From: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
[ Upstream commit 5141d3a06b2da1731ac82091298b766a1f95d3d8 ]
elf_update_symbol fails to preserve the special st_shndx values
between [SHN_LORESERVE, SHN_HIRESERVE], which results in it
converting SHN_ABS entries into SHN_UNDEF, for example. Explicitly
check for the special indexes and ensure these symbols are not
marked undefined.
Fixes: ead165fa1042 ("objtool: Fix symbol creation")
Signed-off-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20220908215504.3686827-17-samitolvanen@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
tools/objtool/elf.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c
index c25e957c1e52..7e24b09b1163 100644
--- a/tools/objtool/elf.c
+++ b/tools/objtool/elf.c
@@ -619,6 +619,11 @@ static int elf_update_symbol(struct elf *elf, struct section *symtab,
Elf64_Xword entsize = symtab->sh.sh_entsize;
int max_idx, idx = sym->idx;
Elf_Scn *s, *t = NULL;
+ bool is_special_shndx = sym->sym.st_shndx >= SHN_LORESERVE &&
+ sym->sym.st_shndx != SHN_XINDEX;
+
+ if (is_special_shndx)
+ shndx = sym->sym.st_shndx;
s = elf_getscn(elf->elf, symtab->idx);
if (!s) {
@@ -704,7 +709,7 @@ static int elf_update_symbol(struct elf *elf, struct section *symtab,
}
/* setup extended section index magic and write the symbol */
- if (shndx >= SHN_UNDEF && shndx < SHN_LORESERVE) {
+ if ((shndx >= SHN_UNDEF && shndx < SHN_LORESERVE) || is_special_shndx) {
sym->sym.st_shndx = shndx;
if (!shndx_data)
shndx = 0;
--
2.35.1
