On Mon, 2023-03-06 at 19:09 +0100, Borislav Petkov wrote:

quoted

diff --git a/arch/x86/kernel/sys_x86_64.c

b/arch/x86/kernel/sys_x86_64.c
index 8cc653ffdccd..06378b5682c1 100644

--- a/arch/x86/kernel/sys_x86_64.c
+++ b/arch/x86/kernel/sys_x86_64.c

@@ -193,7 +193,11 @@ arch_get_unmapped_area_topdown(struct file

*filp, const unsigned long addr0,
  
       info.flags = VM_UNMAPPED_AREA_TOPDOWN;
       info.length = len;
-     info.low_limit = PAGE_SIZE;
+     if (!in_32bit_syscall() && (flags & MAP_ABOVE4G))
+             info.low_limit = 0x100000000;

We have a human readable define for that: SZ_4G

Uhh, yes that's much better. And the typos. Thanks.