Messages in this thread |  | | From | Alexandre Chartre <> | Subject | [PATCH 0/7] objtool changes to remove most ANNOTATE_NOSPEC_ALTERNATIVE | Date | Thu, 2 Apr 2020 10:22:13 +0200 |
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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.
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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
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