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Redsn0w Lite
Revision as of 13:31, 8 February 2009 by ChronicDev (talk | contribs) (RedSn0w moved to Redsn0w: too annoying to reference with the caps everytime, as well as the fact that people that are going to try to reference it ay have trouble)
This is the iPhone Dev Team's tethered jailbreak ("redsn0w-lite") for the iPod Touch 2G. It is their payload for the ARM7 Go backdoor. It's analagous to how yellowsn0w is the actual unlocking payload injected by the at+stkprof exploit in baseband 02.28.00.
Contents
What it does
For the most part, it is a nicely optimized payload that does the same patches as 0wnboot, being the signature check patch and the range check patch.
Disassm
ROM:00000000 LDR R3, =0xA1F10F ; flipped: ROM:00000000 ; 0x0FF1A100 ROM:00000004 MOV R2, #0x2000 ROM:00000008 STRH R2, [R3,#0x34] ; patch the NEGS R0, R0 to MOVS R0, #0 at 0x0FF1A134 ROM:00000008 ; this is usually the part of the sigcheck routine that ROM:00000008 ; would be jumped to if there was an error, so this ROM:00000008 ; just pretty much makes it return 0, saying everything ROM:00000008 ; went OK, versus -1, saying there was an error ROM:0000000C LDR R3, =0xFFAFF20F ; flipped: ROM:0000000C ; 0x0FF2AFFF ROM:00000010 MOVL R2, 0xFFFFFFFF ROM:00000014 STR R2, [R3,#-0x23F] ; patch flags to 0xffffffff at addr 0xFF2ADC0 ROM:00000014 ; this patches the iboot flags to allow no range check, ROM:00000014 ; no permission check for restricted commands, aes gid ROM:00000014 ; and uid key are not restricted by devtree at boot so ROM:00000014 ; you can decrypt kbags with xpwn crypto bundle with ROM:00000014 ; no devtree patch needed, and more. basically tricks ROM:00000014 ; your device into thinking it is an engineering device ROM:00000018 ROM:00000018 spin ; CODE XREF: ROM:spin�j ROM:00000018 B spin ROM:00000018 ; --------------------------------------------------------------------------- ROM:0000001C dword_1C DCD 0xA1F10F ; DATA XREF: ROM:00000000�r ROM:0000001C ; flipped: ROM:0000001C ; 0x0FF1A100 ROM:00000020 dword_20 DCD 0xFFAFF20F ; DATA XREF: ROM:0000000C�r ROM:00000020 ; ROM ends ; flipped: ROM:00000020 ; 0x0FF2AFFF
Source
#define A_CHECK_SIGN 0x0FF1A134 // sigcheck loc
#define A_CHECK_PERM 0xFF2ADC0 // ib flags loc
void redsn0w(void) {
*(vu16 *)A_CHECK_SIGN = 0x2000; // pwnage
*(vu32 *)A_CHECK_PERM = 0xffffffff; // permissions
while(1);
}
