TODO


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pspax -u 0
errno = 0; uid = strtol(optarg, NULL, 10); if (uid == 0 && errno != 0) error("invalid value");

add support for RPATH checking with -nL ?

we truncate 64bit types in many places to (unsigned long) ... do we really
care though ?  this would be an issue if:
 - host is 32bit
 - object being analyzed is 64bit
 - object has symbols which is larger than 32bits

dumpelf does not do string checking in very very verbose mode.  it assumes the
strings are sane when dumping the sections.  only way around this is to check
everything single byte and print it out a character at a time ... sucks ...

we don't handle versioned symbols well.  take an ELF with debugging and do:
	scanelf -s '' elf
notice that glibc symbols generally have version info.  then search for that:
	scanelf -s foo@@ver elf
no hits as all of our symbol comparisons ignore the versioning info.

allow digging into ARM_ATTRIBUTES (.ARM.attributes) sections
	- need info on the section layout
	- figure out how to integrate cleanly (target-independent driller)
	https://sourceware.org/binutils/docs/as/GNU-Object-Attributes.html

scanelf should look at the dynamic table for rpath/needed/soname entries instead
of requiring section headers and looking up by section names.  need to implement
support for GNU_HASH first though so we can get the string table sizes.

rewrite elf->e_shnum handling.  if it's 0 (SH_UNDEF), then the size is
contained in the sh_size of the first section header at index 0.  add a
source code check too.