Kernel: Implement an axallowed mount option

Similar to `W^X` and `wxallowed`, this allows for anonymous executable mappings.
Author: https://github.com/timschumi Commit: 5efa8e507b Pull-request: https://github.com/SerenityOS/serenity/pull/13971 Reviewed-by: https://github.com/ADKaster ✅ Reviewed-by: https://github.com/Hendiadyoin1 Reviewed-by: https://github.com/bgianfo ✅ Reviewed-by: https://github.com/kleinesfilmroellchen Reviewed-by: https://github.com/linusg
2025-08-24 19:28:48 +00:00 · 2022-05-05 18:30:24 +02:00 · 2022-05-05 18:30:24 +02:00 · 5efa8e507b · 2024-07-17 09:35:47 +09:00
commit 5efa8e507b
parent 6187cf72cc
5 changed files with 8 additions and 1 deletions
--- a/Kernel/Syscalls/mmap.cpp
+++ b/Kernel/Syscalls/mmap.cpp
@ -75,7 +75,7 @@ ErrorOr<void> Process::validate_mmap_prot(int prot, bool map_stack, bool map_ano
    bool make_writable = prot & PROT_WRITE;
    bool make_executable = prot & PROT_EXEC;

-    if (map_anonymous && make_executable)
+    if (map_anonymous && make_executable && !(executable()->mount_flags() & MS_AXALLOWED))
        return EINVAL;

    if (map_stack && make_executable)