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This file was introduced with linux-3.2, use it instead of probing for it
via prctl(PR_CAPBSET_READ).
For now, keep the old code for backwards compat. We can drop it once 3.2
is our lowest requirement.
The test-cap-list code is extended to verify cap_last_cap() is the same as
we'd get via prctl probing and /proc.
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The new test-cap-list introduced in commit 2822da4fb7f891 uses the included
table of capabilities. However, it uses cap_last_cap() which probes the kernel
for the last available capability. On an older kernel (e.g. 3.10 from RHEL 7)
that causes the test to fail with the following message:
Assertion '!capability_to_name(cap_last_cap()+1)' failed at src/test/test-cap-list.c:30, function main(). Aborting.
Fix it by exporting the size of the static table and using it in the test
instead of the dynamic one from the current kernel.
Tested by successfully running ./test-cap-list and the whole `make check` test
suite with this patch on a RHEL 7 host.
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names it knows
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cap_to_name(), for compat reasons
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This way, we can ensure we have a more complete, up-to-date list of
capabilities around, always.
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