Intravision/reactos
1
0
Fork 0
mirror of https://github.com/reactos/reactos.git synced 2025-08-04 12:36:51 +00:00
Code Issues Projects Releases Packages Wiki Activity

[NTOS:KE] Fix stack alignment issues

Browse source
This commit is contained in:
Timo Kreuzer 2018-03-21 10:33:31 +01:00
parent 2a2d0903bf
commit 69e8cb635a
2 changed files with 24 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

9
ntoskrnl/ke/amd64/usercall.c
View file

@ -66,7 +66,7 @@ KiInitializeUserApc(
_SEH2_TRY
{
/* Probe the context */
ProbeForWrite(Context, sizeof(CONTEXT), 16);
ProbeForWrite(Context, sizeof(CONTEXT), 16);
/* Convert the current trap frame to a context */
Context->ContextFlags = CONTEXT_FULL | CONTEXT_DEBUG_REGISTERS;
@ -253,8 +253,11 @@ KeUserModeCallback(
/* Enter a SEH Block */
_SEH2_TRY
{
/* Calculate and align the stack size */
UserArguments = (PUCHAR)ALIGN_DOWN_POINTER_BY(OldStack - ArgumentLength, sizeof(PVOID));
/* Calculate and align the stack. This is unaligned by 8 bytes, since the following
UCALLOUT_FRAME compensates for that and on entry we already have a full stack
frame with home space for the next call, i.e. we are already inside the function
body and the stack needs to be 16 byte aligned. */
UserArguments = (PUCHAR)ALIGN_DOWN_POINTER_BY(OldStack - ArgumentLength, 16) - 8;
/* The callout frame is below the arguments */
CalloutFrame = ((PUCALLOUT_FRAME)UserArguments) - 1;