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I also promised to fix readelf. Where in file(1) I made no attempt to
say what was bad (or even to change `goto bad` to explicitly say that
*anything* was bad), I believe that readelf is much more likely to be
shown invalid ELF files, and that it would be useful to have some clue
as to what's wrong. Relatedly, this patch removes all existing
error_exit() calls in case it's being used on multiple files.
Again, this survived ~24hrs of AFL++ trying to blow its house down.
Test: ~/AFLplusplus/afl-fuzz -i tests/files/elf -o fuzz-out -- ./readelf -a @@
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Looks like I left off half way through this!
Also default readelf to n while it's still in pending.
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Add -e, and stop documenting no-op -W.
Fix sign issues, and add a few extra sanity checks.
Redo the BE/LE 16/32/64 reading.
Remove the NOSPACE=1 from the -l test, and fix the -l code to match the
binutils output. Most usefully, this fixes the weird way the NULL
section's empty name would cause misalignment in the section to segment
mapping output.
Add a test for -s (symbol table).
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All of this was fine on LP64 where `long` and `long long` are the same
length, but breaks the LP32 build with -Wformat.
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The "historical" variant is still the only one in use on Android right
now. We still need to switch to the numbers we agreed on with the other
System V ABI users.
See https://groups.google.com/g/generic-abi/c/bX460iggiKg for the
original discussion on RELR.
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Basic readelf(1) implementation, with output close enough to the binutils
version to be usable with scripts that expect the binutils version. This
started as an implementation of nm(1) until I realized that I almost always
want readelf instead, and that you actually have to do much of the work
needed for readelf just to implement nm. Arguably nm (being part of POSIX)
belongs in toybox while readelf doesn't. An argument could also be made that
neither really belongs in toybox, belonging in a separate set of development
tools (such as binutils or the LLVM binutils).
Doesn't support most of the architecture-specific stuff, most notably
relocations, but is aware of things like ARM exidx sections and the common
register state notes in core dumps for the "big four" architectures: arm,
arm64, x86, and x86-64.
Doesn't support symbol versions (but probably should).
Doesn't support section groups or the -t "section details" (which is a long
form of -S "section headers" that I've never seen used in practice and which
isn't part of -a). Doesn't support dumping unwind info or the hash table
bucket histograms.
Reuses the table of ELF architectures from file(1).
Not fuzzed, but successfully parses all the ELF files in my Ubuntu 18.04
system's lib directories. Attempts to exit with an error when presented with
an invalid ELF file rather than struggle on as binutils seems to.
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