Introduce ELF binfmt loader #79
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POSIX defines the minimum total size of argv + envp to ARG_MAX, and leaves the inclusion of NULL terminators, pointers and / or alignment bytes as implementation defined. The policy we implement is: - Permit the total length to exceed ARG_MAX as long as it's not greater than 1/4 of the stack size. This is essentially the same policy as linux (see execve(2)), with the difference that we don't apply the MAX_ARG_STRLEN floor of 32 pages. - Exclude auxv, NULL, andlignment bytes from the checked size, as these are of fixed size and occupy an insignificant portion of the stack. Signed-off-by: Michalis Pappas <michalis@unikraft.io>
Add binfmt loader for ELF. This is the default loader used on execve(). Signed-off-by: Michalis Pappas <michalis@unikraft.io>
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unikraft/unikraft#1386 implements
execve()via the newly introducedlibukbinfmt, which allows the registration of loaders of different binary file formats. This PR introduces the ELF binfmt loader, which is used internally byexecve().GitHub-Depends-On: #73
GitHub-Depends-On: #77