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authorMarco Elver <elver@google.com>2021-05-21 09:26:10 +0200
committerKees Cook <keescook@chromium.org>2021-05-24 15:24:33 -0700
commit1cb61759d40716643281b8e0f8c7afebc8699249 (patch)
tree94db3431b470b79d30146ff744b4294c591876a5 /include
parentd07f6ca923ea0927a1024dfccafc5b53b61cfecc (diff)
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')
-rw-r--r--include/linux/init.h3
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 \

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