bpfloader: don't depend on symtab ordering to find function name
readCodeSections implicitly assumes that a function's name will be the
first symbol in its section to appear in the symbol table, but this is
not guaranteed. In particular, when compiling with -g the section name
can appear before it, resulting in a failure to find the bpf_prog_def
information for that section's program.
Add a check for the STT_FUNC symbol type to narrow our search to the
function name symbol we actually want.
Also, add a test to check that a program with a minimum kernel version
of infinity will not be loaded, to verify that bpfloader successfully
finds bpf_prog_def information.
Test: boot & confirm progs all have correct owners & permissions
Test: build time_in_state.c with -g and confirm owner & permissions
set correctly
Test: libbpf_load_test now passes iff this fix is applied
Signed-off-by: Connor O'Brien <connoro@google.com>
Change-Id: I31db0c50d3adeed86ee5810b1a0fb972f56fdb47
2 files changed
