Hello, I reproduced this bug and comfired in the latest upstream.
#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
static unsigned long long procid;
static __thread int clone_ongoing;
static __thread int skip_segv;
static __thread jmp_buf segv_env;
static void segv_handler(int sig, siginfo_t* info, void* ctx) {
if (__atomic_load_n(&clone_ongoing, __ATOMIC_RELAXED) != 0) {
exit(sig);
}
uintptr_t addr = (uintptr_t)info->si_addr;
const uintptr_t prog_start = 1 << 20;
const uintptr_t prog_end = 100 << 20;
int skip = __atomic_load_n(&skip_segv, __ATOMIC_RELAXED) != 0;
int valid = addr < prog_start || addr > prog_end;
if (skip && valid) {
_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(...) \
({ \
int ok = 1; \
__atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \
if (_setjmp(segv_env) == 0) { \
__VA_ARGS__; \
} else \
ok = 0; \
__atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \
ok; \
})
static void sleep_ms(uint64_t ms) {
usleep(ms * 1000);
}
static uint64_t current_time_ms(void) {
struct timespec ts;
if (clock_gettime(CLOCK_MONOTONIC, &ts))
exit(1);
return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000;
}
static bool write_file(const char* file, const char* what, ...) {
char buf[1024];
va_list args;
va_start(args, what);
vsnprintf(buf, sizeof(buf), what, args);
va_end(args);
buf[sizeof(buf) - 1] = 0;
int len = strlen(buf);
int fd = open(file, O_WRONLY | O_CLOEXEC);
if (fd == -1)
return false;
if (write(fd, buf, len) != len) {
int err = errno;
close(fd);
errno = err;
return false;
}
close(fd);
return true;
}
//% 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.
//% 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;
}
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");
}
static void execute_one(void);
#define WAIT_FLAGS __WALL
static void loop(void) {
int iter = 0;
for (;; iter++) {
reset_loop();
int pid = fork();
if (pid < 0)
exit(1);
if (pid == 0) {
setup_test();
execute_one();
exit(0);
}
int status = 0;
uint64_t start = current_time_ms();
for (;;) {
if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid)
break;
sleep_ms(1);
if (current_time_ms() - start < 5000)
continue;
kill_and_wait(pid, &status);
break;
}
}
}
void execute_one(void) {
NONFAILING(memcpy((void*)0x20000040, "vfat\000", 5));
NONFAILING(memcpy((void*)0x20000200, "./file0\000", 8));
NONFAILING(syz_mount_image(/*fs=*/0x20000040, /*dir=*/0x20000200,
/*flags=*/0x220e002, /*opts=*/0, /*chdir=*/1,
/*size=*/0, /*img=*/0x20000100));
NONFAILING(memcpy((void*)0x20000040, "mtd", 3));
NONFAILING(sprintf((char*)0x20000043, "0x%016llx", (long long)0));
NONFAILING(memcpy((void*)0x200000c0, "./file0\000", 8));
NONFAILING(memcpy((void*)0x20001200, "jffs2\000", 6));
syscall(__NR_mount, /*src=*/0x20000040ul, /*dst=*/0x200000c0ul,
/*type=*/0x20001200ul, /*flags=*/0ul, /*data=*/0ul);
NONFAILING(memcpy((void*)0x200001c0, "./file0\000", 8));
NONFAILING(memcpy((void*)0x200002c0, "security.evm\000", 13));
NONFAILING(*(uint8_t*)0x20002040 = 3);
NONFAILING(*(uint8_t*)0x20002041 = 2);
NONFAILING(*(uint8_t*)0x20002042 = 0xb);
NONFAILING(*(uint32_t*)0x20002043 = htobe32(4));
NONFAILING(*(uint16_t*)0x20002047 = htobe16(0x1000));
NONFAILING(memcpy(
(void*)0x20002049,
"\x78\x8d\x9c\xb2\x99\xab\xd7\x2e\xce\x91\x3d\x53\x36\x5e\x16\x68\x8e\x51"
"\xac\xe1\x59\x84\xab\x53\xd1\x66\x6a\xe3\xf5\xdf\xbc\x86\x0b\xef\x87\x38"
"\x9e\x21\x28\x6b\xe2\x36\xdd\xc3\xd0\xfa\x2e\x51\xd5\xc5\xc7\xb3\x5c\x5d"
"\x50\x3c\x5b\x2c\x3b\x6b\xe0\xfc\x56\xe9\x7d\xf8\x8f\xaa\x06\x35\x36\x3b"
"\xa9\x2b\x82\xc4\x7a\x81\x7a\xc9\x7f\x1d\x63\x8a\x14\x61\x82\x12\x55\xec"
"\x23\xbd\x0c\xe5\xbf\x10\x94\xe3\xa8\x98\x0d\x7e\x6d\x19\x76\xba\x77\x87"
"\x45\x92\x0e\x17\x18\xfd\xda\xc4\xbd\x66\xb0\xa6\x06\x80\x1a\xae\xfd\xed"
"\x29\x3c\x3f\xce\xba\xd3\xb2\xc0\x64\x03\xdb\xa9\x99\x49\x71\x65\x9b\x7f"
"\x4a\x07\x7a\xdd\xae\xb8\xae\x3e\x5a\xca\x70\x27\xfd\xe1\xe4\x00\x01\xc0"
"\xbd\xd8\x00\xbc\xc2\x87\xe0\x2c\x86\x7e\x27\x82\xde\xaf\x67\x6a\x26\x16"
"\x47\xdb\x8c\x2f\x39\x45\x02\x20\x57\xde\x76\x81\x00\xa8\xbf\x73\xd9\xf9"
"\xff\x29\x22\x9b\x46\xde\xad\x58\xb2\xdd\xf9\x64\x33\x46\x8e\x9e\xee\x89"
"\x50\xdf\x65\x87\x11\xe4\x11\x36\x4e\x44\x14\x5e\x68\x2f\x3c\x05\x3c\x6f"
"\x5a\x18\x61\xee\xe6\xed\xf8\x85\xa9\x7c\x54\x58\x05\xac\x0c\x35\xa5\xe4"
"\x62\x3b\x20\x01\x86\x1c\x59\x33\x54\xb5\x70\xff\x3b\x4a\x45\xf1\xac\xde"
"\x0a\x8d\xbd\x17\xc0\x9c\xe4\x48\xed\x5d\xfd\x9e\x74\x72\xe6\x89\x67\xde"
"\xcb\x76\x9f\xa6\x00\xcd\x30\xbe\xb6\xc8\x03\x0e\x94\x74\xc7\xec\x4c\x1d"
"\xaf\x3e\x00\x7b\xbc\x57\x65\xb3\x66\xd4\xa1\x76\xe3\x8b\xdf\xab\xed\xd2"
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"\x79\xfb\x4d\x31\xe0\x88\xf0\x56\x9c\x67\xbb\xa4\x18\x68\xfe\x46\x4e\xd7"
"\x7e\xc7\xfe\x07\xdd\x3a\x5c\x2c\x81\xc1\xfd\xed\x16\x05\x98\xb3\x75\x64"
"\x51\x31\x73\xf1\x3f\xee\xb9\xdf\x4b\x47\xed\xe8\x05\x0a\xac\x43\x1e\x1b"
"\x20\x58\xc6\xaf\xe7\xe4\x4b\xcc\x6f\x28\xdc\x58\x33\xdd\xed\x10\xe6\x91"
"\x7e\x15\xb9\x30\x88\xcd\x90\x79\x18\x26\xca\x7c\x3b\x9a\x42\x11\xe9\xe2"
"\xff\xd4\x96\x62\x23\x81\x6d\xb6\xe4\xed\xe5\x70\x1b\x76\x98\x8d\x8f\x34"
"\xaa\x14\x0f\xfb\x4b\xc3\xef\xfc\xcb\xe5\xaf\x39\x42\xd4\xc5\x71\x77\x00"
"\xe5\x92\xa1\x70\x01\xd2\x0b\x66\x5f\xb7\xc6\xf6\x53\x61\x10\x8a\x13\x70"
"\xa4\x5d\xb4\x77\xa1\xf4\x49\xe5\xc3\xf9\xa8\x9f\x96\x72\x90\xaf\x23\x1d"
"\xb8\x2f\xed\xec\xfc\xa2\xc3\xce\xdf\xfe\xad\xb7\x75\x72\x8b\x45\xce\x4b"
"\xde\x06\x30\xe9\xe1\xdf\xcd\x98\x13\x8a\x55\x6d\xd4\x0b\x65\x55\x81\xb4"
"\x51\xa7\x16\x4a\xd5\x7c\x4f\xb2\xb5\xdc\x5b\x14\x5e\x87\x33\xde\x33\xaf"
"\x84\x4e\x40\x04\x14\xf8\x5c\x28\xca\x1f\x88\x8e\x70\xc4\x5d\x28\xc8\x23"
"\xe0\x7e\xdd\xf3\x0d\xf7\x91\x1d\xf5\x84\xad\x45\x8a\x25\x35\x50\x84\x16"
"\x3a\x9a\x7c\xc3\xba\xc4\x27\x6e\x95\x72\x11\x62\x6e\x28\x82\x12\x00\x53"
"\x34\xde\xc7\x42\xcf\xe5\x7e\x6c\x82\x34\xe5\x20\xd8\xbe\xd4\x5a\xf4\x76"
"\x77\x0f\x47\x18\xf7\x99\xc1\xa1\xf6\x37\xfc\x04\xa7\x37\x80\xa3\x5d\x21"
"\x94\xe6\x01\x7e\x40\x5d\x3e\x0b\x1e\x9f\x2c\x7c\x0f\x6a\x0e\xd2\x8a\x2e"
"\xaf\xdd\x79\x22\x76\x20\x59\xfe\x0e\xbc\x77\x59\x92\x45\xb1\x2c\x9f\x0c"
"\xef\x9e\xda\xb1\xa2\x51\x71\xa6\xa9\xa0\x56\x2e\x24\xdb\x76\xe2\x5d\xfb"
"\x5e\xcb\x73\x52\xd0\xbf\xc7\x8d\x85\x8e\x8a\xaa\xc9\x13\xef\xa4\xff\x60"
"\x48\x96\x79\xe8\xc7\x20\x19\x89\x7a\x8a\x85\xa9\xee\x29\xf1\x09\x22\x31"
"\x5b\xa7\xdb\x0a\x12\x6f\x82\x7c\x03\xfa\x5b\xbb\x90\xf9\x91\xcb\x98\x66"
"\xb3\xe0\x30\x47\xcb\x1f\xab\xbb\xdb\xe5\xa3\x52\x82\xf0\x30\xc0\xdb\xdb"
"\xd2\x27\xf8\x5b\x05\x72\x1c\x45\xc8\xb2\xb8\x5d\x33\x10\xbb\x41\xd6\xaa"
"\x56\x14\xa6\x0d\x98\x74\xd1\x2f\x11\xf5\xa9\x4b\x15\xf7\x41\xdb\x31\x0c"
"\x92\x7b\x2e\x90\x60\x7a\x2a\xf8\xc4\xb5\x7d\x6b\x69\x37\xd5\xa1\xeb\x14"
"\x58\x9d\x1e\x36\x16\x42\x45\x8c\xc2\xfb\xd2\x96\xac\x03\x1d\x09\x9d\xf4"
"\x9a\x53\xe8\xf0\xd4\x50\x6b\x2d\xcb\xb2\x0f\x54\x56\x0b\x69\x5a\x4e\x0a"
"\x4a\x5a\x13\x23\x19\x85\xd5\x3b\xb3\x53\x31\x26\xad\xd2\x81\xfd\x38\xcd"
"\xdf\x7e\xf4\x37\x20\x1e\x8a\xea\x1a\xb6\x3a\xd6\x73\xcd\xcc\x6c\x60\x41"
"\x14\xae\xc7\x71\x88\x1b\x4f\xb7\xaa\x7c\xcb\xd3\x97\xe7\x03\xf1\x08\x95"
"\x61\x9e\x15\xc7\x16\x84\xbb\xbf\xa2\xb2\xc6\x0a\x79\x0d\xe0\xe5\x05\x95"
"\x38\xb5\x1d\x34\x7a\x68\xad\x05\x74\x72\xa9\xf1\xea\xf0\x54\xdf\x77\x91"
"\xb5\x8f\x63\x8c\x05\x95\x55\xbb\xb9\x70\xed\xf8\x77\xd5\xf6\x23\xe2\x54"
"\x1d\xba\x27\xdf\x8d\x71\x3f\xe7\xc5\x5f\x40\xfb\xf3\xdb\xdc\x3d\x04\x2e"
"\x92\xb8\x3f\x94\xdd\x66\xd1\xcd\x2b\xc5\xcc\x98\xa6\xa5\x02\xb5\xd8\xd8"
"\xee\x6e\xfe\xca\xcf\xb7\x62\x46\x4c\x6f\x8c\xea\x8b\xda\xd1\x4a\x29\x19"
"\x99\x28\xe0\xcb\x07\xfb\xc3\x06\xb9\xee\xcc\xc4\xc7\xa3\x26\x18\x52\x54"
"\x41\x48\x92\xb6\x14\xdd\xcc\x20\xe9\xb5\xd2\x58\xe6\x62\x71\x43\x0c\x07"
"\x05\xc5\xa6\x22\xfa\x56\x46\xda\x48\x97\xa0\x88\xf6\x8f\xde\xb6\x68\x42"
"\xad\x3d\x72\xf2\x32\xf4\x87\xb3\xdb\x3b\x83\xd8\x26\x22\xc9\x1d\xaf\x77"
"\x96\x34\xfa\x1b\x97\xc7\xd5\xad\xb5\xd5\x3b\xe5\x19\x8b\xc5\x9a\xef\x1a"
"\xab\x60\xc3\x79\x52\x96\xa8\x4a\xc3\xf7\x73\x99\xfe\xed\x5b\x86\xf4\x4b"
"\x3a\x1c\xa3\x5e\xe4\x68\x91\xee\x90\x3a\x90\x34\x08\x83\xce\xc4\x1d\x57"
"\x7a\x88\x80\x94\x5b\x50\x4c\x7e\xa5\xbd\xc9\x4d\x66\xbf\x25\xb4\xd2\xe0"
"\x64\xbd\x69\xdf\xce\x4f\x00\xf8\xdf\xad\xe0\x73\x9f\xab\x52\x75\xdb\x11"
"\xe9\x99\xb2\x56\x22\xc2\x0c\xa0\xa9\xf1\x0f\x27\xc8\x00\xa4\xf5\xd1\x9a"
"\xa9\x2d\x04\xcd\x28\x2f\x96\xe9\x90\x30\x18\x74\xc5\xdd\xcf\xb1\x32\x23"
"\xc4\xf5\xfd\x37\xc4\x49\xad\xde\x53\x2a\x16\xae\xe6\x64\x07\xbf\xee\xee"
"\xbd\xa4\xf5\x13\xf2\x24\xe4\x34\xa9\xc0\x8a\x22\x81\xd5\xe1\xf4\x59\x1c"
"\x9a\x43\x3a\xb1\x57\x6c\x11\xed\xd0\xdf\x9f\xb6\xf4\x7b\x76\x1f\xc8\x78"
"\xd5\x32\xd7\xfc\x2a\x76\x24\x61\xfd\x14\x73\xeb\x7c\x7c\x88\x66\x8b\x74"
"\x9b\x9b\xbf\x43\xc9\x37\xfa\x2b\xd7\x3a\xe9\x17\xea\x2a\x90\x3b\xf5\xf7"
"\xd7\x1a\xe1\xc7\xd7\x1c\x60\xde\xf1\xbb\xc4\xe8\x15\x1b\xee\x5f\x4a\x39"
"\x63\x25\x90\x7f\x4f\x2b\xcb\xe9\x80\x38\xe4\x6b\xc9\xfb\x30\xd1\x99\xf0"
"\x25\xea\xbe\xb0\x37\xce\xae\xc3\xee\x18\x7f\x73\xa1\x36\xb8\x56\x6a\x94"
"\x3d\x5b\x32\x71\x19\x9e\x6d\x19\xb7\x06\x6d\x90\xb1\x0d\x0c\x11\xe7\xcb"
"\x0c\x0b\x5f\x73\x12\x7c\xd6\x85\xa7\x63\x8b\x99\xa1\xc9\xae\xa4\xfb\xf3"
"\xfa\xc6\x7a\x4b\x11\x4c\xa9\xfa\x60\xd2\xc9\xc2\x47\x23\xb0\x37\x14\x2e"
"\x3e\x47\x50\x3f\x3d\xfd\xff\xc4\x87\x21\x20\x90\xd2\x21\xeb\x85\xf5\x3c"
"\xf6\x17\x6c\x26\xb9\x3c\x75\x7b\x52\x1d\x01\x7c\xa1\x7a\xc7\x88\x9c\x26"
"\xc6\x47\x3f\xb4\x4c\xc2\xab\x79\xcd\x76\xfb\xf8\xfc\x5a\x81\xdc\x24\xbd"
"\x7b\xa6\xd5\x5d\x80\x36\xf4\xd6\x02\x18\xe7\xc8\xfd\xf7\xf3\xb9\x15\xef"
"\xd0\xbd\x0e\xdf\xac\x38\x0e\x37\x17\x79\x4a\xb4\x6b\x2a\x5d\xae\xd5\x8f"
"\xdb\x3e\xa6\x67\x20\xc0\xe7\x8a\x0c\xe8\x25\xb1\x55\xeb\xc0\x97\x9c\xf7"
"\x79\x15\xdb\x3d\xf6\x00\xbb\xd1\x79\xf1\xd2\xd6\x74\xd7\x6b\x12\xaf\xf0"
"\x87\x75\x7d\x4a\xa4\x80\xee\x15\x66\x78\x40\x74\xa5\x28\x7b\xe0\x08\x8e"
"\xfb\xe1\x2f\x55\x0b\xad\x3b\x41\x0c\xf0\x4f\xba\x8f\x06\xd1\x12\x0a\x1d"
"\xad\x35\xde\x9c\x7a\x22\xc3\xca\xf8\x3c\x1b\xf6\xea\x57\xa0\x55\xaf\xcb"
"\xc6\x1b\x06\x8f\xeb\x5d\x17\xf5\xd0\xcd\x9e\x59\x11\xd2\xd9\xc8\xc6\xff"
"\x89\xfc\x37\x72\x5a\x4b\x9a\xc3\xa8\x80\x0d\x17\x31\x19\x9c\x82\x01\xc0"
"\x52\x2e\x9a\xf7\x49\xfe\x36\xe1\x41\x94\x31\x0a\x5a\xaf\xd9\x44\xc3\x21"
"\xef\xb4\xec\xf5\xc1\x31\xcc\xf9\xde\x48\xc8\xb3\x6a\x90\x5f\x47\xeb\xa8"
"\xfb\x42\xce\x43\x5d\x1b\xd4\x08\xdc\x87\xb1\xc9\x15\x77\xff\xba\x16\xe3"
"\x2b\x9b\xe2\x19\x82\xd3\x17\x63\x20\xc8\xe2\x37\x99\xb6\xc5\xcc\x3d\x83"
"\x4c\xcb\xe9\xac\xed\xa7\x0b\xd2\xc7\x3a\x15\x41\x37\xac\xdd\x65\xf4\x19"
"\x1e\x44\x70\x89\x3e\xb2\x4e\x4a\xb0\x07\x00\xc2\xc1\x35\x14\x9f\xb8\x66"
"\x44\xb5\xac\x0b\xe1\x66\x92\x88\xb9\xc2\x9a\x1f\x6f\x61\x51\x7d\x8b\x4f"
"\x09\x61\x6e\x76\x7b\xd7\x2d\x13\xf8\x33",
4096));
syscall(__NR_lsetxattr, /*path=*/0x200001c0ul, /*name=*/0x200002c0ul,
/*val=*/0x20002040ul, /*size=*/0x1009ul, /*flags=*/3ul);
}
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);
install_segv_handler();
for (procid = 0; procid < 4; procid++) {
if (fork() == 0) {
loop();
}
}
sleep(1000000);
return 0;
}
I hope it helps.