fix heap corruption on LP64 platforms #90
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
|
Converted to draft, because |
Mixing unsigned long and int on LP64 platforms caused the chunksize adjustment to be wrong for flash memory reads from "negative" addresses. This caused runaway reads and heap corruption, because chunksize was being adjusted to be greater than numBytes. Simplify the computation by computing the offset within the page using a mask, and use the difference between pageSize and offset to limit chunksize. This is less necessary after the qXfer:memory-map:read support was added, but it's definitely needed in 2.13, and maybe some older GDB versions don't support qXfer:memory-map:read.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Mixing unsigned long and int on LP64 platforms caused the chunksize adjustment to be wrong for flash memory reads from "negative" addresses. This caused runaway reads and heap corruption, because chunksize was being adjusted to be greater than numBytes. Simplify the computation by computing the offset within the page using a mask, and use the difference between pageSize and offset to limit chunksize.
This is less necessary after the qXfer:memory-map:read support was added, but it's definitely needed in 2.13, and maybe some older GDB versions don't support qXfer:memory-map:read.
Fixes #107.