[SCM] GNU Mach branch, master, updated. v1.8-654-g5e597575

[Samuel Thibault]

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- Log -----------------------------------------------------------------
commit 5e597575b78af2464117437c8bc41e632d7e112d
Author: Luca Dariz <luca@orpolo.org>
Date:   Sat Jun 17 23:17:54 2023 +0200

    x86_64: add a critical section on entry and exit from syscall/sysret
    
    When entering a syscall we're still using the user stack, so we can't
    reliably handle exceptions or interrupts, otherwise a user thread can
    easily crash the machine with an invalid stack. Instead, disable
    interrupts and (hopefullly) avoid traps in the fragments where we need
    to have the user stack in RSP.
    
    * i386/i386/ldt.c: mask interrupts and IOPL on syscall entry
    * x86_64/locore.S: keep interrupts disabled when we use the user stack

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

Summary of changes:
 i386/i386/ldt.c | 3 ++-
 x86_64/locore.S | 4 +++-
 2 files changed, 5 insertions(+), 2 deletions(-)


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