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ARM: z_arch_except() is too permissive in user mode #17591

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andrewboie opened this issue Jul 16, 2019 · 0 comments · Fixed by #17815
Closed

ARM: z_arch_except() is too permissive in user mode #17591

andrewboie opened this issue Jul 16, 2019 · 0 comments · Fixed by #17815
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@ioannisg
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area: ARC ARC Architecture area: Memory Protection bug The issue is a bug, or the PR is fixing a bug priority: medium Medium impact/importance bug

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@andrewboie
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Steps to reproduce:

Pull #17589
And run tests/kernel/mem_protect/userspace
All cases need to succeed.

Right now, ARM will accept any reason code.
It should only accept kernel oops, or stack check fail. Other codes should be forced into an oops.

Impact: user mode is able to induce kernel panics, which indicate the entire system needs to be halted. user mode is also able to fake other exception types.
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@ioannisg ioannisg

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area: ARC ARC Architecture area: Memory Protection bug The issue is a bug, or the PR is fixing a bug priority: medium Medium impact/importance bug
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ARM: only allow OOPS and STACK_CHK_FAIL from user mode ioannisg/zephyr
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@ioannisg @andrewboie