Martin KaFai Lau d9762e84ed bpf: verbose log bpf_line_info in verifier ... This patch adds bpf_line_info during the verifier's verbose. It can give error context for debug purpose. ~~~~~~~~~~ Here is the verbose log for backedge: while (a) { a += bpf_get_smp_processor_id(); bpf_trace_printk(fmt, sizeof(fmt), a); } ~> bpftool prog load ./test_loop.o /sys/fs/bpf/test_loop type tracepoint 13: while (a) { 3: a += bpf_get_smp_processor_id(); back-edge from insn 13 to 3 ~~~~~~~~~~ Here is the verbose log for invalid pkt access: Modification to test_xdp_noinline.c: data = (void *)(long)xdp->data; data_end = (void *)(long)xdp->data_end; /* if (data + 4 > data_end) return XDP_DROP; */ *(u32 *)data = dst->dst; ~> bpftool prog load ./test_xdp_noinline.o /sys/fs/bpf/test_xdp_noinline type xdp ; data = (void *)(long)xdp->data; 224: (79) r2 = *(u64 *)(r10 -112) 225: (61) r2 = *(u32 *)(r2 +0) ; *(u32 *)data = dst->dst; 226: (63) *(u32 *)(r2 +0) = r1 invalid access to packet, off=0 size=4, R2(id=0,off=0,r=0) R2 offset is outside of the packet Signed-off-by: Martin KaFai Lau <kafai@fb.com> Acked-by: Yonghong Song <yhs@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org>		2018-12-14 14:17:34 -08:00
..
arraymap.c	bpf: pass struct btf pointer to the map_check_btf() callback	2018-12-12 15:33:33 -08:00
bpf_lru_list.c
bpf_lru_list.h
btf.c	bpf: Create a new btf_name_by_offset() for non type name use case	2018-12-14 14:17:34 -08:00
cgroup.c
core.c
cpumap.c
devmap.c
disasm.c
disasm.h
hashtab.c
helpers.c
inode.c
local_storage.c	bpf: add bpffs pretty print for cgroup local storage maps	2018-12-12 15:33:38 -08:00
lpm_trie.c	bpf: pass struct btf pointer to the map_check_btf() callback	2018-12-12 15:33:33 -08:00
Makefile
map_in_map.c
map_in_map.h
offload.c
percpu_freelist.c
percpu_freelist.h
queue_stack_maps.c
reuseport_array.c
stackmap.c
syscall.c	bpf: remove obsolete prog->aux sanitation in bpf_insn_prepare_dump	2018-12-13 12:42:44 -08:00
tnum.c
verifier.c	bpf: verbose log bpf_line_info in verifier	2018-12-14 14:17:34 -08:00
xskmap.c