fixing typos
Signed-off-by: Julien CLEMENT <julien.clement@epita.fr>
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@ -19,7 +19,7 @@ enableEmoji = true
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dateformNumTime = "2006-01-02 15:04"
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# Subtitle for home
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homeSubtitle = "de la conf de Julien"
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homeSubtitle = ""
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# Set disableReadOtherPosts to true in order to hide the links to other posts.
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disableReadOtherPosts = false
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@ -29,7 +29,7 @@ enableEmoji = true
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# Metadata mostly used in document's head
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description = ""
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keywords = "homepage, blog, crypto, reverse"
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keywords = "homepage, blog, crypto, reverse, exploit"
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images = [""]
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[[params.social]]
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@ -69,7 +69,7 @@ enableEmoji = true
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[languages.en.params.logo]
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logoMark = "juju@synacktiv ~$ "
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logoText = "cryptopouneur"
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logoText = "objdump -d"
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logoHomeLink = "/"
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logoCursorColor = "#3884FF"
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# or
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@ -129,12 +129,12 @@ A small fast forward in time as the main function is really straight forward,
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The program takes the path to the device to encrypt as argument, calls a bunch
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of function that are mostly wrappers around libext2fs functions to initialize
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some global variables holding structures of the EXT filesystem. It alsos checks
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some global variables holding structures of the EXT filesystem. It also checks
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that some flags are set in the structures of libext2fs, I do not know if these
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flags are implementation specific or are standard EXT flags but I did not
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bother too much with this.
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The intersting stuff is at the end, I can see that it calls a function that
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The interesting stuff is at the end, I can see that it calls a function that
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I called `encrypt_folder` after reversing it. It then flushes the filesystem to
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disk and write the inode bitmap.
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@ -145,8 +145,8 @@ disk and write the inode bitmap.
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Alright so let's take a look at the `encrypt_folder` to understand why I called
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it this way.
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I could clearly see from `main` that function was called with the string `.`
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to reference the current directory, and a function pointer that was still
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I could clearly see from `main` that this function was called with the string
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`.` to reference the current directory, and a function pointer that was still
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unkown to me at the time but that I renamed `encrypt_file`.
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How I knew that the function was encrypting folders and that the parameter was
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@ -225,7 +225,7 @@ on a third bitboard at the coordinates indexed by the operands.
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So my decompiler really despise this function, I told you it took the whole
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context as parameters but its not exactly true as it actually packs the whole
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context in 10 `int128_t` arguments using SIMD instructions. I cleaned up the
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function call for your eyes so you do not have de keep tracks of the 12
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function call for your eyes so you do not have de keep track of the 12
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parameters of the function.
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{{< code file="/static/diplodocus/case4_stripped.c" language="c" >}}
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@ -336,7 +336,7 @@ time solving it manually. I might start to implement a SAT solver or som...
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But wait, did you spot something sus with this implementation ?
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{{< image src="/diplodocus/the_rock.jpg" style="border-radius: 8px;" >}}
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{{< image src="/diplodocus/the_rock.gif" style="border-radius: 8px;" >}}
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## Bypassing the puzzle
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@ -32,7 +32,6 @@ int64_t encrypt_file2(char* name)
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// Determine if another block is needed to encrypt the file
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int32_t n_blocks = len_read / 0x1000;
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int32_t len_read;
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if (len_read % 0x1000 != 0)
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stop = 1;
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@ -3,8 +3,6 @@ int32_t main(int32_t argc, char** argv, char** envp)
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int32_t res;
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if (argc != 2)
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{
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char** rax;
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rax = 0;
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printf("Usage %s <device> \n", *(int64_t*)argv);
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res = 1;
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}
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