Troubleshooting Linux Kernel Dynamic Linking

Troubleshooting Linux Kernel Dynamic Linking

If you have seen the dynamically linked Linux kernel, this article should help you.

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    A dynamic linker is an environment that manages shared DLLs on behalf of an executable file. It reserves the loading of libraries into memory and modifies the program at runtime to call the functions of each library.

    Is it true that many shared libraries cancan be either dynamically linked (using LD_LIBRARY_PATH ) or dynamically loaded (using dlopen() , dlsym() then dlclose() )?

    Yes. The difference is that dynamic links are controlled by the perspective linker, and when you run the tutorial (from the point of view of the author of the program), these libraries have been linked and all symbols have been recently resolved; With dynamic loading, everything has to be loaded manually.

    Is any module included in the Linux kernel library?

    More or less, but the loading methods are different. The dynamic linker, and therefore libdl, is only in user space because it cannot be used in the kernel.

    How does Linux dynamically implement a kernel module? Is it close to dynamic linking (using LD_LIBRARY_PATH) or dynamic buffering (using dlopen() , dlsym() and dlclose()) )?

    The core bundles modules with load_module which should do all the work themselves: load your current ELF object, assign the necessary ques y, perform all movements, etc. It also launches some special modules. by race: check their license, specifically these sysfs products to call their init function …

    load_module can be freely accessed through user space by purchasing the init_module or finit_module system calls.

    In ELF, the executable is called the “ELF interpreter”. On Linux (for example) this is /lib64/ld-linux-x86-64.so.2

    dynamic linking linux kernel

    This is not for the kernel and [generally] in glibc and. others.

    When the kernel executes the specified ELF executable, it must pass the executable to user space. At this point, it looks for an extended subkey named INTERP [which contains the actual string representing the full path].

    The kernel then maps the interpreter to user-space memory and checks the transfers along the way. The interpreter then performs all the necessary links / downloads and launches the appropriate program.

    Does Linux have dynamic linking?

    GNU / Linux has two ways of working with the discussed libraries (each is from Sun Solaris). You can dynamically link this program to a shared library and let Linux load the library on the fly (unless it’s already in memory).

    Since ELF stands for the “extensible format” of the linker, this important fact allowscreate many different subsections using the ELF file.

    Instead of overloading the kernel with more or less knowledge of many extensions, the ELF interpreter associated with the file knows this.

    How are kernel modules linked?

    The user can link a module within a running kernel by running insmod as an external program. This program does the following: Reads from each command line the name of your current module for reference. Finds the promo code file for your module object in the system directory tree.

    Although usually your system only uses your format, your system may have several variants of ELF files, each with its own ELF interpreter.

    This [for example] will allow the BSD ELF file to run on a different Linux system [with settings / support] simply because the ELF file will be preferred over the BSD ELF interpreter over the Linux interpreter.

    Each process (vlc disk, chrome) shared the ld.so library as part of the repository address.

    Yes. I assume you are looking for / proc / / maps . These are mappings (for example, using To mmap ) of electronic files. This is a different “download” than what the shortcut [symbol] might mean.

    First of all,

    so the loader, after loading your executable file (code and data) into memory, loads and matches the dynamic link (.so) with the address of its place

    The best way to understand this is to rephrase what I just said:

    So basically the real kernel, after the executable (code and data) has been mapped to memory, the kernel maps the dynamic linker (.so) to the confrontation program space

    In fact, this is correct. The kernel also renders other things such as the bss segment and the entire stack. It then pushes argc , argv and other envp [space for condition variables] onto the stack.

    >

    Next, when determining the start address ld.so [by looking at a special section of the native file], it is determined that this digest and the entire wire will begin from this address. Before

    So far, some kernels have done something. The kernel does practically nothing to bind symbols.

    ‘s that load, host, and resolve other shared libraries to point to your local library. It then invokes the good record (_start)

    How we use dynamic linking in Linux?

    compile the code of any application (put math.h in the functions folder) $ cc -c libapp.c -Iinclude -app.o.Link to import library math.lib. $ ld app.o -lmath -o app.Copy my libmath.so to the current library path or run the application. $. / app.

    Because the original (for example, an executable, such as vlc ) has been mapped tomemory, ld.so can check it for a list of the shared libraries it needs. It arranges them in memory, but doesn’t necessarily connect the characters correctly.

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  • The start address of the executable [not to be confused with the new start address ld.so ] is removed from the special ELF section of the executable. Although the symbol corresponding to the start address is traditionally named _start , in general it can have any name (for example, __my_start ), the element, as it appears, looks like a data section, which specifies the start address, not the address of the character _start

    Associating symbol references with symbol definitions takes time. So this is deferred until the particular character is actually used. That is, if there are references in the program that become printf , the linker does not actually check the reference to printf until the temporary program actually becomes printf

    dynamic linking linux kernel

    This is sometimes referred to as “request binding” and/or “request binding”. See my answer here: which segmentsDoes it copy once on write? for a more detailed explanation of why and what exactly when an executable is mapped to user space.

    If you’re interested, you can attach ldd/usr/bin/vlc for a list of used libraries. If you look at the output of readelf -a /usr/bin/vlc you will see that users are using the same libraries. Additionally, you must create the full path to the ELF interpreter and specify

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