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crash: Check whether the msyscall mitigation actually works

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Ben Wiederhake 2021-03-12 22:18:45 +01:00 • committed by Brian Gianforcaro
parent f8ea730f29
commit e8d37b7b17
1 changed files with 10 additions and 0 deletions
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10
Userland/Utilities/crash.cpp
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@ -42,6 +42,7 @@ int main(int argc, char** argv)
bool do_invalid_stack_pointer_on_syscall = false;
bool do_invalid_stack_pointer_on_page_fault = false;
bool do_syscall_from_writeable_memory = false;
bool do_legitimate_syscall = false;
bool do_execute_non_executable_memory = false;
bool do_trigger_user_mode_instruction_prevention = false;
bool do_use_io_instruction = false;
@ -67,6 +68,7 @@ int main(int argc, char** argv)
args_parser.add_option(do_invalid_stack_pointer_on_syscall, "Make a syscall while using an invalid stack pointer", nullptr, 'T');
args_parser.add_option(do_invalid_stack_pointer_on_page_fault, "Trigger a page fault while using an invalid stack pointer", nullptr, 't');
args_parser.add_option(do_syscall_from_writeable_memory, "Make a syscall from writeable memory", nullptr, 'S');
args_parser.add_option(do_legitimate_syscall, "Make a syscall from legitimate memory (but outside msyscall)", nullptr, 'y');
args_parser.add_option(do_execute_non_executable_memory, "Attempt to execute non-executable memory (not mapped with PROT_EXEC)", nullptr, 'X');
args_parser.add_option(do_trigger_user_mode_instruction_prevention, "Attempt to trigger an x86 User Mode Instruction Prevention fault", nullptr, 'U');
args_parser.add_option(do_use_io_instruction, "Use an x86 I/O instruction in userspace", nullptr, 'I');
@ -227,6 +229,14 @@ int main(int argc, char** argv)
}).run(run_type);
}
if (do_legitimate_syscall || do_all_crash_types) {
Crash("Regular syscall from outside msyscall", []() {
// Since 'crash' is dynamically linked, and DynamicLoader only allows LibSystem to make syscalls, this should kill us:
Syscall::invoke(Syscall::SC_getuid);
return Crash::Failure::DidNotCrash;
}).run(run_type);
}
if (do_execute_non_executable_memory || do_all_crash_types) {
Crash("Execute non executable memory", []() {
auto* ptr = (u8*)mmap(nullptr, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0);