[RFC PATCH 07/28] scripts/kallsyms: Avoid 0x0 as the relative base

Ard Biesheuvel
2024-09-25T15:02:08Z

From: Ard Biesheuvel <ardb@kernel.org>

In some cases, LLVM's lld linker may emit the following symbol into the
symbol table

0000000000000000 ? _GLOBAL_OFFSET_TABLE_

and its presence throws off the relative base logic in kallsyms. Since
0x0 is never a valid relative base, just ignore it.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
---
scripts/kallsyms.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 03852da3d249..09757d300a05 100644
--- a/scripts/kallsyms.c
+++ b/scripts/kallsyms.c
@@ -747,7 +747,7 @@ static void record_relative_base(void)
unsigned int i;

for (i = 0; i < table_cnt; i++)
- if (!symbol_absolute(table[i])) {
+ if (table[i]->addr && !symbol_absolute(table[i])) {
/*
* The table is sorted by address.
* Take the first non-absolute symbol value.
--
2.46.0.792.g87dc391469-goog