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Cannot Find Bounds Of Current Function Code Blocks

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up vote 3 down vote favorite 1 I want to exploit a stack based buffer overflow for education purposes.There is a typical function called with a parameter from main which is Cheers sam Mar 23 '08 #1 Post Reply Share this Question 2 Replies P: n/a Andrey Tarasevich sa*********@gmail.com wrote: I am having 3 functions.When I step through when func b returns In Doctor Strange what was the title of the book Stan Lee was reading in his cameo? share|improve this answer answered Jan 6 '12 at 17:20 Tom Leek 128k16244375 1 +1 pretty good, I think its the nx bit because it crashes when he hits the nop have a peek at this web-site

If he has 4-byte ints (probably true), that's 128KiB of stack, which he might not have (the default stack size in my shell is 8KiB). He is able to make the jump so its not a canary and aslr is pretty obvious when you trying to determine a good return address. –rook Jan 6 '12 at I'm not saying there's no way to bypass it, but it takes more effort and a good understanding of its protection mechanism. PC: 0x402670 (gdb) file /opt/j64-602/bin/jconsole Reading symbols from /opt/j64-602/bin/jconsole...done. (no debugging symbols found)...done. (gdb) layout asm (gdb) start (gdb) share|improve this answer edited Mar 11 '10 at 2:12 answered Mar 11

Cannot Find Bounds Of Current Function Code Blocks

This requires looking up the return address in the debugger’s knowledge about where the functions are. No copy anymore. The result is that the code "returns" to some unpredictable location and can't figure out where it is it returned to.

Start a coup online without the government intervening Do Morpheus and his crew kill potential Ones? I use win7 32bit home basic edition. Logged Martin_fr Administrator Hero Member Posts: 4054 Re: Cannot find bounds of current function error « Reply #14 on: January 30, 2014, 09:46:30 pm » Zip it and upload it here.Or Gdb Set Breakpoint Jeremy -- Tel: +44 (1590) 610184 Cell: +44 (7970) 676050 SkypeID: jeremybennett Email: [email protected] Web: www.embecosm.com 1/1 © copyright 1999-2016 OpenCores.org, equivalent to ORSoC AB, all rights reserved.

What should I do next? Gdb Single Step Assembly for (i = 0; i < ASIZE; i++) { See @Emmet answer for indexing of -1 concern. How can I declare independence from the United States and start my own micro nation? Is it in the window that appears after we right-click the shortcut and click properties?

This windows appeared: http://postimg.org/image/uaf7fnfbf/ Can anyone help me with this problem? Gdb Cheat Sheet Why? Ballpark salary equivalent today of "healthcare benefits" in the US? gdb works fine on the kernel executable itself. (For those who really want to know, I'm inserting code at runtime into Linux kernel data space inside a VMware VM and debugging

Gdb Single Step Assembly

SMF 2.0.12 | SMF © 2016, Simple Machines XHTML RSS WAP2 This is the mail archive of the [email protected] mailing list for the GDB project. It overwrites the current stack frame of your function with irrelevant data, and destroys the return address in the process, which is normally stored there among other things. Cannot Find Bounds Of Current Function Code Blocks Press C-x s to enter SingleKey mode, where run continue up down finish etc. Gdb Disassemble I suppose another alternative would be to produce a fake kernel module or debug info file to give to gdb, to cause it to believe this area is within the program

Turn on all compiler warnings and you might catch a few errors. #include #include /* Avoid magic numbers */ #define ARRAY_SIZE (16384) #define RAND_CEILING (17000) int main(void) { int Check This Out Instead you have a different address (one pointing to your shellcode if your exploit has worked). Logged Martin_fr Administrator Hero Member Posts: 4054 Re: Cannot find bounds of current function error « Reply #8 on: January 28, 2014, 06:16:41 pm » Quote from: KMagic on January 28, Maybe in theory you could synthesize some DWARF data around the current stack address, and load that into gdb, but I've no idea how. –Steve Jessop Jan 5 '12 at 12:01 Gdb Print Stack

When the debugger tries to figure out which function this address is in, it fails, because the address is not in any of the functions in your program. My cat sat down on my laptop, now the right side of my keyboard types the wrong characters What are Fluffy Blocks? So, I've taken a try with FSF gdb 7.6 as per http://sourceware.org/gdb/wiki/BuildingOnDarwin, but I experience the impossibility to go step by step. Source Teenage daughter refusing to go to school Web Sites: Disneyland vs Disney World in the United States Is adding the ‘tbl’ prefix to table names really a problem?

I thought you were asking why you need to compile with no-stack-protector, and answered. –ugoren Jan 5 '12 at 17:39 There is no other way as far as i Gdb Commands For number 4, I don't know where the command line is. Given an input such that nops+shellcode+address_shellcode, I will exploit it.

By looking at the EIP at the time of the crash and the data on the stack you can see if it made the jmp to your nop sled or not,

I attach the source code.I can not reproduce the bug, step into works fine.(I'm using PCX mingw 4.6.3 and gdb CVS head build myself) Logged If some piece of memory should Home Help Search Login Register Wiki Code::Blocks » User forums » General (but related to Code::Blocks) » Cannot find bounds of current function? « previous next » Send this topic Print Hence it is no wonder that gdb cannot find where the "function" he jumped in is supposed to begin or end. So, what to do ?

Your "shell code", when in RAM (in the stack), is not in a part which is mapped from the executable file (it is in the stack, instead) and, anyway, was not This tells gdb to disassemble the current instruction just before printing the prompt each time; then you can just keep hitting Enter to repeat the stepi command. (See my answer to Why is (a % 256) different than (a & 0xFF)? http://pgexch.com/cannot-find/cygwin-gcc-cannot-find.html It is also a quite atypical piece of code, with no prologue (the prologue is about preparing the stack so that argument can be retrieved, and the stack cleaned upon exit)

The result is that the code "returns" to some unpredictable location and can't figure out where it is it returned to. This is what causes the error message. share|improve this answer answered Apr 3 '14 at 13:21 Carl Martin 26 When I used array indexing with a size of 16384, the program started freezing a lot, even I wouldn't mind a simple way to use a loader to load my object code to a relocated address, but bear in mind the loading has to be done in a

Logged huzhongshan Multiple posting newcomer Posts: 109 Re: Cannot find bounds of current function? « Reply #10 on: March 31, 2013, 11:58:45 am » I solved the problem.I reinstalled the windows. by kolbjoern [November 08, 2016, 09:51:23 pm] SMF 2.0.12 | SMF © 2016, Simple MachinesTinyPortal © 2005-2011 XHTML RSS WAP2 418,782 Members | 1,063 Online Join Now login Ask Does my electronic parking brake remain engaged if I disconnect the battery? What would be the consequences of a world that has only one dominant species of non-oceanic animal life?

So it shows the address and "??" You have to compile with -no-stack-protector, because stack-protector protects you from exactly what you're trying to do. YA novel involving immortality via drowning Product catalog Why is the reduction by sugars more efficient in basic solutions than in acidic ones? The cost of switching to electric cars? How can I declare independence from the United States and start my own micro nation?

more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed by vrull [November 08, 2016, 11:43:46 pm] lazarus application init by J-G [November 08, 2016, 11:13:04 pm] Online Package Manager by GetMem [November 08, 2016, 11:12:18 pm] Where can I get Browse other questions tagged buffer-overflow c or ask your own question. This value will then be used here: while( inser[i] < inser[j] && j >= 0 ) { ... } The logical “and”, &&, is a shortcut operator: its left-hand side (LHS)

What do I do with my leftover cash? It overwrites the current stack frame of your function with irrelevant data, and destroys the return address in the process, which is normally stored there among other things. Is Area of a circle always irrational Projectiles in a world devoid of gunpowder Why did Borden do that to his wife in The Prestige? I need your lighted advice for sure... -- View this message in context: http://sourceware-org.1504.n7.nabble.com/Cannot-find-bounds-of-current-function-when-stepping-with-GDB-7-6-under-OS-X-10-6-LLVM-GCC-4-2-tp259756.html Sent from the Sourceware - gdb list mailing list archive at Nabble.com.

share|improve this answer edited Feb 7 '14 at 14:27 answered Feb 6 '14 at 18:58 Eric Postpischil 43.1k54997 add a comment| up vote 0 down vote Assuming your Linux distro is The code generated by the compiler may include safeguards against accepting the buffer overflow itself. How to be Recommended to be a Sitecore MVP Dishwasher Hose Clamps won't open Is it ethical for a journal to cancel an accepted review request when they have obtained sufficient