From 3f67987cdc09778e75098f9f5168832f8f8e1f1c Mon Sep 17 00:00:00 2001 From: Gregory Price Date: Fri, 7 Apr 2023 13:18:33 -0400 Subject: ptrace: Provide set/get interface for syscall user dispatch 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 Signed-off-by: Thomas Gleixner Reviewed-by: Oleg Nesterov Link: https://lore.kernel.org/r/20230407171834.3558-4-gregory.price@memverge.com --- include/uapi/linux/ptrace.h | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) (limited to 'include/uapi/linux/ptrace.h') diff --git a/include/uapi/linux/ptrace.h b/include/uapi/linux/ptrace.h index 195ae64a8c87..72c038fc71d0 100644 --- a/include/uapi/linux/ptrace.h +++ b/include/uapi/linux/ptrace.h @@ -112,6 +112,36 @@ struct ptrace_rseq_configuration { __u32 pad; }; +#define PTRACE_SET_SYSCALL_USER_DISPATCH_CONFIG 0x4210 +#define PTRACE_GET_SYSCALL_USER_DISPATCH_CONFIG 0x4211 + +/* + * struct ptrace_sud_config - Per-task configuration for Syscall User Dispatch + * @mode: One of PR_SYS_DISPATCH_ON or PR_SYS_DISPATCH_OFF + * @selector: Tracees user virtual address of SUD selector + * @offset: SUD exclusion area (virtual address) + * @len: Length of SUD exclusion area + * + * Used to get/set the syscall user dispatch configuration for a tracee. + * Selector is optional (may be NULL), and if invalid will produce + * a SIGSEGV in the tracee upon first access. + * + * If mode is PR_SYS_DISPATCH_ON, syscall dispatch will be enabled. If + * PR_SYS_DISPATCH_OFF, syscall dispatch will be disabled and all other + * parameters must be 0. The value in *selector (if not null), also determines + * whether syscall dispatch will occur. + * + * The Syscall User Dispatch Exclusion area described by offset/len is the + * virtual address space from which syscalls will not produce a user + * dispatch. + */ +struct ptrace_sud_config { + __u64 mode; + __u64 selector; + __u64 offset; + __u64 len; +}; + /* * These values are stored in task->ptrace_message * by ptrace_stop to describe the current syscall-stop. -- cgit v1.2.3-70-g09d2