macho/load_commands: support new macOS 15 dylib use command #625
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Cursed, thank you Apple 🤦. Reviewing now! |
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If you'd like an example binary, I can send you some |
lib/macho/load_commands.rb
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| # @return [Integer] the library's compatibility version number | ||
| field :compatibility_version, :uint32 | ||
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| def self.new_from_bin(view) |
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Minor: it'd be nice to have a comment here explaining why we override new_from_bin -- just a summary of what you put in the PR desc would be great 🙂
Yes please! Checking them in with the other test assets would be IMO ideal. |
| }.freeze | ||
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| # the marker used to denote a newer style dylib use command. | ||
| # the value is the timestamp 24 January 1984 18:12:16 |
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Funny choice -- that's the day the Macintosh was released.
I've checked one in. Not actually linked into any test yet but it's there. Would you like a test prior to merging and releasing? Not poked around the tests here yet but can have a look and see which one might fit it best. |
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Actually didn't see the Makefile - let me fix that. |
No test before merge necessary, but before release would be ideal -- happy to review in a follow-up if you'd like to get this in first. |
Bo98
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Did some tests - let me know if you think I've missed anything. |
| :LC_PREPAGE => "LoadCommand", | ||
| :LC_DYSYMTAB => "DysymtabCommand", | ||
| :LC_LOAD_DYLIB => "DylibCommand", | ||
| :LC_LOAD_DYLIB => "DylibUseCommand", |
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Did this and moved the new_from_bin hack to there to be slightly more strict where this applies - it should not apply to LC_ID_DYLIB etc.
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@Bo98 LMK when you want a release -- I can do one whenever. |
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A new release now would be great so I can use this in Homebrew/brew and get a release out for that too. |
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Released with 4.1.0! |
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Thank you! |
macOS 15 adds a new
flagsfield at the end of the load command. The presence of this is checked indyldby comparing thetimestampandnameoff:https://github.com/apple-oss-distributions/dyld/blob/d552c40cd1de105f0ec95008e0e0c0972de43456/mach_o/Header.cpp#L1175
This requires a bit of a hack in
new_from_binto basically load the old command, check it and then load the new command instead if conditions match.