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Kernel: Preserve signal mask across fork(2) and execve(2)

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A child created via fork(2) inherits a copy of its parent's signal
mask; the signal mask is preserved across execve(2).
This commit is contained in:
Idan Horowitz 2021-12-11 17:18:39 +02:00
parent 0301180f88
commit 92a6c91f4e
3 changed files with 5 additions and 2 deletions
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3
Kernel/Syscalls/fork.cpp
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@ -43,6 +43,9 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
dbgln_if(FORK_DEBUG, "fork: child={}", child);
child->address_space().set_enforces_syscall_regions(address_space().enforces_syscall_regions());
// A child created via fork(2) inherits a copy of its parent's signal mask
child_first_thread->update_signal_mask(Thread::current()->signal_mask());
#if ARCH(I386)
auto& child_regs = child_first_thread->m_regs;
child_regs.eax = 0; // fork() returns 0 in the child :^)