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Kernel: Shrink instead of expand sigaltstack range to page boundaries

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Since the POSIX sigaltstack manpage suggests allocating the stack
region using malloc(), and many heap implementations (including ours)
store heap chunk metadata in memory just before the vended pointer,
we would end up zeroing the metadata, leading to various crashes.
This commit is contained in:
Idan Horowitz 2023-12-24 15:53:16 +02:00 • committed by Andreas Kling
parent 4c6fd454d0
commit a49b7e92eb
5 changed files with 29 additions and 34 deletions
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Kernel/Syscalls/fork.cpp
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@ -117,7 +117,6 @@ ErrorOr<FlatPtr> Process::sys$fork(RegisterState& regs)
// A child process created via fork(2) inherits a copy of its parent's alternate signal stack settings.
child_first_thread->m_alternative_signal_stack = Thread::current()->m_alternative_signal_stack;
child_first_thread->m_alternative_signal_stack_size = Thread::current()->m_alternative_signal_stack_size;
auto& child_regs = child_first_thread->m_regs;
#if ARCH(X86_64)