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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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9
kernel/ptrace.c
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@@ -32,6 +32,7 @@
#include <linux/compat.h>
#include <linux/sched/signal.h>
#include <linux/minmax.h>
#include <linux/syscall_user_dispatch.h>
#include <asm/syscall.h> /* for syscall_get_* */
@@ -1259,6 +1260,14 @@ int ptrace_request(struct task_struct *child, long request,
break;
#endif
case PTRACE_SET_SYSCALL_USER_DISPATCH_CONFIG:
ret = syscall_user_dispatch_set_config(child, addr, datavp);
break;
case PTRACE_GET_SYSCALL_USER_DISPATCH_CONFIG:
ret = syscall_user_dispatch_get_config(child, addr, datavp);
break;
default:
break;
}