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Kernel: Crash on memory access in non-readable regions

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This patch makes it possible to make memory regions non-readable.
This is enforced using the "present" bit in the page tables.
A process that hits an not-present page fault in a non-readable
region will be crashed.
This commit is contained in:
Andreas Kling 2019-12-02 19:14:16 +01:00
parent ddd5411472
commit f41ae755ec
5 changed files with 41 additions and 2 deletions
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Base/usr/share/man/man1/crash.md
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@ -28,6 +28,8 @@ kinds of crashes.
* `-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`: Read from recently freed memory. (Tests an opportunistic malloc guard.)
* `-y`: Write to recently freed memory. (Tests an opportunistic malloc guard.)
## Examples