tree 97478537891feb00d442d1e0eba5be1c0d64eefc
parent 07bab525e24725aaacd71e7cc63dfc31d48ba8a7
author Torne (Richard Coles) <torne@google.com> 1398869320 +0100
committer Torne (Richard Coles) <torne@google.com> 1399037145 +0100

Handle empty relro segment or incorrectly sized file.

If the file has no relro segment, the generated relro file will have
length 0, which caused mmap to fail. If the relro file has nonzero size,
but is too short (e.g. because it's for the wrong version of the
library), the linker would segfault while comparing the data. Fix both
these issues: don't try to map a zero length file, and don't try to
compare data that would be beyond the end of the file.

Improve test to explicitly generate two versions of the library: one
with -z relro, and one with -z norelro, so we can test both cases; also
explicitly test the case where the relro file has length 0.

Bug: 14299541
Change-Id: Id8b95585edda90e8bb5de452a35b70ed2d224934