Fwd: Negation overflow in readelf.c

[Dingbao Xie]

Dear developers,

I have found 3 undefined behaviors in readelf.

If you build binutils-2.25 with ubsan (require gcc-4.9 or clang-3.3)

and execute command: readelf -a test_file (test files are in the attachment).

You will see 3 runtime errors:

readelf.c:1543:39: runtime error: negation of -9223372036854775808 cannot be represented in type 'bfd_signed_vma' (aka 'long'); cast to an unsigned type to negate this value to itself

readelf.c:1555:36: runtime error: negation of -9223372036854775808 cannot be represented in type 'bfd_signed_vma' (aka 'long'); cast to an unsigned type to negate this value to itself

readelf.c:8374:39: runtime error: signed integer overflow: 8521 - -9223372036854775112 cannot be represented in type 'long'

Can you please take a look?

--

Dingbao Xie

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