[Rpm-maint] [rpm-software-management/rpm] Harden against crafted inputs (#1471)

[Demi Marie Obenour]

@DemiMarie pushed 5 commits.

5774a927b28c2056aed9bd9fc3e39605e0b071de  Enable hardening flags where available
2b86b349a2f66f28a66080ddc9d8f6e76f9acbfb  Check that len is in range before using it
69a79e4a240e6b82d537d6fc76b57ace55a0e17a  Avoid incrementing a pointer past the end
ba0d0a02520737ac0bb2a0b68d8ebfd9457efb17  Check that ‘einfo.offset’ is reasonable
e74205f450f46917225e1b83da5e1aab1d58eb28  Require signature headers to be contiguous


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View it on GitHub:
https://github.com/rpm-software-management/rpm/pull/1471/files/86f8143ce0e14dbe5c173b75eb8122d81676c886..e74205f450f46917225e1b83da5e1aab1d58eb28
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