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Kernel: Implement an axallowed mount option

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Similar to `W^X` and `wxallowed`, this allows for anonymous executable
mappings.
This commit is contained in:
Tim Schumacher 2022-05-05 18:30:24 +02:00 • committed by Brian Gianforcaro
parent 6187cf72cc
commit 5efa8e507b
5 changed files with 8 additions and 1 deletions
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1
Kernel/API/POSIX/unistd.h
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@ -28,6 +28,7 @@ extern "C" {
#define MS_RDONLY (1 << 4)
#define MS_REMOUNT (1 << 5)
#define MS_WXALLOWED (1 << 6)
#define MS_AXALLOWED (1 << 7)
enum {
_SC_MONOTONIC_CLOCK,

2
Kernel/Syscalls/mmap.cpp
View file

@ -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)