Name

crash - intentionally perform an illegal operation

Synopsis

$ /usr/Tests/Kernel/crash [options]

Description

This program is used to test how the Serenity kernel or UserspaceEmulator handle userspace crashes, and can be used to simulate many different kinds of crashes.

Options

• -A: Test that all of the following crash types crash as expected.
• -s: Perform a segmentation violation by dereferencing an invalid pointer.
• -d: Perform a division by zero.
• -i: Execute an illegal CPU instruction.
• -a: Call abort().
• -m: Read a pointer from uninitialized malloc memory, then read from it.
• -f: Read a pointer from memory freed using free(), then read from it.
• -M: Read a pointer from uninitialized malloc memory, then write to it.
• -F: Read a pointer from memory freed using free(), then write to it.
• -r: Write to read-only memory.
• -T: Make a syscall while using an invalid stack pointer.
• -t: Trigger a page fault while using an invalid stack pointer.
• -S: Make a syscall from writeable memory.
• -X: Attempt to execute non-executable memory (Not mapped with PROT_EXEC).
• -U: Attempt to trigger an x86 User Mode Instruction Prevention fault.
• -I: Use an x86 I/O instruction in userspace.
• -c: Read the x86 TSC (Time Stamp Counter) directly.
• -p: Violate pledge()'d promises.
• -n: Perform a failing assertion.

Examples

$ crash -F
Testing: "Write to freed memory"
Shell: Job 1 (crash -F) Segmentation violation