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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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4
Kernel/Tasks/Thread.h
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@ -884,7 +884,6 @@ public:
u32 pending_signals() const;
u32 pending_signals_for_state() const;
[[nodiscard]] bool has_alternative_signal_stack() const;
[[nodiscard]] bool is_in_alternative_signal_stack() const;
FPUState& fpu_state() { return m_fpu_state; }
@ -1177,8 +1176,7 @@ private:
u32 m_pending_signals { 0 };
u8 m_currently_handled_signal { 0 };
u32 m_signal_mask { 0 };
FlatPtr m_alternative_signal_stack { 0 };
FlatPtr m_alternative_signal_stack_size { 0 };
Optional<Memory::VirtualRange> m_alternative_signal_stack;
SignalBlockerSet m_signal_blocker_set;
FlatPtr m_kernel_stack_base { 0 };
FlatPtr m_kernel_stack_top { 0 };