ASR

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Revision as of 19:37, 14 August 2011 by Http (talk | contribs) (ASR Verify Disassembly: another cross-ref)
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Apple System Restore.

Application found on the Restore/Update Ramdisks. It writes the rootfs image to the actual system drive (ASR RESTORE), then checksums it. (ASR VERIFY)

ASR Verify Disassembly

__text:00014204 loc_14204                               ; CODE XREF: sub_13AB4+61E�j
__text:00014204                                         ; sub_13AB4+73E�j
__text:00014204                 LDR     R3, =(off_235E8 - 0x1420A)
__text:00014206                 ADD     R3, PC
__text:00014208                 LDR     R3, [R3]
__text:0001420A                 LDR     R3, [R3]
__text:0001420C                 CMP     R3, #0
__text:0001420E                 BEQ     loc_1427A
__text:00014210                 LDR     R0, =(aImagePassedSig - 0x14216)
__text:00014212                 ADD     R0, PC          ; "Image passed signature verification"
__text:00014214                 BLX     _warnx
__text:00014218                 B       loc_1427A
__text:0001421A ; ---------------------------------------------------------------------------
__text:0001421A
__text:0001421A loc_1421A                               ; CODE XREF: sub_13AB4+622�j
__text:0001421A                                         ; sub_13AB4+628�j ...
__text:0001421A                 LDR.W   R0, =(aImageFailedSig - 0x14222)
__text:0001421E                 ADD     R0, PC          ; "Image failed signature verification"
__text:00014220                 BLX     _warnx
__text:00014224                 MOVS    R2, #0x50
__text:00014226                 B       loc_1426E
__text:00014228 ; ---------------------------------------------------------------------------

See also the patch mentioned here: Preventing_Baseband_Update#asr and here: Making_PwnageTool_Bundles#ASR.

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