[PATCH] kernel32: Fill stack with meaningful values in call_process_entry mis-align workaround.

André Hentschel nerv at dawncrow.de
Sun Jul 8 14:19:56 CDT 2018


From: Sebastian Lackner <sebastian at fds-team.de>

Signed-off-by: André Hentschel <nerv at dawncrow.de>
---
 dlls/kernel32/process.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/dlls/kernel32/process.c b/dlls/kernel32/process.c
index ff56e9a..7787a32 100644
--- a/dlls/kernel32/process.c
+++ b/dlls/kernel32/process.c
@@ -1042,7 +1042,9 @@ __ASM_GLOBAL_FUNC( call_process_entry,
                     __ASM_CFI(".cfi_rel_offset %ebp,0\n\t")
                     "movl %esp,%ebp\n\t"
                     __ASM_CFI(".cfi_def_cfa_register %ebp\n\t")
-                    "subl $12,%esp\n\t"  /* deliberately mis-align the stack by 8, Doom 3 needs this */
+                    "pushl 4(%ebp)\n\t"  /* deliberately mis-align the stack by 8, Doom 3 needs this */
+                    "pushl 4(%ebp)\n\t"  /* Driller expects readable address at this offset */
+                    "pushl 4(%ebp)\n\t"
                     "pushl 8(%ebp)\n\t"
                     "call *12(%ebp)\n\t"
                     "leave\n\t"
-- 
2.7.4




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