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Kernel: Allow SYS_EXEC to fail at any point

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This patch builds new executable image to another pml4 structure and
only after everything is validated will current context be replaced.
This allows exec to fail "late" where previously it would panic the
kernel or kill the process. This allows graceful handling of exec
failures in userspace!
This commit is contained in:
Bananymous
2024-09-24 16:29:38 +03:00
parent ebb87ccdde
commit 39802b56c1
3 changed files with 73 additions and 39 deletions
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8
kernel/include/kernel/Thread.h
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@@ -32,7 +32,7 @@ namespace Kernel
public:
static BAN::ErrorOr<Thread*> create_kernel(entry_t, void*, Process*);
static BAN::ErrorOr<Thread*> create_userspace(Process*);
static BAN::ErrorOr<Thread*> create_userspace(Process*, PageTable&);
~Thread();
BAN::ErrorOr<Thread*> clone(Process*, uintptr_t sp, uintptr_t ip);
@@ -72,6 +72,8 @@ namespace Kernel
static Thread& current();
static pid_t current_tid();
void give_keep_alive_page_table(BAN::UniqPtr<PageTable>&& page_table) { m_keep_alive_page_table = BAN::move(page_table); }
Process& process();
const Process& process() const;
bool has_process() const { return m_process; }
@@ -99,6 +101,10 @@ namespace Kernel
void on_exit();
private:
// NOTE: this is the first member to force it being last destructed
// {kernel,userspace}_stack has to be destroyed before page table
BAN::UniqPtr<PageTable> m_keep_alive_page_table;
static constexpr size_t m_kernel_stack_size { PAGE_SIZE * 64 };
static constexpr size_t m_userspace_stack_size { PAGE_SIZE * 64 };
BAN::UniqPtr<VirtualRange> m_kernel_stack;