Fiddle::Pointer#[]= copies beyond the source pointer size
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- Dominant language
- Ruby
- Stars
- 195
- Forks
- 53
- Avg merge
- 23h 57m
- Merged PRs (30d)
- 1
Description
require "fiddle"
include Fiddle
dst = Pointer.malloc(32, RUBY_FREE)
src = Pointer.malloc(4, RUBY_FREE)
dst[0, 32] = "\x00" * 32
src[0, 4] = "\xAA\xBB\xCC\xDD"
# src is only 4 bytes, but 16 bytes are copied.
dst[0, 16] = src
puts dst.to_str(32)
.bytes
.first(16)
.map { |b| "%02x" % b }
.join(" ")
# aa bb cc dd ad 78 00 00 d8 2a a1 98 ad 78 00 00
# (In my environment)
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running the Ruby reproduction in the issue and inspect the implementation of Fiddle::Pointer#[]= to trace how a source Pointer is copied. Add regression coverage for a source pointer smaller than the requested destination range, then verify that bytes beyond the source pointer are not copied.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- ruby
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 52/100