Re: [PATCH v8 1/1] ptrace,syscall_user_dispatch: checkpoint/restore support for SUD
From: Andrei Vagin <hidden>
Date: 2023-02-09 20:29:54
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On Tue, Jan 31, 2023 at 7:30 AM Gregory Price [off-list ref] wrote:
Implement ptrace getter/setter interface for syscall user dispatch. These prctl settings are presently write-only, making it impossible to implement transparent checkpoint/restore via software like CRIU. 'on_dispatch' field is not exposed because it is a kernel-internal only field that cannot be 'true' when returning to userland.
Acked-by: Andrei Vagin <redacted>
Signed-off-by: Gregory Price <redacted>
<snip>
quoted hunk ↗ jump to hunk
diff --git a/include/uapi/linux/ptrace.h b/include/uapi/linux/ptrace.h index 195ae64a8c87..6d2f3b86f932 100644 --- a/include/uapi/linux/ptrace.h +++ b/include/uapi/linux/ptrace.h@@ -112,6 +112,15 @@ struct ptrace_rseq_configuration { __u32 pad; }; +#define PTRACE_SET_SYSCALL_USER_DISPATCH_CONFIG 0x4210 +#define PTRACE_GET_SYSCALL_USER_DISPATCH_CONFIG 0x4211 +struct syscall_user_dispatch_config {
nit: all structures in this header have the ptrace prefix. I think it is better to add it to this one too.
+ __u64 mode; + __s8 *selector; + __u64 offset; + __u64 len; +}; + /* * These values are stored in task->ptrace_message * by ptrace_stop to describe the current syscall-stop.