[PATCH 2/2] ntdll: Clear the first two stack pages in signal_start_thread.
Rémi Bernon
rbernon at codeweavers.com
Tue Mar 30 12:24:32 CDT 2021
Instead of the whole stack, except for the last one or two pages.
Signed-off-by: Rémi Bernon <rbernon at codeweavers.com>
---
dlls/ntdll/signal_i386.c | 5 ++---
dlls/ntdll/signal_x86_64.c | 6 ++----
2 files changed, 4 insertions(+), 7 deletions(-)
diff --git a/dlls/ntdll/signal_i386.c b/dlls/ntdll/signal_i386.c
index 635b8f4de81..cb04206343a 100644
--- a/dlls/ntdll/signal_i386.c
+++ b/dlls/ntdll/signal_i386.c
@@ -507,9 +507,8 @@ __ASM_GLOBAL_FUNC( signal_start_thread,
"leal -12(%esi),%ecx\n\t"
/* clear the thread stack */
"andl $~0xfff,%ecx\n\t" /* round down to page size */
- "movl %fs:8,%edi\n\t" /* NtCurrentTeb()->Tib.StackLimit */
- "addl $0x1000,%edi\n\t"
- "movl %edi,%esp\n\t"
+ "movl %ecx,%edi\n\t"
+ "subl $0x2000,%edi\n\t"
"subl %edi,%ecx\n\t"
"xorl %eax,%eax\n\t"
"shrl $2,%ecx\n\t"
diff --git a/dlls/ntdll/signal_x86_64.c b/dlls/ntdll/signal_x86_64.c
index b5be4f35758..418b3dbba25 100644
--- a/dlls/ntdll/signal_x86_64.c
+++ b/dlls/ntdll/signal_x86_64.c
@@ -1540,10 +1540,8 @@ __ASM_GLOBAL_FUNC( signal_start_thread,
"movq %rcx,%rbx\n\t" /* context */
/* clear the thread stack */
"andq $~0xfff,%rcx\n\t" /* round down to page size */
- "movq %gs:0x30,%rax\n\t"
- "movq 0x10(%rax),%rdi\n\t" /* NtCurrentTeb()->Tib.StackLimit */
- "addq $0x2000,%rdi\n\t"
- "movq %rdi,%rsp\n\t"
+ "movq %rcx,%rdi\n\t"
+ "subq $0x2000,%rdi\n\t"
"subq %rdi,%rcx\n\t"
"xorl %eax,%eax\n\t"
"shrq $3,%rcx\n\t"
--
2.30.2
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