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Kernel: Only allow sending signals to process you own.

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This commit is contained in:
Andreas Kling 2019-02-28 11:45:45 +01:00
parent 05f9257621
commit c09ab7cc40
Notes: sideshowbarker 2024-07-19 15:35:59 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/c09ab7cc40f
2 changed files with 15 additions and 6 deletions
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17
Kernel/Process.cpp
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@ -1411,6 +1411,8 @@ int Process::sys$isatty(int fd)
int Process::sys$kill(pid_t pid, int signal)
{
if (signal < 0 || signal >= 32)
return -EINVAL;
if (pid == 0) {
// FIXME: Send to same-group processes.
ASSERT(pid != 0);
@ -1424,13 +1426,18 @@ int Process::sys$kill(pid_t pid, int signal)
Scheduler::yield();
return 0;
}
Process* peer = nullptr;
{
InterruptDisabler disabler;
peer = Process::from_pid(pid);
}
InterruptDisabler disabler;
auto* peer = Process::from_pid(pid);
if (!peer)
return -ESRCH;
// FIXME: Allow sending SIGCONT to everyone in the process group.
// FIXME: Should setuid processes have some special treatment here?
if (!is_superuser() && m_euid != peer->m_uid && m_uid != peer->m_uid)
return -EPERM;
if (peer->is_ring0() && signal == SIGKILL) {
kprintf("%s(%u) attempted to send SIGKILL to ring 0 process %s(%u)\n", name().characters(), m_pid, peer->name().characters(), peer->pid());
return -EPERM;
}
peer->send_signal(signal, this);
return 0;
}

4
Userland/kill.cpp
View file

@ -52,7 +52,9 @@ int main(int argc, char** argv)
return 3;
}
kill((pid_t)pid, signum);
int rc = kill((pid_t)pid, signum);
if (rc < 0)
perror("kill");
return 0;
}