| 1 | //! Tolerated-diff proof points for the parity harness. |
| 2 | |
| 3 | mod common; |
| 4 | |
| 5 | use common::harness::diff_macho; |
| 6 | |
| 7 | const MH_MAGIC_64: u32 = 0xFEEDFACF; |
| 8 | const CPU_TYPE_ARM64: u32 = 0x0100_000C; |
| 9 | const MH_EXECUTE: u32 = 2; |
| 10 | const LC_ID_DYLIB: u32 = 0x0D; |
| 11 | const LC_UUID: u32 = 0x1B; |
| 12 | const LC_CODE_SIGNATURE: u32 = 0x1D; |
| 13 | |
| 14 | #[test] |
| 15 | fn differing_uuid_bytes_are_tolerated() { |
| 16 | let ours = synth_uuid_image([0x11; 16]); |
| 17 | let theirs = synth_uuid_image([0x22; 16]); |
| 18 | let report = diff_macho(&ours, &theirs); |
| 19 | assert!( |
| 20 | report.is_clean(), |
| 21 | "UUID-only diff should be tolerated: {report:#?}" |
| 22 | ); |
| 23 | assert_eq!(report.tolerated.len(), 1); |
| 24 | } |
| 25 | |
| 26 | #[test] |
| 27 | fn differing_code_signature_blob_bytes_are_tolerated() { |
| 28 | let ours = synth_code_signature_image([0xAA; 8]); |
| 29 | let theirs = synth_code_signature_image([0xBB; 8]); |
| 30 | let report = diff_macho(&ours, &theirs); |
| 31 | assert!( |
| 32 | report.is_clean(), |
| 33 | "code-signature-only diff should be tolerated: {report:#?}" |
| 34 | ); |
| 35 | assert_eq!(report.tolerated.len(), 1); |
| 36 | } |
| 37 | |
| 38 | #[test] |
| 39 | fn differing_dylib_timestamps_are_tolerated() { |
| 40 | let ours = synth_dylib_image(2); |
| 41 | let theirs = synth_dylib_image(7); |
| 42 | let report = diff_macho(&ours, &theirs); |
| 43 | assert!( |
| 44 | report.is_clean(), |
| 45 | "dylib timestamp-only diff should be tolerated: {report:#?}" |
| 46 | ); |
| 47 | assert_eq!(report.tolerated.len(), 1); |
| 48 | } |
| 49 | |
| 50 | fn synth_uuid_image(uuid: [u8; 16]) -> Vec<u8> { |
| 51 | let mut out = Vec::new(); |
| 52 | push_header(&mut out, 1, 24); |
| 53 | out.extend_from_slice(&LC_UUID.to_le_bytes()); |
| 54 | out.extend_from_slice(&24u32.to_le_bytes()); |
| 55 | out.extend_from_slice(&uuid); |
| 56 | out |
| 57 | } |
| 58 | |
| 59 | fn synth_code_signature_image(blob: [u8; 8]) -> Vec<u8> { |
| 60 | let mut out = Vec::new(); |
| 61 | let dataoff = 0x40u32; |
| 62 | let datasize = blob.len() as u32; |
| 63 | push_header(&mut out, 1, 16); |
| 64 | out.extend_from_slice(&LC_CODE_SIGNATURE.to_le_bytes()); |
| 65 | out.extend_from_slice(&16u32.to_le_bytes()); |
| 66 | out.extend_from_slice(&dataoff.to_le_bytes()); |
| 67 | out.extend_from_slice(&datasize.to_le_bytes()); |
| 68 | out.resize(dataoff as usize, 0); |
| 69 | out.extend_from_slice(&blob); |
| 70 | out |
| 71 | } |
| 72 | |
| 73 | fn synth_dylib_image(timestamp: u32) -> Vec<u8> { |
| 74 | let mut out = Vec::new(); |
| 75 | let cmdsize = 32u32; |
| 76 | push_header(&mut out, 1, cmdsize); |
| 77 | out.extend_from_slice(&LC_ID_DYLIB.to_le_bytes()); |
| 78 | out.extend_from_slice(&cmdsize.to_le_bytes()); |
| 79 | out.extend_from_slice(&24u32.to_le_bytes()); |
| 80 | out.extend_from_slice(×tamp.to_le_bytes()); |
| 81 | out.extend_from_slice(&0u32.to_le_bytes()); |
| 82 | out.extend_from_slice(&0u32.to_le_bytes()); |
| 83 | out.extend_from_slice(b"x\0\0\0\0\0\0\0"); |
| 84 | out |
| 85 | } |
| 86 | |
| 87 | fn push_header(out: &mut Vec<u8>, ncmds: u32, sizeofcmds: u32) { |
| 88 | out.extend_from_slice(&MH_MAGIC_64.to_le_bytes()); |
| 89 | out.extend_from_slice(&CPU_TYPE_ARM64.to_le_bytes()); |
| 90 | out.extend_from_slice(&0u32.to_le_bytes()); |
| 91 | out.extend_from_slice(&MH_EXECUTE.to_le_bytes()); |
| 92 | out.extend_from_slice(&ncmds.to_le_bytes()); |
| 93 | out.extend_from_slice(&sizeofcmds.to_le_bytes()); |
| 94 | out.extend_from_slice(&0u32.to_le_bytes()); |
| 95 | out.extend_from_slice(&0u32.to_le_bytes()); |
| 96 | } |
| 97 |