libdwfl: Make sure there is at least one dynamic entry
Commit Message
The buffer read in needs to contain room for at least one Elf32_Dyn or
Elf64_Dyn entry.
Signed-off-by: Mark Wielaard <mark@klomp.org>
---
libdwfl/ChangeLog | 5 +++++
libdwfl/link_map.c | 5 +++++
2 files changed, 10 insertions(+)
@@ -1,3 +1,8 @@
+2021-12-16 Mark Wielaard <mark@klomp.org>
+
+ * link_map.c (dwfl_link_map_report): Make sure dyn_filesz / entsize is
+ non-zero.
+
2021-12-08 Mark Wielaard <mark@klomp.org>
* dwfl_segment_report_module.c (dwfl_segment_report_module): Add
@@ -1017,6 +1017,11 @@ dwfl_link_map_report (Dwfl *dwfl, const void *auxv, size_t auxv_size,
in.d_size. The data might have been truncated. */
if (dyn_filesz > in.d_size)
dyn_filesz = in.d_size;
+ if (dyn_filesz / entsize == 0)
+ {
+ __libdwfl_seterrno (DWFL_E_BADELF);
+ return false;
+ }
void *buf = malloc (dyn_filesz);
Elf32_Dyn (*d32)[dyn_filesz / sizeof (Elf32_Dyn)] = buf;
Elf64_Dyn (*d64)[dyn_filesz / sizeof (Elf64_Dyn)] = buf;