objtool: Fix .symtab_shndx handling for elf_create_undef_symbol()
stable inclusion from stable-v5.10.133 commit a0319253825ebd8c5b19e31902c4f35f85e93285 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5PTAS CVE: CVE-2022-29900,CVE-2022-23816,CVE-2022-29901 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=a0319253825ebd8c5b19e31902c4f35f85e93285 -------------------------------- commit 584fd3b3 upstream. When an ELF object uses extended symbol section indexes (IOW it has a .symtab_shndx section), these must be kept in sync with the regular symbol table (.symtab). So for every new symbol we emit, make sure to also emit a .symtab_shndx value to keep the arrays of equal size. Note: since we're writing an UNDEF symbol, most GElf_Sym fields will be 0 and we can repurpose one (st_size) to host the 0 for the xshndx value. Fixes: 2f2f7e47 ("objtool: Add elf_create_undef_symbol()") Reported-by: NNick Desaulniers <ndesaulniers@google.com> Suggested-by: NFangrui Song <maskray@google.com> Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org> Tested-by: NNick Desaulniers <ndesaulniers@google.com> Link: https://lkml.kernel.org/r/YL3q1qFO9QIRL/BA@hirez.programming.kicks-ass.netSigned-off-by: NBen Hutchings <ben@decadent.org.uk> Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NLin Yujun <linyujun809@huawei.com> Reviewed-by: NZhang Jianhua <chris.zjh@huawei.com> Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
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