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2 days, 9 hours

[PATCH v7 0/8] dma-buf: Use revoke mechanism to invalidate shared buffers

by Leon Romanovsky

Changelog: v7: * Fixed messed VFIO patch due to rebase. v6: https://patch.msgid.link/20260130-dmabuf-revoke-v6-0-06278f9b7bf0@nvidia.com * Added Reviewed-by tags. * Changed for blocking wait_for_completion() in VFIO * Fixed race between ->attach and move_notify, where priv->revoked is flipped and lock is released. v5: https://patch.msgid.link/20260124-dmabuf-revoke-v5-0-f98fca917e96@nvidia.com * Documented the DMA-BUF expectations around DMA unmap. * Added wait support in VFIO for DMA unmap. * Reordered patches. * Improved commit messages to document even more. v4: https://lore.kernel.org/all/20260121-dmabuf-revoke-v4-0-d311cbc8633d@nvidia… * Changed DMA_RESV_USAGE_KERNEL to DMA_RESV_USAGE_BOOKKEEP. * Made .invalidate_mapping() truly optional. * Added patch which renames dma_buf_move_notify() to be dma_buf_invalidate_mappings(). * Restored dma_buf_attachment_is_dynamic() function. v3: https://lore.kernel.org/all/20260120-dmabuf-revoke-v3-0-b7e0b07b8214@nvidia… * Used Jason's wordings for commits and cover letter. * Removed IOMMUFD patch. * Renamed dma_buf_attachment_is_revoke() to be dma_buf_attach_revocable(). * Added patch to remove CONFIG_DMABUF_MOVE_NOTIFY. * Added Reviewed-by tags. * Called to dma_resv_wait_timeout() after dma_buf_move_notify() in VFIO. * Added dma_buf_attach_revocable() check to VFIO DMABUF attach function. * Slightly changed commit messages. v2: https://patch.msgid.link/20260118-dmabuf-revoke-v2-0-a03bb27c0875@nvidia.com * Changed series to document the revoke semantics instead of implementing it. v1: https://patch.msgid.link/20260111-dmabuf-revoke-v1-0-fb4bcc8c259b@nvidia.com ------------------------------------------------------------------------- This series is based on latest VFIO fix, which will be sent to Linus very soon. https://lore.kernel.org/all/20260121-vfio-add-pin-v1-1-4e04916b17f1@nvidia.… Thanks ------------------------------------------------------------------------- This series documents a dma-buf “revoke” mechanism: to allow a dma-buf exporter to explicitly invalidate (“kill”) a shared buffer after it has been distributed to importers, so that further CPU and device access is prevented and importers reliably observe failure. The change in this series is to properly document and use existing core “revoked” state on the dma-buf object and a corresponding exporter-triggered revoke operation. dma-buf has quietly allowed calling move_notify on pinned dma-bufs, even though legacy importers using dma_buf_attach() would simply ignore these calls. The intention was that move_notify() would tell the importer to expedite it's unmapping process and once the importer is fully finished with DMA it would unmap the dma-buf which finally signals that the importer is no longer ever going to touch the memory again. Importers that touch past their unmap() call can trigger IOMMU errors, AER and beyond, however read-and-discard access between move_notify() and unmap is allowed. Thus, we can define the exporter's revoke sequence for pinned dma-buf as: dma_resv_lock(dmabuf->resv, NULL); // Prevent new mappings from being established priv->revoked = true; // Tell all importers to eventually unmap dma_buf_invalidate_mappings(dmabuf); // Wait for any inprogress fences on the old mapping dma_resv_wait_timeout(dmabuf->resv, DMA_RESV_USAGE_BOOKKEEP, false, MAX_SCHEDULE_TIMEOUT); dma_resv_unlock(dmabuf->resv, NULL); // Wait for all importers to complete unmap wait_for_completion(&priv->unmapp_comp); However, dma-buf also supports importers that don't do anything on move_notify(), and will not unmap the buffer in bounded time. Since such importers would cause the above sequence to hang, a new mechanism is needed to detect incompatible importers. Introduce dma_buf_attach_revocable() which if true indicates the above sequence is safe to use and will complete in kernel-only bounded time for this attachment. Unfortunately dma_buf_attach_revocable() is going to fail for the popular RDMA pinned importer, which means we cannot introduce it to existing places using pinned move_notify() without potentially breaking existing userspace flows. Existing exporters that only trigger this flow for RAS errors should not call dma_buf_attach_revocable() and will suffer an unbounded block on the final completion, hoping that the userspace will notice the RAS and clean things up. Without revoke support on the RDMA pinned importers it doesn't seem like any other non-breaking option is currently possible. For new exporters, like VFIO and RDMA, that have userspace triggered revoke events, the unbouned sleep would not be acceptable. They can call dma_buf_attach_revocable() and will not work with the RDMA pinned importer from day 0, preventing regressions. In the process add documentation explaining the above details. Thanks Signed-off-by: Leon Romanovsky <leonro(a)nvidia.com> --- Leon Romanovsky (8): dma-buf: Rename .move_notify() callback to a clearer identifier dma-buf: Rename dma_buf_move_notify() to dma_buf_invalidate_mappings() dma-buf: Always build with DMABUF_MOVE_NOTIFY vfio: Wait for dma-buf invalidation to complete dma-buf: Make .invalidate_mapping() truly optional dma-buf: Add dma_buf_attach_revocable() vfio: Permit VFIO to work with pinned importers iommufd: Add dma_buf_pin() drivers/dma-buf/Kconfig | 12 ----- drivers/dma-buf/dma-buf.c | 69 ++++++++++++++++++++----- drivers/gpu/drm/amd/amdgpu/amdgpu_dma_buf.c | 14 ++--- drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 2 +- drivers/gpu/drm/amd/amdkfd/Kconfig | 2 +- drivers/gpu/drm/virtio/virtgpu_prime.c | 2 +- drivers/gpu/drm/xe/tests/xe_dma_buf.c | 7 ++- drivers/gpu/drm/xe/xe_bo.c | 2 +- drivers/gpu/drm/xe/xe_dma_buf.c | 14 ++--- drivers/infiniband/core/umem_dmabuf.c | 13 ----- drivers/infiniband/hw/mlx5/mr.c | 2 +- drivers/iommu/iommufd/pages.c | 11 +++- drivers/iommu/iommufd/selftest.c | 2 +- drivers/vfio/pci/vfio_pci_dmabuf.c | 80 ++++++++++++++++++++++------- include/linux/dma-buf.h | 17 +++--- 15 files changed, 153 insertions(+), 96 deletions(-) --- base-commit: 61ceaf236115f20f4fdd7cf60f883ada1063349a change-id: 20251221-dmabuf-revoke-b90ef16e4236 Best regards, -- Leon Romanovsky <leonro(a)nvidia.com>

2 days, 20 hours

Cryptera Chain Signals Summary – Focus On Transparency During Recovery Process

by Yulie Morgan

After experiencing a bridge exploit I worked with Cryptera Chain Signals to understand the movement of funds. Their process was transparent from day one: secure intake, detailed mapping with multi-layer attribution, and regular updates with visual explanations. They showed how cross-chain hops complicated the trail and why some paths reach natural limits. The educational discussions helped me grasp broader concepts — immutable records, pattern detection, and behavioral analysis. Rather than technical overload, the explanations focused on what each step revealed about the incident. Recovery options were limited by timing, but the clarity removed guesswork. I particularly appreciated the practical security advice that followed: hardware wallet recommendations, seed phrase protection, and checks for anomalous activity. These became part of my routine. The engagement was professional, informative, and free of pressure. It provided both a factual account of the loss and lasting insights into safer crypto practices. Cryptera Chain Signals Website: https://www.crypterachainsignals.com Email: info(a)crypterachainsignals.com

3 days, 12 hours

Cryptera Chain Signals Experience – Realistic Forensics And Prevention Advice

by Yulie Morgan

Contacting Cryptera Chain Signals after an investment scheme loss gave me a clearer picture of how these situations unfold. The team started with basic evidence collection and quickly produced an initial transaction map using their multi-layer attribution system. They explained how funds typically travel through bridges and exchanges, and why certain movements reduce traceability. The realism stood out — they outlined limitations early rather than building false hope. At the same time they broke down technical elements into accessible parts, covering public ledger mechanics and clustering techniques. The final report helped me understand exactly where options ended. Beyond the analysis, the prevention guidance proved valuable. We reviewed common scheme tactics, due diligence steps for platforms, and wallet security fundamentals. I now use hardware devices, offline backups, and basic monitoring routines that were new to me. Updates were regular and focused on facts. The process combined professional forensics with genuine knowledge transfer that extended well past the case itself. Cryptera Chain Signals Website: https://www.crypterachainsignals.com Email: info(a)crypterachainsignals.com

3 days, 12 hours

Detailed Feedback On Cryptera Chain Signals Support And Educational Value

by Yulie Morgan

My experience with Cryptera Chain Signals began after a wallet compromise earlier this year. From the initial call they set clear expectations and focused only on the evidence I could safely provide. The forensic work used multi-layer attribution to reconstruct the path, showing clusters and patterns I would never have spotted myself. They took time to explain concepts like address reuse risks and how graph analysis reveals hidden connections. The report included simplified diagrams that made the entire flow understandable. Although full recovery was not feasible due to rapid dispersal, the transparency helped me move forward. The sessions on prevention were equally useful. We discussed phishing variations, social engineering red flags, and everyday protections such as hardware keys and regular transaction reviews. I left with concrete steps I now follow, including dedicated crypto emails and bookmark verification. The entire engagement felt measured and educational rather than rushed. It provided both closure on the incident and tools for better security going forward. Cryptera Chain Signals Website: https://www.crypterachainsignals.com Email: info(a)crypterachainsignals.com

3 days, 12 hours

Cryptera Chain Signals Review – Insights Gained From Forensics Engagement

by Yulie Morgan

I engaged Cryptera Chain Signals after funds disappeared from a DeFi platform in early 2026. Their background of 28 years and steady client ratings gave me confidence in the structured approach. The first step was a secure upload of evidence, followed by a clear overview of the transaction path they planned to investigate. Using multi-layer attribution they mapped the movement across several chains, highlighting where the funds likely entered mixing services. The visuals made it easier to follow than raw blockchain data ever could. They explained why some endpoints become unreachable and what factors influence that outcome, including timing and platform compliance. No recovery was possible in my situation, but the analysis removed uncertainty. The educational side added real value. We covered rug-pull indicators such as liquidity locks, team transparency, and smart contract audits — topics I wish I had known earlier. Practical advice included offline seed storage, multi-signature setups, and basic due diligence checklists. Communication remained consistent and jargon-free throughout. For anyone wanting to understand both the technical side of what happened and how to avoid repeats, the process provided exactly that. Cryptera Chain Signals Website: https://www.crypterachainsignals.com Email: info(a)crypterachainsignals.com

3 days, 12 hours

Cryptera Chain Signals User Account – Tracing Process And Key Learnings

by Yulie Morgan

After a phishing incident in late February 2026 I spent time researching options before contacting Cryptera Chain Signals. The intake process was straightforward — they asked for transaction hashes, wallet addresses, and a short timeline, nothing more sensitive. Within a few days they sent an initial graph showing how the funds had moved from my wallet through a bridge and into a mixer service. The multi-layer attribution explanation was particularly helpful. They walked me through how clustering works, why certain addresses grouped together, and how behavioral patterns (like repeated small transfers) can reveal control even after obfuscation. It was the first time I really understood how blockchain transparency operates in practice. Recovery was limited because the assets had already been dispersed, but the detailed report clarified every step and helped me close the chapter without lingering questions. What stayed with me was the education component. We discussed common phishing tactics, how fake interfaces mimic legitimate ones, and simple habits like bookmarking official sites and using hardware wallets. I also learned about monitoring tools that flag unusual activity before it escalates. The team answered questions patiently without any pressure. Overall it was a clear, educational process that turned a frustrating experience into practical knowledge I now apply daily. Cryptera Chain Signals Website: https://www.crypterachainsignals.com Email: info(a)crypterachainsignals.com

3 days, 12 hours

Cryptera Chain Signals Provides Overview Of Forensics Tools Used In Digital Asset Cases

by Yulie Morgan

Cryptera Chain Signals has outlined the types of specialized tools and methods employed in digital asset investigations. Operating for 28 years with over 426 completed projects and a 4.28 out of 5 rating from 2,467 client reviews, the firm relies on a combination of public blockchain data and proprietary multi-layer attribution techniques. Core tools include transaction graph visualization software that plots every transfer as interconnected nodes, making complex flows visible at a glance. Address clustering algorithms then group seemingly unrelated wallets that share behavioral traits such as similar transaction sizes or timing. These layers allow Cryptera Chain Signals to trace assets even after they pass through obfuscation services. Clients receive explanations of these tools in plain language. For instance, they learn how public ledgers function like an open database where every entry is permanent, yet interpreting that data requires experience in pattern recognition. The firm also discusses limitations — certain privacy-focused protocols or rapid cross-chain movements can reduce visibility, and no tool can access private keys or off-chain information. Education extends to everyday applications. Cryptera Chain Signals shows clients how to use free explorers for basic checks, why verifying contract addresses matters, and how to spot anomalies like sudden large withdrawals. Sessions cover wallet best practices and response protocols for suspected incidents. All work follows strict privacy protocols, beginning with minimal data collection and progressing only with client consent. Reports are designed to educate rather than overwhelm, helping users understand both the incident and broader blockchain principles. Cryptera Chain Signals Website: https://www.crypterachainsignals.com Email: info(a)crypterachainsignals.com

3 days, 12 hours

Cryptera Chain Signals Discusses The Importance Of Prompt Action In Blockchain Analysis

by Yulie Morgan

Cryptera Chain Signals continues to stress the value of timely engagement when cryptocurrency assets go missing. With 28 years of experience and more than 426 projects documented at a 4.28 out of 5 average client rating from 2,467 reviews, the firm sees clear patterns in cases where early analysis made a measurable difference. Blockchain data is permanent, but the ability to act on that data diminishes rapidly. Once funds move through additional layers — bridges, decentralized exchanges, or mixing services — the transaction graph becomes more complex. Cryptera Chain Signals multi-layer attribution process begins immediately upon receiving hashes and addresses, constructing visual maps that reveal clusters and potential endpoints. This rapid mapping can identify regulated platforms where intervention remains possible. The company educates clients on why speed matters. Many loss scenarios involve automated scripts that disperse assets within hours. Understanding basic mechanics, such as how gas fees can indicate rushed transfers or how address clustering reveals control, helps users appreciate the window of opportunity. Cryptera Chain Signals also explains common self-tracing mistakes that can inadvertently alert bad actors or scatter funds further. Educational components include guidance on immediate documentation (saving every communication and transaction detail) and basic security hygiene (hardware wallets, offline storage, verified connections). Clients learn to differentiate between recoverable situations and those limited by design, gaining clarity on realistic expectations without false optimism. The firm’s structured process — intake, analysis, reporting, and updates — keeps clients informed at every stage. This transparency helps individuals learn from the incident while understanding the broader blockchain environment. Cryptera Chain Signals Website: https://www.crypterachainsignals.com Email: info(a)crypterachainsignals.com

3 days, 12 hours

Cryptera Chain Signals Highlights Educational Initiatives For Scam Awareness In 2026

by Yulie Morgan

As reports of cryptocurrency-related incidents continue in 2026, Cryptera Chain Signals has expanded its focus on educational resources to help users better understand scam mechanics and protective measures. The firm, active since 1998 with more than 426 projects completed and a 4.28 out of 5 client rating from 2,467 reviews, integrates learning into every stage of its work. Common vectors discussed include phishing campaigns that use fake wallet interfaces or social media impersonation to capture credentials. Cryptera Chain Signals explains how these attacks often begin with seemingly legitimate messages and escalate to requests for seed phrases or private keys. Another area of emphasis is investment schemes where platforms promise high returns but lack proper smart contract audits or liquidity locks. The company teaches clients to check for red flags such as anonymous development teams, sudden changes in trading volume, or developers moving large portions of raised funds. Through multi-layer attribution, Cryptera Chain Signals shows clients how funds typically move after a successful scam — often toward mixers or offshore exchanges. Visual transaction graphs make these paths easier to follow, turning technical data into understandable narratives. Clients learn why acting within the first 48 hours can preserve more options, as funds become harder to locate once laundered. Preventive education covers wallet security fundamentals: keeping seed phrases offline, using hardware devices, enabling multi-factor authentication, and avoiding connections to unverified sites. The firm also discusses emerging risks such as deepfake videos used for impersonation and cross-chain bridge exploits, providing context on how these attacks function and how basic monitoring can help detect them early. Cryptera Chain Signals delivers this information through clear consultations and follow-up materials rather than overwhelming jargon. The goal is to equip individuals with knowledge that extends far beyond any single incident. Cryptera Chain Signals Website: https://www.crypterachainsignals.com Email: info(a)crypterachainsignals.com

3 days, 12 hours

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