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-rw-r--r--arch/arm64/kernel/image.h40
1 files changed, 25 insertions, 15 deletions
diff --git a/arch/arm64/kernel/image.h b/arch/arm64/kernel/image.h
index bc2abb8b1599..999633bd7294 100644
--- a/arch/arm64/kernel/image.h
+++ b/arch/arm64/kernel/image.h
@@ -65,6 +65,16 @@
#ifdef CONFIG_EFI
/*
+ * Prevent the symbol aliases below from being emitted into the kallsyms
+ * table, by forcing them to be absolute symbols (which are conveniently
+ * ignored by scripts/kallsyms) rather than section relative symbols.
+ * The distinction is only relevant for partial linking, and only for symbols
+ * that are defined within a section declaration (which is not the case for
+ * the definitions below) so the resulting values will be identical.
+ */
+#define KALLSYMS_HIDE(sym) ABSOLUTE(sym)
+
+/*
* The EFI stub has its own symbol namespace prefixed by __efistub_, to
* isolate it from the kernel proper. The following symbols are legally
* accessed by the stub, so provide some aliases to make them accessible.
@@ -73,25 +83,25 @@
* linked at. The routines below are all implemented in assembler in a
* position independent manner
*/
-__efistub_memcmp = __pi_memcmp;
-__efistub_memchr = __pi_memchr;
-__efistub_memcpy = __pi_memcpy;
-__efistub_memmove = __pi_memmove;
-__efistub_memset = __pi_memset;
-__efistub_strlen = __pi_strlen;
-__efistub_strcmp = __pi_strcmp;
-__efistub_strncmp = __pi_strncmp;
-__efistub___flush_dcache_area = __pi___flush_dcache_area;
+__efistub_memcmp = KALLSYMS_HIDE(__pi_memcmp);
+__efistub_memchr = KALLSYMS_HIDE(__pi_memchr);
+__efistub_memcpy = KALLSYMS_HIDE(__pi_memcpy);
+__efistub_memmove = KALLSYMS_HIDE(__pi_memmove);
+__efistub_memset = KALLSYMS_HIDE(__pi_memset);
+__efistub_strlen = KALLSYMS_HIDE(__pi_strlen);
+__efistub_strcmp = KALLSYMS_HIDE(__pi_strcmp);
+__efistub_strncmp = KALLSYMS_HIDE(__pi_strncmp);
+__efistub___flush_dcache_area = KALLSYMS_HIDE(__pi___flush_dcache_area);
#ifdef CONFIG_KASAN
-__efistub___memcpy = __pi_memcpy;
-__efistub___memmove = __pi_memmove;
-__efistub___memset = __pi_memset;
+__efistub___memcpy = KALLSYMS_HIDE(__pi_memcpy);
+__efistub___memmove = KALLSYMS_HIDE(__pi_memmove);
+__efistub___memset = KALLSYMS_HIDE(__pi_memset);
#endif
-__efistub__text = _text;
-__efistub__end = _end;
-__efistub__edata = _edata;
+__efistub__text = KALLSYMS_HIDE(_text);
+__efistub__end = KALLSYMS_HIDE(_end);
+__efistub__edata = KALLSYMS_HIDE(_edata);
#endif