[PATCH v2 0/6] Fix input validation issues in SBI ecall handlers

[liutong]

This series fixes input validation and shared memory handling issues
found across multiple SBI extension handlers: DBTR, PMU, SSE, and MPXY.

The fixes fall into three categories:

1. Integer overflow in bounds checks (patches 1, 4, 6)
   Arithmetic overflow in endpoint calculations allows out-of-bounds
   access from S-mode via crafted ecall parameters.

2. TOCTOU / double-fetch from shared memory (patches 2, 5)
   S-mode shared memory is read twice --once to validate, once to apply.
   S-mode can modify the memory between reads, bypassing M-mode
   validation.

3. Insufficient address range validation (patch 3)
   Single-address domain check does not cover the full shared memory
   region, allowing cross-domain access.

These patches were previously sent individually. Per reviewer feedback,
they are now consolidated into a single series.

Changes in v2:
- Reorganized as a unified patch series (per Rahul Pathak's suggestion)
- All patches now include Fixes tags
- install_trig: fixed rollback to also cover SBI_ERR_NOT_SUPPORTED path

liutong (6):
  lib: sbi_dbtr: fix integer overflow in read_trig bounds check
  lib: sbi_dbtr: fix shared memory double-fetch in install_trig
  lib: sbi_dbtr: use range check for shared memory domain validation
  lib: sbi_pmu: fix integer overflow and zero-address in event_get_info
  lib: sbi_sse: fix shared memory double-fetch in sse_write_attrs
  lib: sbi_mpxy: fix integer overflow in attribute range endpoint

 lib/sbi/sbi_dbtr.c | 91 +++++++++++++++++++++++-----------------------
 lib/sbi/sbi_mpxy.c |  6 ++-
 lib/sbi/sbi_pmu.c  | 10 ++++-
 lib/sbi/sbi_sse.c  | 14 ++++---
 4 files changed, 66 insertions(+), 55 deletions(-)

-- 
2.34.1