An invalid or trucated debug info/type section could cause the cu endp to point beyond the end of section data.
Signed-off-by: Mark Wielaard <[email protected]> --- libdw/ChangeLog | 4 ++++ libdw/libdw_findcu.c | 6 ++++++ 2 files changed, 10 insertions(+) diff --git a/libdw/ChangeLog b/libdw/ChangeLog index 8b00970..8d27b8d 100644 --- a/libdw/ChangeLog +++ b/libdw/ChangeLog @@ -1,5 +1,9 @@ 2014-12-11 Mark Wielaard <[email protected]> + * libdw_findcu.c (__libdw_intern_next_unit): Sanity check offset. + +2014-12-11 Mark Wielaard <[email protected]> + * dwarf_child.c (__libdw_find_attr): Call __libdw_form_val_len with die->cu->endp, not the abbrev endp. * dwarf_getattrs.c (dwarf_getattrs): Likewise. diff --git a/libdw/libdw_findcu.c b/libdw/libdw_findcu.c index 3c9633e..c783ff8 100644 --- a/libdw/libdw_findcu.c +++ b/libdw/libdw_findcu.c @@ -94,6 +94,12 @@ __libdw_intern_next_unit (dbg, debug_types) return NULL; } + /* Invalid or truncated debug section data? */ + Elf_Data *data = dbg->sectiondata[debug_types + ? IDX_debug_types : IDX_debug_info]; + if (unlikely (*offsetp > data->d_size)) + *offsetp = data->d_size; + /* Create an entry for this CU. */ struct Dwarf_CU *newp = libdw_typed_alloc (dbg, struct Dwarf_CU); -- 2.1.0
