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Date: Tue, 21 Apr 2020 11:07:22 -0700 From: Sami Tolvanen <samitolvanen@...gle.com> To: Josh Poimboeuf <jpoimboe@...hat.com>, Peter Zijlstra <peterz@...radead.org> Cc: Kees Cook <keescook@...omium.org>, linux-kernel@...r.kernel.org, Sami Tolvanen <samitolvanen@...gle.com> Subject: [PATCH 1/3] objtool: use gelf_getsymshndx to handle >64k sections 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@...gle.com> --- tools/objtool/elf.c | 24 +++++++++++++++++------- 1 file changed, 17 insertions(+), 7 deletions(-) diff --git a/tools/objtool/elf.c b/tools/objtool/elf.c index 09ddc8f1def3..887445e87380 100644 --- a/tools/objtool/elf.c +++ b/tools/objtool/elf.c @@ -327,12 +327,14 @@ 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) { @@ -340,6 +342,10 @@ 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++) { @@ -353,8 +359,9 @@ 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; } @@ -368,10 +375,13 @@ 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); -- 2.26.1.301.g55bc3eb7cb9-goog
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