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Kernel: Skip generic region lookup in sys$futex and sys$get_stack_bounds

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Just ask the process space directly instead of using the generic region
lookup that also checks for kernel regions.
This commit is contained in:
Andreas Kling 2021-02-08 20:14:33 +01:00
parent b31a514cce
commit b1c9f93fa3
2 changed files with 6 additions and 11 deletions
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11
Kernel/Syscalls/futex.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -25,7 +25,6 @@
*/
#include <AK/Singleton.h>
#include <AK/Time.h>
#include <Kernel/Debug.h>
#include <Kernel/Process.h>
#include <Kernel/VM/MemoryManager.h>
@ -145,9 +144,7 @@ int Process::sys$futex(Userspace<const Syscall::SC_futex_params*> user_params)
// acquiring the queue lock
RefPtr<VMObject> vmobject, vmobject2;
if (!is_private) {
if (!Kernel::is_user_range(VirtualAddress(user_address_or_offset), sizeof(u32)))
return -EFAULT;
auto region = MM.find_region_from_vaddr(space(), VirtualAddress(user_address_or_offset));
auto region = space().find_region_containing(Range { VirtualAddress { user_address_or_offset }, sizeof(u32) });
if (!region)
return -EFAULT;
vmobject = region->vmobject();
@ -157,9 +154,7 @@ int Process::sys$futex(Userspace<const Syscall::SC_futex_params*> user_params)
case FUTEX_REQUEUE:
case FUTEX_CMP_REQUEUE:
case FUTEX_WAKE_OP: {
if (!Kernel::is_user_range(VirtualAddress(user_address_or_offset2), sizeof(u32)))
return -EFAULT;
auto region2 = MM.find_region_from_vaddr(space(), VirtualAddress(user_address_or_offset2));
auto region2 = space().find_region_containing(Range { VirtualAddress { user_address_or_offset2 }, sizeof(u32) });
if (!region2)
return -EFAULT;
vmobject2 = region2->vmobject();

6
Kernel/Syscalls/get_stack_bounds.cpp
View file

@ -1,5 +1,5 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@ -25,14 +25,14 @@
*/
#include <Kernel/Process.h>
#include <Kernel/VM/MemoryManager.h>
#include <Kernel/VM/Region.h>
namespace Kernel {
int Process::sys$get_stack_bounds(FlatPtr* user_stack_base, size_t* user_stack_size)
{
FlatPtr stack_pointer = Thread::current()->get_register_dump_from_stack().userspace_esp;
auto* stack_region = MM.find_region_from_vaddr(space(), VirtualAddress(stack_pointer));
auto* stack_region = space().find_region_containing(Range { VirtualAddress(stack_pointer), 1 });
if (!stack_region) {
ASSERT_NOT_REACHED();
return -EINVAL;