Re: [PATCH v2] ld.so: Handle read-only dynamic section gracefully [BZ #28340]

[Siddhesh Poyarekar via Libc-alpha <libc-alpha@sourceware.org>]

On 9/15/21 4:10 PM, Florian Weimer wrote:
> As far as I can tell, this does not check whether the DYNAMIC segment is
> actually covered by a read-write LOAD segment.  I wonder how much value
> this imperfect check has.

I reckon there's less value in trying to make this corner case work; I 
can't think of a reason for someone (outside of the VDSO use case) to do 
this on purpose.  Read-only DYNAMIC segments in ET_DYN objects shouldn't 
be a supported use case.

> Would it make more sense to fix the kernel linker script that generates
> those bogus vDSO reference files?

The vdso is not meant to be relocated, which is why all segments in it 
are read-only.  setup_vdso only pretends to relocate it in the interest 
of internal consistency in ld.so.

Siddhesh