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Kernel: Prevent execve/ptrace race

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Add a per-process ptrace lock and use it to prevent ptrace access to a
process after it decides to commit to a new executable in sys$execve().

Fixes #5230.
This commit is contained in:
Andreas Kling 2021-02-08 23:01:53 +01:00
parent 4b7b92c201
commit 4ff0f971f7
3 changed files with 8 additions and 4 deletions
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3
Kernel/Syscalls/execve.cpp
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@ -483,6 +483,9 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
// We commit to the new executable at this point. There is no turning back!
// Prevent other processes from attaching to us with ptrace while we're doing this.
Locker ptrace_locker(ptrace_lock());
// Disable profiling temporarily in case it's running on this process.
TemporaryChange profiling_disabler(m_profiling, false);