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objtool: use gelf_getsymshndx to handle >64k sections

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Currently, objtool fails to load the correct section for symbols when
the index is greater than SHN_LORESERVE. Use gelf_getsymshndx instead
of gelf_getsym to handle >64k sections.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lkml.kernel.org/r/20200421220843.188260-2-samitolvanen@google.com
This commit is contained in:
Sami Tolvanen 2020-04-21 15:08:42 -07:00 committed by Peter Zijlstra
parent ab3852ab5c
commit 28fe1d7bf8
1 changed files with 17 additions and 7 deletions
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24
tools/objtool/elf.c
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@ -343,12 +343,14 @@ static int read_sections(struct elf *elf)
static int read_symbols(struct elf *elf)
{
struct section *symtab, *sec;
struct section *symtab, *symtab_shndx, *sec;
struct symbol *sym, *pfunc;
struct list_head *entry;
struct rb_node *pnode;
int symbols_nr, i;
char *coldstr;
Elf_Data *shndx_data = NULL;
Elf32_Word shndx;
symtab = find_section_by_name(elf, ".symtab");
if (!symtab) {
@ -356,6 +358,10 @@ static int read_symbols(struct elf *elf)
return -1;
}
symtab_shndx = find_section_by_name(elf, ".symtab_shndx");
if (symtab_shndx)
shndx_data = symtab_shndx->data;
symbols_nr = symtab->sh.sh_size / symtab->sh.sh_entsize;
for (i = 0; i < symbols_nr; i++) {
@ -369,8 +375,9 @@ static int read_symbols(struct elf *elf)
sym->idx = i;
if (!gelf_getsym(symtab->data, i, &sym->sym)) {
WARN_ELF("gelf_getsym");
if (!gelf_getsymshndx(symtab->data, shndx_data, i, &sym->sym,
&shndx)) {
WARN_ELF("gelf_getsymshndx");
goto err;
}
@ -384,10 +391,13 @@ static int read_symbols(struct elf *elf)
sym->type = GELF_ST_TYPE(sym->sym.st_info);
sym->bind = GELF_ST_BIND(sym->sym.st_info);
if (sym->sym.st_shndx > SHN_UNDEF &&
sym->sym.st_shndx < SHN_LORESERVE) {
sym->sec = find_section_by_index(elf,
sym->sym.st_shndx);
if ((sym->sym.st_shndx > SHN_UNDEF &&
sym->sym.st_shndx < SHN_LORESERVE) ||
(shndx_data && sym->sym.st_shndx == SHN_XINDEX)) {
if (sym->sym.st_shndx != SHN_XINDEX)
shndx = sym->sym.st_shndx;
sym->sec = find_section_by_index(elf, shndx);
if (!sym->sec) {
WARN("couldn't find section for symbol %s",
sym->name);