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authorMasahiro Yamada <masahiroy@kernel.org>2023-06-12 00:50:54 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2023-06-22 21:21:06 +0900
commit6d62b1c46b1e6e1686a0cf6617c96c80d4ab5cd5 (patch)
treecd7844f90eb2d83679f0d1f31fbe556c8b1ed856 /scripts/mod
parent7d59313f19df0b55db6b31c5e4d4e828aa77d584 (diff)
modpost: check static EXPORT_SYMBOL* by modpost again
Commit 31cb50b5590f ("kbuild: check static EXPORT_SYMBOL* by script instead of modpost") moved the static EXPORT_SYMBOL* check from the mostpost to a shell script because I thought it must be checked per compilation unit to avoid false negatives. I came up with an idea to do this in modpost, against combined ELF files. The relocation entries in ELF will find the correct exported symbol even if there exist symbols with the same name in different compilation units. Again, the same sample code. Makefile: obj-y += foo1.o foo2.o foo1.c: #include <linux/export.h> static void foo(void) {} EXPORT_SYMBOL(foo); foo2.c: void foo(void) {} Then, modpost can catch it correctly. MODPOST Module.symvers ERROR: modpost: vmlinux: local symbol 'foo' was exported Signed-off-by: Masahiro Yamada <masahiroy@kernel.org> Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Diffstat (limited to 'scripts/mod')
-rw-r--r--scripts/mod/modpost.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index ce37e6de5df7..6c1f95d18515 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -1210,6 +1210,13 @@ static void check_export_symbol(struct module *mod, struct elf_info *elf,
return;
}
+ if (ELF_ST_BIND(sym->st_info) != STB_GLOBAL &&
+ ELF_ST_BIND(sym->st_info) != STB_WEAK) {
+ error("%s: local symbol '%s' was exported\n", mod->name,
+ label_name + strlen(prefix));
+ return;
+ }
+
name = sym_name(elf, sym);
if (strcmp(label_name + strlen(prefix), name)) {
error("%s: .export_symbol section references '%s', but it does not seem to be an export symbol\n",