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objtool: Fix noreturn detection for ignored functions 

When a function is annotated with STACK_FRAME_NON_STANDARD, objtool
doesn't validate its code paths.  It also skips sibling call detection
within the function.

But sibling call detection is actually needed for the case where the
ignored function doesn't have any return instructions.  Otherwise
objtool naively marks the function as implicit static noreturn, which
affects the reachability of its callers, resulting in "unreachable
instruction" warnings.

Fix it by just enabling sibling call detection for ignored functions.
The 'insn->ignore' check in add_jump_destinations() is no longer needed
after

  e6da956795 ("objtool: Don't use ignore flag for fake jumps").

Fixes the following warning:

  arch/x86/kvm/vmx/vmx.o: warning: objtool: vmx_handle_exit_irqoff()+0x142: unreachable instruction

which triggers on an allmodconfig with CONFIG_GCOV_KERNEL unset.

Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Link: https://lkml.kernel.org/r/5b1e2536cdbaa5246b60d7791b76130a74082c62.1599751464.git.jpoimboe@redhat.com
This commit is contained in:
Josh Poimboeuf 2020-09-10 10:24:57 -05:00 committed by Borislav Petkov
parent 856deb866d
commit db6c6a0df8
1 changed files with 1 additions and 1 deletions
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2
tools/objtool/check.c
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@ -619,7 +619,7 @@ static int add_jump_destinations(struct objtool_file *file)
if (!is_static_jump(insn)) if (!is_static_jump(insn))
continue; continue;
if (insn->ignore || insn->offset == FAKE_JUMP_OFFSET) if (insn->offset == FAKE_JUMP_OFFSET)
continue; continue;
reloc = find_reloc_by_dest_range(file->elf, insn->sec, reloc = find_reloc_by_dest_range(file->elf, insn->sec,