 [inline]

RIP: 0010:ext4_write_inline_data_end+0xea1/0x1020 fs/ext4/inline.c:773
Code: 31 ff e8 92 d9 44 ff 48 89 d8 48 25 ff 0f 00 00 74 70 e8 a2 d4 44 ff e9 12 f8 ff ff e8 98 d4 44 ff 90 0f 0b e8 90 d4 44 ff 90 <0f> 0b 48 8b 5c 24 18 48 89 df be 08 00 00 00 e8 bb a4 a3 ff 48 c1
RSP: 0018:ffffc90004957300 EFLAGS: 00010293
RAX: ffffffff824e91a0 RBX: 0000000000000042 RCX: ffff888029e48000
RDX: 0000000000000000 RSI: 0000000000000042 RDI: 0000000000000043
RBP: ffffc90004957428 R08: ffffffff824e86f9 R09: 1ffff11005ffe070
R10: dffffc0000000000 R11: ffffed1005ffe071 R12: ffff888067134e6a
R13: 0000000000000042 R14: 0000000000000043 R15: 0000000000000001
FS: 00007f92340b76c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f9234096d58 CR3: 000000007218c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
generic_perform_write+0x424/0x640 mm/filemap.c:3941
ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299
ext4_file_write_iter+0x1dc/0x19c0
call_write_iter include/linux/fs.h:2085 [inline]
iter_file_splice_write+0xbd6/0x14e0 fs/splice.c:743
do_splice_from fs/splice.c:941 [inline]
direct_splice_actor+0x11e/0x220 fs/splice.c:1164
splice_direct_to_actor+0x58d/0xc80 fs/splice.c:1108
do_splice_direct_actor fs/splice.c:1207 [inline]
do_splice_direct+0x28c/0x3e0 fs/splice.c:1233
do_sendfile+0x56d/0xdc0 fs/read_write.c:1295
__do_sys_sendfile64 fs/read_write.c:1362 [inline]
__se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1348
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f9234102a39
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 91 1b 00 00 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f92340b7218 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f9234183708 RCX: 00007f9234102a39
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007f9234183700 R08: 0000000000000000 R09: 0000000000000000
R10: 000080001d00c0d0 R11: 0000000000000246 R12: 00007f923414f6e0
R13: 00007f923414f180 R14: 0031656c69662f2e R15: 8088e3ad122bc192

</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---

RIP: 0010:ext4_write_inline_data fs/ext4/inline.c:235 [inline]

RIP: 0010:ext4_write_inline_data_end+0xea1/0x1020 fs/ext4/inline.c:773
Code: 31 ff e8 92 d9 44 ff 48 89 d8 48 25 ff 0f 00 00 74 70 e8 a2 d4 44 ff e9 12 f8 ff ff e8 98 d4 44 ff 90 0f 0b e8 90 d4 44 ff 90 <0f> 0b 48 8b 5c 24 18 48 89 df be 08 00 00 00 e8 bb a4 a3 ff 48 c1
RSP: 0018:ffffc90004957300 EFLAGS: 00010293
RAX: ffffffff824e91a0 RBX: 0000000000000042 RCX: ffff888029e48000
RDX: 0000000000000000 RSI: 0000000000000042 RDI: 0000000000000043
RBP: ffffc90004957428 R08: ffffffff824e86f9 R09: 1ffff11005ffe070
R10: dffffc0000000000 R11: ffffed1005ffe071 R12: ffff888067134e6a
R13: 0000000000000042 R14: 0000000000000043 R15: 0000000000000001
FS: 00007f92340b76c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000

CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033

CR2: 00007f92340b8000 CR3: 000000007218c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.