[reactos] 01/02: [NTOS:MM] Acquire MmSystemLoadLock in MiFindInitializationCode. CORE-16449

[Thomas Faber]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=a30edc324e5a3c265d01d3...

commit a30edc324e5a3c265d01d345bf33786faa6ae727
Author:     Thomas Faber [e-mail]
AuthorDate: Thu Oct 15 13:40:42 2020 +0200
Commit:     Thomas Faber [e-mail]
CommitDate: Thu Oct 15 14:49:11 2020 +0200

[NTOS:MM] Acquire MmSystemLoadLock in MiFindInitializationCode. CORE-16449

We might otherwise free the INIT section for an image that's in the
    process of being loaded by Mm.
---
 ntoskrnl/mm/ARM3/sysldr.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/ntoskrnl/mm/ARM3/sysldr.c b/ntoskrnl/mm/ARM3/sysldr.c
index c66f06c4fe8..92a31896205 100644
--- a/ntoskrnl/mm/ARM3/sysldr.c
+++ b/ntoskrnl/mm/ARM3/sysldr.c
@@ -1466,8 +1466,13 @@ MiFindInitializationCode(OUT PVOID *StartVa,
     /* Assume failure */
     *StartVa = NULL;

-    /* Enter a critical region while we loop the list */
+    /* Acquire the necessary lock while we loop the list */
     KeEnterCriticalRegion();
+    KeWaitForSingleObject(&MmSystemLoadLock,
+                          WrVirtualMemory,
+                          KernelMode,
+                          FALSE,
+                          NULL);

/* Loop all loaded modules */
     NextEntry = PsLoadedModuleList.Flink;
@@ -1615,7 +1620,8 @@ MiFindInitializationCode(OUT PVOID *StartVa,
         NextEntry = NextEntry->Flink;
     }

-    /* Leave the critical region and return */
+    /* Release the lock and return */
+    KeReleaseMutant(&MmSystemLoadLock, 1, FALSE, FALSE);
     KeLeaveCriticalRegion();
 }