WARNING in __brelse

From: Marius Fleischer
Date: Tue Jun 11 2024 - 14:56:06 EST

Hi,

We would like to report the following bug which has been found by our
modified version of syzkaller.

======================================================
description: WARNING in __brelse
affected file: fs/buffer.c
kernel version: 5.15.159
kernel commit: 83655231580bc07485a4ac2a6c971c3a175dd27d
git tree: upstream
kernel config: attached
crash reproducer: attached
======================================================
Crash log:
VFS: brelse: Trying to free free buffer
WARNING: CPU: 1 PID: 51571 at fs/buffer.c:1148 __brelse
fs/buffer.c:1148 [inline]
WARNING: CPU: 1 PID: 51571 at fs/buffer.c:1148 __brelse+0x67/0xa0
fs/buffer.c:1142
Modules linked in:
CPU: 1 PID: 51571 Comm: syz-executor.6 Not tainted 5.15.159 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:__brelse fs/buffer.c:1148 [inline]
RIP: 0010:__brelse+0x67/0xa0 fs/buffer.c:1142
Code: 7c 04 84 d2 75 4e 44 8b 63 60 31 ff 44 89 e6 e8 4f ec 9b ff 45
85 e4 75 1c e8 d5 f3 9b ff 48 c7 c7 a0 68 9a 89 e8 ef d9 13 07 <0f> 0b
5b 5d 41 5c e9 be f3 9b ff e8 b9 f3 9b ff be 04 00 00 00 48
RSP: 0018:ffffc90015137990 EFLAGS: 00010282
RAX: 0000000000000000 RBX: ffff8880ae4753a0 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff815f20ca RDI: fffff52002a26f24
RBP: ffff8880ae475400 R08: 0000000000000001 R09: ffff88823bc27a5b
R10: 0000000000000000 R11: 000000003a534656 R12: 0000000000000000
R13: ffff8880ae4753a0 R14: ffff88807d7df028 R15: ffff8881564907c0
FS: 00007f67652c2640(0000) GS:ffff88823bc00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2dc67f4e00 CR3: 000000001b532000 CR4: 0000000000750ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
<TASK>
brelse include/linux/buffer_head.h:325 [inline]
udf_rename+0x919/0x1260 fs/udf/namei.c:1214
vfs_rename+0xe36/0x16d0 fs/namei.c:4832
do_renameat2+0xb0c/0xd20 fs/namei.c:4985
__do_sys_renameat2 fs/namei.c:5018 [inline]
__se_sys_renameat2 fs/namei.c:5015 [inline]
__x64_sys_renameat2+0xe7/0x120 fs/namei.c:5015
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f6766d52dad
Code: c3 e8 97 2b 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f67652c2028 EFLAGS: 00000246 ORIG_RAX: 000000000000013c
RAX: ffffffffffffffda RBX: 00007f6766e8ff80 RCX: 00007f6766d52dad
RDX: ffffffffffffff9c RSI: 0000000020000440 RDI: ffffffffffffff9c
RBP: 00007f67652c20a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020000480 R11: 0000000000000246 R12: 0000000000000002
R13: 000000000000000b R14: 00007f6766e8ff80 R15: 00007f67652a2000
</TASK>
======================================================

Please let us know if we should provide additional information.

Wishing you a nice day!

Best,
Marius

Attachment: config-5.15.159
Description: Binary data

Attachment: repro.syz
Description: Binary data

// 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 <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/loop.h>

#ifndef __NR_memfd_create
#define __NR_memfd_create 319
#endif
#ifndef __NR_renameat2
#define __NR_renameat2 316
#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 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 madler@xxxxxxxxxxxxxxxxxx

//% 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 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 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")) {
}
}

static void setup_fault()
{
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)
exit(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);
}
}

void execute_one(void)
{
memcpy((void*)0x20000c00, "udf\000", 4);
memcpy((void*)0x20000c40, "./file0\000", 8);
memcpy((void*)0x20000000, "unhide", 6);
*(uint8_t*)0x20000006 = 0x2c;
memcpy((void*)0x20000007, "umask", 5);
*(uint8_t*)0x2000000c = 0x3d;
sprintf((char*)0x2000000d, "%023llo", (long long)4);
*(uint8_t*)0x20000024 = 0x2c;
memcpy((void*)0x20000025, "iocharset", 9);
*(uint8_t*)0x2000002e = 0x3d;
memcpy((void*)0x2000002f, "iso8859-1", 9);
*(uint8_t*)0x20000038 = 0x2c;
memcpy((void*)0x20000039, "longad", 6);
*(uint8_t*)0x2000003f = 0x2c;
*(uint8_t*)0x20000040 = 0;
memcpy(
(void*)0x20000cc0,
"\x78\x9c\xec\xdd\x41\x6c\x1c\xd7\x79\x07\xf0\xef\x0d\x49\x91\x92\x8b\x64"
"\xeb\x58\xb2\x93\x1a\xc1\xda\x05\x1c\x55\x69\x54\x92\x8a\x2d\x1b\x0c\x50"
"\xab\x66\x89\xa6\x51\x6c\xd6\x14\x93\xb6\xee\xc1\x2b\x71\xa5\x6e\x45\x2d"
"\x17\x24\xe5\xc8\x46\x9b\xb8\x27\x1f\x5a\xa0\x6c\x0a\xf4\xd2\x14\x28\x50"
"\xa4\x30\x7a\x08\xd8\x43\x0e\xed\x29\x05\x0a\xf4\x4a\x14\xb9\x15\x05\xd4"
"\x34\x75\x5d\x14\x05\xf6\x10\x23\x97\xc2\x2c\x66\xf6\x2d\xb9\x92\x68\x8b"
"\x30\x45\x51\x92\x7f\x3f\x40\xfa\x0f\x67\xbf\xb7\x3b\xf3\xde\x7a\x66\xb8"
"\x6f\xc7\x0a\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x20\xe2"
"\x57\x7e\xf5\xcc\xf8\x44\x3a\xe8\xad\x00\x00\xee\xa6\x17\xe7\x5e\x1e\x9f"
"\x74\xfe\x07\x80\x8f\x95\x73\x7e\xff\x07\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x80\x7b\x5d\x8a\x22\xde\x8d\x14\xdf\x78\xbc\x9b\x5e\xad\x7e\xee"
"\x19\x3b\xdb\x6a\x5f\xbd\x36\x3f\x3d\xb3\x73\xb3\xc3\xa9\x6a\x39\x54\xd5"
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"\x7d\x3a\x5e\x9a\x3b\x77\xa6\xfe\xc2\xd2\x95\xce\x72\x73\x65\xa5\xb9\x50"
"\x9f\x6f\xb7\x2e\x2c\x2d\x34\x77\xfd\x0c\x7b\x6d\x7f\xb3\x13\x55\x07\xd4"
"\xaf\x5c\xbe\xba\x70\xf1\xe2\x4a\x7d\xf2\xe4\xa9\x1b\x1e\xbe\x56\x7b\x67"
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"\xcb\x0d\x3e\x51\xee\xde\x5c\xa7\xb1\xdc\x38\xbf\xd8\xac\xcf\x36\x96\x57"
"\x5b\xab\xad\xa5\xf6\x6c\xea\x6d\x6d\xaa\xca\x8b\x78\x36\x45\x74\x22\xa2"
"\x3b\x7a\xeb\xd3\x8d\x44\x11\xdf\x8c\x14\x6f\x7d\xa7\x9b\xce\x47\xc4\x50"
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"\xe7\x9c\xcd\xd9\xc9\xb9\x96\x73\x3d\xe7\x46\xce\x6e\xce\xda\x70\x6e\x9f"
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"\xf3\x3c\x65\xed\xc9\x88\x58\x2f\x76\x77\x4f\xee\xa1\x7c\xeb\xf0\x6c\x9a"
"\x4d\xe9\x80\xee\x21\xa6\x77\xff\xdf\x1f\xe4\xfb\xff\xfe\xf0\xa0\x37\x06"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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"\xdd\x14\x29\x22\xea\x11\xaf\x46\x2f\xaf\x8f\x1e\xf4\xd6\x01\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
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"\xbc\x35\x0d\x5d\x7d\x6f\xe0\x13\xd5\xf7\x06\x7a\xcb\x9f\x9c\x3a\xfd\x1b"
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"\x58\x3d\x3c\x72\x6b\xe9\x58\x7e\xdd\xf1\xbd\xed\x32\x03\xca\xf1\x5f\x8d"
"\x14\x7f\xfc\x97\xf5\xf4\x44\x5e\x77\xe3\xf8\x0f\x6d\xd5\x7e\xf7\xf7\xb7"
"\xc7\xfb\xcd\x9b\x9f\xe8\x03\xc6\x7c\xaf\xe3\xff\xb3\x03\xeb\xca\xd7\x4c"
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"\xee\x86\xf2\xfc\xff\xf5\x48\xf1\x0f\x7f\xf6\xaf\x5b\xd7\x3b\xf9\xfc\xff"
"\x33\xbd\x9f\xb6\xaf\xff\x7e\xfa\xcd\xed\xf3\xff\xd4\xcd\x4f\xb4\x4f\xe7"
"\xff\x4f\x0d\xac\x9b\xca\x57\x23\x23\xc3\x11\x63\xab\x57\x3a\x23\x8f\x46"
"\x8c\xad\xbc\xfe\xc6\x17\x5a\x57\x1a\x97\x9a\x97\x9a\xed\x53\xa7\x9f\x7b"
"\x66\x72\xfc\xb9\x89\xf1\x53\x23\x87\xfa\x17\x77\xdb\x4b\x7b\xee\xab\x07"
"\x51\x39\xfe\xbf\x17\x29\xbe\xf7\xa3\xbf\x8d\xcf\xe5\x75\x37\x5e\xff\xed"
"\x7c\xfd\x7f\xe4\xe6\x27\xda\xa7\xf1\x7f\x64\x60\xdd\x91\x1b\xae\x57\xf6"
"\xbc\xeb\xe4\xf1\xff\xbf\x48\xf1\xcf\xd3\x3f\x88\xe3\x79\xdd\x87\x5d\xff"
"\xf7\x7f\xff\x3f\x9e\x2f\xc2\xb7\xae\xcf\xf7\x69\xfc\x8f\x0e\xac\xab\x7e"
"\xc7\xfb\x44\xc4\x2f\x0c\xac\x3b\x7e\x34\xe2\x81\xfb\xa5\x0c\x00\x00\x00"
"\xee\xb0\x94\x8a\xf8\x41\x9e\x4f\x1d\xbf\xcd\x7c\xea\x3f\x45\x8a\x37\xfe"
"\xfb\x17\x73\x5d\x3a\x56\xd6\x3d\x9f\x1f\xaf\x55\x7f\x8f\xbd\xb8\xd4\xfe"
"\xc2\x99\xc5\xc5\xa5\x0b\x8d\xd5\xc6\xf9\xc5\x66\x7d\xae\xd3\xb8\xd0\x2c"
"\xdb\xfe\x38\x52\x74\xff\xfa\xf1\xdc\xb6\xa8\xe6\x57\xfb\xf3\xcd\xbd\x39"
"\xde\xed\xb9\xd8\x7f\x89\x14\xcf\xfd\x5a\xbf\xb6\x37\x17\xdb\xff\x6c\xea"
"\x91\xed\xda\x89\xb2\xf6\x64\xa4\xf8\x93\x17\x6f\xac\xed\x7f\x8e\x71\x74"
"\xbb\x76\xb2\xac\xfd\xb7\x48\x31\xf1\xca\xce\xb5\xc7\xb6\x6b\x4f\x95\xb5"
"\xff\x15\x29\x7e\xfa\x17\xf5\x7e\xed\x91\xb2\xf6\x4b\xb9\xf6\xd1\xed\xda"
"\x93\x17\x96\x16\x17\xf6\x61\x58\x00\x00\x00\x00\x00\x60\x4f\x46\x52\x11"
"\xcf\x44\x8a\xbf\x3f\x35\x9c\xfa\x9f\x6f\xef\xe6\xfb\x9f\xb7\x7c\xe8\xbd"
"\x4f\xdf\xff\x7b\x74\x60\xdd\xc2\x5d\xba\x5f\x65\xcf\x9d\x0a\x00\xf7\xb8"
"\xf2\xfc\x7f\xbc\x3c\xab\xff\xf2\x5f\x6d\xcd\xe5\xdf\x78\xfe\xdf\xfe\xff"
"\x00\x0c\x9e\xff\x6f\x36\xf8\xef\x06\x7c\xd0\xf2\x47\x39\xff\xd7\xee\xcc"
"\x6e\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
"\x00\x00\x7c\xec\xa4\x28\x62\x29\x52\x7c\xe3\xf1\x6e\xba\x3e\x5a\xfe\xdc"
"\x33\x76\xb6\xd5\xbe\x7a\x6d\x7e\x7a\x66\xe7\x66\x87\x53\xd5\x72\xa8\xaa"
"\x2f\xff\x8c\x4d\x4c\x9e\xfa\xe2\xd3\xcf\x9c\x7e\xb6\x9f\x1f\xde\xfe\x4e"
"\xfb\x74\xbc\x34\x77\xee\x4c\xfd\x85\xa5\x2b\x9d\xe5\xe6\xca\x4a\x73\xa1"
"\x3e\xdf\x6e\x5d\x58\x5a\x68\xee\xfa\x19\xf6\xda\xfe\x66\x27\xaa\x0e\xa8"
"\x5f\xb9\x7c\x75\xe1\xe2\xc5\x95\xfa\xe4\xc9\x53\x37\x3c\x7c\xad\xf6\xce"
"\xe8\x43\xc7\x6a\x53\xa7\x27\x5e\x39\xda\xaf\x9d\x9f\x9e\x99\x99\x1b\xa8"
"\x19\x1e\xf9\xc8\xaf\x7e\x8b\xf4\x01\xeb\x0f\x45\x11\xff\x1b\x29\x2e\xbf"
"\xfd\x6e\xfa\xf7\xd1\x88\x22\xf6\xde\x17\xb7\x79\xef\xec\xb7\xc3\xd5\x4e"
"\x9c\xa8\x76\x62\x7e\x7a\xa6\xda\x91\xc5\x56\xa3\xbd\x5a\x3e\x38\xdb\xef"
"\x88\x22\xa2\x36\xd0\xe8\xf9\x7e\x1f\xdd\x85\xb1\xd8\x93\x7a\xc4\x9b\xe5"
"\xe6\x97\x1b\x7c\xa2\xdc\xbd\xb9\x4e\x63\xb9\x71\x7e\xb1\x59\x9f\x6d\x2c"
"\xaf\xb6\x56\x5b\x4b\xed\xd9\xd4\xdb\xda\x54\x95\x17\xf1\x6c\x8a\xe8\x44"
"\x44\x77\xf4\xd6\xa7\x1b\x89\x22\x46\x22\xc5\x5b\xdf\xe9\xa6\x1f\x8d\x46"
"\x0c\xf5\xfb\xe1\xf3\x2f\xce\xbd\x3c\x3e\x79\xfb\xed\x29\xf6\x61\x1f\x77"
"\x61\x38\x22\x6a\x23\x11\x1b\xc5\x7d\x30\x66\xf7\xb0\xd1\x28\xe2\xe9\x48"
"\xf1\xed\x6f\x8d\xc7\x7f\x8c\xf6\xfa\xb5\xea\xb6\xa7\x22\xbe\x5a\xe6\xb1"
"\x88\xab\x65\x5e\x8f\x58\x2b\xf3\xb3\x11\xa9\x7c\x83\x3c\x12\xf1\xde\x0e"
"\xef\x27\xee\x2f\xc3\x51\xc4\xc3\x91\xe2\x27\x53\xdd\xf4\xe3\xd1\x3c\xf6"
"\xd5\x71\xe5\xec\xd7\xea\x5f\x6e\x5f\x5c\x1a\xa8\xed\x1f\x57\xee\xfb\xf3"
"\xc3\xdd\x74\x8f\x1f\x9b\xc6\xa2\x88\x77\xab\x23\x7e\x37\xfd\xa7\xff\x9e"
"\x01\x00\x00\x00\x00\x1e\x20\x45\x3c\x16\x29\x9e\xf8\xe1\xf1\x54\xcd\x0f"
"\x6e\xcd\x29\xb6\xda\x97\xea\xe7\x1a\xe7\x17\x7b\x1f\xeb\xf7\x3f\xfb\xaf"
"\xe7\x56\x9b\x9b\x9b\x9b\xb5\xd4\xcb\xf1\x9c\xb3\x39\x3b\x39\xd7\x72\xae"
"\xe7\xdc\xc8\xd9\xcd\x59\x2b\x72\xfb\x9c\xb3\x39\x3b\x39\xd7\x72\xae\xe7"
"\xdc\xc8\xd9\xcd\x59\x1b\xca\xed\x73\xce\xe6\xec\xe4\x5c\xcb\xb9\x9e\x73"
"\x23\x67\x37\x67\x6d\x38\xb7\xcf\x39\x9b\xb3\x93\x73\x2d\xe7\x7a\xce\x8d"
"\x9c\xdd\xe1\x83\x1c\x2f\x00\x00\x00\x00\x00\x00\x80\x9d\x15\x51\xc4\xe7"
"\x22\xc5\x6b\xdf\xef\xa6\xcd\xd1\xde\x04\xef\xab\xd1\xcb\xeb\xee\x07\x7a"
"\xe0\xfd\x7f\x00\x00\x00\xff\xff\x56\xe5\x5b\x7a",
3054);
syz_mount_image(/*fs=*/0x20000c00, /*dir=*/0x20000c40, /*flags=*/0,
/*opts=*/0x20000000, /*chdir=*/1, /*size=*/0xbee,
/*img=*/0x20000cc0);
memcpy((void*)0x20000440, "./file0\000", 8);
memcpy((void*)0x20000480, "./file7\000", 8);
inject_fault(19);
syscall(__NR_renameat2, /*oldfd=*/0xffffff9c, /*old=*/0x20000440ul,
/*newfd=*/0xffffff9c, /*new=*/0x20000480ul, /*flags=*/0ul);
}
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);
setup_fault();
use_temporary_dir();
loop();
return 0;
}