The bcomp from zhenrong-wang

bcomp's Introduction

Hi there 👋

🔭 I’m currently working on Cloud High-Performance Computing
🌱 I’m currently learning cloud infrastructure-as-code
👯 I’m looking to collaborate on the project HPC-NOW
🤔 I’m looking for help with developing the project HPC-NOW
📫 How to reach me: [email protected]
⚡ Fun fact: I sometimes write bugs :)

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bcomp's Issues

Cannot decompress data compressed by this tool.

Steps to reproduce:

$ ./bcomp -c data_a.dat data_b.dat
INFO: Compressed file data_a.dat to data_b.dat.bc . Return Value: 0.
Repository: https://github.com/zhenrong-wang/bcomp

$ ./bcomp -d data_b.dat.bc data_c.dat
INFO: Decompressed file data_b.dat.bc to data_c.dat .
Repository: https://github.com/zhenrong-wang/bcomp

data_a.zip

Decompressing random file fails with buffer overflow.

Create file with length of 4 bytes: 0xff, 0xff, 0x00, 0x00 and try to decompress it. Result is stack buffer overflow accessing variable dict_elem_size, it uses index 3 and index 3. But the array has size only of [4][3] elements.

After compressing single-byte length file, it fails to decompress it.

Steps to reproduce:

$ gcc bcomp.c -o bcomp
$ echo -n 2 > data_a.dat
$ md5sum data_a.dat
c81e728d9d4c2f636f067f89cc14862c *data_a.dat
$ ./bcomp.exe -c data_a.dat data_b.dat
INFO: Compressed file data_a.dat to data_b.dat.bc . Return Val: 0.
Repository: https://github.com/zhenrong-wang/bcomp
$ ./bcomp.exe -d data_b.dat.bc data_c.dat
INFO: Decompressed file data_b.dat.bc to data_c.dat . Return Val: 0.
Repository: https://github.com/zhenrong-wang/bcomp
$ md5sum data_c.dat
2df02d17bb56e32a8c4515a196e2b5cd *data_c.dat

Decompressing random file fails with buffer overflow at line 477.

Create file with length of 6 bytes: 0xe2 0x00 0xff 0xff 0x00 0x04 and try to decompress it. Result is stack buffer overflow accessing variable dict_elems, it uses index 7. But the array has size only of [6] elements.

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