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OpenCL Backend: added workaround to set device_available_memory from CUDA/HIP alias device

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This commit is contained in:
Gabriele Gristina 2025-06-07 20:22:01 +02:00
parent 2af580b448
commit 12f1fe56aa
2 changed files with 143 additions and 91 deletions
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1
docs/changes.txt
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@ -130,6 +130,7 @@
- Modules: Added support for non-zero IVs for -m 6800 (Lastpass). Also added `tools/lastpass2hashcat.py`
- Modules: Updated module_unstable_warning
- Open Document Format: Added support for small documents with content length < 1024
- OpenCL Backend: added workaround to set device_available_memory from CUDA/HIP alias device
- Status Code: Add specific return code for self-test fail (-11)
- Scrypt: Increase buffer sizes in module for hash mode 8900 to allow longer scrypt digests
- Unicode: Update UTF-8 to UTF-16 conversion to match RFC 3629

233
src/backend.c
View File

@ -8362,114 +8362,165 @@ int backend_ctx_devices_init (hashcat_ctx_t *hashcat_ctx, const int comptime)
*/
}
// available device memory
// This test causes an GPU memory usage spike.
// In case there are multiple hashcat instances starting at the same time this will cause GPU out of memory errors which otherwise would not exist.
// We will simply not run it if that device was skipped by the user.
// available device memory
// first trying to check if we can get device_available_mem from cuda/hip alias device
if (device_param->device_global_mem)
bool updated_device_available_mem = false;
if (device_param->opencl_device_type & CL_DEVICE_TYPE_GPU)
{
#define MAX_ALLOC_CHECKS_CNT 8192
#define MAX_ALLOC_CHECKS_SIZE (64 * 1024 * 1024)
device_param->device_available_mem = device_param->device_global_mem - MAX_ALLOC_CHECKS_SIZE;
if (user_options->backend_devices_keepfree)
if (device_param->opencl_platform_vendor_id == VENDOR_ID_NV)
{
device_param->device_available_mem = (device_param->device_global_mem * (100 - user_options->backend_devices_keepfree)) / 100;
if (backend_ctx->cuda_devices_cnt > 0 && backend_ctx->cuda_devices_active > 0)
{
for (int cuda_devices_idx = 0; cuda_devices_idx < backend_ctx->cuda_devices_cnt; cuda_devices_idx++)
{
const int tmp_backend_devices_idx = backend_ctx->backend_device_from_cuda[cuda_devices_idx];
hc_device_param_t *tmp_device_param = backend_ctx->devices_param + tmp_backend_devices_idx;
if (is_same_device (device_param, tmp_device_param))
{
device_param->device_available_mem = tmp_device_param->device_available_mem;
updated_device_available_mem = true;
break;
}
}
}
}
// this section is creating more problems than it solves, so lets use a fixed multiplier instead
// users can override with --backend-devices-keepfree=0
else if ((device_param->opencl_device_type & CL_DEVICE_TYPE_GPU) && (device_param->device_host_unified_memory == 0))
else if (device_param->opencl_platform_vendor_id == VENDOR_ID_AMD)
{
// OK, so the problem here is the following:
// There's just CL_DEVICE_GLOBAL_MEM_SIZE to ask OpenCL about the total memory on the device,
// but there's no way to ask for available memory on the device.
// In combination, most OpenCL runtimes implementation of clCreateBuffer()
// are doing so called lazy memory allocation on the device.
// Now, if the user has X11 (or a game or anything that takes a lot of GPU memory)
// running on the host we end up with an error type of this:
// clEnqueueNDRangeKernel(): CL_MEM_OBJECT_ALLOCATION_FAILURE
// The clEnqueueNDRangeKernel() is because of the lazy allocation
// The best way to workaround this problem is if we would be able to ask for available memory,
// The idea here is to try to evaluate available memory by allocating it till it errors
cl_mem *tmp_device = (cl_mem *) hccalloc (MAX_ALLOC_CHECKS_CNT, sizeof (cl_mem));
u64 c;
for (c = 0; c < MAX_ALLOC_CHECKS_CNT; c++)
if (backend_ctx->hip_devices_cnt > 0 && backend_ctx->hip_devices_active > 0)
{
if (((c + 1 + 1) * MAX_ALLOC_CHECKS_SIZE) >= device_param->device_global_mem) break;
// work around, for some reason apple opencl can't have buffers larger 2^31
// typically runs into trap 6
// maybe 32/64 bit problem affecting size_t?
// this seems to affect global memory as well no just single allocations
if ((device_param->opencl_platform_vendor_id == VENDOR_ID_APPLE) && (device_param->is_metal == false))
for (int hip_devices_idx = 0; hip_devices_idx < backend_ctx->hip_devices_cnt; hip_devices_idx++)
{
const size_t undocumented_single_allocation_apple = 0x7fffffff;
const int tmp_backend_devices_idx = backend_ctx->backend_device_from_hip[hip_devices_idx];
if (((c + 1 + 1) * MAX_ALLOC_CHECKS_SIZE) >= undocumented_single_allocation_apple) break;
}
hc_device_param_t *tmp_device_param = backend_ctx->devices_param + tmp_backend_devices_idx;
cl_int CL_err;
OCL_PTR *ocl = (OCL_PTR *) backend_ctx->ocl;
tmp_device[c] = ocl->clCreateBuffer (context, CL_MEM_READ_WRITE, MAX_ALLOC_CHECKS_SIZE, NULL, &CL_err);
if (CL_err != CL_SUCCESS)
{
c--;
break;
}
// transfer only a few byte should be enough to force the runtime to actually allocate the memory
u8 tmp_host[8];
if (ocl->clEnqueueReadBuffer (command_queue, tmp_device[c], CL_TRUE, 0, sizeof (tmp_host), tmp_host, 0, NULL, NULL) != CL_SUCCESS) break;
if (ocl->clEnqueueWriteBuffer (command_queue, tmp_device[c], CL_TRUE, 0, sizeof (tmp_host), tmp_host, 0, NULL, NULL) != CL_SUCCESS) break;
if (ocl->clEnqueueReadBuffer (command_queue, tmp_device[c], CL_TRUE, MAX_ALLOC_CHECKS_SIZE - sizeof (tmp_host), sizeof (tmp_host), tmp_host, 0, NULL, NULL) != CL_SUCCESS) break;
if (ocl->clEnqueueWriteBuffer (command_queue, tmp_device[c], CL_TRUE, MAX_ALLOC_CHECKS_SIZE - sizeof (tmp_host), sizeof (tmp_host), tmp_host, 0, NULL, NULL) != CL_SUCCESS) break;
}
device_param->device_available_mem = MAX_ALLOC_CHECKS_SIZE;
if (c > 0)
{
device_param->device_available_mem *= c;
}
// clean up
for (c = 0; c < MAX_ALLOC_CHECKS_CNT; c++)
{
if (((c + 1 + 1) * MAX_ALLOC_CHECKS_SIZE) >= device_param->device_global_mem) break;
if (tmp_device[c] != NULL)
{
if (hc_clReleaseMemObject (hashcat_ctx, tmp_device[c]) == -1) return -1;
if (is_same_device (device_param, tmp_device_param))
{
device_param->device_available_mem = tmp_device_param->device_available_mem;
updated_device_available_mem = true;
break;
}
}
}
hcfree (tmp_device);
}
}
hc_clReleaseCommandQueue (hashcat_ctx, command_queue);
// if not found ... use old strategy
hc_clReleaseContext (hashcat_ctx, context);
if (device_param->device_host_unified_memory == 1)
if (updated_device_available_mem == false)
{
// so, we actually have only half the memory because we need the same buffers on host side
// This test causes an GPU memory usage spike.
// In case there are multiple hashcat instances starting at the same time this will cause GPU out of memory errors which otherwise would not exist.
// We will simply not run it if that device was skipped by the user.
device_param->device_available_mem /= 2;
if (device_param->device_global_mem)
{
#define MAX_ALLOC_CHECKS_CNT 8192
#define MAX_ALLOC_CHECKS_SIZE (64 * 1024 * 1024)
device_param->device_available_mem = device_param->device_global_mem - MAX_ALLOC_CHECKS_SIZE;
if (user_options->backend_devices_keepfree)
{
device_param->device_available_mem = (device_param->device_global_mem * (100 - user_options->backend_devices_keepfree)) / 100;
}
// this section is creating more problems than it solves, so lets use a fixed multiplier instead
// users can override with --backend-devices-keepfree=0
else if ((device_param->opencl_device_type & CL_DEVICE_TYPE_GPU) && (device_param->device_host_unified_memory == 0))
{
// OK, so the problem here is the following:
// There's just CL_DEVICE_GLOBAL_MEM_SIZE to ask OpenCL about the total memory on the device,
// but there's no way to ask for available memory on the device.
// In combination, most OpenCL runtimes implementation of clCreateBuffer()
// are doing so called lazy memory allocation on the device.
// Now, if the user has X11 (or a game or anything that takes a lot of GPU memory)
// running on the host we end up with an error type of this:
// clEnqueueNDRangeKernel(): CL_MEM_OBJECT_ALLOCATION_FAILURE
// The clEnqueueNDRangeKernel() is because of the lazy allocation
// The best way to workaround this problem is if we would be able to ask for available memory,
// The idea here is to try to evaluate available memory by allocating it till it errors
cl_mem *tmp_device = (cl_mem *) hccalloc (MAX_ALLOC_CHECKS_CNT, sizeof (cl_mem));
u64 c;
for (c = 0; c < MAX_ALLOC_CHECKS_CNT; c++)
{
if (((c + 1 + 1) * MAX_ALLOC_CHECKS_SIZE) >= device_param->device_global_mem) break;
// work around, for some reason apple opencl can't have buffers larger 2^31
// typically runs into trap 6
// maybe 32/64 bit problem affecting size_t?
// this seems to affect global memory as well no just single allocations
if ((device_param->opencl_platform_vendor_id == VENDOR_ID_APPLE) && (device_param->is_metal == false))
{
const size_t undocumented_single_allocation_apple = 0x7fffffff;
if (((c + 1 + 1) * MAX_ALLOC_CHECKS_SIZE) >= undocumented_single_allocation_apple) break;
}
cl_int CL_err;
OCL_PTR *ocl = (OCL_PTR *) backend_ctx->ocl;
tmp_device[c] = ocl->clCreateBuffer (context, CL_MEM_READ_WRITE, MAX_ALLOC_CHECKS_SIZE, NULL, &CL_err);
if (CL_err != CL_SUCCESS)
{
c--;
break;
}
// transfer only a few byte should be enough to force the runtime to actually allocate the memory
u8 tmp_host[8];
if (ocl->clEnqueueReadBuffer (command_queue, tmp_device[c], CL_TRUE, 0, sizeof (tmp_host), tmp_host, 0, NULL, NULL) != CL_SUCCESS) break;
if (ocl->clEnqueueWriteBuffer (command_queue, tmp_device[c], CL_TRUE, 0, sizeof (tmp_host), tmp_host, 0, NULL, NULL) != CL_SUCCESS) break;
if (ocl->clEnqueueReadBuffer (command_queue, tmp_device[c], CL_TRUE, MAX_ALLOC_CHECKS_SIZE - sizeof (tmp_host), sizeof (tmp_host), tmp_host, 0, NULL, NULL) != CL_SUCCESS) break;
if (ocl->clEnqueueWriteBuffer (command_queue, tmp_device[c], CL_TRUE, MAX_ALLOC_CHECKS_SIZE - sizeof (tmp_host), sizeof (tmp_host), tmp_host, 0, NULL, NULL) != CL_SUCCESS) break;
}
device_param->device_available_mem = MAX_ALLOC_CHECKS_SIZE;
if (c > 0)
{
device_param->device_available_mem *= c;
}
// clean up
for (c = 0; c < MAX_ALLOC_CHECKS_CNT; c++)
{
if (((c + 1 + 1) * MAX_ALLOC_CHECKS_SIZE) >= device_param->device_global_mem) break;
if (tmp_device[c] != NULL)
{
if (hc_clReleaseMemObject (hashcat_ctx, tmp_device[c]) == -1) return -1;
}
}
hcfree (tmp_device);
}
}
hc_clReleaseCommandQueue (hashcat_ctx, command_queue);
hc_clReleaseContext (hashcat_ctx, context);
if (device_param->device_host_unified_memory == 1)
{
// so, we actually have only half the memory because we need the same buffers on host side
device_param->device_available_mem /= 2;
}
}
}
}