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Kernel: Add some missing error checks to the setpgid() syscall

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This commit is contained in:
Andreas Kling 2020-01-02 19:40:04 +01:00
parent 7cdfb9c6b4
commit 9fe316c2d8
1 changed files with 19 additions and 1 deletions
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20
Kernel/Process.cpp
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@ -2117,11 +2117,29 @@ int Process::sys$setpgid(pid_t specified_pid, pid_t specified_pgid)
{ {
InterruptDisabler disabler; // FIXME: Use a ProcessHandle InterruptDisabler disabler; // FIXME: Use a ProcessHandle
pid_t pid = specified_pid ? specified_pid : m_pid; pid_t pid = specified_pid ? specified_pid : m_pid;
if (specified_pgid < 0) if (specified_pgid < 0) {
// The value of the pgid argument is less than 0, or is not a value supported by the implementation.
return -EINVAL; return -EINVAL;
}
auto* process = Process::from_pid(pid); auto* process = Process::from_pid(pid);
if (!process) if (!process)
return -ESRCH; return -ESRCH;
if (process != this && process->ppid() != m_pid) {
// The value of the pid argument does not match the process ID
// of the calling process or of a child process of the calling process.
return -ESRCH;
}
if (process->pid() == process->sid()) {
// The process indicated by the pid argument is a session leader.
return -EPERM;
}
if (process->ppid() == m_pid && process->sid() != sid()) {
// The value of the pid argument matches the process ID of a child
// process of the calling process and the child process is not in
// the same session as the calling process.
return -EPERM;
}
pid_t new_pgid = specified_pgid ? specified_pgid : process->m_pid; pid_t new_pgid = specified_pgid ? specified_pgid : process->m_pid;
pid_t current_sid = get_sid_from_pgid(process->m_pgid); pid_t current_sid = get_sid_from_pgid(process->m_pgid);
pid_t new_sid = get_sid_from_pgid(new_pgid); pid_t new_sid = get_sid_from_pgid(new_pgid);