This is a note to let you know that I've just added the patch titled
bpftool: Fix bug for long instructions in program CFG dumps
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bpftool-fix-bug-for-long-instructions-in-program-cfg.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit ac143bf133b271ba82a04134d62bf067230e0d1b
Author: Quentin Monnet <quentin@xxxxxxxxxxxxx>
Date: Wed Apr 5 14:21:15 2023 +0100
bpftool: Fix bug for long instructions in program CFG dumps
[ Upstream commit 67cf52cdb6c8fa6365d29106555dacf95c9fd374 ]
When dumping the control flow graphs for programs using the 16-byte long
load instruction, we need to skip the second part of this instruction
when looking for the next instruction to process. Otherwise, we end up
printing "BUG_ld_00" from the kernel disassembler in the CFG.
Fixes: efcef17a6d65 ("tools: bpftool: generate .dot graph from CFG information")
Signed-off-by: Quentin Monnet <quentin@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230405132120.59886-3-quentin@xxxxxxxxxxxxx
Signed-off-by: Alexei Starovoitov <ast@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/bpf/bpftool/xlated_dumper.c b/tools/bpf/bpftool/xlated_dumper.c
index f1f32e21d5cd0..b91c62d0a7d62 100644
--- a/tools/bpf/bpftool/xlated_dumper.c
+++ b/tools/bpf/bpftool/xlated_dumper.c
@@ -369,8 +369,15 @@ void dump_xlated_for_graph(struct dump_data *dd, void *buf_start, void *buf_end,
struct bpf_insn *insn_start = buf_start;
struct bpf_insn *insn_end = buf_end;
struct bpf_insn *cur = insn_start;
+ bool double_insn = false;
for (; cur <= insn_end; cur++) {
+ if (double_insn) {
+ double_insn = false;
+ continue;
+ }
+ double_insn = cur->code == (BPF_LD | BPF_IMM | BPF_DW);
+
printf("% 4d: ", (int)(cur - insn_start + start_idx));
print_bpf_insn(&cbs, cur, true);
if (cur != insn_end)
