Date: Thu, 10 Dec 2020 05:44:36 +0000 (UTC) From: Peter Holm <pho@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r368496 - user/pho/stress2/misc Message-ID: <202012100544.0BA5iaXg045816@repo.freebsd.org>
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Author: pho Date: Thu Dec 10 05:44:35 2020 New Revision: 368496 URL: https://svnweb.freebsd.org/changeset/base/368496 Log: Added more syzkaller reproducers. Added: user/pho/stress2/misc/syzkaller23.sh (contents, props changed) user/pho/stress2/misc/syzkaller24.sh (contents, props changed) user/pho/stress2/misc/syzkaller25.sh (contents, props changed) user/pho/stress2/misc/syzkaller28.sh (contents, props changed) Added: user/pho/stress2/misc/syzkaller23.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/syzkaller23.sh Thu Dec 10 05:44:35 2020 (r368496) @@ -0,0 +1,402 @@ +#!/bin/sh + +# panic: Bad link elm 0xfffff80b62eb7500 prev->next != elm +# cpuid = 2 +# time = 1598546886 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe010154a6e0 +# vpanic() at vpanic+0x182/frame 0xfffffe010154a730 +# panic() at panic+0x43/frame 0xfffffe010154a790 +# unp_disconnect() at unp_disconnect+0x279/frame 0xfffffe010154a7c0 +# uipc_disconnect() at uipc_disconnect+0xfd/frame 0xfffffe010154a800 +# soclose() at soclose+0xa2/frame 0xfffffe010154a870 +# _fdrop() at _fdrop+0x1a/frame 0xfffffe010154a890 +# closef() at closef+0x1ea/frame 0xfffffe010154a920 +# fdescfree_fds() at fdescfree_fds+0x8c/frame 0xfffffe010154a980 +# fdescfree() at fdescfree+0x3cd/frame 0xfffffe010154aa50 +# exit1() at exit1+0x487/frame 0xfffffe010154aac0 +# sys_sys_exit() at sys_sys_exit+0xd/frame 0xfffffe010154aad0 +# amd64_syscall() at amd64_syscall+0x159/frame 0xfffffe010154abf0 +# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe010154abf0 +# --- syscall (1, FreeBSD ELF64, sys_sys_exit), rip = 0x80045376a, rsp = 0x7fffffffe4c8, rbp = 0x7fffffffe4e0 --- + +# $FreeBSD$ + +[ `uname -p` != "amd64" ] && exit 0 + +# Obtained from markj (syzkaller). + +. ../default.cfg +cat > /tmp/syzkaller23.c <<EOF +// autogenerated by syzkaller (https://github.com/google/syzkaller) + +#define _GNU_SOURCE + +#include <sys/types.h> + +#include <dirent.h> +#include <errno.h> +#include <pthread.h> +#include <pwd.h> +#include <setjmp.h> +#include <signal.h> +#include <stdarg.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/endian.h> +#include <sys/stat.h> +#include <sys/syscall.h> +#include <sys/wait.h> +#include <time.h> +#include <unistd.h> + +static __thread int skip_segv; +static __thread jmp_buf segv_env; + +static void segv_handler(int sig, siginfo_t* info, void* ctx __unused) +{ + 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 (sig == SIGBUS) { + valid = 1; + } + 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_sigaction = segv_handler; + sa.sa_flags = SA_NODEFER | SA_SIGINFO; + sigaction(SIGSEGV, &sa, NULL); + sigaction(SIGBUS, &sa, NULL); +} + +#define NONFAILING(...) \ + { \ + __atomic_fetch_add(&skip_segv, 1, __ATOMIC_SEQ_CST); \ + if (_setjmp(segv_env) == 0) { \ + __VA_ARGS__; \ + } \ + __atomic_fetch_sub(&skip_segv, 1, __ATOMIC_SEQ_CST); \ + } + +static void kill_and_wait(int pid, int* status) +{ + kill(pid, SIGKILL); + while (waitpid(-1, status, 0) != pid) { + } +} + +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 remove_dir(const char* dir) +{ + DIR* dp = opendir(dir); + if (dp == NULL) + 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); + struct stat st; + if (lstat(filename, &st)) + exit(1); + if (S_ISDIR(st.st_mode)) { + remove_dir(filename); + continue; + } + if (unlink(filename)) + exit(1); + } + closedir(dp); + if (rmdir(dir)) + 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 { + pthread_mutex_t mu; + pthread_cond_t cv; + int state; +} event_t; + +static void event_init(event_t* ev) +{ + if (pthread_mutex_init(&ev->mu, 0)) + exit(1); + if (pthread_cond_init(&ev->cv, 0)) + exit(1); + ev->state = 0; +} + +static void event_reset(event_t* ev) +{ + ev->state = 0; +} + +static void event_set(event_t* ev) +{ + pthread_mutex_lock(&ev->mu); + if (ev->state) + exit(1); + ev->state = 1; + pthread_mutex_unlock(&ev->mu); + pthread_cond_broadcast(&ev->cv); +} + +static void event_wait(event_t* ev) +{ + pthread_mutex_lock(&ev->mu); + while (!ev->state) + pthread_cond_wait(&ev->cv, &ev->mu); + pthread_mutex_unlock(&ev->mu); +} + +static int event_isset(event_t* ev) +{ + pthread_mutex_lock(&ev->mu); + int res = ev->state; + pthread_mutex_unlock(&ev->mu); + return res; +} + +static int event_timedwait(event_t* ev, uint64_t timeout) +{ + uint64_t start = current_time_ms(); + uint64_t now = start; + pthread_mutex_lock(&ev->mu); + for (;;) { + if (ev->state) + break; + uint64_t remain = timeout - (now - start); + struct timespec ts; + ts.tv_sec = remain / 1000; + ts.tv_nsec = (remain % 1000) * 1000 * 1000; + pthread_cond_timedwait(&ev->cv, &ev->mu, &ts); + now = current_time_ms(); + if (now - start > timeout) + break; + } + int res = ev->state; + pthread_mutex_unlock(&ev->mu); + return res; +} + +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; + int collide = 0; +again: + for (call = 0; call < 5; 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 (collide && (call % 2) == 0) + break; + event_timedwait(&th->done, 45); + break; + } + } + for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) + sleep_ms(1); + if (!collide) { + collide = 1; + goto again; + } +} + +static void execute_one(void); + +#define WAIT_FLAGS 0 + +static void loop(void) +{ + int iter = 0; + for (;; iter++) { + char cwdbuf[32]; + sprintf(cwdbuf, "./%d", iter); + if (mkdir(cwdbuf, 0777)) + exit(1); + int pid = fork(); + if (pid < 0) + exit(1); + if (pid == 0) { + if (chdir(cwdbuf)) + exit(1); + 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 < 5 * 1000) + 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: + NONFAILING(memcpy((void*)0x20000000, ".\000", 2)); + res = syscall(SYS_open, 0x20000000ul, 0ul, 0ul); + if (res != -1) + r[0] = res; + break; + case 1: + res = syscall(SYS_socketpair, 1ul, 2ul, 0, 0x20000100ul); + if (res != -1) + NONFAILING(r[1] = *(uint32_t*)0x20000100); + break; + case 2: + NONFAILING(memcpy( + (void*)0x20000180, + "\x0a\x01\x2e\x2f\x66\x69\x6c\x65\x30\x00\x46\xd3\xc5\xea\xb2\xf9\xd0" + "\x81\x73\xef\x4a\xd0\xe9\x00\x9b\x10\xb2\x6d\x40\xab\xf3\x06\x35\x55" + "\x92\x6b\xa7\x48\x51\xed\xf1\x47\x2a\x1c\x57\xda\x98\x4d\x23\x4f\x6d" + "\x63\x57\x71\x99\x01\x97\x42\xef\xe9\xd6\x91\x78\x55\x43\x7f\x80\x8b" + "\xf3\xfa\x29\xeb\x62\xeb\x2f\x4b\xb5\xcd\x3f\xd7\x4f\x78\x35\xfb\xd3" + "\x24\xe3\xc4\x10\x31\x53\xdd\xe7\x9a\x1c\x23\x36\x48\xe4\x7a\xf8\x3a" + "\x7e\xd0\x1f\x89\xf7\xb6\xee\xff\x69\x1d\xad\x02\x57\x01\xf2\x52\x93" + "\x3e\x6b\xda\x65\x2a\xc7\x6c\x27\xf9\x0a\xd4\x3b\x05\x00\x00\x00\x1b" + "\x1c\x89\xc9\x3b\x41\x9c\x7b\x4f\x31\xbb\x6a\x5c\x17\xed\x78\xf1\x64" + "\xc4\xa3\x17\x5c\x7a\x8c\x02\x75\x00\xaf\x61\xac\x90\x22\x86\x15\x67" + "\x90\x03\x17\x8c\x55\xf6\xb9\x3a\xf8\x6c\xab\xcb\xf1\x74\x09\xc0\xbc" + "\xf4\x5b\x76\x33\x8f\x9a\x76\xf3\x6e", + 196)); + syscall(SYS_bindat, r[0], r[1], 0x20000180ul, 0xaul); + break; + case 3: + NONFAILING(*(uint8_t*)0x20000040 = 0xa); + NONFAILING(*(uint8_t*)0x20000041 = 1); + NONFAILING(memcpy((void*)0x20000042, "./file0\000", 8)); + syscall(SYS_connectat, r[0], r[1], 0x20000040ul, 0xaul); + break; + case 4: + NONFAILING(*(uint8_t*)0x20000000 = 0xa); + NONFAILING(*(uint8_t*)0x20000001 = 1); + NONFAILING(memcpy((void*)0x20000002, "./file0\000", 8)); + syscall(SYS_connect, r[1], 0x20000000ul, 0xaul); + break; + } +} +int main(void) +{ + syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); + install_segv_handler(); + use_temporary_dir(); + loop(); + return 0; +} +EOF +mycc -o /tmp/syzkaller23 -Wall -Wextra -O0 /tmp/syzkaller23.c -lpthread || + exit 1 + +for i in `jot 256`; do + (cd /tmp; timeout 3m ./syzkaller23) & +done +wait + +rm -rf /tmp/syzkaller23 syzkaller23.c /tmp/syzkaller.* +exit 0 Added: user/pho/stress2/misc/syzkaller24.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/syzkaller24.sh Thu Dec 10 05:44:35 2020 (r368496) @@ -0,0 +1,134 @@ +#!/bin/sh + +# panic: sleepq_add: td 0xfffffe00dffd8800 to sleep on wchan 0xffffffff81d9bee8 with sleeping prohibited +# cpuid = 7 +# time = 1599685416 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00e656d5e0 +# vpanic() at vpanic+0x182/frame 0xfffffe00e656d630 +# panic() at panic+0x43/frame 0xfffffe00e656d690 +# sleepq_add() at sleepq_add+0x359/frame 0xfffffe00e656d6e0 +# _sx_xlock_hard() at _sx_xlock_hard+0x405/frame 0xfffffe00e656d780 +# _sx_xlock() at _sx_xlock+0xba/frame 0xfffffe00e656d7c0 +# inp_setmoptions() at inp_setmoptions+0xd5c/frame 0xfffffe00e656d970 +# ip_ctloutput() at ip_ctloutput+0x103/frame 0xfffffe00e656d9c0 +# rip_ctloutput() at rip_ctloutput+0x158/frame 0xfffffe00e656d9f0 +# sosetopt() at sosetopt+0xed/frame 0xfffffe00e656da50 +# kern_setsockopt() at kern_setsockopt+0xa8/frame 0xfffffe00e656dab0 +# sys_setsockopt() at sys_setsockopt+0x24/frame 0xfffffe00e656dad0 +# amd64_syscall() at amd64_syscall+0x159/frame 0xfffffe00e656dbf0 +# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe00e656dbf0 +# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x80042819a, rsp = 0x7fffffffe958, rbp = 0x7fffffffe970 --- +# KDB: enter: panic +# [ thread pid 27447 tid 100183 ] +# Stopped at kdb_enter+0x37: movq $0,0x10b7246(%rip) +# db> x/s version +# version: FreeBSD 13.0-CURRENT #0 r365508: Wed Sep 9 21:36:20 CEST 2020 +# pho@mercat1.netperf.freebsd.org:/usr/src/sys/amd64/compile/PHO +# db> + +# $FreeBSD$ + +[ `uname -p` != "amd64" ] && exit 0 + + +. ../default.cfg +cat > /tmp/syzkaller24.c <<EOF +// https://syzkaller.appspot.com/bug?id=0f4996e03d94b16bb9e945ede3c9de343748e6ed +// autogenerated by syzkaller (https://github.com/google/syzkaller) +// Reported-by: syzbot+34f419947239a738ed34@syzkaller.appspotmail.com + +#define _GNU_SOURCE + +#include <sys/types.h> + +#include <pwd.h> +#include <signal.h> +#include <stdarg.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/endian.h> +#include <sys/syscall.h> +#include <sys/wait.h> +#include <time.h> +#include <unistd.h> + +static void kill_and_wait(int pid, int* status) +{ + kill(pid, SIGKILL); + while (waitpid(-1, status, 0) != pid) { + } +} + +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 execute_one(void); + +#define WAIT_FLAGS 0 + +static void loop(void) +{ + int iter = 0; + for (;; iter++) { + int pid = fork(); + if (pid < 0) + exit(1); + if (pid == 0) { + 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 < 5 * 1000) + continue; + kill_and_wait(pid, &status); + break; + } + } +} + +uint64_t r[1] = {0xffffffffffffffff}; + +void execute_one(void) +{ + intptr_t res = 0; + res = syscall(SYS_socket, 2ul, 3ul, 1); + if (res != -1) + r[0] = res; + *(uint32_t*)0x20000180 = htobe32(0xe0000002); + *(uint32_t*)0x20000184 = htobe32(0x7f000001); + *(uint32_t*)0x20000188 = htobe32(0x7f000001); + syscall(SYS_setsockopt, r[0], 0, 0x46, 0x20000180ul, 0x4414ae3732a778ful); +} +int main(void) +{ + syscall(SYS_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x1012ul, -1, 0ul); + loop(); + return 0; +} +EOF +mycc -o /tmp/syzkaller24 -Wall -Wextra -O0 /tmp/syzkaller24.c || + exit 1 + +(cd /tmp; timeout 3m ./syzkaller24) + +rm -rf /tmp/syzkaller24 syzkaller24.c /tmp/syzkaller.* +exit 0 Added: user/pho/stress2/misc/syzkaller25.sh ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ user/pho/stress2/misc/syzkaller25.sh Thu Dec 10 05:44:35 2020 (r368496) @@ -0,0 +1,478 @@ +#!/bin/sh + +# Fatal trap 9: general protection fault while in kernel mode +# cpuid = 5; apic id = 05 +# instruction pointer = 0x20:0xffffffff8237cbac +# stack pointer = 0x28:0xfffffe01026e4910 +# frame pointer = 0x28:0xfffffe01026e4980 +# code segment = base 0x0, limit 0xfffff, type 0x1b +# = DPL 0, pres 1, long 1, def32 0, gran 1 +# processor eflags = interrupt enabled, resume, IOPL = 0 +# current process = 45836 (syzkaller25) +# trap number = 9 +# panic: general protection fault +# cpuid = 5 +# time = 1601745366 +# KDB: stack backtrace: +# db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe01026e4620 +# vpanic() at vpanic+0x182/frame 0xfffffe01026e4670 +# panic() at panic+0x43/frame 0xfffffe01026e46d0 +# trap_fatal() at trap_fatal+0x387/frame 0xfffffe01026e4730 +# trap() at trap+0xa4/frame 0xfffffe01026e4840 +# calltrap() at calltrap+0x8/frame 0xfffffe01026e4840 +# --- trap 0x9, rip = 0xffffffff8237cbac, rsp = 0xfffffe01026e4910, rbp = 0xfffffe01026e4980 --- +# sctp_inpcb_bind() at sctp_inpcb_bind+0x3cc/frame 0xfffffe01026e4980 +# sctp_connect() at sctp_connect+0x14f/frame 0xfffffe01026e49e0 +# soconnectat() at soconnectat+0xd0/frame 0xfffffe01026e4a30 +# kern_connectat() at kern_connectat+0xe2/frame 0xfffffe01026e4a90 +# sys_connect() at sys_connect+0x75/frame 0xfffffe01026e4ad0 +# amd64_syscall() at amd64_syscall+0x14e/frame 0xfffffe01026e4bf0 +# fast_syscall_common() at fast_syscall_common+0xf8/frame 0xfffffe01026e4bf0 +# --- syscall (0, FreeBSD ELF64, nosys), rip = 0x8003b0a1a, rsp = 0x7fffdfffdbb8, rbp = 0x7fffdfffdf90 --- +# KDB: enter: panic +# [ thread pid 45836 tid 101772 ] +# Stopped at kdb_enter+0x37: movq $0,0x10ac846(%rip) +# db> x/s version +# version: FreeBSD 13.0-CURRENT #0 r366401: Sat Oct 3 19:00:37 CEST 2020 +# pho@t2.osted.lan:/usr/src/sys/amd64/compile/PHO +# db> + +# $FreeBSD$ + +[ `uname -p` != "amd64" ] && exit 0 + +. ../default.cfg +kldstat -v | grep -q sctp || kldload sctp.ko + +cat > /tmp/syzkaller25.c <<EOF +// https://syzkaller.appspot.com/bug?id=2e4fc04b5a5775777770f7244613571ca85da78a +// autogenerated by syzkaller (https://github.com/google/syzkaller) +// Reported-by: syzbot+77fcf6a9d28f301bc2e5@syzkaller.appspotmail.com + +#define _GNU_SOURCE + +#include <sys/types.h> + +#include <dirent.h> +#include <errno.h> +#include <pthread.h> +#include <pwd.h> +#include <setjmp.h> +#include <signal.h> +#include <stdarg.h> +#include <stdbool.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/endian.h> +#include <sys/resource.h> +#include <sys/stat.h> +#include <sys/syscall.h> +#include <sys/wait.h> +#include <time.h> +#include <unistd.h> + +static unsigned long long procid; + +static __thread int skip_segv; +static __thread jmp_buf segv_env; + +static void segv_handler(int sig, siginfo_t* info, void* ctx __unused) +{ + 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 (sig == SIGBUS) { + valid = 1; + } + 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_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 kill_and_wait(int pid, int* status) +{ + kill(pid, SIGKILL); + while (waitpid(-1, status, 0) != pid) { + } +} + +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 __attribute__((noinline)) remove_dir(const char* dir) +{ + DIR* dp = opendir(dir); + if (dp == NULL) { + if (errno == EACCES) { + if (rmdir(dir)) + exit(1); + return; + } + 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); + struct stat st; + if (lstat(filename, &st)) + exit(1); + if (S_ISDIR(st.st_mode)) { + remove_dir(filename); + continue; + } + if (unlink(filename)) + exit(1); + } + closedir(dp); + if (rmdir(dir)) + 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 { + pthread_mutex_t mu; + pthread_cond_t cv; + int state; +} event_t; + +static void event_init(event_t* ev) +{ + if (pthread_mutex_init(&ev->mu, 0)) + exit(1); + if (pthread_cond_init(&ev->cv, 0)) + exit(1); + ev->state = 0; +} + +static void event_reset(event_t* ev) +{ + ev->state = 0; +} + +static void event_set(event_t* ev) +{ + pthread_mutex_lock(&ev->mu); + if (ev->state) + exit(1); + ev->state = 1; + pthread_mutex_unlock(&ev->mu); + pthread_cond_broadcast(&ev->cv); +} + +static void event_wait(event_t* ev) +{ + pthread_mutex_lock(&ev->mu); + while (!ev->state) + pthread_cond_wait(&ev->cv, &ev->mu); + pthread_mutex_unlock(&ev->mu); +} + +static int event_isset(event_t* ev) +{ + pthread_mutex_lock(&ev->mu); + int res = ev->state; + pthread_mutex_unlock(&ev->mu); + return res; +} + +static int event_timedwait(event_t* ev, uint64_t timeout) +{ + uint64_t start = current_time_ms(); + uint64_t now = start; + pthread_mutex_lock(&ev->mu); + for (;;) { + if (ev->state) + break; + uint64_t remain = timeout - (now - start); + struct timespec ts; + ts.tv_sec = remain / 1000; + ts.tv_nsec = (remain % 1000) * 1000 * 1000; + pthread_cond_timedwait(&ev->cv, &ev->mu, &ts); + now = current_time_ms(); + if (now - start > timeout) + break; + } + int res = ev->state; + pthread_mutex_unlock(&ev->mu); + return res; +} + +static void sandbox_common() +{ + if (setsid() == -1) + exit(1); + struct rlimit rlim; + rlim.rlim_cur = rlim.rlim_max = 128 << 20; + setrlimit(RLIMIT_AS, &rlim); + rlim.rlim_cur = rlim.rlim_max = 8 << 20; + setrlimit(RLIMIT_MEMLOCK, &rlim); + rlim.rlim_cur = rlim.rlim_max = 1 << 20; + setrlimit(RLIMIT_FSIZE, &rlim); + rlim.rlim_cur = rlim.rlim_max = 1 << 20; + setrlimit(RLIMIT_STACK, &rlim); + rlim.rlim_cur = rlim.rlim_max = 0; + setrlimit(RLIMIT_CORE, &rlim); + rlim.rlim_cur = rlim.rlim_max = 256; + setrlimit(RLIMIT_NOFILE, &rlim); +} + +static void loop(); + +static int do_sandbox_none(void) +{ + sandbox_common(); + loop(); + return 0; +} + +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; + int collide = 0; +again: + for (call = 0; call < 4; 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 (collide && (call % 2) == 0) + break; + event_timedwait(&th->done, 45); + break; + } + } + for (i = 0; i < 100 && __atomic_load_n(&running, __ATOMIC_RELAXED); i++) + sleep_ms(1); + if (!collide) { + collide = 1; + goto again; + } +} + +static void execute_one(void); + +#define WAIT_FLAGS 0 + +static void loop(void) +{ + int iter = 0; + for (;; iter++) { + char cwdbuf[32]; + sprintf(cwdbuf, "./%d", iter); + if (mkdir(cwdbuf, 0777)) + exit(1); + int pid = fork(); + if (pid < 0) + exit(1); + if (pid == 0) { + if (chdir(cwdbuf)) + exit(1); + 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 < 5 * 1000) + continue; + kill_and_wait(pid, &status); + break; + } + remove_dir(cwdbuf); + } +} + +uint64_t r[1] = {0xffffffffffffffff}; + +void execute_call(int call) +{ + intptr_t res = 0; + switch (call) { + case 0: + res = syscall(SYS_socket, 2ul, 5ul, 0x84); + if (res != -1) + r[0] = res; + break; + case 1: + NONFAILING(*(uint8_t*)0x20000300 = 0x10); + NONFAILING(*(uint8_t*)0x20000301 = 2); + NONFAILING(*(uint16_t*)0x20000302 = htobe16(0x4e23 + procid * 4)); + NONFAILING(*(uint32_t*)0x20000304 = htobe32(0)); + NONFAILING(*(uint8_t*)0x20000308 = 0); + NONFAILING(*(uint8_t*)0x20000309 = 0); + NONFAILING(*(uint8_t*)0x2000030a = 0); + NONFAILING(*(uint8_t*)0x2000030b = 0); + NONFAILING(*(uint8_t*)0x2000030c = 0); + NONFAILING(*(uint8_t*)0x2000030d = 0); + NONFAILING(*(uint8_t*)0x2000030e = 0); + NONFAILING(*(uint8_t*)0x2000030f = 0); + syscall(SYS_bind, r[0], 0x20000300ul, 0x10ul); + break; + case 2: + NONFAILING(*(uint8_t*)0x20000040 = 0x10); + NONFAILING(*(uint8_t*)0x20000041 = 2); + NONFAILING(*(uint16_t*)0x20000042 = htobe16(0x4e23 + procid * 4)); + NONFAILING(*(uint32_t*)0x20000044 = htobe32(0x7f000001)); + NONFAILING(*(uint8_t*)0x20000048 = 0); + NONFAILING(*(uint8_t*)0x20000049 = 0); + NONFAILING(*(uint8_t*)0x2000004a = 0); + NONFAILING(*(uint8_t*)0x2000004b = 0); + NONFAILING(*(uint8_t*)0x2000004c = 0); + NONFAILING(*(uint8_t*)0x2000004d = 0); + NONFAILING(*(uint8_t*)0x2000004e = 0); + NONFAILING(*(uint8_t*)0x2000004f = 0); + syscall(SYS_connect, r[0], 0x20000040ul, 0x10ul); + break; + case 3: + NONFAILING(*(uint8_t*)0x20000000 = 0x10); + NONFAILING(*(uint8_t*)0x20000001 = 2); + NONFAILING(*(uint16_t*)0x20000002 = htobe16(0x4e23 + procid * 4)); + NONFAILING(*(uint8_t*)0x20000004 = 0xac); + NONFAILING(*(uint8_t*)0x20000005 = 0x14); + NONFAILING(*(uint8_t*)0x20000006 = 0 + procid * 1); + NONFAILING(*(uint8_t*)0x20000007 = 0xaa); + NONFAILING(*(uint8_t*)0x20000008 = 0); + NONFAILING(*(uint8_t*)0x20000009 = 0); + NONFAILING(*(uint8_t*)0x2000000a = 0); + NONFAILING(*(uint8_t*)0x2000000b = 0); + NONFAILING(*(uint8_t*)0x2000000c = 0); + NONFAILING(*(uint8_t*)0x2000000d = 0); + NONFAILING(*(uint8_t*)0x2000000e = 0); + NONFAILING(*(uint8_t*)0x2000000f = 0); + syscall(SYS_connect, r[0], 0x20000000ul, 0x10ul); + break; + } +} +int main(void) *** DIFF OUTPUT TRUNCATED AT 1000 LINES ***
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