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Merged
Opened Feb 24, 2020 by Ahmed Abd El Mawgood@oddcoderContributor

Add support for invoking ld.so via execve() and friends

  • Overview 0
  • Changes 4

The original implementation of relibc_ld_so_start assumes that ld.so will always be invoked manually as in "/lib/ld64.so ./a.out" The problem is regarding this snippet. if sp.argc < 2 { eprintln!("ld.so [executable] [arguments...]"); unistd::_exit(1); loop {} }

As such, In linux when user types "./a.out" he will recieve the message ld.so [executable] [arguments...]

This patch makes use of AUXV, specifically AT_ENTRY. When invoking ld.so manually, AT_ENTRY happens to be the entry point of ld.so. But when running ./a.out directly, AT_ENTRY becomes the entry point of a.out this patch compares AT_ENTRY to the entry point of ld.so, if they are equal only then it will assume that argv[1] is the real program and adjust the stack, otherwise it will proceed with the stack unadjusted.

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Reference: redox-os/relibc!257
Source branch: linux-ld

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