// https://syzkaller.appspot.com/bug?id=478fc753a448c1fab3f34b5147fbaab0a134f3c6 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #ifndef __NR_seccomp #define __NR_seccomp 317 #endif 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 { unsigned long nb = a1; char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf) - 1); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(nb % 10); nb /= 10; } return open(buf, a2, 0); } } uint64_t r[5] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0}; int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffffffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200000000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x200001000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/(intptr_t)-1, /*offset=*/0ul); const char* reason; (void)reason; intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } // seccomp$SECCOMP_SET_MODE_FILTER_LISTENER arguments: [ // op: const = 0x1 (8 bytes) // flags: seccomp_flags_listener = 0x0 (8 bytes) // arg: ptr[in, sock_fprog] { // sock_fprog { // len: len = 0x1 (2 bytes) // pad = 0x0 (6 bytes) // filter: ptr[in, array[sock_filter]] { // array[sock_filter] { // sock_filter { // code: int16 = 0x6 (2 bytes) // jt: int8 = 0x0 (1 bytes) // jf: int8 = 0x0 (1 bytes) // k: int32 = 0x7fff0006 (4 bytes) // } // } // } // } // } // ] // returns fd_seccomp *(uint16_t*)0x2000000000c0 = 1; *(uint64_t*)0x2000000000c8 = 0x200000000000; *(uint16_t*)0x200000000000 = 6; *(uint8_t*)0x200000000002 = 0; *(uint8_t*)0x200000000003 = 0; *(uint32_t*)0x200000000004 = 0x7fff0006; res = syscall(__NR_seccomp, /*op=*/1ul, /*flags=*/0ul, /*arg=*/0x2000000000c0ul); if (res != -1) r[0] = res; // openat$dma_heap arguments: [ // fd: const = 0xffffffffffffff9c (8 bytes) // file: ptr[in, buffer] { // buffer: {2f 64 65 76 2f 64 6d 61 5f 68 65 61 70 2f 73 79 73 74 65 6d // 00} (length 0x15) // } // flags: open_flags = 0x20102 (4 bytes) // mode: const = 0x0 (2 bytes) // ] // returns fd_dma_heap memcpy((void*)0x200000000340, "/dev/dma_heap/system\000", 21); res = syscall(__NR_openat, /*fd=*/0xffffffffffffff9cul, /*file=*/0x200000000340ul, /*flags=O_NOFOLLOW|O_NOCTTY|O_RDWR*/ 0x20102, /*mode=*/0); if (res != -1) r[1] = res; // ioctl$DMA_HEAP_IOCTL_ALLOC arguments: [ // fd: fd_dma_heap (resource) // cmd: const = 0xc0184800 (4 bytes) // arg: ptr[inout, dma_heap_allocation_data] { // dma_heap_allocation_data { // len: int64 = 0x20004 (8 bytes) // fd: fd (resource) // fd_flags: dma_open_flags = 0x80000 (4 bytes) // heap_flags: const = 0x0 (8 bytes) // } // } // ] *(uint64_t*)0x200000000100 = 0x20004; *(uint32_t*)0x200000000108 = r[0]; *(uint32_t*)0x20000000010c = 0x80000; *(uint64_t*)0x200000000110 = 0; res = syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0xc0184800, /*arg=*/0x200000000100ul); if (res != -1) r[2] = *(uint32_t*)0x200000000108; // syz_open_dev$dri arguments: [ // dev: ptr[in, buffer] { // buffer: {2f 64 65 76 2f 64 72 69 2f 63 61 72 64 23 00} (length 0xf) // } // id: intptr = 0x1ff (8 bytes) // flags: open_flags = 0x80000 (8 bytes) // ] // returns fd_dri memcpy((void*)0x200000000280, "/dev/dri/card#\000", 15); res = -1; res = syz_open_dev(/*dev=*/0x200000000280, /*id=*/0x1ff, /*flags=O_CLOEXEC*/ 0x80000); if (res != -1) r[3] = res; // ioctl$DRM_IOCTL_PRIME_FD_TO_HANDLE arguments: [ // fd: fd_dri (resource) // cmd: const = 0xc00c642e (4 bytes) // arg: ptr[inout, drm_prime_handle$DRM_IOCTL_PRIME_FD_TO_HANDLE] { // drm_prime_handle$DRM_IOCTL_PRIME_FD_TO_HANDLE { // handle: drm_gem_handle (resource) // flags: const = 0x0 (4 bytes) // fd: fd_dri (resource) // } // } // ] *(uint32_t*)0x2000000000c4 = 0; *(uint32_t*)0x2000000000c8 = r[2]; res = syscall(__NR_ioctl, /*fd=*/r[3], /*cmd=*/0xc00c642e, /*arg=*/0x2000000000c0ul); if (res != -1) r[4] = *(uint32_t*)0x2000000000c0; // ioctl$DRM_IOCTL_GEM_FLINK arguments: [ // fd: fd_dri (resource) // cmd: const = 0xc00864d2 (4 bytes) // arg: ptr[inout, drm_gem_flink] { // drm_gem_flink { // handle: drm_gem_handle (resource) // name: drm_gem_name (resource) // } // } // ] *(uint32_t*)0x200000000080 = r[4]; syscall(__NR_ioctl, /*fd=*/r[3], /*cmd=*/0xc00864d2, /*arg=*/0x200000000080ul); return 0; }