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Parse LC_DYLD_CHAINED_FIXUPS and LC_DYLD_EXPORTS_TRIE in the macho module #301

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PetoStr opened this issue Feb 5, 2025 · 4 comments · Fixed by #305
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Parse LC_DYLD_CHAINED_FIXUPS and LC_DYLD_EXPORTS_TRIE in the macho module #301

PetoStr opened this issue Feb 5, 2025 · 4 comments · Fixed by #305

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@PetoStr
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PetoStr commented Feb 5, 2025

Currently, yara-x retrieves the imports and exports of a Mach-O binary only by parsing the LC_DYLD_INFO_ONLY and LC_DYLD_INFO commands. However, the Mach-O binary may contain newer commands, LC_DYLD_CHAINED_FIXUPS and LC_DYLD_EXPORTS_TRIE, instead of the former two.

For example, the binary with SHA-256 3c7879d0b6419b39f9a3ea6372576c25152d9bbc9edafe4953e3eb8ee3a89bad has these commands, but a rule containing macho.has_export("_MsoABTerm") will never match on it despite having the export.

More info: https://github.com/qyang-nj/llios/blob/main/dynamic_linking/chained_fixups.md
@plusvic
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plusvic commented Feb 5, 2025

@latonis FYI, in case you have bandwith for taking at look at this.

@latonis
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latonis commented Feb 5, 2025

will take a look today :)

@latonis latonis mentioned this issue Feb 5, 2025
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@latonis
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latonis commented Feb 5, 2025

#303 parses the exports_trie load command 😄

@latonis
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latonis commented Feb 5, 2025 •
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Working on the imports, needs a bit of a rework

#305 parses the fixups

plusvic pushed a commit that referenced this issue Feb 6, 2025
@latonis
feat: implement parsing for LC_DYLD_EXPORTS_TRIE for mach-o (#303)
29d5700 
Implements the parsing required for exports defined via `LC_DYLD_EXPORTS_TRIE` as described in #301.
@latonis latonis mentioned this issue Feb 8, 2025
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feat: implement parsing for chained fixup imports via LC_DYLD_CHAINED_FIXUPS latonis/yara-x
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@plusvic @latonis @PetoStr