[PATCH 1/3] elf: load the main program from AT_EXECFD when run as a binfmt interpreter

[Christian Brauner]

On 2026-07-15 13:10 +0200, Florian Weimer wrote:
> * Christian Brauner:
> 
> > +struct link_map *
> > +_dl_map_object_execfd (int fd, const char *name)
> > +{
> > +  struct filebuf fb;
> > +  bool found_other_class = false;
> > +
> > +  /* The kernel hands over the descriptor with the file position at
> > +     zero, but an explicit loader invocation need not; the header check
> > +     in open_verify reads sequentially.  */
> > +  __lseek (fd, 0, SEEK_SET);
> 
> This does not seem quite right.  If we need to deal with weird file
> pointers in shared files, we can't use read(v) for reading data, and
> would have to use pread(v) instead.

Yes, I'll switch to pread().