Kernel: Send SIGBUS to threads that use after valid Inode mmaped range

According to Dr. POSIX, we should allow to call mmap on inodes even on ranges that currently don't map to any actual data. Trying to read or write to those ranges should result in SIGBUS being sent to the thread that did violating memory access.
Author: https://github.com/supercomputer7 Commit: 0c675192c9 Pull-request: https://github.com/SerenityOS/serenity/pull/14785 Reviewed-by: https://github.com/IdanHo ✅
2025-09-08 02:26:10 +00:00 · 2022-08-07 22:08:52 +03:00 · 2022-08-07 22:08:52 +03:00 · 0c675192c9 · 2024-07-17 10:05:47 +09:00
commit 0c675192c9
parent 3ad0e1a1d5
4 changed files with 57 additions and 33 deletions
--- a/Kernel/Memory/PageFaultResponse.h
+++ b/Kernel/Memory/PageFaultResponse.h
@ -10,6 +10,7 @@ namespace Kernel {

 enum class PageFaultResponse {
    ShouldCrash,
+    BusError,
    OutOfMemory,
    Continue,
 };