Hi,
On Mon, 2014-06-09 at 21:05 +0200, Thilo Schulz wrote:
When adding data to existing sections in ELF files, libelf may
corrupt
those sections, i.e. overwrite the existing data if certain conditions are
met.
If an Elf_Scn structure has seen a call to elf_rawdata(scn) before but no
call to elf_getdata(scn), scn->read_data flag is set, but not
scn->data_list_rear.
Do you happen to have a small testcase that shows the buggy behavior?
Thus, elf_newdata(scn) incorrectly detects a "new user added
section" when
really it is a section with live, valid data that will be overwritten by
elf_update(), corrupting the section.
This patch fixes this incorrect behaviour.
I was wondering whether we want to check scn->rawdata.s directly, or if
we could rely on ELF_F_FILEDATA being set for scn->flags?
Thanks,
Mark