[SCM] Hurd branch, master, updated. v0.9.git20230520-21-g7abafc25

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 7abafc25f97897fd61762c45f8729fa952aa822c
Author: Sergey Bugaev <bugaevc@gmail.com>
Date:   Mon Jun 26 02:11:37 2023 +0300

    exec: Properly preallocate address space
    
    The existing code mapped the first PT_LOAD segment using anywhere=1,
    letting Mach pick an arbitrary location, and then uses anywhere=0 for
    all the remaining segments to place them next to the first one, as
    expected by the program.
    
    This, however, runs into many issues, primarily because of conflicts
    between interpreter and executable mappings. Some of those the existing
    code tried to work around. Instead, do it the way it's implemented in
    glibc: calculate upfront how much space the overall mapping will need,
    and ask Mach to preallocate this much address space. Then we deallocate
    it back, and instead map the program segments onto this very same place.
    Message-Id: <20230625231137.403096-4-bugaevc@gmail.com>

-----------------------------------------------------------------------

Summary of changes:
 exec/exec.c | 168 ++++++++++++++++++++++++------------------------------------
 1 file changed, 67 insertions(+), 101 deletions(-)


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