Commit 032d82d9 authored by Roland McGrath's avatar Roland McGrath Committed by Ingo Molnar
Browse files

x86: compat_ptrace_request 



This adds a compat_ptrace_request that is the analogue of ptrace_request
for the things that 32-on-64 ptrace implementations can share in common.
So far there are just a couple of requests handled generically.

Signed-off-by: default avatarRoland McGrath <roland@redhat.com>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 16c3e389

include/linux/compat.h

+4 −0
Original line number Diff line number Diff line
@@ -243,6 +243,10 @@ asmlinkage long compat_sys_migrate_pages(compat_pid_t pid, 
		compat_ulong_t maxnode, const compat_ulong_t __user *old_nodes,

		const compat_ulong_t __user *new_nodes);



extern int compat_ptrace_request(struct task_struct *child,

				 compat_long_t request,

				 compat_ulong_t addr, compat_ulong_t data);



/*

 * epoll (fs/eventpoll.c) compat bits follow ...

 */

kernel/ptrace.c

+38 −0
Original line number Diff line number Diff line
@@ -607,3 +607,41 @@ int generic_ptrace_pokedata(struct task_struct *tsk, long addr, long data) 
	copied = access_process_vm(tsk, addr, &data, sizeof(data), 1);

	return (copied == sizeof(data)) ? 0 : -EIO;

}



#ifdef CONFIG_COMPAT

#include <linux/compat.h>



int compat_ptrace_request(struct task_struct *child, compat_long_t request,

			  compat_ulong_t addr, compat_ulong_t data)

{

	compat_ulong_t __user *datap = compat_ptr(data);

	compat_ulong_t word;

	int ret;



	switch (request) {

	case PTRACE_PEEKTEXT:

	case PTRACE_PEEKDATA:

		ret = access_process_vm(child, addr, &word, sizeof(word), 0);

		if (ret != sizeof(word))

			ret = -EIO;

		else

			ret = put_user(word, datap);

		break;



	case PTRACE_POKETEXT:

	case PTRACE_POKEDATA:

		ret = access_process_vm(child, addr, &data, sizeof(data), 1);

		ret = (ret != sizeof(data) ? -EIO : 0);

		break;



	case PTRACE_GETEVENTMSG:

		ret = put_user((compat_ulong_t) child->ptrace_message, datap);

		break;



	default:

		ret = ptrace_request(child, request, addr, data);

	}



	return ret;

}

#endif	/* CONFIG_COMPAT */

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