@@ -195,6 +195,7 @@ struct bpf_object {
Elf *elf;
GElf_Ehdr ehdr;
Elf_Data *symbols;
+ size_t strtabidx;
struct {
GElf_Shdr shdr;
Elf_Data *data;
@@ -547,7 +548,7 @@ bpf_object__init_maps_name(struct bpf_object *obj, int maps_shndx)
continue;
map_name = elf_strptr(obj->efile.elf,
- obj->efile.ehdr.e_shstrndx,
+ obj->efile.strtabidx,
sym.st_name);
map_idx = sym.st_value / sizeof(struct bpf_map_def);
if (map_idx >= obj->nr_maps) {
@@ -630,8 +631,10 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
pr_warning("bpf: multiple SYMTAB in %s\n",
obj->path);
err = -LIBBPF_ERRNO__FORMAT;
- } else
+ } else {
obj->efile.symbols = data;
+ obj->efile.strtabidx = sh.sh_link;
+ }
} else if ((sh.sh_type == SHT_PROGBITS) &&
(sh.sh_flags & SHF_EXECINSTR) &&
(data->d_size > 0)) {
@@ -667,6 +670,10 @@ static int bpf_object__elf_collect(struct bpf_object *obj)
goto out;
}
+ if (!obj->efile.strtabidx || obj->efile.strtabidx >= idx) {
+ pr_warning("Corrupted ELF file: index of strtab invalid\n");
+ return LIBBPF_ERRNO__FORMAT;
+ }
if (maps_shndx >= 0)
err = bpf_object__init_maps_name(obj, maps_shndx);
out:
Namhyung Kim pointed out a potential problem in original code that it fetches names of maps from section header string table, which is used to store section names. Original code doesn't cause error because of a LLVM behavior that, it combines shstrtab into strtab. For example: $ echo 'int func() {return 0;}' | x86_64-oe-linux-clang -x c -o temp.o -c - $ readelf -h ./temp.o ELF Header: Magic: 7f 45 4c 46 02 01 01 03 00 00 00 00 00 00 00 00 ... Section header string table index: 1 $ readelf -S ./temp.o There are 10 section headers, starting at offset 0x288: Section Headers: [Nr] Name Type Address Offset Size EntSize Flags Link Info Align [ 0] NULL 0000000000000000 00000000 0000000000000000 0000000000000000 0 0 0 [ 1] .strtab STRTAB 0000000000000000 00000230 0000000000000051 0000000000000000 0 0 1 ... $ readelf -p .strtab ./temp.o String dump of section '.strtab': [ 1] .text [ 7] .comment [ 10] .bss [ 15] .note.GNU-stack [ 25] .rela.eh_frame [ 34] func [ 39] .strtab [ 41] .symtab [ 49] .data [ 4f] - $ readelf -p .shstrtab ./temp.o readelf: Warning: Section '.shstrtab' was not dumped because it does not exist! Where, 'section header string table index' points to '.strtab', and symbol names are also stored there. However, in case of gcc: $ echo 'int func() {return 0;}' | gcc -x c -o temp.o -c - $ readelf -p .shstrtab ./temp.o String dump of section '.shstrtab': [ 1] .symtab [ 9] .strtab [ 11] .shstrtab [ 1b] .text [ 21] .data [ 27] .bss [ 2c] .comment [ 35] .note.GNU-stack [ 45] .rela.eh_frame $ readelf -p .strtab ./temp.o String dump of section '.strtab': [ 1] func They are separated sections. Although original code doesn't cause error, we'd better use canonical method for fetching symbol names to avoid potential behavior changing. This patch learns from readelf's code, fetches string from sh_link of .symbol section. Reported-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Wang Nan <wangnan0@huawei.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/lib/bpf/libbpf.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) -- 1.8.3.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/