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kbuild: lto: fix module versioning

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With CONFIG_MODVERSIONS, version information is linked into each
compilation unit that exports symbols. With LTO, we cannot use this
method as all C code is compiled into LLVM bitcode instead. This
change collects symbol versions into .symversions files and merges
them in link-vmlinux.sh where they are all linked into vmlinux.o at
the same time.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20201211184633.3213045-4-samitolvanen@google.com
This commit is contained in:
Sami Tolvanen
2020-12-11 10:46:20 -08:00
committed by Kees Cook
parent dc5723b02e
commit 38e8918490
6 changed files with 61 additions and 6 deletions
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.gitignore vendored
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@@ -41,6 +41,7 @@
*.so.dbg
*.su
*.symtypes
*.symversions
*.tab.[ch]
*.tar
*.xz