189 lines
10 KiB
JSON
189 lines
10 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2025-40288",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-04-16T07:20:57.184Z",
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"datePublished": "2025-12-06T21:51:14.440Z",
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"dateUpdated": "2026-05-11T21:46:27.181Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-05-11T21:46:27.181Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amdgpu: Fix NULL pointer dereference in VRAM logic for APU devices\n\nPreviously, APU platforms (and other scenarios with uninitialized VRAM managers)\ntriggered a NULL pointer dereference in `ttm_resource_manager_usage()`. The root\ncause is not that the `struct ttm_resource_manager *man` pointer itself is NULL,\nbut that `man->bdev` (the backing device pointer within the manager) remains\nuninitialized (NULL) on APUs—since APUs lack dedicated VRAM and do not fully\nset up VRAM manager structures. When `ttm_resource_manager_usage()` attempts to\nacquire `man->bdev->lru_lock`, it dereferences the NULL `man->bdev`, leading to\na kernel OOPS.\n\n1. **amdgpu_cs.c**: Extend the existing bandwidth control check in\n `amdgpu_cs_get_threshold_for_moves()` to include a check for\n `ttm_resource_manager_used()`. If the manager is not used (uninitialized\n `bdev`), return 0 for migration thresholds immediately—skipping VRAM-specific\n logic that would trigger the NULL dereference.\n\n2. **amdgpu_kms.c**: Update the `AMDGPU_INFO_VRAM_USAGE` ioctl and memory info\n reporting to use a conditional: if the manager is used, return the real VRAM\n usage; otherwise, return 0. This avoids accessing `man->bdev` when it is\n NULL.\n\n3. **amdgpu_virt.c**: Modify the vf2pf (virtual function to physical function)\n data write path. Use `ttm_resource_manager_used()` to check validity: if the\n manager is usable, calculate `fb_usage` from VRAM usage; otherwise, set\n `fb_usage` to 0 (APUs have no discrete framebuffer to report).\n\nThis approach is more robust than APU-specific checks because it:\n- Works for all scenarios where the VRAM manager is uninitialized (not just APUs),\n- Aligns with TTM's design by using its native helper function,\n- Preserves correct behavior for discrete GPUs (which have fully initialized\n `man->bdev` and pass the `ttm_resource_manager_used()` check).\n\nv4: use ttm_resource_manager_used(&adev->mman.vram_mgr.manager) instead of checking the adev->gmc.is_app_apu flag (Christian)"
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c",
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"drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c",
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"drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c"
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],
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"versions": [
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{
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"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21",
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"lessThan": "e70113b741ba253886cd71dbadfe3ea444bb2f5c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21",
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"lessThan": "1243e396148a65bb6c42a2b70fe43e50c16c494f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21",
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"lessThan": "43aa61c18a3a45042b098b7a1186ffb29364002c",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21",
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"lessThan": "070bdce18fb12a49eb9c421e57df17d2ad29bf5f",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "d38ceaf99ed015f2a0b9af3499791bd3a3daae21",
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"lessThan": "883f309add55060233bf11c1ea6947140372920f",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c",
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"drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c",
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"drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c"
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],
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"versions": [
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{
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"version": "4.2",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "4.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.159",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.117",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.59",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.17.9",
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"lessThanOrEqual": "6.17.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.2",
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"versionEndExcluding": "6.1.159"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.2",
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"versionEndExcluding": "6.6.117"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.2",
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"versionEndExcluding": "6.12.59"
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"versionStartIncluding": "4.2",
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"versionEndExcluding": "6.17.9"
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.2",
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"versionEndExcluding": "6.18"
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/e70113b741ba253886cd71dbadfe3ea444bb2f5c"
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},
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{
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"url": "https://git.kernel.org/stable/c/1243e396148a65bb6c42a2b70fe43e50c16c494f"
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},
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{
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"url": "https://git.kernel.org/stable/c/43aa61c18a3a45042b098b7a1186ffb29364002c"
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},
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{
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"url": "https://git.kernel.org/stable/c/070bdce18fb12a49eb9c421e57df17d2ad29bf5f"
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},
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{
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"url": "https://git.kernel.org/stable/c/883f309add55060233bf11c1ea6947140372920f"
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}
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],
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"title": "drm/amdgpu: Fix NULL pointer dereference in VRAM logic for APU devices",
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"x_generator": {
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} |