Gururaj Saileshwar

Research Areas - Computer Architecture and Security.
Assistant Professor, Department of Computer Science,
Electrical and Computer Engineering (by courtesy),
University of Toronto

Email: gururaj@cs.toronto.edu

I am looking for motivated PhD students to join my group at the University of Toronto. If you find security exciting, please reach out and apply to the UofT CS/ECE graduate programs.

My research focuses on security for computing hardware and systems. My research interests include microarchitectural security (cache side-channels, transient execution attacks, Rowhammer attacks), system security (memory safety and fuzzing) and security for machine learning systems (LLM side channels, GPU Confidential Computing).

My work has been awarded a CSAW Best Paper Award, an IEEE Top Pick in Hardware and Embedded Security, HPCA Best Paper Award, IEEE HOST Best PhD Dissertation Award, ACM SIGARCH / IEEE TCCA Outstanding Dissertation Award (Honorable Mention), ACM SIGMICRO Dissertation Award (Honorable Mention), and an IEEE MICRO Top Picks (Honorable Mention). My PhD was partly supported by a GT Cybersecurity Fellowship and a GT Bourne Fellowship.

I received my PhD at Georgia Tech, Atlanta, USA, where I was advised by Prof. Moinuddin Qureshi. I received my B.Tech and M.Tech at Indian Institute of Technology - Bombay, India. Prior to UofT, I was with NVIDIA Research.

news (full list)

Jan, 2026 Congratulations to Joyce Qu on receiving the CRA Outstanding Undergraduate Researcher Award (Honorable Mention).
Nov, 2025 Our SEC'25 paper, GPUHammer, won the 2025 CSAW Best Paper Award (North America) in Technical Impact!
Jul, 2025 Our SEC'25 paper on Rowhammer Attacks on NVIDIA GPUs is public! Check it out at www.gpuhammer.com!
Mar, 2025 QPRAC (HPCA 2025) is awarded the Distinguished Artifact Award!
Feb, 2025 Our work, MIRAGE (Usenix Security 2021) is awarded a Top Pick in Hardware and Embedded Security!
Feb, 2025 Our work, AMuLeT that tests Spectre countermeasures for leaks at design time is accepted at ASPLOS 2025!
Feb, 2025 Our work, QPRAC, a new attack and defense for PRAC-based Rowhammer mitigations is accepted at HPCA 2025!
Jun, 2024 Our work, PrIDE, the first secure and low cost in-DRAM mitigation against Rowhammer attacks is presented at ISCA'24.
Aug, 2023 Our CAL-2023 paper Mirage of breaking MIRAGE highlights modeling pitfalls in recent “attacks”, and shows MIRAGE is still unbroken!
Aug, 2023 Serving as a Workshop & Tutorial Chair at MICRO 2023!
Jun, 2023 Awarded the ACM SIGARCH/IEEE CS TCCA Outstanding Dissertation Award (Honorable Mention) at ISCA'23!
Feb, 2023 Our paper Scalable and Secure Row-Swap at HPCA-2023 received the Best Paper Award!
Sep, 2022 Serving as Co-Chair of the Artifact Evaluation Committee at ASPLOS 2023.
Aug, 2022 SQUIP attack (CVE-2021-46778), discovered with collaborators at TU Graz, is public. (techradar, toms hardware, hacker news, ...)
Jun, 2022 Awarded the Best PhD Dissertation Award at IEEE HOST 2022.
Mar, 2022 Invited to serve on the Program Committee (PC) for RAID 2022.
Nov, 2021 Our paper Randomized Row Swap, a principled Rowhammer mitigation accepted at ASPLOS 2022!
Oct, 2021 Invited to serve on the External Review Committee (ERC) for ISCA 2022.
May, 2021 Our paper on Mentoring in Computer Architecture is presented in WCAE at ISCA 2021.
May, 2021 Finalist in the Qualcomm Innovation Fellowship 2021!
Mar, 2021 Invited to serve on the Program Committee (PC) for IEEE S&P (Oakland) 2022.
Mar, 2021 Hardware Support for Fuzzing accepted at CCS 2021!
Mar, 2021 Recognized as Distinguished Reviewer in the Shadow PC of IEEE S&P (Oakland) 2021.
Feb, 2021 MIRAGE, a principled defense vs cache attacks accepted at USENIX Security 2021 [Github].
Jan, 2021 Streamline, the fastest cache covert-channel attack accepted at ASPLOS 2021 [Github].
Jan, 2021 Awarded Georgia Tech IISP Cybersecurity Fellowship!
Nov, 2020 Invited to present MIRAGE at IBM Research's Future of Comp-Arch Workshop 2020.
Apr, 2020 Selected to participate in the 8th Heidelberg Laureate Forum 2020.
Sep, 2019 Invited to present CleanupSpec at IBM Research's Future of Comp-Arch Workshop 2019.
Aug, 2019 CleanupSpec, our work on safe speculation is accepted at MICRO 2019 [Github].
May, 2019 Finalist in Qualcomm Innovation Fellowship 2019!
Jan, 2019 Our paper SYNERGY is awarded an Honorable Mention at IEEE MICRO's Top Picks 2019!
Dec, 2018 Finalist in Microsoft Research PhD Fellowship 2019!
Aug, 2018 Morphable Counters, our work on in-DRAM Merkle Trees is accepted at MICRO 2018 [Github].
Nov, 2017 SYNERGY, our work on co-designing DRAM integrity and reliability accepted at HPCA 2018!

teaching

  • CSC2231 - Topics in Computer Systems: Secure Computer Systems and Hardware (course outline)
    • Fall 2024
    • Fall 2023
  • CSC427 - Computer Security
    • Winter 2025
    • Winter 2024

recent publications (full list)

  1. SEC
    GPUHammer: Rowhammer Attacks on GPU Memories are Practical
    Chris (Shaopeng) Lin*, Joyce Qu*, and Gururaj Saileshwar
    In 34th USENIX Security Symposium (USENIX Security) 2025
    CSAW’25 (North America) Best Paper Award
    HTML PDF Code
  2. SEC
    Relocate-Vote: Using Sparsity Information to Exploit Ciphertext Side-Channels
    Yuqin Yan, Wei Huang, Ilya Grishchenko, Gururaj Saileshwar, Aastha Mehta, and David Lie
    In 34th USENIX Security Symposium (USENIX Security) 2025
    HTML PDF Slides Code
  3. ISCA
    When Mitigations Backfire: Timing Channel Attacks and Defense for PRAC-Based Rowhammer Mitigations
    Jeonghyun Woo, Joyce Qu, Gururaj Saileshwar, and Prashant Nair
    In 52nd International Symposium on Computer Architecture (ISCA) 2025
    HTML PDF Slides Code
  4. PETS
    Teaching an Old Dog New Tricks: Verifiable FHE Using Commodity Hardware
    Jules Drean, Fisher Jepsen, Edward Suh, Srini Devadas, Aamer Jaleel, and Gururaj Saileshwar
    In Proceedings on Privacy Enhancing Technologies (PETS) 2025
    PETS’25 Best Student Paper Award (Runner-Up)
    HTML PDF
  5. ASPLOS
    AMuLeT: Automated Design-Time Testing of Secure Speculation Countermeasures
    Bo Fu*, Leo Tenenbaum*, David Adler, Assaf Klein, Arpit Gogia, Alaa R. Alameldeen, Marco Guarnieri, Mark Silberstein, Oleksii Oleksenko, and Gururaj Saileshwar
    In 30th ACM International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS) 2025
    HTML PDF Slides Code
  6. HPCA
    QPRAC: Towards Secure and Practical PRAC-based Rowhammer Mitigation using Priority Queues
    Jeonghyun Woo, Shaopeng (Chris) Lin, Prashant J Nair, Aamer Jaleel, and Gururaj Saileshwar
    In 31st IEEE International Symposium on High Performance Computer Architecture (HPCA) 2025
    HPCA’25 Distinguished Artifact Award
    PDF Code
  7. ISCA
    PrIDE: Achieving Secure Rowhammer Mitigation with Low-Cost In-DRAM Trackers
    Aamer Jaleel, Gururaj Saileshwar, Steven Keckler, and Moinuddin Qureshi
    In 51st International Symposium on Computer Architecture (ISCA) 2024
    PDF Code
  8. DSN
    PT-Guard: Integrity-Protected Page Tables to Defend Against Breakthrough Rowhammer Attacks
    Anish Saxena, Gururaj Saileshwar, Jonas Juffinger, Andreas Kogler, Daniel Gruss, and Moinuddin Qureshi
    In 53rd Annual IEEE/IFIP International Conference on Dependable Systems and Networks (DSN) 2023
    HTML PDF Slides
  9. S&P
    Practical Timing Side-Channel Attacks on Memory Compression
    Martin Schwarzl, Pietro Borrello, Gururaj Saileshwar, Hanna Müller, Michael Schwarz, and Daniel Gruss
    In 44th IEEE Symposium on Security and Privacy (S&P) 2023
    HTML PDF Code
  10. S&P
    SQUIP: Exploiting the Scheduler Queue Contention Side Channel
    Stefan Gast, Jonas Juffinger, Martin Schwarzl, Gururaj Saileshwar, Andreas Kogler, Simone Franza, Markus Kostl, and Daniel Gruss
    In 44th IEEE Symposium on Security and Privacy (S&P) 2023
    HTML PDF Slides
  11. HPCA
    Scalable and Secure Row-Swap: Efficient and Safe Row Hammer Mitigation in Memory Systems
    Jeonghyun Woo, Gururaj Saileshwar, and Prashant J Nair
    In 29th IEEE International Symposium on High Performance Computer Architecture (HPCA) 2023
    HPCA’23 Best Paper Award
    HTML PDF Slides Code