[bug #48946] exec server can't properly load binaries without a memory manager object

[Brent Baccala]

URL:
  <http://savannah.gnu.org/bugs/?48946>

                 Summary: exec server can't properly load binaries without a
memory manager object
                 Project: The GNU Hurd
            Submitted by: baccala
            Submitted on: Tue 30 Aug 2016 01:46:17 AM GMT
                Category: Hurd Servers
                Severity: 3 - Normal
                Priority: 5 - Normal
              Item Group: None
                  Status: None
                 Privacy: Public
             Assigned to: None
         Originator Name: 
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
         Reproducibility: Every Time
              Size (loc): None
         Planned Release: None
                  Effort: 0.00
Wiki-like text discussion box: 

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Details:

When exec'ing a file, the exec server attempts to obtain a memory object to
the file with io_map, and then maps this object into the new task's memory
space.  If this fails, it then attempts to fall back on reading the file
normally, then copying the data into the new task's memory space.

Both of these cases need to respect the 'anywhere' flag, which indicates that
a memory mapping can be placed anywhere in the new task's address space and
that the kernel will return the address actually used.

The fallback code currently does not handle 'anywhere' mappings correctly; it
discards the new address and attempts to use the old one, which prevents
successful execution of the binary.

The attached patch fixes the fallback code.




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File Attachments:


-------------------------------------------------------
Date: Tue 30 Aug 2016 01:46:17 AM GMT  Name: exec.patch  Size: 3kB   By:
baccala

<http://savannah.gnu.org/bugs/download.php?file_id=38385>

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