Commit c325c96b authored by Xiao Yang's avatar Xiao Yang Committed by Greg Kroah-Hartman

modpost: Get proper section index by get_secindex() instead of st_shndx

commit 4b8a5cfb upstream.

(uint16_t) st_shndx is limited to 65535(i.e. SHN_XINDEX) so sym_get_data() gets
wrong section index by st_shndx if requested symbol contains extended section
index that is more than 65535.  In this case, we need to get proper section index
by .symtab_shndx section.

Module.symvers generated by building kernel with "-ffunction-sections -fdata-sections"
shows the issue.

Fixes: 56067812 ("kbuild: modversions: add infrastructure for emitting relative CRCs")
Fixes: e84f9fbb ("modpost: refactor namespace_from_kstrtabns() to not hard-code section name")
Signed-off-by: default avatarXiao Yang <[email protected]>
Signed-off-by: default avatarMasahiro Yamada <[email protected]>
Signed-off-by: default avatarGreg Kroah-Hartman <[email protected]>
parent 492b7e93
......@@ -307,7 +307,8 @@ static const char *sec_name(struct elf_info *elf, int secindex)
static void *sym_get_data(const struct elf_info *info, const Elf_Sym *sym)
{
Elf_Shdr *sechdr = &info->sechdrs[sym->st_shndx];
unsigned int secindex = get_secindex(info, sym);
Elf_Shdr *sechdr = &info->sechdrs[secindex];
unsigned long offset;
offset = sym->st_value;
......
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