| // KASAN: use-after-free Read in snd_timer_process_callbacks |
| // https://syzkaller.appspot.com/bug?id=c45c729acf79a28024d696e933e418b1c7a4a300 |
| // status:fixed |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <dirent.h> |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <sched.h> |
| #include <signal.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/mount.h> |
| #include <sys/prctl.h> |
| #include <sys/resource.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/time.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <time.h> |
| #include <unistd.h> |
| |
| 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; |
| } |
| |
| static long syz_open_dev(volatile long a0, volatile long a1, volatile long a2) |
| { |
| if (a0 == 0xc || a0 == 0xb) { |
| char buf[128]; |
| sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, |
| (uint8_t)a2); |
| return open(buf, O_RDWR, 0); |
| } else { |
| char buf[1024]; |
| char* hash; |
| strncpy(buf, (char*)a0, sizeof(buf) - 1); |
| buf[sizeof(buf) - 1] = 0; |
| while ((hash = strchr(buf, '#'))) { |
| *hash = '0' + (char)(a1 % 10); |
| a1 /= 10; |
| } |
| return open(buf, a2, 0); |
| } |
| } |
| |
| static void setup_common() |
| { |
| if (mount(0, "/sys/fs/fuse/connections", "fusectl", 0, 0)) { |
| } |
| } |
| |
| static void loop(); |
| |
| static void sandbox_common() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| setsid(); |
| struct rlimit rlim; |
| rlim.rlim_cur = rlim.rlim_max = (200 << 20); |
| setrlimit(RLIMIT_AS, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 32 << 20; |
| setrlimit(RLIMIT_MEMLOCK, &rlim); |
| rlim.rlim_cur = rlim.rlim_max = 136 << 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); |
| if (unshare(CLONE_NEWNS)) { |
| } |
| if (unshare(CLONE_NEWIPC)) { |
| } |
| if (unshare(0x02000000)) { |
| } |
| if (unshare(CLONE_NEWUTS)) { |
| } |
| if (unshare(CLONE_SYSVSEM)) { |
| } |
| typedef struct { |
| const char* name; |
| const char* value; |
| } sysctl_t; |
| static const sysctl_t sysctls[] = { |
| {"/proc/sys/kernel/shmmax", "16777216"}, |
| {"/proc/sys/kernel/shmall", "536870912"}, |
| {"/proc/sys/kernel/shmmni", "1024"}, |
| {"/proc/sys/kernel/msgmax", "8192"}, |
| {"/proc/sys/kernel/msgmni", "1024"}, |
| {"/proc/sys/kernel/msgmnb", "1024"}, |
| {"/proc/sys/kernel/sem", "1024 1048576 500 1024"}, |
| }; |
| unsigned i; |
| for (i = 0; i < sizeof(sysctls) / sizeof(sysctls[0]); i++) |
| write_file(sysctls[i].name, sysctls[i].value); |
| } |
| |
| int wait_for_loop(int pid) |
| { |
| if (pid < 0) |
| exit(1); |
| int status = 0; |
| while (waitpid(-1, &status, __WALL) != pid) { |
| } |
| return WEXITSTATUS(status); |
| } |
| |
| static int do_sandbox_none(void) |
| { |
| if (unshare(CLONE_NEWPID)) { |
| } |
| int pid = fork(); |
| if (pid != 0) |
| return wait_for_loop(pid); |
| setup_common(); |
| sandbox_common(); |
| if (unshare(CLONE_NEWNET)) { |
| } |
| loop(); |
| exit(1); |
| } |
| |
| static void kill_and_wait(int pid, int* status) |
| { |
| kill(-pid, SIGKILL); |
| kill(pid, SIGKILL); |
| int i; |
| for (i = 0; i < 100; i++) { |
| if (waitpid(-1, status, WNOHANG | __WALL) == pid) |
| return; |
| usleep(1000); |
| } |
| DIR* dir = opendir("/sys/fs/fuse/connections"); |
| if (dir) { |
| for (;;) { |
| struct dirent* ent = readdir(dir); |
| if (!ent) |
| break; |
| if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) |
| continue; |
| char abort[300]; |
| snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", |
| ent->d_name); |
| int fd = open(abort, O_WRONLY); |
| if (fd == -1) { |
| continue; |
| } |
| if (write(fd, abort, 1) < 0) { |
| } |
| close(fd); |
| } |
| closedir(dir); |
| } else { |
| } |
| while (waitpid(-1, status, __WALL) != pid) { |
| } |
| } |
| |
| #define SYZ_HAVE_SETUP_TEST 1 |
| static void setup_test() |
| { |
| prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); |
| setpgrp(); |
| write_file("/proc/self/oom_score_adj", "1000"); |
| } |
| |
| #define SYZ_HAVE_CLOSE_FDS 1 |
| static void close_fds() |
| { |
| int fd; |
| for (fd = 3; fd < 30; fd++) |
| close(fd); |
| } |
| |
| static void execute_one(void); |
| |
| #define WAIT_FLAGS __WALL |
| |
| static void loop(void) |
| { |
| int iter; |
| for (iter = 0;; iter++) { |
| int pid = fork(); |
| if (pid < 0) |
| exit(1); |
| if (pid == 0) { |
| setup_test(); |
| execute_one(); |
| close_fds(); |
| 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; |
| } |
| } |
| } |
| |
| #ifndef __NR_memfd_create |
| #define __NR_memfd_create 319 |
| #endif |
| |
| uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; |
| |
| void execute_one(void) |
| { |
| long res = 0; |
| memcpy((void*)0x200000c0, |
| "queue1\000\000\000\000\000\000\000\0001;" |
| "\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000" |
| "\001\004\000\000\000\000\000\000\000\314\277}" |
| "\335\000\000\000\000\000\000\000\000\000\000\000\000\000\262\036\000", |
| 62); |
| res = syscall(__NR_memfd_create, 0x200000c0, 0); |
| if (res != -1) |
| r[0] = res; |
| memcpy((void*)0x20000040, "/dev/snd/seq\000", 13); |
| res = syz_open_dev(0x20000040, 0, 0x100000000000001); |
| if (res != -1) |
| r[1] = res; |
| syscall(__NR_dup2, r[1], r[0]); |
| *(uint32_t*)0x20000200 = 0; |
| *(uint32_t*)0x20000204 = 0; |
| *(uint32_t*)0x20000208 = 0; |
| memcpy((void*)0x2000020c, "queue0\000\000\000\000\000\000\000\000\000\000\000" |
| "\000\000\000\000\000\000\000\000\000\000\000\000" |
| "\000\000\000\000\000\000\000\000\000\000\000\000" |
| "\000\000\000\000\000\000\000\000\000\000\000\000" |
| "\000\000\000\000\000\000\000\000\000\000\000", |
| 64); |
| *(uint32_t*)0x2000024c = 0; |
| *(uint8_t*)0x20000250 = 0; |
| *(uint8_t*)0x20000251 = 0; |
| *(uint8_t*)0x20000252 = 0; |
| *(uint8_t*)0x20000253 = 0; |
| *(uint8_t*)0x20000254 = 0; |
| *(uint8_t*)0x20000255 = 0; |
| *(uint8_t*)0x20000256 = 0; |
| *(uint8_t*)0x20000257 = 0; |
| *(uint8_t*)0x20000258 = 0; |
| *(uint8_t*)0x20000259 = 0; |
| *(uint8_t*)0x2000025a = 0; |
| *(uint8_t*)0x2000025b = 0; |
| *(uint8_t*)0x2000025c = 0; |
| *(uint8_t*)0x2000025d = 0; |
| *(uint8_t*)0x2000025e = 0; |
| *(uint8_t*)0x2000025f = 0; |
| *(uint8_t*)0x20000260 = 0; |
| *(uint8_t*)0x20000261 = 0; |
| *(uint8_t*)0x20000262 = 0; |
| *(uint8_t*)0x20000263 = 0; |
| *(uint8_t*)0x20000264 = 0; |
| *(uint8_t*)0x20000265 = 0; |
| *(uint8_t*)0x20000266 = 0; |
| *(uint8_t*)0x20000267 = 0; |
| *(uint8_t*)0x20000268 = 0; |
| *(uint8_t*)0x20000269 = 0; |
| *(uint8_t*)0x2000026a = 0; |
| *(uint8_t*)0x2000026b = 0; |
| *(uint8_t*)0x2000026c = 0; |
| *(uint8_t*)0x2000026d = 0; |
| *(uint8_t*)0x2000026e = 0; |
| *(uint8_t*)0x2000026f = 0; |
| *(uint8_t*)0x20000270 = 0; |
| *(uint8_t*)0x20000271 = 0; |
| *(uint8_t*)0x20000272 = 0; |
| *(uint8_t*)0x20000273 = 0; |
| *(uint8_t*)0x20000274 = 0; |
| *(uint8_t*)0x20000275 = 0; |
| *(uint8_t*)0x20000276 = 0; |
| *(uint8_t*)0x20000277 = 0; |
| *(uint8_t*)0x20000278 = 0; |
| *(uint8_t*)0x20000279 = 0; |
| *(uint8_t*)0x2000027a = 0; |
| *(uint8_t*)0x2000027b = 0; |
| *(uint8_t*)0x2000027c = 0; |
| *(uint8_t*)0x2000027d = 0; |
| *(uint8_t*)0x2000027e = 0; |
| *(uint8_t*)0x2000027f = 0; |
| *(uint8_t*)0x20000280 = 0; |
| *(uint8_t*)0x20000281 = 0; |
| *(uint8_t*)0x20000282 = 0; |
| *(uint8_t*)0x20000283 = 0; |
| *(uint8_t*)0x20000284 = 0; |
| *(uint8_t*)0x20000285 = 0; |
| *(uint8_t*)0x20000286 = 0; |
| *(uint8_t*)0x20000287 = 0; |
| *(uint8_t*)0x20000288 = 0; |
| *(uint8_t*)0x20000289 = 0; |
| *(uint8_t*)0x2000028a = 0; |
| *(uint8_t*)0x2000028b = 0; |
| syscall(__NR_ioctl, r[1], 0xc08c5332, 0x20000200); |
| *(uint8_t*)0x20000000 = 0; |
| *(uint8_t*)0x20000001 = 0; |
| *(uint8_t*)0x20000002 = 0; |
| *(uint8_t*)0x20000003 = 0; |
| *(uint32_t*)0x20000008 = 0; |
| *(uint8_t*)0x20000018 = 0; |
| *(uint8_t*)0x20000019 = 0; |
| *(uint8_t*)0x2000001a = 0; |
| *(uint8_t*)0x2000001b = 0; |
| *(uint8_t*)0x20000020 = 0; |
| *(uint8_t*)0x20000021 = 0; |
| *(uint8_t*)0x20000022 = 0; |
| *(uint8_t*)0x20000023 = 0; |
| syscall(__NR_write, r[0], 0x20000000, 0xffffff76); |
| } |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| do_sandbox_none(); |
| return 0; |
| } |