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task_stack: Fix end_of_stack() for architectures with upwards-growing stack
[ Upstream commit 9cc2fa4f4a
]
The function end_of_stack() returns a pointer to the last entry of a
stack. For architectures like parisc where the stack grows upwards
return the pointer to the highest address in the stack.
Without this change I faced a crash on parisc, because the stackleak
functionality wrote STACKLEAK_POISON to the lowest address and thus
overwrote the first 4 bytes of the task_struct which included the
TIF_FLAGS.
Signed-off-by: Helge Deller <deller@gmx.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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1 changed files with 4 additions and 0 deletions
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@ -25,7 +25,11 @@ static inline void *task_stack_page(const struct task_struct *task)
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static inline unsigned long *end_of_stack(const struct task_struct *task)
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{
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#ifdef CONFIG_STACK_GROWSUP
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return (unsigned long *)((unsigned long)task->stack + THREAD_SIZE) - 1;
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#else
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return task->stack;
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#endif
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}
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#elif !defined(__HAVE_THREAD_FUNCTIONS)
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