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[NTOS:KE/x64] Loop in KiInitiateUserApc

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This is required since while interrupts are enabled, another user APC could get queued and we want to guarantee that those are all delivered before returning to user mode.
This commit is contained in:
Timo Kreuzer 2024-03-25 22:23:19 +02:00
parent e3bfcdf9e2
commit 36fa628605
1 changed files with 11 additions and 5 deletions
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14
ntoskrnl/ke/amd64/trap.S
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@ -1150,21 +1150,27 @@ PUBLIC KiInitiateUserApc
mov rax, APC_LEVEL mov rax, APC_LEVEL
mov cr8, rax mov cr8, rax
/* Get the current thread */
mov rbp, gs:[PcCurrentThread]
deliver_apcs:
/* Enable interrupts */ /* Enable interrupts */
sti sti
/* Get the current trap frame */
mov rax, gs:[PcCurrentThread]
mov r8, [rax + KTHREAD_TrapFrame]
/* Call the C function */ /* Call the C function */
mov ecx, 1 mov ecx, 1
mov rdx, rsp mov rdx, rsp
mov r8, [rbp + ThTrapFrame]
call KiDeliverApc call KiDeliverApc
/* Disable interrupts again */ /* Disable interrupts again */
cli cli
/* Check if there are more APCs to deliver */
cmp byte ptr [rbp + ThApcState + AsUserApcPending], 0
jne deliver_apcs
/* Go back to PASSIVE_LEVEL */ /* Go back to PASSIVE_LEVEL */
mov rax, PASSIVE_LEVEL mov rax, PASSIVE_LEVEL
mov cr8, rax mov cr8, rax