[exim-dev] [Bug 3081] New: Segfault if errors_to is used wit…

https://bugs.exim.org/show_bug.cgi?id=3081

            Bug ID: 3081
           Summary: Segfault if errors_to is used with a fixed address
           Product: Exim
           Version: N/A
          Hardware: x86
                OS: Linux
            Status: NEW
          Severity: bug
          Priority: medium
         Component: Address Rewriting
          Assignee: unallocated@???
          Reporter: pjb1008@???
                CC: exim-dev@???

Created attachment 1475
--> https://bugs.exim.org/attachment.cgi?id=1475&action=edit
Extract local part and domain without modifying original string

Hi,

If errors_to is used with a fixed address, and mprotect is used to stop the
config being overwritten, then the address parsing code in rewrite_one() will
segfault.

This is because it temporarily replaces @ with NUL to extract the local part of
the address, but this is not possible if the config is protected.

Peter

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