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| author |   Marco Elver <elver@google.com> | 2021-05-21 09:26:10 +0200 |
|---|---|---|
| committer |   Kees Cook <keescook@chromium.org> | 2021-05-24 15:24:33 -0700 |
| commit | 1cb61759d40716643281b8e0f8c7afebc8699249 (patch) | |
| tree | 94db3431b470b79d30146ff744b4294c591876a5 /include/linux/init.h | |
| parent | Linux 5.13-rc2 (diff) | |
| download | linux-dev-1cb61759d40716643281b8e0f8c7afebc8699249.tar.xz linux-dev-1cb61759d40716643281b8e0f8c7afebc8699249.zip | |
init: verify that function is initcall_t at compile-time
In the spirit of making it hard to misuse an interface, add a
compile-time assertion in the CONFIG_HAVE_ARCH_PREL32_RELOCATIONS case
to verify the initcall function matches initcall_t, because the inline
asm bypasses any type-checking the compiler would otherwise do. This
will help developers catch incorrect API use in all configurations.
A recent example of this is:
https://lkml.kernel.org/r/20210514140015.2944744-1-arnd@kernel.org
Signed-off-by: Marco Elver <elver@google.com>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Tested-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210521072610.2880286-1-elver@google.com
Diffstat (limited to 'include/linux/init.h')
| -rw-r--r-- | include/linux/init.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/init.h b/include/linux/init.h index 045ad1650ed1..d82b4b2e1d25 100644 --- a/include/linux/init.h +++ b/include/linux/init.h @@ -242,7 +242,8 @@ extern bool initcall_debug; asm(".section \"" __sec "\", \"a\" \n" \ __stringify(__name) ": \n" \ ".long " __stringify(__stub) " - . \n" \ - ".previous \n"); + ".previous \n"); \ + static_assert(__same_type(initcall_t, &fn)); #else #define ____define_initcall(fn, __unused, __name, __sec) \ static initcall_t __name __used \ |