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Kernel: Return ENOMEM in more places

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There are plenty of places in the kernel that aren't
checking if they actually got their allocation.

This fixes some of them, but definitely not all.

Fixes #3390
Fixes #3391

Also, let's make find_one_free_page() return nullptr
if it doesn't get a free index. This stops the kernel
crashing when out of memory and allows memory purging
to take place again.

Fixes #3487
This commit is contained in:
Luke 2020-09-16 18:47:47 +01:00 • committed by Andreas Kling
parent 2229b13c97
commit 68b361bd21
9 changed files with 34 additions and 12 deletions
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9
Kernel/Syscalls/execve.cpp
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@ -267,7 +267,10 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
// NOTE: We create the new stack before disabling interrupts since it will zero-fault
// and we don't want to deal with faults after this point.
u32 new_userspace_esp = new_main_thread->make_userspace_stack_for_main_thread(move(arguments), move(environment), move(auxv));
auto make_stack_result = new_main_thread->make_userspace_stack_for_main_thread(move(arguments), move(environment), move(auxv));
if (make_stack_result.is_error())
return make_stack_result.error();
u32 new_userspace_esp = make_stack_result.value();
if (wait_for_tracer_at_next_execve())
Thread::current()->send_urgent_signal_to_self(SIGSTOP);
@ -287,7 +290,9 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
// FIXME: PID/TID ISSUE
m_pid = new_main_thread->tid().value();
new_main_thread->make_thread_specific_region({});
auto tsr_result = new_main_thread->make_thread_specific_region({});
if (tsr_result.is_error())
return tsr_result.error();
new_main_thread->reset_fpu_state();
auto& tss = new_main_thread->m_tss;