diff options
| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2026-03-09 09:03:05 -0700 |
|---|---|---|
| committer | Josh Poimboeuf <jpoimboe@kernel.org> | 2026-03-16 15:31:25 -0700 |
| commit | 4e5019216402ad0b4a84cff457b662d26803f103 (patch) | |
| tree | 7b06f55538b7aef35eb8060b80da556f7f6058af | |
| parent | 6f93f7b06810d04acc6b106a7d5ecd6000f80545 (diff) | |
objtool: Fix Clang jump table detection
With Clang, there can be a conditional forward jump between the load of
the jump table address and the indirect branch.
Fixes the following warning:
vmlinux.o: warning: objtool: ___bpf_prog_run+0x1c5: sibling call from callable instruction with modified stack frame
Reported-by: Arnd Bergmann <arnd@arndb.de>
Closes: https://lore.kernel.org/a426d669-58bb-4be1-9eaa-6f3d83109e2d@app.fastmail.com
Link: https://patch.msgid.link/7d8600caed08901b6679767488acd639f6df9688.1773071992.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
| -rw-r--r-- | tools/objtool/check.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index 91b3ff4803cf..b6765e876507 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -2184,12 +2184,11 @@ static void mark_func_jump_tables(struct objtool_file *file, last = insn; /* - * Store back-pointers for unconditional forward jumps such + * Store back-pointers for forward jumps such * that find_jump_table() can back-track using those and * avoid some potentially confusing code. */ - if (insn->type == INSN_JUMP_UNCONDITIONAL && insn->jump_dest && - insn->offset > last->offset && + if (insn->jump_dest && insn->jump_dest->offset > insn->offset && !insn->jump_dest->first_jump_src) { |