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Kernel + LibPthread: Use Userspace<T> in the create_thread syscall

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This commit is contained in:
Brian Gianforcaro 2020-08-05 00:11:56 -07:00 committed by Andreas Kling
parent 337e8f98cd
commit 7490ea9449
Notes: sideshowbarker 2024-07-19 04:17:43 +09:00 
Author: https://github.com/bgianfo
Commit: https://github.com/SerenityOS/serenity/commit/7490ea94494
Pull-request: https://github.com/SerenityOS/serenity/pull/2996
4 changed files with 6 additions and 6 deletions
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2
Kernel/API/Syscall.h
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@ -355,7 +355,7 @@ struct SC_create_thread_params {
unsigned int m_guard_page_size = 0; // Rounded up to PAGE_SIZE
unsigned int m_reported_guard_page_size = 0; // The lie we tell callers
unsigned int m_stack_size = 4 * MB; // Default PTHREAD_STACK_MIN
void* m_stack_location = nullptr; // nullptr means any, o.w. process virtual address
Userspace<void*> m_stack_location; // nullptr means any, o.w. process virtual address
};
struct SC_realpath_params {

2
Kernel/Process.h
View file

@ -296,7 +296,7 @@ public:
int sys$getpeername(const Syscall::SC_getpeername_params*);
int sys$sched_setparam(pid_t pid, Userspace<const struct sched_param*>);
int sys$sched_getparam(pid_t pid, Userspace<struct sched_param*>);
int sys$create_thread(void* (*)(void*), const Syscall::SC_create_thread_params*);
int sys$create_thread(void* (*)(void*), Userspace<const Syscall::SC_create_thread_params*>);
void sys$exit_thread(void*);
int sys$join_thread(int tid, void** exit_value);
int sys$detach_thread(int tid);

6
Kernel/Syscalls/thread.cpp
View file

@ -33,7 +33,7 @@
namespace Kernel {
int Process::sys$create_thread(void* (*entry)(void*), const Syscall::SC_create_thread_params* user_params)
int Process::sys$create_thread(void* (*entry)(void*), Userspace<const Syscall::SC_create_thread_params*> user_params)
{
REQUIRE_PROMISE(thread);
if (!validate_read((const void*)entry, sizeof(void*)))
@ -45,13 +45,13 @@ int Process::sys$create_thread(void* (*entry)(void*), const Syscall::SC_create_t
unsigned detach_state = params.m_detach_state;
int schedule_priority = params.m_schedule_priority;
void* stack_location = params.m_stack_location;
Userspace<void*> stack_location = params.m_stack_location;
unsigned stack_size = params.m_stack_size;
if (!validate_write(stack_location, stack_size))
return -EFAULT;
u32 user_stack_address = reinterpret_cast<u32>(stack_location) + stack_size;
u32 user_stack_address = reinterpret_cast<u32>(stack_location.ptr()) + stack_size;
if (!MM.validate_user_stack(*this, VirtualAddress(user_stack_address - 4)))
return -EFAULT;

2
Libraries/LibPthread/pthread.cpp
View file

@ -383,7 +383,7 @@ int pthread_attr_getstack(const pthread_attr_t* attributes, void** p_stack_ptr,
if (!attributes_impl || !p_stack_ptr || !p_stack_size)
return EINVAL;
*p_stack_ptr = attributes_impl->m_stack_location;
*p_stack_ptr = attributes_impl->m_stack_location.ptr();
*p_stack_size = attributes_impl->m_stack_size;
return 0;