Fix section type identifing in mach-o view #7842
Open
+10
−8
Conversation
This file contains hidden or 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
Based on opensource code [`loader.h`](https://github.com/apple-oss-distributions/xnu/blob/f6217f891ac0bb64f3d375211650a4c1ff8ca1ea/EXTERNAL_HEADERS/mach-o/loader.h#L470) and [`dyld`](https://github.com/apple-oss-distributions/dyld), the lowest byte in `sect.flags` stands for section type. | section name | section type | value | | :---------------------: | :------------------------: | :---: | | `__auth_got` or `__got` | S_NON_LAZY_SYMBOL_POINTERS | 0x6 | | `__init_offsets` | S_INIT_FUNC_OFFSETS | 0x16 | The problem for `sect.flags & S_NON_LAZY_SYMBOL_POINTERS` is that if `flags` is `S_INIT_FUNC_OFFSETS`, mach-o view will confuse `__init_offsets` with `__auth_got`(or `__got`). The checks for other section types have also been improved.
|
|
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
2 participants
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Outdated suggestions cannot be applied.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.
The patch is only tested on 5.2.8614.
Based on opensource code
loader.handdyld, the lowest byte insect.flagsstands for section type.__auth_gotor__got__init_offsetsThe problem for
sect.flags & S_NON_LAZY_SYMBOL_POINTERSis that ifflagsisS_INIT_FUNC_OFFSETS, mach-o view will confuse__init_offsetswith__auth_got(or__got). The checks for other section types have also been improved.