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ptrace: Provide set/get interface for syscall user dispatch

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The syscall user dispatch configuration can only be set by the task itself,
but lacks a ptrace set/get interface which makes it impossible to implement
checkpoint/restore for it.

Add the required ptrace requests and the get/set functions in the syscall
user dispatch code to make that possible.

Signed-off-by: Gregory Price <gregory.price@memverge.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Oleg Nesterov <oleg@redhat.com>
Link: https://lore.kernel.org/r/20230407171834.3558-4-gregory.price@memverge.com
This commit is contained in:
Gregory Price
2023-04-07 13:18:33 -04:00
committed by Thomas Gleixner
parent 463b7715e7
commit 3f67987cdc
5 changed files with 101 additions and 0 deletions
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18
include/linux/syscall_user_dispatch.h
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@@ -22,6 +22,12 @@ int set_syscall_user_dispatch(unsigned long mode, unsigned long offset,
#define clear_syscall_work_syscall_user_dispatch(tsk) \
clear_task_syscall_work(tsk, SYSCALL_USER_DISPATCH)
int syscall_user_dispatch_get_config(struct task_struct *task, unsigned long size,
void __user *data);
int syscall_user_dispatch_set_config(struct task_struct *task, unsigned long size,
void __user *data);
#else
struct syscall_user_dispatch {};
@@ -35,6 +41,18 @@ static inline void clear_syscall_work_syscall_user_dispatch(struct task_struct *
{
}
static inline int syscall_user_dispatch_get_config(struct task_struct *task,
unsigned long size, void __user *data)
{
return -EINVAL;
}
static inline int syscall_user_dispatch_set_config(struct task_struct *task,
unsigned long size, void __user *data)
{
return -EINVAL;
}
#endif /* CONFIG_GENERIC_ENTRY */
#endif /* _SYSCALL_USER_DISPATCH_H */