| // possible deadlock in vprintk_emit |
| // https://syzkaller.appspot.com/bug?id=d32a06fd14ce7cccd6a41d18841b89be5a78b20b |
| // status:open |
| // autogenerated by syzkaller (https://github.com/google/syzkaller) |
| |
| #define _GNU_SOURCE |
| |
| #include <endian.h> |
| #include <errno.h> |
| #include <fcntl.h> |
| #include <stdarg.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <sys/ioctl.h> |
| #include <sys/stat.h> |
| #include <sys/syscall.h> |
| #include <sys/types.h> |
| #include <unistd.h> |
| |
| 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_pts(volatile long a0, volatile long a1) |
| { |
| int ptyno = 0; |
| if (ioctl(a0, TIOCGPTN, &ptyno)) |
| return -1; |
| char buf[128]; |
| sprintf(buf, "/dev/pts/%d", ptyno); |
| return open(buf, a1, 0); |
| } |
| |
| 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 + 1); |
| if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) |
| exit(1); |
| return fd; |
| } |
| |
| uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; |
| |
| int main(void) |
| { |
| syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); |
| long res = 0; |
| memcpy((void*)0x20000000, "/dev/ptmx\000", 10); |
| res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000000, 0, 0); |
| if (res != -1) |
| r[0] = res; |
| *(uint32_t*)0x20000600 = 0; |
| *(uint32_t*)0x20000604 = 0; |
| *(uint32_t*)0x20000608 = 0; |
| *(uint32_t*)0x2000060c = 0; |
| *(uint8_t*)0x20000610 = 0; |
| *(uint8_t*)0x20000611 = 0; |
| *(uint8_t*)0x20000612 = 0; |
| *(uint8_t*)0x20000613 = 0; |
| *(uint32_t*)0x20000614 = 0; |
| *(uint32_t*)0x20000618 = 0; |
| *(uint32_t*)0x2000061c = 0; |
| *(uint32_t*)0x20000620 = 0; |
| syscall(__NR_ioctl, r[0], 0x40045431, 0x20000600); |
| res = syz_open_pts(r[0], 0); |
| if (res != -1) |
| r[1] = res; |
| syscall(__NR_ioctl, r[1], 0x5402, 0); |
| *(uint32_t*)0x20000040 = 0x3ff; |
| *(uint32_t*)0x20000044 = 0; |
| *(uint32_t*)0x20000048 = 0; |
| *(uint32_t*)0x2000004c = 0; |
| *(uint8_t*)0x20000050 = 0; |
| *(uint8_t*)0x20000051 = 0; |
| *(uint8_t*)0x20000052 = 0; |
| *(uint8_t*)0x20000053 = 0; |
| *(uint32_t*)0x20000054 = 0; |
| *(uint32_t*)0x20000058 = 0; |
| *(uint32_t*)0x2000005c = 0; |
| *(uint32_t*)0x20000060 = 0; |
| write_file("/sys/kernel/debug/failslab/ignore-gfp-wait", "N"); |
| write_file("/sys/kernel/debug/fail_futex/ignore-private", "N"); |
| write_file("/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N"); |
| write_file("/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N"); |
| write_file("/sys/kernel/debug/fail_page_alloc/min-order", "0"); |
| inject_fault(0); |
| syscall(__NR_ioctl, r[1], 0x5412, 0x20000040); |
| return 0; |
| } |