[SCM] Hurd branch, master, updated. v0.9.git20230520-15-gbf8d582c

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit bf8d582c115e29c5c89a65d70309d5f75fca4512
Author: Sergey Bugaev <bugaevc@gmail.com>
Date:   Wed Jun 21 13:56:38 2023 +0300

    proc: Fix pointer truncation in get_string_array
    
    Due to little-endianness of x86, this resulted in a 64-bit pointers that
    pointed to the lower 4 GB of the address space being treated as a 32-bit
    pointer followed by NULL, which manifested as only the first program arg
    (the argv[0]) being visible in ps output. When a pointer pointed outside
    of the lower 4 GB, this resulted in both halves being treated as invalid
    pointers, causing proc_getprocargs () to fail with KERN_INVALID_ADDRESS,
    which manifested as ps displaying COMMAND for the affected process as ?.
    
    Found by placing all memory above the 4 GB limit, which made it apparent
    that something about fetching process command lines is seriously broken.
    
    Before:
    
        USER   PID  PPID TTY     TIME COMMAND
           0     1     1   -  0:00.00 /hurd/init
           0     2     1   -  0:00.05 /hurd/startup
           0     3     2   ?  0:02.80 ?
           0     4     2   ?  0:00.00 /hurd/proc
           0     5     2   -  0:00.08 ?
           0     6     5   -  0:00.02 ?
           0     7     2   -  0:00.00 /hurd/auth
           0     9     1   -  0:00.01 /hurd/term
           0    13     1   -  0:00.11 /hurd/mach-defpager
           0    15     1   -  0:00.00 /bin/bash
           0    16     5   -  0:00.00 /hurd/pflocal
           0    18    15   -  0:00.00 /bin/sh
           0    20    18   -  0:00.00 ps-hurd
    
    After:
    
        USER   PID  PPID TTY     TIME COMMAND
           0     1     1   -  0:00.01 /hurd/init -a
           0     2     1   -  0:00.03 /hurd/startup --kernel-task=1 console=com0
           0     3     2   ?  0:01.36 gnumach --kernel-task=1 console=com0
           0     4     2   ?  0:00.00 /hurd/proc --kernel-task=1
           0     5     2   -  0:00.06 ext2fs 
--multiboot-command-line=console=com0
           0     6     5   -  0:00.00 /hurd/exec --device-master-port=1
           0     7     2   -  0:00.02 /hurd/auth
           0     9     1   -  0:00.00 /hurd/term /dev/console device console
           0    13     1   -  0:00.09 /hurd/mach-defpager
           0    15     1   -  0:00.00 /bin/bash /usr/libexec/runsystem.hurd
           0    16     5   -  0:00.00 /hurd/pflocal
           0    18    15   -  0:00.00 /bin/sh
           0    19    18   -  0:00.01 ps-hurd -ef
    Message-Id: <20230621105638.1045306-1-bugaevc@gmail.com>

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

Summary of changes:
 proc/info.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)


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