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Re: [PATCH] libdw: Handle NULL dbg for call_ref, GNU_implicit_pointer and addr DW_OPs.
- From: Mark Wielaard <mjw at redhat dot com>
- To: elfutils-devel at lists dot fedorahosted dot org
- Date: Thu, 15 Jan 2015 14:13:20 +0100
- Subject: Re: [PATCH] libdw: Handle NULL dbg for call_ref, GNU_implicit_pointer and addr DW_OPs.
On Sat, 2015-01-03 at 00:25 +0100, Mark Wielaard wrote:
> afl-fuzz pointed out that __libdw_intern_expression didn't handle CFI
> containing DW_OP_call_ref, DW_OP_implicit_pointer or DW_OP_addr. Because
> in that case the Dwarf dbg is NULL. Both DW_OP_call_ref and
> DW_OP_implicit_pointer cannot be used in CFI. That is just an error.
> But DW_OP_addr can be. Without a Dwarf dbg we'll need to read the address
> argument directly. Don't use __libdw_read_address_inc which might do a
> relocation of the value read. But in practice the relocation hook isn't
> implemented anyway.
> Signed-off-by: Mark Wielaard <firstname.lastname@example.org>
I pushed this to master.