linux-kernel - [PATCH 0/7] objtool changes to remove most ANNOTATE_NOSPEC

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Message-Id: <20200402082220.808-1-alexandre.chartre@oracle.com>
Date:   Thu,  2 Apr 2020 10:22:13 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org, jpoimboe@...hat.com,
        peterz@...radead.org, jthierry@...hat.com, tglx@...utronix.de,
        alexandre.chartre@...cle.com
Subject: [PATCH 0/7] objtool changes to remove most ANNOTATE_NOSPEC_ALTERNATIVE

Hi,

Code like retpoline or RSB stuffing, which is used to mitigate some of
the speculative execution issues, is currently ignored by objtool with
the ANNOTATE_NOSPEC_ALTERNATIVE directive. This series adds support
for intra-function calls and trampoline return instructions to objtool
so that it can handle such a code. With these changes, we can remove
most ANNOTATE_NOSPEC_ALTERNATIVE directives.

Thanks,

alex.

--

Alexandre Chartre (7):
  objtool: is_fentry_call() crashes if call has no destination
  objtool: Allow branches within the same alternative.
  objtool: Add support for intra-function calls
  objtool: Add support for return trampoline call
  x86/speculation: Annotate intra-function calls
  x86/speculation: Annotate retpoline return instructions
  x86/speculation: Remove most ANNOTATE_NOSPEC_ALTERNATIVE

 arch/x86/include/asm/nospec-branch.h |  38 ++++--
 tools/objtool/check.c                | 172 +++++++++++++++++++++++++--
 tools/objtool/check.h                |   5 +-
 3 files changed, 196 insertions(+), 19 deletions(-)

-- 
2.18.2