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it was reported by clang with the option -fsanitize=memory:
Uninitialized bytes in MemcmpInterceptorCommon at offset 0 inside [0x7070000002a0, 56)
==3791089==WARNING: MemorySanitizer: use-of-uninitialized-value
#0 0x482a2c in memcmp (fuzzer+0x482a2c)
#1 0x7fed2f120ebb in _hsh_add src/libseccomp/src/gen_bpf.c:598:9
#2 0x7fed2f121715 in _gen_bpf_action_hsh src/libseccomp/src/gen_bpf.c:796:6
#3 0x7fed2f121a53 in _gen_bpf_node src/libseccomp/src/gen_bpf.c:831:11
#4 0x7fed2f121a53 in _gen_bpf_chain.isra.0 src/libseccomp/src/gen_bpf.c:1072:13
#5 0x7fed2f121f16 in _gen_bpf_chain_lvl_res src/libseccomp/src/gen_bpf.c:977:12
#6 0x7fed2f121c74 in _gen_bpf_chain.isra.0 src/libseccomp/src/gen_bpf.c:1124:12
#7 0x7fed2f12253c in _gen_bpf_syscall src/libseccomp/src/gen_bpf.c:1520:10
#8 0x7fed2f12253c in _gen_bpf_syscalls src/libseccomp/src/gen_bpf.c:1615:18
#9 0x7fed2f12253c in _gen_bpf_arch src/libseccomp/src/gen_bpf.c:1683:7
#10 0x7fed2f12253c in _gen_bpf_build_bpf src/libseccomp/src/gen_bpf.c:2056:11
#11 0x7fed2f12253c in gen_bpf_generate src/libseccomp/src/gen_bpf.c:2321:7
#12 0x7fed2f11f41c in seccomp_export_bpf src/libseccomp/src/api.c:724:7
Uninitialized value was created by a heap allocation
#0 0x4547ef in realloc (fuzzer+0x4547ef)
#1 0x7fed2f121244 in _blk_resize src/libseccomp/src/gen_bpf.c:362:8
#2 0x7fed2f121244 in _blk_append src/libseccomp/src/gen_bpf.c:394:6
Signed-off-by: Giuseppe Scrivano <gscrivan@redhat.com>
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