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fork: Duplicate task_struct before stack allocation

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alloc_thread_stack_node() already populates the task_struct::stack
member except on IA64. The stack pointer is saved and populated again
because IA64 needs it and arch_dup_task_struct() overwrites it.

Allocate thread's stack after task_struct has been duplicated as a
preparation for further changes.

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Andy Lutomirski <luto@kernel.org>
Link: https://lore.kernel.org/r/20220217102406.3697941-3-bigeasy@linutronix.de
This commit is contained in:
Sebastian Andrzej Siewior 2022-02-17 11:24:00 +01:00 committed by Thomas Gleixner
parent be9a2277ca
commit 546c42b2c5
1 changed files with 4 additions and 5 deletions
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9
kernel/fork.c
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@ -888,6 +888,10 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
if (!tsk)
return NULL;
err = arch_dup_task_struct(tsk, orig);
if (err)
goto free_tsk;
stack = alloc_thread_stack_node(tsk, node);
if (!stack)
goto free_tsk;
@ -897,8 +901,6 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
stack_vm_area = task_stack_vm_area(tsk);
err = arch_dup_task_struct(tsk, orig);
/*
* arch_dup_task_struct() clobbers the stack-related fields. Make
* sure they're properly initialized before using any stack-related
@ -912,9 +914,6 @@ static struct task_struct *dup_task_struct(struct task_struct *orig, int node)
refcount_set(&tsk->stack_refcount, 1);
#endif
if (err)
goto free_stack;
err = scs_prepare(tsk, node);
if (err)
goto free_stack;