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Kernel: Implement some basic stack pointer validation

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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! :^)
This commit is contained in:
Andreas Kling 2019-11-17 12:11:43 +01:00
parent 197ed1bb2a
commit 794758df3a
12 changed files with 101 additions and 5 deletions
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2
Kernel/Arch/i386/CPU.h
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@ -193,6 +193,7 @@ static_assert(sizeof(PageDirectoryEntry) == 4);
static_assert(sizeof(PageTableEntry) == 4);
class IRQHandler;
struct RegisterDump;
void gdt_init();
void idt_init();
@ -208,6 +209,7 @@ u16 gdt_alloc_entry();
void gdt_free_entry(u16);
Descriptor& get_gdt_entry(u16 selector);
void write_gdt_entry(u16 selector, Descriptor&);
void handle_crash(RegisterDump&, const char* description, int signal);
[[noreturn]] static inline void hang()
{