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Kernel, libc: Add setuid() and setgid() system calls

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apio 2022-10-28 17:19:26 +02:00
parent 2269ec267c
commit 1c4f1ab867
5 changed files with 59 additions and 1 deletions
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4
kernel/include/sys/Syscall.h
View File

@ -28,6 +28,8 @@
#define SYS_getdents 22
#define SYS_stat 23
#define SYS_dup2 24
#define SYS_setuid 25
#define SYS_setgid 26
struct stat;
struct pstat;
@ -63,3 +65,5 @@ void sys_pstat(Context* context, long pid, struct pstat* buf);
void sys_getdents(Context* context, int fd, struct luna_dirent* buf, size_t count);
void sys_stat(Context* context, const char* path, struct stat* buf);
void sys_dup2(Context* context, int fd, int fd2);
void sys_setuid(Context* context, int new_uid, int new_euid);
void sys_setgid(Context* context, int new_gid, int new_egid);

2
kernel/src/sys/Syscall.cpp
View File

@ -38,6 +38,8 @@ void Syscall::entry(Context* context)
sys_getdents(context, (int)context->rdi, (struct luna_dirent*)context->rsi, (size_t)context->rdx);
break;
case SYS_dup2: sys_dup2(context, (int)context->rdi, (int)context->rsi); break;
case SYS_setuid: sys_setuid(context, (int)context->rdi, (int)context->rsi); break;
case SYS_setgid: sys_setgid(context, (int)context->rdi, (int)context->rsi); break;
default: context->rax = -ENOSYS; break;
}
VMM::exit_syscall_context();

48
kernel/src/sys/id.cpp
View File

@ -46,3 +46,51 @@ void sys_getprocid(Context* context, int field)
return;
}
}
void sys_setuid(Context* context, int new_uid, int new_euid)
{
Task* current_task = Scheduler::current_task();
if (!current_task->is_superuser())
{
if (new_uid != current_task->uid && new_uid != current_task->euid)
{
context->rax = -EPERM;
return;
}
if (new_euid != current_task->euid && new_euid != current_task->uid)
{
context->rax = -EPERM;
return;
}
}
current_task->uid = new_uid;
current_task->euid = new_euid;
context->rax = 0;
}
void sys_setgid(Context* context, int new_gid, int new_egid)
{
Task* current_task = Scheduler::current_task();
if (!current_task->is_superuser())
{
if (new_gid != current_task->gid && new_gid != current_task->egid)
{
context->rax = -EPERM;
return;
}
if (new_egid != current_task->egid && new_egid != current_task->gid)
{
context->rax = -EPERM;
return;
}
}
current_task->gid = new_gid;
current_task->egid = new_egid;
context->rax = 0;
}

2
libs/libc/include/sys/syscall.h
View File

@ -26,5 +26,7 @@
#define SYS_getdents 22
#define SYS_stat 23
#define SYS_dup2 24
#define SYS_setuid 25
#define SYS_setgid 26
#endif

2
libs/libc/src/syscall.cpp
View File

@ -26,6 +26,8 @@ extern "C" long syscall(long number, ...)
case SYS_fstat:
case SYS_stat:
case SYS_dup2:
case SYS_setuid:
case SYS_setgid:
case SYS_pstat: {
arg arg0 = va_arg(ap, arg);
arg arg1 = va_arg(ap, arg);