UserLAnd Version: 2. Whether the device is rooted: no Whether the device is running LineageOS: no. The text was updated successfully, but these errors were encountered:. Same problem occurs from cmake, in Debian only when running on xfce session.
Also I tried to install cmake from source, but it didn't work. Sorry, something went wrong. Then I compared the ELF header of libc. Skip to content. Star 2. New issue. As for the touch command, there are 27 section headers, and Listing 5 shows the first four of them plus the last one, only. Each line covers the section size, the section type as well as its address and memory offset.
The first candidate we will have a look at is the file utility. The second candidate is readelf. It displays detailed information about an ELF file. The list of switches is comparably long, and covers all the aspects of the ELF format. Using the switch -n short for —notes Listing 7 shows the note sections, only, that exist in the file touch — the ABI version tag, and the build ID bitstring. As of , there has not been a new release or update since Number three is the package named elfutils [6] that is purely available for Linux.
Last but not least we will mention objdump. This tool is similar to readelf but focuses on object files.
It provides a similar range of information about ELF files and other object formats. This set of utilities provides a number of tools that help to validate ELF files. As an example, dumpelf analyzes the ELF file, and returns a C header file containing the details — see Figure 2. Thanks to a combination of clever design and excellent documentation the ELF format works very well, and is still in use after 20 years. The utilities shown above allow you an insight view into an ELF file, and let you figure out what a program is doing.
These are the first steps for analyzing software — happy hacking! The writer would like to thank Axel Beckert for his support regarding the preparation of this article. Moreover, it may occur only if the program header table is part of the memory image of the program.
If it is present, it must precede any loadable segment entry. The presence of if present in the quote made me wonder what would happen if I just jumped over the PHDR header. Only changing the 20th byte , to jump over the length of the PHDR header. I run readelf again to verify it's still a valid ELF file:. And surprisingly the program still executes perfectly fine. Why do we even need the PHDR header? It seems like it's not used during runtime at all so why do we have this lying around?
Note that although valid ELF, it now has corrupted 11th entry in the in the program header table since you didn't decrement the count of program headers. This program doesn't use any features of the dynamic linker, so the fact that you've corrupted its structures doesn't manifest itself. Now try to call some routines from libc. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow.
Learn more. If so, why? Ask Question. Asked 1 year, 8 months ago.
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