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Kernel: Implement some basic stack pointer validation
VM regions can now be marked as stack regions, which is then validated on syscall, and on page fault. If a thread is caught with its stack pointer pointing into anything that's *not* a Region with its stack bit set, we'll crash the whole process with SIGSTKFLT. Userspace must now allocate custom stacks by using mmap() with the new MAP_STACK flag. This mechanism was first introduced in OpenBSD, and now we have it too, yay! :^)
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12 changed files with 101 additions and 5 deletions
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@ -26,6 +26,7 @@
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#define MAP_FIXED 0x10
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#define MAP_ANONYMOUS 0x20
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#define MAP_ANON MAP_ANONYMOUS
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#define MAP_STACK 0x40
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#define PROT_READ 0x1
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#define PROT_WRITE 0x2
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