[PATCH v2 0/5] gpu: nova-core: use checked arithmetic for firmware parsing robustness

[Joel Fernandes]

Changes from v1 to v2:
- Added Reviewed-by tags from Zhi
- Fixed comment formatting nits raised by Dirk/Zhi

This series adds checked arithmetic throughout nova-core's firmware parsing
code to guard rust code against integer overflow from corrupt firmware.

Without checked arithmetic, firmware could cause integer overflow when
computing offsets. The danger is not just wrapping to a huge value (which may
fail validation in other paths), but potentially wrapping to a small plausible
offset that accesses entirely wrong data, causing silent corruption or security
issues.

This series has been rebased on drm-rust-next. If possible, I would like us to
consider merging for the upcoming merge window to avoid future conflicts.
Tested probing with GPU name printed in dmesg on my GA102 (Ampere).

The git tree with all patches can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git (tag: nova-checked-arith-v2-20260126)

Link to v1: https://lore.kernel.org/all/20260124231830.3088323-1-joelagnelf@nvidia.com/

Joel Fernandes (5):
  gpu: nova-core: use checked arithmetic in FWSEC firmware parsing
  gpu: nova-core: use checked arithmetic in Booter signature parsing
  gpu: nova-core: use checked arithmetic in frombytes_at helper
  gpu: nova-core: use checked arithmetic in BinFirmware::data
  gpu: nova-core: use checked arithmetic in RISC-V firmware parsing

 drivers/gpu/nova-core/firmware.rs        |  3 +-
 drivers/gpu/nova-core/firmware/booter.rs | 22 ++++++---
 drivers/gpu/nova-core/firmware/fwsec.rs  | 60 ++++++++++++++----------
 drivers/gpu/nova-core/firmware/riscv.rs  |  6 ++-
 4 files changed, 57 insertions(+), 34 deletions(-)


base-commit: cea7b66a80412e2a5b74627b89ae25f1d0110a4b
--
2.34.1