From 40e1d303cedca7d67f6219686f06b9750659beab Mon Sep 17 00:00:00 2001 From: Alan Modra Date: Sat, 3 Jul 2021 09:38:40 +0930 Subject: PR28047, readelf crash due to assertion failure DW_FORM_ref1, DW_FORM_ref2, DW_FORM_ref4, DW_FORM_ref1, and DW_FORM_ref_udata are all supposed to be within the containing unit. PR 28047 * dwarf.c (get_type_abbrev_from_form): Add cu_end parameter. Check DW_FORM_ref1 etc. arg against cu_end rather than end of section. Adjust all callers. --- binutils/ChangeLog | 7 +++++++ binutils/dwarf.c | 16 ++++++++++------ 2 files changed, 17 insertions(+), 6 deletions(-) diff --git a/binutils/ChangeLog b/binutils/ChangeLog index 9efa39e..77b7ac7 100644 --- a/binutils/ChangeLog +++ b/binutils/ChangeLog @@ -1,3 +1,10 @@ +2021-07-05 Alan Modra + + PR 28047 + * dwarf.c (get_type_abbrev_from_form): Add cu_end parameter. + Check DW_FORM_ref1 etc. arg against cu_end rather than end of + section. Adjust all callers. + 2021-07-03 Nick Clifton * configure: Regenerate. diff --git a/binutils/dwarf.c b/binutils/dwarf.c index 1e7f4db..ad1ee97 100644 --- a/binutils/dwarf.c +++ b/binutils/dwarf.c @@ -2066,6 +2066,7 @@ static abbrev_entry * get_type_abbrev_from_form (unsigned long form, unsigned long uvalue, dwarf_vma cu_offset, + unsigned char *cu_end, const struct dwarf_section *section, unsigned long *abbrev_num_return, unsigned char **data_return, @@ -2106,10 +2107,10 @@ get_type_abbrev_from_form (unsigned long form, case DW_FORM_ref4: case DW_FORM_ref8: case DW_FORM_ref_udata: - if (uvalue + cu_offset > section->size) + if (uvalue + cu_offset > (size_t) (cu_end - section->start)) { - warn (_("Unable to resolve ref form: uvalue %lx + cu_offset %lx > section size %lx\n"), - uvalue, (long) cu_offset, (long) section->size); + warn (_("Unable to resolve ref form: uvalue %lx + cu_offset %lx > CU size %lx\n"), + uvalue, (long) cu_offset, (long) (cu_end - section->start)); return NULL; } uvalue += cu_offset; @@ -2225,6 +2226,7 @@ get_type_signedness (abbrev_entry *entry, type_abbrev = get_type_abbrev_from_form (attr->form, uvalue, cu_offset, + end, section, NULL /* abbrev num return */, &type_data, @@ -2963,8 +2965,10 @@ read_and_display_attr_value (unsigned long attribute, unsigned char *type_data; abbrev_map *map; - type_abbrev = get_type_abbrev_from_form (form, uvalue, cu_offset, - section, NULL, &type_data, &map); + type_abbrev = get_type_abbrev_from_form (form, uvalue, + cu_offset, end, + section, NULL, + &type_data, &map); if (type_abbrev != NULL) { get_type_signedness (type_abbrev, section, type_data, @@ -3297,7 +3301,7 @@ read_and_display_attr_value (unsigned long attribute, unsigned long abbrev_number; abbrev_entry *entry; - entry = get_type_abbrev_from_form (form, uvalue, cu_offset, + entry = get_type_abbrev_from_form (form, uvalue, cu_offset, end, section, & abbrev_number, NULL, NULL); if (entry == NULL) { -- cgit v1.1