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| author | Peter Zijlstra <peterz@infradead.org> | 2025-05-02 17:12:09 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-07-10 17:03:18 +0300 |
| commit | adb29b437fe58d41bd5d4a5c3d63bf1bb02f0877 (patch) | |
| tree | efed048a428a09ccdb66139b9169ca2ab2a49ac0 /include/linux | |
| parent | a6069306f4e18b9a0bb4d778726a451ea96dbff2 (diff) | |
| download | linux-adb29b437fe58d41bd5d4a5c3d63bf1bb02f0877.tar.xz | |
module: Provide EXPORT_SYMBOL_GPL_FOR_MODULES() helper
[ Upstream commit 707f853d7fa3ce323a6875487890c213e34d81a0 ]
Helper macro to more easily limit the export of a symbol to a given
list of modules.
Eg:
EXPORT_SYMBOL_GPL_FOR_MODULES(preempt_notifier_inc, "kvm");
will limit the use of said function to kvm.ko, any other module trying
to use this symbol will refure to load (and get modpost build
failures).
Requested-by: Masahiro Yamada <masahiroy@kernel.org>
Requested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Petr Pavlu <petr.pavlu@suse.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Stable-dep-of: cbe4134ea4bc ("fs: export anon_inode_make_secure_inode() and fix secretmem LSM bypass")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/export.h | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/include/linux/export.h b/include/linux/export.h index 9911508a9604..06f7a4eb6492 100644 --- a/include/linux/export.h +++ b/include/linux/export.h @@ -42,11 +42,17 @@ extern struct module __this_module; .long sym #endif -#define ___EXPORT_SYMBOL(sym, license, ns) \ +/* + * LLVM integrated assembler cam merge adjacent string literals (like + * C and GNU-as) passed to '.ascii', but not to '.asciz' and chokes on: + * + * .asciz "MODULE_" "kvm" ; + */ +#define ___EXPORT_SYMBOL(sym, license, ns...) \ .section ".export_symbol","a" ASM_NL \ __export_symbol_##sym: ASM_NL \ .asciz license ASM_NL \ - .asciz ns ASM_NL \ + .ascii ns "\0" ASM_NL \ __EXPORT_SYMBOL_REF(sym) ASM_NL \ .previous @@ -88,4 +94,6 @@ extern struct module __this_module; #define EXPORT_SYMBOL_NS(sym, ns) __EXPORT_SYMBOL(sym, "", __stringify(ns)) #define EXPORT_SYMBOL_NS_GPL(sym, ns) __EXPORT_SYMBOL(sym, "GPL", __stringify(ns)) +#define EXPORT_SYMBOL_GPL_FOR_MODULES(sym, mods) __EXPORT_SYMBOL(sym, "GPL", "module:" mods) + #endif /* _LINUX_EXPORT_H */ |