diff options
author | Peter Zijlstra <peterz@infradead.org> | 2023-08-16 14:59:21 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-08-26 15:23:40 +0300 |
commit | 484eefc6ff9c6dc03f056d0ec4056fc667cef3d2 (patch) | |
tree | dffb22e82dfce8d98917e45dd0fe89877b7887d0 /tools | |
parent | 55f1cbeaa15945e38bf892380966a9eb90f7734b (diff) | |
download | linux-484eefc6ff9c6dc03f056d0ec4056fc667cef3d2.tar.xz |
objtool/x86: Fixup frame-pointer vs rethunk
commit dbf46008775516f7f25c95b7760041c286299783 upstream.
For stack-validation of a frame-pointer build, objtool validates that
every CALL instruction is preceded by a frame-setup. The new SRSO
return thunks violate this with their RSB stuffing trickery.
Extend the __fentry__ exception to also cover the embedded_insn case
used for this. This cures:
vmlinux.o: warning: objtool: srso_untrain_ret+0xd: call without frame pointer save/setup
Fixes: 4ae68b26c3ab ("objtool/x86: Fix SRSO mess")
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20230816115921.GH980931@hirez.programming.kicks-ass.net
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'tools')
-rw-r--r-- | tools/objtool/check.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/tools/objtool/check.c b/tools/objtool/check.c index d99ba1bd7349..f9ff878d6ba1 100644 --- a/tools/objtool/check.c +++ b/tools/objtool/check.c @@ -2174,12 +2174,17 @@ static int decode_sections(struct objtool_file *file) return 0; } -static bool is_fentry_call(struct instruction *insn) +static bool is_special_call(struct instruction *insn) { - if (insn->type == INSN_CALL && - insn->call_dest && - insn->call_dest->fentry) - return true; + if (insn->type == INSN_CALL) { + struct symbol *dest = insn->call_dest; + + if (!dest) + return false; + + if (dest->fentry) + return true; + } return false; } @@ -3125,7 +3130,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func, if (ret) return ret; - if (!no_fp && func && !is_fentry_call(insn) && + if (!no_fp && func && !is_special_call(insn) && !has_valid_stack_frame(&state)) { WARN_FUNC("call without frame pointer save/setup", sec, insn->offset); |