anchao opened a new pull request, #21062:
URL: https://github.com/apache/nuttx/pull/21062
## Summary
Fix interrupted file I/O handling in `rammap()` and `msync_rammap()`.
When `file_read()` or `file_write()` returned `-EINTR`, the code treated the
operation as retryable but still advanced the data buffer and reduced the
remaining length afterwards.
Since `-EINTR` is negative, this could move the buffer pointer backwards and
increase the remaining length, potentially causing incorrect retries, an
infinite loop, or out-of-bounds memory access.
## Changes
- Retry interrupted `file_write()` calls in `msync_rammap()` without
updating
the write buffer or remaining length.
- Retry interrupted `file_read()` calls in `rammap()` without updating the
read
buffer or remaining length.
- Keep existing behavior for non-`EINTR` read/write errors.
## Testing
sim/nsh
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