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Kernel: Release scheduler_lock in ptrace once we know tracee is stopped

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This fixes a kernel crash that occured when calling ptrace with PT_PEEK
on non paged-in memory.
The crash occurred because we were holding the scheduler lock while
trying to read from the disk's block device, which we do not allow.
Fixes #4740
This commit is contained in:
Itamar 2021-01-02 12:03:28 +02:00 • committed by Andreas Kling
parent a50583ade1
commit df5ea97c51
Notes: sideshowbarker 2024-07-19 00:12:28 +09:00
1 changed files with 2 additions and 0 deletions
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2
Kernel/Ptrace.cpp
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@ -86,6 +86,8 @@ KResultOr<u32> handle_syscall(const Kernel::Syscall::SC_ptrace_params& params, P
if (peer->state() == Thread::State::Running)
return KResult(-EBUSY);
scheduler_lock.unlock();
switch (params.request) {
case PT_CONTINUE:
peer->send_signal(SIGCONT, &caller);