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

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commit 4b8a5cfb5f 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: 56067812d5 ("kbuild: modversions: add infrastructure for emitting relative CRCs")
Fixes: e84f9fbbec ("modpost: refactor namespace_from_kstrtabns() to not hard-code section name")
Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiao Yang
2020-03-18 18:34:16 +08:00
committed by Greg Kroah-Hartman
parent 492b7e9392
commit c325c96b4b
1 changed files with 2 additions and 1 deletions
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3
scripts/mod/modpost.c
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@@ -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) 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; unsigned long offset;
offset = sym->st_value; offset = sym->st_value;